view3d_edit.c

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2008 Blender Foundation.
 * All rights reserved.
 *
 *
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <string.h>
#include <stdio.h>
#include <math.h>
#include <float.h>

#include "DNA_armature_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "DNA_camera_types.h"
#include "DNA_lamp_types.h"

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_rand.h"
#include "BLI_utildefines.h"

#include "BKE_camera.h"
#include "BKE_context.h"
#include "BKE_image.h"
#include "BKE_library.h"
#include "BKE_object.h"
#include "BKE_paint.h"
#include "BKE_report.h"
#include "BKE_scene.h"
#include "BKE_screen.h"
#include "BKE_depsgraph.h" /* for ED_view3d_camera_lock_sync */


#include "BIF_gl.h"
#include "BIF_glutil.h"

#include "WM_api.h"
#include "WM_types.h"

#include "RNA_access.h"
#include "RNA_define.h"

#include "ED_particle.h"
#include "ED_screen.h"
#include "ED_transform.h"
#include "ED_mesh.h"
#include "ED_view3d.h"


#include "PIL_time.h" /* smoothview */

#include "view3d_intern.h"  // own include

/* ********************** view3d_edit: view manipulations ********************* */

int ED_view3d_camera_lock_check(View3D *v3d, RegionView3D *rv3d)
{
    return ((v3d->camera) &&
            (v3d->camera->id.lib == NULL) &&
            (v3d->flag2 & V3D_LOCK_CAMERA) &&
            (rv3d->persp==RV3D_CAMOB));
}

void ED_view3d_camera_lock_init(View3D *v3d, RegionView3D *rv3d)
{
    if(ED_view3d_camera_lock_check(v3d, rv3d)) {
        ED_view3d_from_object(v3d->camera, rv3d->ofs, rv3d->viewquat, &rv3d->dist, NULL);
    }
}

/* return TRUE if the camera is moved */
int ED_view3d_camera_lock_sync(View3D *v3d, RegionView3D *rv3d)
{
    if(ED_view3d_camera_lock_check(v3d, rv3d)) {
        ObjectTfmProtectedChannels obtfm;
        Object *root_parent;

        if((U.uiflag & USER_CAM_LOCK_NO_PARENT)==0 && (root_parent= v3d->camera->parent)) {
            Object *ob_update;
            float view_mat[4][4];
            float diff_mat[4][4];
            float parent_mat[4][4];

            while(root_parent->parent) {
                root_parent= root_parent->parent;
            }

            ED_view3d_to_m4(view_mat, rv3d->ofs, rv3d->viewquat, rv3d->dist);

            invert_m4_m4(v3d->camera->imat, v3d->camera->obmat);
            mult_m4_m4m4(diff_mat, view_mat, v3d->camera->imat);

            mult_m4_m4m4(parent_mat, diff_mat, root_parent->obmat);

            object_tfm_protected_backup(root_parent, &obtfm);
            object_apply_mat4(root_parent, parent_mat, TRUE, FALSE);
            object_tfm_protected_restore(root_parent, &obtfm, root_parent->protectflag);

            ob_update= v3d->camera;
            while(ob_update) {
                DAG_id_tag_update(&ob_update->id, OB_RECALC_OB);
                WM_main_add_notifier(NC_OBJECT|ND_TRANSFORM, ob_update);
                ob_update= ob_update->parent;
            }
        }
        else {
            object_tfm_protected_backup(v3d->camera, &obtfm);
            ED_view3d_to_object(v3d->camera, rv3d->ofs, rv3d->viewquat, rv3d->dist);
            object_tfm_protected_restore(v3d->camera, &obtfm, v3d->camera->protectflag);

            DAG_id_tag_update(&v3d->camera->id, OB_RECALC_OB);
            WM_main_add_notifier(NC_OBJECT|ND_TRANSFORM, v3d->camera);
        }

        return TRUE;
    }
    else {
        return FALSE;
    }
}


/* ********************* box view support ***************** */

static void view3d_boxview_clip(ScrArea *sa)
{
    ARegion *ar;
    BoundBox *bb = MEM_callocN(sizeof(BoundBox), "clipbb");
    float clip[6][4];
    float x1= 0.0f, y1= 0.0f, z1= 0.0f, ofs[3] = {0.0f, 0.0f, 0.0f};
    int val;

    /* create bounding box */
    for(ar= sa->regionbase.first; ar; ar= ar->next) {
        if(ar->regiontype==RGN_TYPE_WINDOW) {
            RegionView3D *rv3d= ar->regiondata;

            if(rv3d->viewlock & RV3D_BOXCLIP) {
                if(ELEM(rv3d->view, RV3D_VIEW_TOP, RV3D_VIEW_BOTTOM)) {
                    if(ar->winx>ar->winy) x1= rv3d->dist;
                    else x1= ar->winx*rv3d->dist/ar->winy;

                    if(ar->winx>ar->winy) y1= ar->winy*rv3d->dist/ar->winx;
                    else y1= rv3d->dist;
                    copy_v2_v2(ofs, rv3d->ofs);
                }
                else if(ELEM(rv3d->view, RV3D_VIEW_FRONT, RV3D_VIEW_BACK)) {
                    ofs[2]= rv3d->ofs[2];

                    if(ar->winx>ar->winy) z1= ar->winy*rv3d->dist/ar->winx;
                    else z1= rv3d->dist;
                }
            }
        }
    }

    for(val=0; val<8; val++) {
        if(ELEM4(val, 0, 3, 4, 7))
            bb->vec[val][0]= -x1 - ofs[0];
        else
            bb->vec[val][0]=  x1 - ofs[0];

        if(ELEM4(val, 0, 1, 4, 5))
            bb->vec[val][1]= -y1 - ofs[1];
        else
            bb->vec[val][1]=  y1 - ofs[1];

        if(val > 3)
            bb->vec[val][2]= -z1 - ofs[2];
        else
            bb->vec[val][2]=  z1 - ofs[2];
    }

    /* normals for plane equations */
    normal_tri_v3( clip[0],bb->vec[0], bb->vec[1], bb->vec[4]);
    normal_tri_v3( clip[1],bb->vec[1], bb->vec[2], bb->vec[5]);
    normal_tri_v3( clip[2],bb->vec[2], bb->vec[3], bb->vec[6]);
    normal_tri_v3( clip[3],bb->vec[3], bb->vec[0], bb->vec[7]);
    normal_tri_v3( clip[4],bb->vec[4], bb->vec[5], bb->vec[6]);
    normal_tri_v3( clip[5],bb->vec[0], bb->vec[2], bb->vec[1]);

    /* then plane equations */
    for(val=0; val<5; val++) {
        clip[val][3]= - clip[val][0]*bb->vec[val][0] - clip[val][1]*bb->vec[val][1] - clip[val][2]*bb->vec[val][2];
    }
    clip[5][3]= - clip[5][0]*bb->vec[0][0] - clip[5][1]*bb->vec[0][1] - clip[5][2]*bb->vec[0][2];

    /* create bounding box */
    for(ar= sa->regionbase.first; ar; ar= ar->next) {
        if(ar->regiontype==RGN_TYPE_WINDOW) {
            RegionView3D *rv3d= ar->regiondata;

            if(rv3d->viewlock & RV3D_BOXCLIP) {
                rv3d->rflag |= RV3D_CLIPPING;
                memcpy(rv3d->clip, clip, sizeof(clip));
                if(rv3d->clipbb) MEM_freeN(rv3d->clipbb);
                rv3d->clipbb= MEM_dupallocN(bb);
            }
        }
    }
    MEM_freeN(bb);
}

/* sync center/zoom view of region to others, for view transforms */
static void view3d_boxview_sync(ScrArea *sa, ARegion *ar)
{
    ARegion *artest;
    RegionView3D *rv3d= ar->regiondata;
    short clip= 0;

    for(artest= sa->regionbase.first; artest; artest= artest->next) {
        if(artest!=ar && artest->regiontype==RGN_TYPE_WINDOW) {
            RegionView3D *rv3dtest= artest->regiondata;

            if(rv3dtest->viewlock) {
                rv3dtest->dist= rv3d->dist;

                if( ELEM(rv3d->view, RV3D_VIEW_TOP, RV3D_VIEW_BOTTOM) ) {
                    if( ELEM(rv3dtest->view, RV3D_VIEW_FRONT, RV3D_VIEW_BACK))
                        rv3dtest->ofs[0]= rv3d->ofs[0];
                    else if( ELEM(rv3dtest->view, RV3D_VIEW_RIGHT, RV3D_VIEW_LEFT))
                        rv3dtest->ofs[1]= rv3d->ofs[1];
                }
                else if( ELEM(rv3d->view, RV3D_VIEW_FRONT, RV3D_VIEW_BACK) ) {
                    if( ELEM(rv3dtest->view, RV3D_VIEW_TOP, RV3D_VIEW_BOTTOM))
                        rv3dtest->ofs[0]= rv3d->ofs[0];
                    else if( ELEM(rv3dtest->view, RV3D_VIEW_RIGHT, RV3D_VIEW_LEFT))
                        rv3dtest->ofs[2]= rv3d->ofs[2];
                }
                else if( ELEM(rv3d->view, RV3D_VIEW_RIGHT, RV3D_VIEW_LEFT) ) {
                    if( ELEM(rv3dtest->view, RV3D_VIEW_TOP, RV3D_VIEW_BOTTOM))
                        rv3dtest->ofs[1]= rv3d->ofs[1];
                    if( ELEM(rv3dtest->view, RV3D_VIEW_FRONT, RV3D_VIEW_BACK))
                        rv3dtest->ofs[2]= rv3d->ofs[2];
                }

                clip |= rv3dtest->viewlock & RV3D_BOXCLIP;

                ED_region_tag_redraw(artest);
            }
        }
    }

    if(clip) {
        view3d_boxview_clip(sa);
    }
}

/* for home, center etc */
void view3d_boxview_copy(ScrArea *sa, ARegion *ar)
{
    ARegion *artest;
    RegionView3D *rv3d= ar->regiondata;
    short clip= 0;

    for(artest= sa->regionbase.first; artest; artest= artest->next) {
        if(artest!=ar && artest->regiontype==RGN_TYPE_WINDOW) {
            RegionView3D *rv3dtest= artest->regiondata;

            if(rv3dtest->viewlock) {
                rv3dtest->dist= rv3d->dist;
                copy_v3_v3(rv3dtest->ofs, rv3d->ofs);
                ED_region_tag_redraw(artest);

                clip |= rv3dtest->viewlock & RV3D_BOXCLIP;
            }
        }
    }

    if(clip) {
        view3d_boxview_clip(sa);
    }
}

/* 'clip' is used to know if our clip setting has changed */
void ED_view3d_quadview_update(ScrArea *sa, ARegion *ar, short do_clip)
{
    ARegion *arsync= NULL;
    RegionView3D *rv3d= ar->regiondata;
    short viewlock;
    /* this function copies flags from the first of the 3 other quadview
       regions to the 2 other, so it assumes this is the region whose
       properties are always being edited, weak */
    viewlock= rv3d->viewlock;

    if((viewlock & RV3D_LOCKED)==0)
        viewlock= 0;
    else if((viewlock & RV3D_BOXVIEW)==0) {
        viewlock &= ~RV3D_BOXCLIP;
        do_clip= TRUE;
    }

    for(; ar; ar= ar->prev) {
        if(ar->alignment==RGN_ALIGN_QSPLIT) {
            rv3d= ar->regiondata;
            rv3d->viewlock= viewlock;

            if(do_clip && (viewlock & RV3D_BOXCLIP)==0) {
                rv3d->rflag &= ~RV3D_BOXCLIP;
            }

            /* use arsync so we sync with one of the aligned views below
             * else the view jumps on changing view settings like 'clip'
             * since it copies from the perspective view */
            arsync= ar;
        }
    }

    if(rv3d->viewlock & RV3D_BOXVIEW) {
        view3d_boxview_copy(sa, arsync ? arsync : sa->regionbase.last);
    }

    ED_area_tag_redraw(sa);
}

/* ************************** init for view ops **********************************/

typedef struct ViewOpsData {
    ScrArea *sa;
    ARegion *ar;
    View3D *v3d;
    RegionView3D *rv3d;

    /* needed for continuous zoom */
    wmTimer *timer;
    double timer_lastdraw;

    float oldquat[4];
    float viewquat[4]; /* working copy of rv3d->viewquat */
    float trackvec[3];
    float mousevec[3]; /* dolly only */
    float reverse, dist0;
    float grid, far;
    short axis_snap; /* view rotate only */

    /* use for orbit selection and auto-dist */
    float ofs[3], dyn_ofs[3];
    short use_dyn_ofs;

    int origx, origy, oldx, oldy;
    int origkey; /* the key that triggered the operator */

} ViewOpsData;

#define TRACKBALLSIZE  (1.1)

static void calctrackballvec(rcti *rect, int mx, int my, float *vec)
{
    float x, y, radius, d, z, t;

    radius= TRACKBALLSIZE;

    /* normalize x and y */
    x= (rect->xmax + rect->xmin)/2 - mx;
    x/= (float)((rect->xmax - rect->xmin)/4);
    y= (rect->ymax + rect->ymin)/2 - my;
    y/= (float)((rect->ymax - rect->ymin)/2);

    d = sqrt(x*x + y*y);
    if (d < radius * (float)M_SQRT1_2) { /* Inside sphere */
        z= sqrt(radius*radius - d*d);
    }
    else { /* On hyperbola */
        t= radius / (float)M_SQRT2;
        z= t*t / d;
    }

    vec[0]= x;
    vec[1]= y;
    vec[2]= -z;     /* yah yah! */
}


static void viewops_data_create(bContext *C, wmOperator *op, wmEvent *event)
{
    static float lastofs[3] = {0,0,0};
    RegionView3D *rv3d;
    ViewOpsData *vod= MEM_callocN(sizeof(ViewOpsData), "viewops data");

    /* store data */
    op->customdata= vod;
    vod->sa= CTX_wm_area(C);
    vod->ar= CTX_wm_region(C);
    vod->v3d= vod->sa->spacedata.first;
    vod->rv3d= rv3d= vod->ar->regiondata;

    /* set the view from the camera, if view locking is enabled.
     * we may want to make this optional but for now its needed always */
    ED_view3d_camera_lock_init(vod->v3d, vod->rv3d);

    vod->dist0= rv3d->dist;
    copy_qt_qt(vod->viewquat, rv3d->viewquat);
    copy_qt_qt(vod->oldquat, rv3d->viewquat);
    vod->origx= vod->oldx= event->x;
    vod->origy= vod->oldy= event->y;
    vod->origkey= event->type; /* the key that triggered the operator.  */
    vod->use_dyn_ofs= (U.uiflag & USER_ORBIT_SELECTION) ? 1:0;
    copy_v3_v3(vod->ofs, rv3d->ofs);

    if (vod->use_dyn_ofs) {
        /* If there's no selection, lastofs is unmodified and last value since static */
        calculateTransformCenter(C, V3D_CENTROID, lastofs);
        negate_v3_v3(vod->dyn_ofs, lastofs);
    }
    else if (U.uiflag & USER_ORBIT_ZBUF) {

        view3d_operator_needs_opengl(C); /* needed for zbuf drawing */

        if((vod->use_dyn_ofs=ED_view3d_autodist(CTX_data_scene(C), vod->ar, vod->v3d, event->mval, vod->dyn_ofs))) {
            if (rv3d->is_persp) {
                float my_origin[3]; /* original G.vd->ofs */
                float my_pivot[3]; /* view */
                float dvec[3];

                // locals for dist correction
                float mat[3][3];
                float upvec[3];

                negate_v3_v3(my_origin, rv3d->ofs);             /* ofs is flipped */

                /* Set the dist value to be the distance from this 3d point */
                /* this means youll always be able to zoom into it and panning wont go bad when dist was zero */

                /* remove dist value */
                upvec[0] = upvec[1] = 0;
                upvec[2] = rv3d->dist;
                copy_m3_m4(mat, rv3d->viewinv);

                mul_m3_v3(mat, upvec);
                sub_v3_v3v3(my_pivot, rv3d->ofs, upvec);
                negate_v3(my_pivot);                /* ofs is flipped */

                /* find a new ofs value that is along the view axis (rather than the mouse location) */
                closest_to_line_v3(dvec, vod->dyn_ofs, my_pivot, my_origin);
                vod->dist0 = rv3d->dist = len_v3v3(my_pivot, dvec);

                negate_v3_v3(rv3d->ofs, dvec);
            }
            negate_v3(vod->dyn_ofs);
            copy_v3_v3(vod->ofs, rv3d->ofs);
        }
    }

    {
        /* for dolly */
        float mval_f[2];
        VECCOPY2D(mval_f, event->mval);
        ED_view3d_win_to_vector(vod->ar, mval_f, vod->mousevec);
    }

    /* lookup, we dont pass on v3d to prevent confusement */
    vod->grid= vod->v3d->grid;
    vod->far= vod->v3d->far;

    calctrackballvec(&vod->ar->winrct, event->x, event->y, vod->trackvec);

    initgrabz(rv3d, -rv3d->ofs[0], -rv3d->ofs[1], -rv3d->ofs[2]);

    vod->reverse= 1.0f;
    if (rv3d->persmat[2][1] < 0.0f)
        vod->reverse= -1.0f;

    rv3d->rflag |= RV3D_NAVIGATING;
}

static void viewops_data_free(bContext *C, wmOperator *op)
{
    ARegion *ar;
    Paint *p = paint_get_active(CTX_data_scene(C));

    if(op->customdata) {
        ViewOpsData *vod= op->customdata;
        ar= vod->ar;
        vod->rv3d->rflag &= ~RV3D_NAVIGATING;

        if(vod->timer)
            WM_event_remove_timer(CTX_wm_manager(C), vod->timer->win, vod->timer);

        MEM_freeN(vod);
        op->customdata= NULL;
    }
    else {
        ar= CTX_wm_region(C);
    }

    if(p && (p->flags & PAINT_FAST_NAVIGATE))
        ED_region_tag_redraw(ar);
}

/* ************************** viewrotate **********************************/

static const float thres = 0.93f; //cos(20 deg);

#define COS45 0.70710678118654746
#define SIN45 COS45

static float snapquats[39][5] = {
    /*{q0, q1, q3, q4, view}*/
    {COS45, -SIN45, 0.0, 0.0, RV3D_VIEW_FRONT},  //front
    {0.0, 0.0, -SIN45, -SIN45, RV3D_VIEW_BACK}, //back
    {1.0, 0.0, 0.0, 0.0, RV3D_VIEW_TOP},       //top
    {0.0, -1.0, 0.0, 0.0, RV3D_VIEW_BOTTOM},      //bottom
    {0.5, -0.5, -0.5, -0.5, RV3D_VIEW_RIGHT},    //left
    {0.5, -0.5, 0.5, 0.5, RV3D_VIEW_LEFT},      //right

    /* some more 45 deg snaps */
    {0.65328145027160645, -0.65328145027160645, 0.27059805393218994, 0.27059805393218994, 0},
    {0.92387950420379639, 0.0, 0.0, 0.38268342614173889, 0},
    {0.0, -0.92387950420379639, 0.38268342614173889, 0.0, 0},
    {0.35355335474014282, -0.85355335474014282, 0.35355338454246521, 0.14644660055637360, 0},
    {0.85355335474014282, -0.35355335474014282, 0.14644660055637360, 0.35355338454246521, 0},
    {0.49999994039535522, -0.49999994039535522, 0.49999997019767761, 0.49999997019767761, 0},
    {0.27059802412986755, -0.65328145027160645, 0.65328145027160645, 0.27059802412986755, 0},
    {0.65328145027160645, -0.27059802412986755, 0.27059802412986755, 0.65328145027160645, 0},
    {0.27059799432754517, -0.27059799432754517, 0.65328139066696167, 0.65328139066696167, 0},
    {0.38268336653709412, 0.0, 0.0, 0.92387944459915161, 0},
    {0.0, -0.38268336653709412, 0.92387944459915161, 0.0, 0},
    {0.14644658565521240, -0.35355335474014282, 0.85355335474014282, 0.35355335474014282, 0},
    {0.35355335474014282, -0.14644658565521240, 0.35355335474014282, 0.85355335474014282, 0},
    {0.0, 0.0, 0.92387944459915161, 0.38268336653709412, 0},
    {-0.0, 0.0, 0.38268336653709412, 0.92387944459915161, 0},
    {-0.27059802412986755, 0.27059802412986755, 0.65328133106231689, 0.65328133106231689, 0},
    {-0.38268339633941650, 0.0, 0.0, 0.92387938499450684, 0},
    {0.0, 0.38268339633941650, 0.92387938499450684, 0.0, 0},
    {-0.14644658565521240, 0.35355338454246521, 0.85355329513549805, 0.35355332493782043, 0},
    {-0.35355338454246521, 0.14644658565521240, 0.35355332493782043, 0.85355329513549805, 0},
    {-0.49999991059303284, 0.49999991059303284, 0.49999985098838806, 0.49999985098838806, 0},
    {-0.27059799432754517, 0.65328145027160645, 0.65328139066696167, 0.27059799432754517, 0},
    {-0.65328145027160645, 0.27059799432754517, 0.27059799432754517, 0.65328139066696167, 0},
    {-0.65328133106231689, 0.65328133106231689, 0.27059793472290039, 0.27059793472290039, 0},
    {-0.92387932538986206, 0.0, 0.0, 0.38268333673477173, 0},
    {0.0, 0.92387932538986206, 0.38268333673477173, 0.0, 0},
    {-0.35355329513549805, 0.85355329513549805, 0.35355329513549805, 0.14644657075405121, 0},
    {-0.85355329513549805, 0.35355329513549805, 0.14644657075405121, 0.35355329513549805, 0},
    {-0.38268330693244934, 0.92387938499450684, 0.0, 0.0, 0},
    {-0.92387938499450684, 0.38268330693244934, 0.0, 0.0, 0},
    {-COS45, 0.0, 0.0, SIN45, 0},
    {COS45, 0.0, 0.0, SIN45, 0},
    {0.0, 0.0, 0.0, 1.0, 0}
};

enum {
    VIEW_PASS= 0,
    VIEW_APPLY,
    VIEW_CONFIRM
};

/* NOTE: these defines are saved in keymap files, do not change values but just add new ones */
#define VIEW_MODAL_CONFIRM              1 /* used for all view operations */
#define VIEWROT_MODAL_AXIS_SNAP_ENABLE  2
#define VIEWROT_MODAL_AXIS_SNAP_DISABLE 3
#define VIEWROT_MODAL_SWITCH_ZOOM       4
#define VIEWROT_MODAL_SWITCH_MOVE       5
#define VIEWROT_MODAL_SWITCH_ROTATE     6

/* called in transform_ops.c, on each regeneration of keymaps  */
void viewrotate_modal_keymap(wmKeyConfig *keyconf)
{
    static EnumPropertyItem modal_items[] = {
    {VIEW_MODAL_CONFIRM,    "CONFIRM", 0, "Confirm", ""},

    {VIEWROT_MODAL_AXIS_SNAP_ENABLE,    "AXIS_SNAP_ENABLE", 0, "Enable Axis Snap", ""},
    {VIEWROT_MODAL_AXIS_SNAP_DISABLE,   "AXIS_SNAP_DISABLE", 0, "Disable Axis Snap", ""},
        
    {VIEWROT_MODAL_SWITCH_ZOOM, "SWITCH_TO_ZOOM", 0, "Switch to Zoom"},
    {VIEWROT_MODAL_SWITCH_MOVE, "SWITCH_TO_MOVE", 0, "Switch to Move"},

    {0, NULL, 0, NULL, NULL}};

    wmKeyMap *keymap= WM_modalkeymap_get(keyconf, "View3D Rotate Modal");

    /* this function is called for each spacetype, only needs to add map once */
    if(keymap) return;

    keymap= WM_modalkeymap_add(keyconf, "View3D Rotate Modal", modal_items);

    /* items for modal map */
    WM_modalkeymap_add_item(keymap, MIDDLEMOUSE, KM_RELEASE, KM_ANY, 0, VIEW_MODAL_CONFIRM);
    WM_modalkeymap_add_item(keymap, ESCKEY, KM_PRESS, KM_ANY, 0, VIEW_MODAL_CONFIRM);

    WM_modalkeymap_add_item(keymap, LEFTALTKEY, KM_PRESS, KM_ANY, 0, VIEWROT_MODAL_AXIS_SNAP_ENABLE);
    WM_modalkeymap_add_item(keymap, LEFTALTKEY, KM_RELEASE, KM_ANY, 0, VIEWROT_MODAL_AXIS_SNAP_DISABLE);

    /* disabled mode switching for now, can re-implement better, later on
    WM_modalkeymap_add_item(keymap, LEFTMOUSE, KM_PRESS, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ZOOM);
    WM_modalkeymap_add_item(keymap, LEFTCTRLKEY, KM_PRESS, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ZOOM);
    WM_modalkeymap_add_item(keymap, LEFTSHIFTKEY, KM_PRESS, KM_ANY, 0, VIEWROT_MODAL_SWITCH_MOVE);
    */
    
    /* assign map to operators */
    WM_modalkeymap_assign(keymap, "VIEW3D_OT_rotate");

}

static void viewrotate_apply(ViewOpsData *vod, int x, int y)
{
    RegionView3D *rv3d= vod->rv3d;

    rv3d->view= RV3D_VIEW_USER; /* need to reset everytime because of view snapping */

    if (U.flag & USER_TRACKBALL) {
        float phi, si, q1[4], dvec[3], newvec[3];

        calctrackballvec(&vod->ar->winrct, x, y, newvec);

        sub_v3_v3v3(dvec, newvec, vod->trackvec);

        si= sqrt(dvec[0]*dvec[0]+ dvec[1]*dvec[1]+ dvec[2]*dvec[2]);
        si /= (float)(2.0 * TRACKBALLSIZE);

        cross_v3_v3v3(q1+1, vod->trackvec, newvec);
        normalize_v3(q1+1);

        /* Allow for rotation beyond the interval
            * [-pi, pi] */
        while (si > 1.0f)
            si -= 2.0f;

        /* This relation is used instead of
            * phi = asin(si) so that the angle
            * of rotation is linearly proportional
            * to the distance that the mouse is
            * dragged. */
        phi = si * (float)(M_PI / 2.0);

        q1[0]= cos(phi);
        mul_v3_fl(q1+1, sin(phi));
        mul_qt_qtqt(vod->viewquat, q1, vod->oldquat);

        if (vod->use_dyn_ofs) {
            /* compute the post multiplication quat, to rotate the offset correctly */
            copy_qt_qt(q1, vod->oldquat);
            conjugate_qt(q1);
            mul_qt_qtqt(q1, q1, vod->viewquat);

            conjugate_qt(q1); /* conj == inv for unit quat */
            copy_v3_v3(rv3d->ofs, vod->ofs);
            sub_v3_v3(rv3d->ofs, vod->dyn_ofs);
            mul_qt_v3(q1, rv3d->ofs);
            add_v3_v3(rv3d->ofs, vod->dyn_ofs);
        }
    }
    else {
        /* New turntable view code by John Aughey */
        float phi, q1[4];
        float m[3][3];
        float m_inv[3][3];
        float xvec[3] = {1.0f, 0.0f, 0.0f};
        /* Sensitivity will control how fast the viewport rotates.  0.0035 was
            obtained experimentally by looking at viewport rotation sensitivities
            on other modeling programs. */
        /* Perhaps this should be a configurable user parameter. */
        const float sensitivity = 0.0035f;

        /* Get the 3x3 matrix and its inverse from the quaternion */
        quat_to_mat3( m,vod->viewquat);
        invert_m3_m3(m_inv,m);

        /* Determine the direction of the x vector (for rotating up and down) */
        /* This can likely be computed directly from the quaternion. */
        mul_m3_v3(m_inv,xvec);

        /* Perform the up/down rotation */
        phi = sensitivity * -(y - vod->oldy);
        q1[0] = cos(phi);
        mul_v3_v3fl(q1+1, xvec, sin(phi));
        mul_qt_qtqt(vod->viewquat, vod->viewquat, q1);

        if (vod->use_dyn_ofs) {
            conjugate_qt(q1); /* conj == inv for unit quat */
            sub_v3_v3(rv3d->ofs, vod->dyn_ofs);
            mul_qt_v3(q1, rv3d->ofs);
            add_v3_v3(rv3d->ofs, vod->dyn_ofs);
        }

        /* Perform the orbital rotation */
        phi = sensitivity * vod->reverse * (x - vod->oldx);
        q1[0] = cos(phi);
        q1[1] = q1[2] = 0.0;
        q1[3] = sin(phi);
        mul_qt_qtqt(vod->viewquat, vod->viewquat, q1);

        if (vod->use_dyn_ofs) {
            conjugate_qt(q1);
            sub_v3_v3(rv3d->ofs, vod->dyn_ofs);
            mul_qt_v3(q1, rv3d->ofs);
            add_v3_v3(rv3d->ofs, vod->dyn_ofs);
        }
    }

    /* check for view snap */
    if (vod->axis_snap){
        int i;
        float viewquat_inv[4];
        float zaxis[3]={0,0,1};
        invert_qt_qt(viewquat_inv, vod->viewquat);

        mul_qt_v3(viewquat_inv, zaxis);

        for (i = 0 ; i < 39; i++){

            float view = (int)snapquats[i][4];
            float viewquat_inv_test[4];
            float zaxis_test[3]={0,0,1};

            invert_qt_qt(viewquat_inv_test, snapquats[i]);
            mul_qt_v3(viewquat_inv_test, zaxis_test);
            
            if(angle_v3v3(zaxis_test, zaxis) < DEG2RADF(45/3)) {
                /* find the best roll */
                float quat_roll[4], quat_final[4], quat_best[4];
                float viewquat_align[4]; /* viewquat aligned to zaxis_test */
                float viewquat_align_inv[4]; /* viewquat aligned to zaxis_test */
                float best_angle = FLT_MAX;
                int j;

                /* viewquat_align is the original viewquat aligned to the snapped axis
                 * for testing roll */
                rotation_between_vecs_to_quat(viewquat_align, zaxis_test, zaxis);
                normalize_qt(viewquat_align);
                mul_qt_qtqt(viewquat_align, vod->viewquat, viewquat_align);
                normalize_qt(viewquat_align);
                invert_qt_qt(viewquat_align_inv, viewquat_align);

                /* find best roll */
                for(j= 0; j<8; j++) {
                    float angle;
                    float xaxis1[3]={1,0,0};
                    float xaxis2[3]={1,0,0};
                    float quat_final_inv[4];

                    axis_angle_to_quat(quat_roll, zaxis_test, (float)j * DEG2RADF(45.0f));
                    normalize_qt(quat_roll);

                    mul_qt_qtqt(quat_final, snapquats[i], quat_roll);
                    normalize_qt(quat_final);
                    
                    /* compare 2 vector angles to find the least roll */
                    invert_qt_qt(quat_final_inv, quat_final);
                    mul_qt_v3(viewquat_align_inv, xaxis1);
                    mul_qt_v3(quat_final_inv, xaxis2);
                    angle= angle_v3v3(xaxis1, xaxis2);

                    if(angle <= best_angle) {
                        best_angle= angle;
                        copy_qt_qt(quat_best, quat_final);
                        if(j) view= 0; /* view grid assumes certain up axis */
                    }
                }

                copy_qt_qt(vod->viewquat, quat_best);
                rv3d->view= view; /* if we snap to a rolled camera the grid is invalid */

                break;
            }
        }
    }
    vod->oldx= x;
    vod->oldy= y;

    /* avoid precision loss over time */
    normalize_qt(vod->viewquat);

    /* use a working copy so view rotation locking doesnt overwrite the locked
     * rotation back into the view we calculate with */
    copy_qt_qt(rv3d->viewquat, vod->viewquat);

    ED_view3d_camera_lock_sync(vod->v3d, rv3d);

    ED_region_tag_redraw(vod->ar);
}

static int viewrotate_modal(bContext *C, wmOperator *op, wmEvent *event)
{
    ViewOpsData *vod= op->customdata;
    short event_code= VIEW_PASS;

    /* execute the events */
    if(event->type==MOUSEMOVE) {
        event_code= VIEW_APPLY;
    }
    else if(event->type==EVT_MODAL_MAP) {
        switch (event->val) {
            case VIEW_MODAL_CONFIRM:
                event_code= VIEW_CONFIRM;
                break;
            case VIEWROT_MODAL_AXIS_SNAP_ENABLE:
                vod->axis_snap= TRUE;
                event_code= VIEW_APPLY;
                break;
            case VIEWROT_MODAL_AXIS_SNAP_DISABLE:
                vod->axis_snap= FALSE;
                event_code= VIEW_APPLY;
                break;
            case VIEWROT_MODAL_SWITCH_ZOOM:
                WM_operator_name_call(C, "VIEW3D_OT_zoom", WM_OP_INVOKE_DEFAULT, NULL);
                event_code= VIEW_CONFIRM;
                break;
            case VIEWROT_MODAL_SWITCH_MOVE:
                WM_operator_name_call(C, "VIEW3D_OT_move", WM_OP_INVOKE_DEFAULT, NULL);
                event_code= VIEW_CONFIRM;
                break;
        }
    }
    else if(event->type==vod->origkey && event->val==KM_RELEASE) {
        event_code= VIEW_CONFIRM;
    }

    if(event_code==VIEW_APPLY) {
        viewrotate_apply(vod, event->x, event->y);
    }
    else if (event_code==VIEW_CONFIRM) {
        ED_view3d_depth_tag_update(vod->rv3d);
        viewops_data_free(C, op);

        return OPERATOR_FINISHED;
    }

    return OPERATOR_RUNNING_MODAL;
}

static int viewrotate_invoke(bContext *C, wmOperator *op, wmEvent *event)
{
    ViewOpsData *vod;
    RegionView3D *rv3d;

    /* makes op->customdata */
    viewops_data_create(C, op, event);
    vod= op->customdata;
    rv3d= vod->rv3d;

    if(rv3d->viewlock) { /* poll should check but in some cases fails, see poll func for details */
        viewops_data_free(C, op);
        return OPERATOR_PASS_THROUGH;
    }

    /* switch from camera view when: */
    if(rv3d->persp != RV3D_PERSP) {

        if (U.uiflag & USER_AUTOPERSP) {
            if(!ED_view3d_camera_lock_check(vod->v3d, vod->rv3d)) {
                rv3d->persp= RV3D_PERSP;
            }
        }
        else if(rv3d->persp==RV3D_CAMOB) {

            /* changed since 2.4x, use the camera view */
            if(vod->v3d->camera) {
                ED_view3d_from_object(vod->v3d->camera, rv3d->ofs, rv3d->viewquat, &rv3d->dist, NULL);
            }

            if(!ED_view3d_camera_lock_check(vod->v3d, vod->rv3d)) {
                rv3d->persp= rv3d->lpersp;
            }
        }
        ED_region_tag_redraw(vod->ar);
    }
    
    if (event->type == MOUSEPAN) {
        viewrotate_apply(vod, event->prevx, event->prevy);
        ED_view3d_depth_tag_update(rv3d);
        
        viewops_data_free(C, op);
        
        return OPERATOR_FINISHED;
    }
    else if (event->type == MOUSEROTATE) {
        /* MOUSEROTATE performs orbital rotation, so y axis delta is set to 0 */
        viewrotate_apply(vod, event->prevx, event->y);
        ED_view3d_depth_tag_update(rv3d);
        
        viewops_data_free(C, op);
        
        return OPERATOR_FINISHED;
    }
    else {      
        /* add temp handler */
        WM_event_add_modal_handler(C, op);

        return OPERATOR_RUNNING_MODAL;
    }
}

static int view3d_camera_active_poll(bContext *C)
{
    if(ED_operator_view3d_active(C)) {
        RegionView3D *rv3d= CTX_wm_region_view3d(C);
        if(rv3d && rv3d->persp==RV3D_CAMOB) {
            return 1;
        }
    }

    return 0;
}

/* test for unlocked camera view in quad view */
static int view3d_camera_user_poll(bContext *C)
{
    View3D *v3d;
    ARegion *ar;

    if (ED_view3d_context_user_region(C, &v3d, &ar)) {
        RegionView3D *rv3d = ar->regiondata;
        if(rv3d->persp==RV3D_CAMOB) {
            return 1;
        }
    }

    return 0;
}

static int viewrotate_cancel(bContext *C, wmOperator *op)
{
    viewops_data_free(C, op);

    return OPERATOR_CANCELLED;
}

void VIEW3D_OT_rotate(wmOperatorType *ot)
{

    /* identifiers */
    ot->name= "Rotate view";
    ot->description = "Rotate the view";
    ot->idname= "VIEW3D_OT_rotate";

    /* api callbacks */
    ot->invoke= viewrotate_invoke;
    ot->modal= viewrotate_modal;
    ot->poll= ED_operator_region_view3d_active;
    ot->cancel= viewrotate_cancel;

    /* flags */
    ot->flag= OPTYPE_BLOCKING|OPTYPE_GRAB_POINTER;
}

// NDOF utility functions
// (should these functions live in this file?)
float ndof_to_axis_angle(struct wmNDOFMotionData* ndof, float axis[3])
{
    return ndof->dt * normalize_v3_v3(axis, ndof->rvec);
}

void ndof_to_quat(struct wmNDOFMotionData* ndof, float q[4])
{
    float axis[3];
    float angle;

    angle= ndof_to_axis_angle(ndof, axis);
    axis_angle_to_quat(q, axis, angle);
}

/* -- "orbit" navigation (trackball/turntable)
 * -- zooming
 * -- panning in rotationally-locked views
 */
static int ndof_orbit_invoke(bContext *C, wmOperator *UNUSED(op), wmEvent *event)
{
    if (event->type != NDOF_MOTION) {
        return OPERATOR_CANCELLED;
    }
    else {
        View3D *v3d= CTX_wm_view3d(C);
        RegionView3D* rv3d = CTX_wm_region_view3d(C);
        wmNDOFMotionData* ndof = (wmNDOFMotionData*) event->customdata;

        ED_view3d_camera_lock_init(v3d, rv3d);

        rv3d->rot_angle = 0.f; // off by default, until changed later this function

        if (ndof->progress != P_FINISHING) {
            const float dt = ndof->dt;
        
            // tune these until everything feels right
            const float rot_sensitivity = 1.f;
            const float zoom_sensitivity = 1.f;
            const float pan_sensitivity = 1.f;
        
            // rather have bool, but...
            int has_rotation = rv3d->viewlock != RV3D_LOCKED && !is_zero_v3(ndof->rvec);
        
            float view_inv[4];
            invert_qt_qt(view_inv, rv3d->viewquat);
        
            //#define DEBUG_NDOF_MOTION
            #ifdef DEBUG_NDOF_MOTION
            printf("ndof: T=(%.2f,%.2f,%.2f) R=(%.2f,%.2f,%.2f) dt=%.3f delivered to 3D view\n",
                ndof->tx, ndof->ty, ndof->tz, ndof->rx, ndof->ry, ndof->rz, ndof->dt);
            #endif
        
            if (ndof->tvec[2]) {
                // Zoom!
                // velocity should be proportional to the linear velocity attained by rotational motion of same strength
                // [got that?]
                // proportional to arclength = radius * angle
        
                float zoom_distance = zoom_sensitivity * rv3d->dist * dt * ndof->tvec[2];

                if (U.ndof_flag & NDOF_ZOOM_INVERT)
                    zoom_distance = -zoom_distance;

                rv3d->dist += zoom_distance;
            }
        
            if (rv3d->viewlock == RV3D_LOCKED) {
                /* rotation not allowed -- explore panning options instead */
                float pan_vec[3] = {ndof->tvec[0], ndof->tvec[1], 0.0f};
                mul_v3_fl(pan_vec, pan_sensitivity * rv3d->dist * dt);
        
                /* transform motion from view to world coordinates */
                invert_qt_qt(view_inv, rv3d->viewquat);
                mul_qt_v3(view_inv, pan_vec);
        
                /* move center of view opposite of hand motion (this is camera mode, not object mode) */
                sub_v3_v3(rv3d->ofs, pan_vec);
            }
        
            if (has_rotation) {
        
                rv3d->view = RV3D_VIEW_USER;
        
                if (U.flag & USER_TRACKBALL) {
                    float rot[4];
                    float axis[3];
                    float angle = rot_sensitivity * ndof_to_axis_angle(ndof, axis);

                    if (U.ndof_flag & NDOF_ROLL_INVERT_AXIS)
                        axis[2] = -axis[2];

                    if (U.ndof_flag & NDOF_TILT_INVERT_AXIS)
                        axis[0] = -axis[0];

                    if (U.ndof_flag & NDOF_ROTATE_INVERT_AXIS)
                        axis[1] = -axis[1];

                    // transform rotation axis from view to world coordinates
                    mul_qt_v3(view_inv, axis);
        
                    // update the onscreen doo-dad
                    rv3d->rot_angle = angle;
                    copy_v3_v3(rv3d->rot_axis, axis);
        
                    axis_angle_to_quat(rot, axis, angle);

                    // apply rotation
                    mul_qt_qtqt(rv3d->viewquat, rv3d->viewquat, rot);
                } else {
                    /* turntable view code by John Aughey, adapted for 3D mouse by [mce] */
                    float angle, rot[4];
                    float xvec[3] = {1,0,0};
        
                    /* Determine the direction of the x vector (for rotating up and down) */
                    mul_qt_v3(view_inv, xvec);
        
                    /* Perform the up/down rotation */
                    angle = rot_sensitivity * dt * ndof->rvec[0];
                    if (U.ndof_flag & NDOF_TILT_INVERT_AXIS)
                        angle = -angle;
                    rot[0] = cos(angle);
                    mul_v3_v3fl(rot+1, xvec, sin(angle));
                    mul_qt_qtqt(rv3d->viewquat, rv3d->viewquat, rot);
        
                    /* Perform the orbital rotation */
                    angle = rot_sensitivity * dt * ndof->rvec[1];
                    if (U.ndof_flag & NDOF_ROTATE_INVERT_AXIS)
                        angle = -angle;
        
                    // update the onscreen doo-dad
                    rv3d->rot_angle = angle;
                    rv3d->rot_axis[0] = 0;
                    rv3d->rot_axis[1] = 0;
                    rv3d->rot_axis[2] = 1;
        
                    rot[0] = cos(angle);
                    rot[1] = rot[2] = 0.0;
                    rot[3] = sin(angle);
                    mul_qt_qtqt(rv3d->viewquat, rv3d->viewquat, rot);
                }
            }
        }

        ED_view3d_camera_lock_sync(v3d, rv3d);

        ED_region_tag_redraw(CTX_wm_region(C));

        return OPERATOR_FINISHED;
    }
}

void VIEW3D_OT_ndof_orbit(struct wmOperatorType *ot)
{
    /* identifiers */
    ot->name = "NDOF Orbit View";
    ot->description = "Explore every angle of an object using the 3D mouse";
    ot->idname = "VIEW3D_OT_ndof_orbit";

    /* api callbacks */
    ot->invoke = ndof_orbit_invoke;
    ot->poll = ED_operator_view3d_active;

    /* flags */
    ot->flag = 0;
}

/* -- "pan" navigation
 * -- zoom or dolly?
 */
static int ndof_pan_invoke(bContext *C, wmOperator *UNUSED(op), wmEvent *event)
{
    if (event->type != NDOF_MOTION) {
        return OPERATOR_CANCELLED;
    }
    else {
        View3D *v3d= CTX_wm_view3d(C);
        RegionView3D* rv3d = CTX_wm_region_view3d(C);
        wmNDOFMotionData* ndof = (wmNDOFMotionData*) event->customdata;

        ED_view3d_camera_lock_init(v3d, rv3d);

        rv3d->rot_angle = 0.f; // we're panning here! so erase any leftover rotation from other operators

        if (ndof->progress != P_FINISHING) {
            const float dt = ndof->dt;
            float view_inv[4];
#if 0 // ------------------------------------------- zoom with Z
            // tune these until everything feels right
            const float zoom_sensitivity = 1.f;
            const float pan_sensitivity = 1.f;

            float pan_vec[3] = {
                ndof->tx, ndof->ty, 0
                };

            // "zoom in" or "translate"? depends on zoom mode in user settings?
            if (ndof->tz) {
                float zoom_distance = zoom_sensitivity * rv3d->dist * dt * ndof->tz;
                rv3d->dist += zoom_distance;
            }
        
            mul_v3_fl(pan_vec, pan_sensitivity * rv3d->dist * dt);
#else // ------------------------------------------------------- dolly with Z
            float speed = 10.f; // blender units per second
            // ^^ this is ok for default cube scene, but should scale with.. something

            // tune these until everything feels right
            const float forward_sensitivity = 1.f;
            const float vertical_sensitivity = 0.4f;
            const float lateral_sensitivity = 0.6f;

            float pan_vec[3];

            if (U.ndof_flag & NDOF_PANX_INVERT_AXIS)
                pan_vec[0] = -lateral_sensitivity * ndof->tvec[0];
            else
                pan_vec[0] = lateral_sensitivity * ndof->tvec[0];

            if (U.ndof_flag & NDOF_PANZ_INVERT_AXIS)
                pan_vec[1] = -vertical_sensitivity * ndof->tvec[1];
            else
                pan_vec[1] = vertical_sensitivity * ndof->tvec[1];

            if (U.ndof_flag & NDOF_PANY_INVERT_AXIS)
                pan_vec[2] = -forward_sensitivity * ndof->tvec[2];
            else
                pan_vec[2] = forward_sensitivity * ndof->tvec[2];

            mul_v3_fl(pan_vec, speed * dt);
#endif
            /* transform motion from view to world coordinates */
            invert_qt_qt(view_inv, rv3d->viewquat);
            mul_qt_v3(view_inv, pan_vec);

            /* move center of view opposite of hand motion (this is camera mode, not object mode) */
            sub_v3_v3(rv3d->ofs, pan_vec);
        }

        ED_view3d_camera_lock_sync(v3d, rv3d);

        ED_region_tag_redraw(CTX_wm_region(C));

        return OPERATOR_FINISHED;
    }
}

void VIEW3D_OT_ndof_pan(struct wmOperatorType *ot)
{
    /* identifiers */
    ot->name = "NDOF Pan View";
    ot->description = "Position your viewpoint with the 3D mouse";
    ot->idname = "VIEW3D_OT_ndof_pan";

    /* api callbacks */
    ot->invoke = ndof_pan_invoke;
    ot->poll = ED_operator_view3d_active;

    /* flags */
    ot->flag = 0;
}

/* ************************ viewmove ******************************** */


/* NOTE: these defines are saved in keymap files, do not change values but just add new ones */

/* called in transform_ops.c, on each regeneration of keymaps  */
void viewmove_modal_keymap(wmKeyConfig *keyconf)
{
    static EnumPropertyItem modal_items[] = {
    {VIEW_MODAL_CONFIRM,    "CONFIRM", 0, "Confirm", ""},
        
    {VIEWROT_MODAL_SWITCH_ZOOM, "SWITCH_TO_ZOOM", 0, "Switch to Zoom"},
    {VIEWROT_MODAL_SWITCH_ROTATE, "SWITCH_TO_ROTATE", 0, "Switch to Rotate"},

    {0, NULL, 0, NULL, NULL}};

    wmKeyMap *keymap= WM_modalkeymap_get(keyconf, "View3D Move Modal");

    /* this function is called for each spacetype, only needs to add map once */
    if(keymap) return;

    keymap= WM_modalkeymap_add(keyconf, "View3D Move Modal", modal_items);

    /* items for modal map */
    WM_modalkeymap_add_item(keymap, MIDDLEMOUSE, KM_RELEASE, KM_ANY, 0, VIEW_MODAL_CONFIRM);
    WM_modalkeymap_add_item(keymap, ESCKEY, KM_PRESS, KM_ANY, 0, VIEW_MODAL_CONFIRM);

    /* disabled mode switching for now, can re-implement better, later on
    WM_modalkeymap_add_item(keymap, LEFTMOUSE, KM_PRESS, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ZOOM);
    WM_modalkeymap_add_item(keymap, LEFTCTRLKEY, KM_PRESS, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ZOOM);
    WM_modalkeymap_add_item(keymap, LEFTSHIFTKEY, KM_RELEASE, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ROTATE);
    */
    
    /* assign map to operators */
    WM_modalkeymap_assign(keymap, "VIEW3D_OT_move");
}


static void viewmove_apply(ViewOpsData *vod, int x, int y)
{
    if((vod->rv3d->persp==RV3D_CAMOB) && !ED_view3d_camera_lock_check(vod->v3d, vod->rv3d)) {
        const float zoomfac= BKE_screen_view3d_zoom_to_fac((float)vod->rv3d->camzoom) * 2.0f;
        vod->rv3d->camdx += (vod->oldx - x)/(vod->ar->winx * zoomfac);
        vod->rv3d->camdy += (vod->oldy - y)/(vod->ar->winy * zoomfac);
        CLAMP(vod->rv3d->camdx, -1.0f, 1.0f);
        CLAMP(vod->rv3d->camdy, -1.0f, 1.0f);
    }
    else {
        float dvec[3];
        float mval_f[2];

        mval_f[0]= x - vod->oldx;
        mval_f[1]= y - vod->oldy;
        ED_view3d_win_to_delta(vod->ar, mval_f, dvec);

        add_v3_v3(vod->rv3d->ofs, dvec);

        if(vod->rv3d->viewlock & RV3D_BOXVIEW)
            view3d_boxview_sync(vod->sa, vod->ar);
    }

    vod->oldx= x;
    vod->oldy= y;

    ED_view3d_camera_lock_sync(vod->v3d, vod->rv3d);

    ED_region_tag_redraw(vod->ar);
}


static int viewmove_modal(bContext *C, wmOperator *op, wmEvent *event)
{

    ViewOpsData *vod= op->customdata;
    short event_code= VIEW_PASS;

    /* execute the events */
    if(event->type==MOUSEMOVE) {
        event_code= VIEW_APPLY;
    }
    else if(event->type==EVT_MODAL_MAP) {
        switch (event->val) {
            case VIEW_MODAL_CONFIRM:
                event_code= VIEW_CONFIRM;
                break;
            case VIEWROT_MODAL_SWITCH_ZOOM:
                WM_operator_name_call(C, "VIEW3D_OT_zoom", WM_OP_INVOKE_DEFAULT, NULL);
                event_code= VIEW_CONFIRM;
                break;
            case VIEWROT_MODAL_SWITCH_ROTATE:
                WM_operator_name_call(C, "VIEW3D_OT_rotate", WM_OP_INVOKE_DEFAULT, NULL);
                event_code= VIEW_CONFIRM;
                break;
        }
    }
    else if(event->type==vod->origkey && event->val==KM_RELEASE) {
        event_code= VIEW_CONFIRM;
    }

    if(event_code==VIEW_APPLY) {
        viewmove_apply(vod, event->x, event->y);
    }
    else if (event_code==VIEW_CONFIRM) {
        ED_view3d_depth_tag_update(vod->rv3d);

        viewops_data_free(C, op);

        return OPERATOR_FINISHED;
    }

    return OPERATOR_RUNNING_MODAL;
}

static int viewmove_invoke(bContext *C, wmOperator *op, wmEvent *event)
{
    ViewOpsData *vod;

    /* makes op->customdata */
    viewops_data_create(C, op, event);
    vod= op->customdata;

    if (event->type == MOUSEPAN) {
        viewmove_apply(vod, event->prevx, event->prevy);
        ED_view3d_depth_tag_update(vod->rv3d);
        
        viewops_data_free(C, op);       
        
        return OPERATOR_FINISHED;
    }
    else {
        /* add temp handler */
        WM_event_add_modal_handler(C, op);

        return OPERATOR_RUNNING_MODAL;
    }
}

static int viewmove_cancel(bContext *C, wmOperator *op)
{
    viewops_data_free(C, op);

    return OPERATOR_CANCELLED;
}

void VIEW3D_OT_move(wmOperatorType *ot)
{

    /* identifiers */
    ot->name= "Move view";
    ot->description = "Move the view";
    ot->idname= "VIEW3D_OT_move";

    /* api callbacks */
    ot->invoke= viewmove_invoke;
    ot->modal= viewmove_modal;
    ot->poll= ED_operator_view3d_active;
    ot->cancel= viewmove_cancel;

    /* flags */
    ot->flag= OPTYPE_BLOCKING|OPTYPE_GRAB_POINTER;
}

/* ************************ viewzoom ******************************** */

/* viewdolly_modal_keymap has an exact copy of this, apply fixes to both */
/* called in transform_ops.c, on each regeneration of keymaps  */
void viewzoom_modal_keymap(wmKeyConfig *keyconf)
{
    static EnumPropertyItem modal_items[] = {
    {VIEW_MODAL_CONFIRM,    "CONFIRM", 0, "Confirm", ""},
        
    {VIEWROT_MODAL_SWITCH_ROTATE, "SWITCH_TO_ROTATE", 0, "Switch to Rotate"},
    {VIEWROT_MODAL_SWITCH_MOVE, "SWITCH_TO_MOVE", 0, "Switch to Move"},

    {0, NULL, 0, NULL, NULL}};

    wmKeyMap *keymap= WM_modalkeymap_get(keyconf, "View3D Zoom Modal");

    /* this function is called for each spacetype, only needs to add map once */
    if(keymap) return;

    keymap= WM_modalkeymap_add(keyconf, "View3D Zoom Modal", modal_items);

    /* items for modal map */
    WM_modalkeymap_add_item(keymap, MIDDLEMOUSE, KM_RELEASE, KM_ANY, 0, VIEW_MODAL_CONFIRM);
    WM_modalkeymap_add_item(keymap, ESCKEY, KM_PRESS, KM_ANY, 0, VIEW_MODAL_CONFIRM);

    /* disabled mode switching for now, can re-implement better, later on
    WM_modalkeymap_add_item(keymap, LEFTMOUSE, KM_RELEASE, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ROTATE);
    WM_modalkeymap_add_item(keymap, LEFTCTRLKEY, KM_RELEASE, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ROTATE);
    WM_modalkeymap_add_item(keymap, LEFTSHIFTKEY, KM_PRESS, KM_ANY, 0, VIEWROT_MODAL_SWITCH_MOVE);
     */
    
    /* assign map to operators */
    WM_modalkeymap_assign(keymap, "VIEW3D_OT_zoom");
}

static void view_zoom_mouseloc(ARegion *ar, float dfac, int mx, int my)
{
    RegionView3D *rv3d= ar->regiondata;

    if(U.uiflag & USER_ZOOM_TO_MOUSEPOS) {
        float dvec[3];
        float tvec[3];
        float tpos[3];
        float mval_f[2];
        float new_dist;

        negate_v3_v3(tpos, rv3d->ofs);

        /* Project cursor position into 3D space */
        initgrabz(rv3d, tpos[0], tpos[1], tpos[2]);

        mval_f[0]= (float)(((mx - ar->winrct.xmin) * 2) - ar->winx) / 2.0f;
        mval_f[1]= (float)(((my - ar->winrct.ymin) * 2) - ar->winy) / 2.0f;
        ED_view3d_win_to_delta(ar, mval_f, dvec);

        /* Calculate view target position for dolly */
        add_v3_v3v3(tvec, tpos, dvec);
        negate_v3(tvec);

        /* Offset to target position and dolly */
        new_dist = rv3d->dist * dfac;

        copy_v3_v3(rv3d->ofs, tvec);
        rv3d->dist = new_dist;

        /* Calculate final offset */
        madd_v3_v3v3fl(rv3d->ofs, tvec, dvec, dfac);
    } else {
        rv3d->dist *= dfac;
    }
}


static void viewzoom_apply(ViewOpsData *vod, int x, int y, const short viewzoom, const short zoom_invert)
{
    float zfac=1.0;

    if(viewzoom==USER_ZOOM_CONT) {
        double time= PIL_check_seconds_timer();
        float time_step= (float)(time - vod->timer_lastdraw);
        float fac;

        if (U.uiflag & USER_ZOOM_HORIZ) {
            fac= (float)(x - vod->origx);
        }
        else {
            fac= (float)(y - vod->origy);
        }

        if(zoom_invert) {
            fac= -fac;
        }

        // oldstyle zoom
        zfac = 1.0f + ((fac / 20.0f) * time_step);
        vod->timer_lastdraw= time;
    }
    else if(viewzoom==USER_ZOOM_SCALE) {
        int ctr[2], len1, len2;
        // method which zooms based on how far you move the mouse

        ctr[0] = (vod->ar->winrct.xmax + vod->ar->winrct.xmin)/2;
        ctr[1] = (vod->ar->winrct.ymax + vod->ar->winrct.ymin)/2;

        len1 = (int)sqrt((ctr[0] - x)*(ctr[0] - x) + (ctr[1] - y)*(ctr[1] - y)) + 5;
        len2 = (int)sqrt((ctr[0] - vod->origx)*(ctr[0] - vod->origx) + (ctr[1] - vod->origy)*(ctr[1] - vod->origy)) + 5;

        zfac = vod->dist0 * ((float)len2/len1) / vod->rv3d->dist;
    }
    else {  /* USER_ZOOM_DOLLY */
        float len1, len2;
        
        if (U.uiflag & USER_ZOOM_HORIZ) {
            len1 = (vod->ar->winrct.xmax - x) + 5;
            len2 = (vod->ar->winrct.xmax - vod->origx) + 5;
        }
        else {
            len1 = (vod->ar->winrct.ymax - y) + 5;
            len2 = (vod->ar->winrct.ymax - vod->origy) + 5;
        }
        if (zoom_invert) {
            SWAP(float, len1, len2);
        }
        
        zfac = vod->dist0 * (2.0f * ((len2/len1)-1.0f) + 1.0f) / vod->rv3d->dist;
    }

    if(zfac != 1.0f && zfac*vod->rv3d->dist > 0.001f * vod->grid &&
            zfac * vod->rv3d->dist < 10.0f * vod->far)
        view_zoom_mouseloc(vod->ar, zfac, vod->oldx, vod->oldy);

    /* these limits were in old code too */
    if(vod->rv3d->dist<0.001f * vod->grid) vod->rv3d->dist= 0.001f * vod->grid;
    if(vod->rv3d->dist>10.0f * vod->far) vod->rv3d->dist=10.0f * vod->far;

    if(vod->rv3d->viewlock & RV3D_BOXVIEW)
        view3d_boxview_sync(vod->sa, vod->ar);

    ED_view3d_camera_lock_sync(vod->v3d, vod->rv3d);

    ED_region_tag_redraw(vod->ar);
}


static int viewzoom_modal(bContext *C, wmOperator *op, wmEvent *event)
{
    ViewOpsData *vod= op->customdata;
    short event_code= VIEW_PASS;

    /* execute the events */
    if (event->type == TIMER && event->customdata == vod->timer) {
        /* continuous zoom */
        event_code= VIEW_APPLY;
    }
    else if(event->type==MOUSEMOVE) {
        event_code= VIEW_APPLY;
    }
    else if(event->type==EVT_MODAL_MAP) {
        switch (event->val) {
            case VIEW_MODAL_CONFIRM:
                event_code= VIEW_CONFIRM;
                break;
            case VIEWROT_MODAL_SWITCH_MOVE:
                WM_operator_name_call(C, "VIEW3D_OT_move", WM_OP_INVOKE_DEFAULT, NULL);
                event_code= VIEW_CONFIRM;
                break;
            case VIEWROT_MODAL_SWITCH_ROTATE:
                WM_operator_name_call(C, "VIEW3D_OT_rotate", WM_OP_INVOKE_DEFAULT, NULL);
                event_code= VIEW_CONFIRM;
                break;
        }
    }
    else if(event->type==vod->origkey && event->val==KM_RELEASE) {
        event_code= VIEW_CONFIRM;
    }

    if(event_code==VIEW_APPLY) {
        viewzoom_apply(vod, event->x, event->y, U.viewzoom, (U.uiflag & USER_ZOOM_INVERT) != 0);
    }
    else if (event_code==VIEW_CONFIRM) {
        ED_view3d_depth_tag_update(vod->rv3d);
        viewops_data_free(C, op);

        return OPERATOR_FINISHED;
    }

    return OPERATOR_RUNNING_MODAL;
}

static int viewzoom_exec(bContext *C, wmOperator *op)
{
    View3D *v3d;
    RegionView3D *rv3d;
    ScrArea *sa;
    ARegion *ar;
    short use_cam_zoom;

    int delta= RNA_int_get(op->ptr, "delta");
    int mx, my;

    if(op->customdata) {
        ViewOpsData *vod= op->customdata;

        sa= vod->sa;
        ar= vod->ar;
    }
    else {
        sa= CTX_wm_area(C);
        ar= CTX_wm_region(C);
    }

    v3d= sa->spacedata.first;
    rv3d= ar->regiondata;

    mx= RNA_struct_property_is_set(op->ptr, "mx") ? RNA_int_get(op->ptr, "mx") : ar->winx / 2;
    my= RNA_struct_property_is_set(op->ptr, "my") ? RNA_int_get(op->ptr, "my") : ar->winy / 2;

    use_cam_zoom= (rv3d->persp==RV3D_CAMOB) && !(rv3d->is_persp && ED_view3d_camera_lock_check(v3d, rv3d));

    if(delta < 0) {
        /* this min and max is also in viewmove() */
        if(use_cam_zoom) {
            rv3d->camzoom-= 10;
            if(rv3d->camzoom < RV3D_CAMZOOM_MIN) rv3d->camzoom= RV3D_CAMZOOM_MIN;
        }
        else if(rv3d->dist < 10.0f * v3d->far) {
            view_zoom_mouseloc(ar, 1.2f, mx, my);
        }
    }
    else {
        if(use_cam_zoom) {
            rv3d->camzoom+= 10;
            if(rv3d->camzoom > RV3D_CAMZOOM_MAX) rv3d->camzoom= RV3D_CAMZOOM_MAX;
        }
        else if(rv3d->dist> 0.001f * v3d->grid) {
            view_zoom_mouseloc(ar, .83333f, mx, my);
        }
    }

    if(rv3d->viewlock & RV3D_BOXVIEW)
        view3d_boxview_sync(sa, ar);

    ED_view3d_depth_tag_update(rv3d);

    ED_view3d_camera_lock_sync(v3d, rv3d);

    ED_region_tag_redraw(ar);

    viewops_data_free(C, op);

    return OPERATOR_FINISHED;
}

/* this is an exact copy of viewzoom_modal_keymap */
/* called in transform_ops.c, on each regeneration of keymaps  */
void viewdolly_modal_keymap(wmKeyConfig *keyconf)
{
    static EnumPropertyItem modal_items[] = {
    {VIEW_MODAL_CONFIRM,    "CONFIRM", 0, "Confirm", ""},

    {VIEWROT_MODAL_SWITCH_ROTATE, "SWITCH_TO_ROTATE", 0, "Switch to Rotate"},
    {VIEWROT_MODAL_SWITCH_MOVE, "SWITCH_TO_MOVE", 0, "Switch to Move"},

    {0, NULL, 0, NULL, NULL}};

    wmKeyMap *keymap= WM_modalkeymap_get(keyconf, "View3D Dolly Modal");

    /* this function is called for each spacetype, only needs to add map once */
    if(keymap) return;

    keymap= WM_modalkeymap_add(keyconf, "View3D Dolly Modal", modal_items);

    /* items for modal map */
    WM_modalkeymap_add_item(keymap, MIDDLEMOUSE, KM_RELEASE, KM_ANY, 0, VIEW_MODAL_CONFIRM);
    WM_modalkeymap_add_item(keymap, ESCKEY, KM_PRESS, KM_ANY, 0, VIEW_MODAL_CONFIRM);

    /* disabled mode switching for now, can re-implement better, later on
    WM_modalkeymap_add_item(keymap, LEFTMOUSE, KM_RELEASE, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ROTATE);
    WM_modalkeymap_add_item(keymap, LEFTCTRLKEY, KM_RELEASE, KM_ANY, 0, VIEWROT_MODAL_SWITCH_ROTATE);
    WM_modalkeymap_add_item(keymap, LEFTSHIFTKEY, KM_PRESS, KM_ANY, 0, VIEWROT_MODAL_SWITCH_MOVE);
     */
    
    /* assign map to operators */
    WM_modalkeymap_assign(keymap, "VIEW3D_OT_dolly");
}

/* viewdolly_invoke() copied this function, changes here may apply there */
static int viewzoom_invoke(bContext *C, wmOperator *op, wmEvent *event)
{
    ViewOpsData *vod;

    /* makes op->customdata */
    viewops_data_create(C, op, event);
    vod= op->customdata;

    /* if one or the other zoom position aren't set, set from event */
    if (!RNA_struct_property_is_set(op->ptr, "mx") || !RNA_struct_property_is_set(op->ptr, "my")) {
        RNA_int_set(op->ptr, "mx", event->x);
        RNA_int_set(op->ptr, "my", event->y);
    }

    if(RNA_struct_property_is_set(op->ptr, "delta")) {
        viewzoom_exec(C, op);
    }
    else {
        if (event->type == MOUSEZOOM) {
            /* Bypass Zoom invert flag for track pads (pass FALSE always) */

            if (U.uiflag & USER_ZOOM_HORIZ) {
                vod->origx = vod->oldx = event->x;
                viewzoom_apply(vod, event->prevx, event->prevy, USER_ZOOM_DOLLY, FALSE);
            }
            else {
                /* Set y move = x move as MOUSEZOOM uses only x axis to pass magnification value */
                vod->origy = vod->oldy = vod->origy + event->x - event->prevx;
                viewzoom_apply(vod, event->prevx, event->prevy, USER_ZOOM_DOLLY, FALSE);
            }
            ED_view3d_depth_tag_update(vod->rv3d);
            
            viewops_data_free(C, op);
            return OPERATOR_FINISHED;
        }
        else {
            if(U.viewzoom == USER_ZOOM_CONT) {
                /* needs a timer to continue redrawing */
                vod->timer= WM_event_add_timer(CTX_wm_manager(C), CTX_wm_window(C), TIMER, 0.01f);
                vod->timer_lastdraw= PIL_check_seconds_timer();
            }

            /* add temp handler */
            WM_event_add_modal_handler(C, op);

            return OPERATOR_RUNNING_MODAL;
        }
    }
    return OPERATOR_FINISHED;
}

static int viewzoom_cancel(bContext *C, wmOperator *op)
{
    viewops_data_free(C, op);

    return OPERATOR_CANCELLED;
}

void VIEW3D_OT_zoom(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "Zoom View";
    ot->description = "Zoom in/out in the view";
    ot->idname= "VIEW3D_OT_zoom";

    /* api callbacks */
    ot->invoke= viewzoom_invoke;
    ot->exec= viewzoom_exec;
    ot->modal= viewzoom_modal;
    ot->poll= ED_operator_region_view3d_active;
    ot->cancel= viewzoom_cancel;

    /* flags */
    ot->flag= OPTYPE_BLOCKING|OPTYPE_GRAB_POINTER;

    RNA_def_int(ot->srna, "delta", 0, INT_MIN, INT_MAX, "Delta", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "mx", 0, 0, INT_MAX, "Zoom Position X", "", 0, INT_MAX);
    RNA_def_int(ot->srna, "my", 0, 0, INT_MAX, "Zoom Position Y", "", 0, INT_MAX);
}


/* ************************ viewdolly ******************************** */
static void view_dolly_mouseloc(ARegion *ar, float orig_ofs[3], float dvec[3], float dfac)
{
    RegionView3D *rv3d= ar->regiondata;
    madd_v3_v3v3fl(rv3d->ofs, orig_ofs, dvec, -(1.0f - dfac));
}

static void viewdolly_apply(ViewOpsData *vod, int x, int y, const short zoom_invert)
{
    float zfac=1.0;

    {
        float len1, len2;

        if (U.uiflag & USER_ZOOM_HORIZ) {
            len1 = (vod->ar->winrct.xmax - x) + 5;
            len2 = (vod->ar->winrct.xmax - vod->origx) + 5;
        }
        else {
            len1 = (vod->ar->winrct.ymax - y) + 5;
            len2 = (vod->ar->winrct.ymax - vod->origy) + 5;
        }
        if (zoom_invert)
            SWAP(float, len1, len2);

        zfac =  1.0f + ((len2 - len1) * 0.01f * vod->rv3d->dist);
    }

    if(zfac != 1.0f)
        view_dolly_mouseloc(vod->ar, vod->ofs, vod->mousevec, zfac);

    if(vod->rv3d->viewlock & RV3D_BOXVIEW)
        view3d_boxview_sync(vod->sa, vod->ar);

    ED_view3d_camera_lock_sync(vod->v3d, vod->rv3d);

    ED_region_tag_redraw(vod->ar);
}


static int viewdolly_modal(bContext *C, wmOperator *op, wmEvent *event)
{
    ViewOpsData *vod= op->customdata;
    short event_code= VIEW_PASS;

    /* execute the events */
    if(event->type==MOUSEMOVE) {
        event_code= VIEW_APPLY;
    }
    else if(event->type==EVT_MODAL_MAP) {
        switch (event->val) {
            case VIEW_MODAL_CONFIRM:
                event_code= VIEW_CONFIRM;
                break;
            case VIEWROT_MODAL_SWITCH_MOVE:
                WM_operator_name_call(C, "VIEW3D_OT_move", WM_OP_INVOKE_DEFAULT, NULL);
                event_code= VIEW_CONFIRM;
                break;
            case VIEWROT_MODAL_SWITCH_ROTATE:
                WM_operator_name_call(C, "VIEW3D_OT_rotate", WM_OP_INVOKE_DEFAULT, NULL);
                event_code= VIEW_CONFIRM;
                break;
        }
    }
    else if(event->type==vod->origkey && event->val==KM_RELEASE) {
        event_code= VIEW_CONFIRM;
    }

    if(event_code==VIEW_APPLY) {
        viewdolly_apply(vod, event->x, event->y, (U.uiflag & USER_ZOOM_INVERT) != 0);
    }
    else if (event_code==VIEW_CONFIRM) {
        ED_view3d_depth_tag_update(vod->rv3d);
        viewops_data_free(C, op);

        return OPERATOR_FINISHED;
    }

    return OPERATOR_RUNNING_MODAL;
}

static int viewdolly_exec(bContext *C, wmOperator *op)
{
    /* View3D *v3d; */
    RegionView3D *rv3d;
    ScrArea *sa;
    ARegion *ar;
    float mousevec[3];

    int delta= RNA_int_get(op->ptr, "delta");

    if(op->customdata) {
        ViewOpsData *vod= op->customdata;

        sa= vod->sa;
        ar= vod->ar;
        copy_v3_v3(mousevec, vod->mousevec);
    }
    else {
        sa= CTX_wm_area(C);
        ar= CTX_wm_region(C);
        negate_v3_v3(mousevec, ((RegionView3D *)ar->regiondata)->viewinv[2]);
        normalize_v3(mousevec);
    }

    /* v3d= sa->spacedata.first; */ /* UNUSED */
    rv3d= ar->regiondata;

    /* overwrite the mouse vector with the view direction (zoom into the center) */
    if((U.uiflag & USER_ZOOM_TO_MOUSEPOS) == 0) {
        normalize_v3_v3(mousevec, rv3d->viewinv[2]);
    }

    if(delta < 0) {
        view_dolly_mouseloc(ar, rv3d->ofs, mousevec, 1.2f);
    }
    else {
        view_dolly_mouseloc(ar, rv3d->ofs, mousevec, .83333f);
    }

    if(rv3d->viewlock & RV3D_BOXVIEW)
        view3d_boxview_sync(sa, ar);

    ED_view3d_depth_tag_update(rv3d);
    ED_region_tag_redraw(ar);

    viewops_data_free(C, op);

    return OPERATOR_FINISHED;
}

/* copied from viewzoom_invoke(), changes here may apply there */
static int viewdolly_invoke(bContext *C, wmOperator *op, wmEvent *event)
{
    ViewOpsData *vod;

    /* makes op->customdata */
    viewops_data_create(C, op, event);
    vod= op->customdata;

    /* if one or the other zoom position aren't set, set from event */
    if (!RNA_struct_property_is_set(op->ptr, "mx") || !RNA_struct_property_is_set(op->ptr, "my")) {
        RNA_int_set(op->ptr, "mx", event->x);
        RNA_int_set(op->ptr, "my", event->y);
    }

    if(RNA_struct_property_is_set(op->ptr, "delta")) {
        viewdolly_exec(C, op);
    }
    else {
        /* overwrite the mouse vector with the view direction (zoom into the center) */
        if((U.uiflag & USER_ZOOM_TO_MOUSEPOS) == 0) {
            negate_v3_v3(vod->mousevec, vod->rv3d->viewinv[2]);
            normalize_v3(vod->mousevec);
        }

        if (event->type == MOUSEZOOM) {
            /* Bypass Zoom invert flag for track pads (pass FALSE always) */

            if (U.uiflag & USER_ZOOM_HORIZ) {
                vod->origx = vod->oldx = event->x;
                viewdolly_apply(vod, event->prevx, event->prevy, FALSE);
            }
            else {

                /* Set y move = x move as MOUSEZOOM uses only x axis to pass magnification value */
                vod->origy = vod->oldy = vod->origy + event->x - event->prevx;
                viewdolly_apply(vod, event->prevx, event->prevy, FALSE);
            }
            ED_view3d_depth_tag_update(vod->rv3d);

            viewops_data_free(C, op);
            return OPERATOR_FINISHED;
        }
        else {
            /* add temp handler */
            WM_event_add_modal_handler(C, op);

            return OPERATOR_RUNNING_MODAL;
        }
    }
    return OPERATOR_FINISHED;
}

/* like ED_operator_region_view3d_active but check its not in ortho view */
static int viewdolly_poll(bContext *C)
{
    RegionView3D *rv3d= CTX_wm_region_view3d(C);

    if(rv3d) {
        if (rv3d->persp == RV3D_PERSP) {
            return 1;
        }
        else {
            View3D *v3d= CTX_wm_view3d(C);
            if (ED_view3d_camera_lock_check(v3d, rv3d)) {
                return 1;
            }
        }
    }
    return 0;
}

static int viewdolly_cancel(bContext *C, wmOperator *op)
{
    viewops_data_free(C, op);

    return OPERATOR_CANCELLED;
}

void VIEW3D_OT_dolly(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "Dolly view";
    ot->description = "Dolly in/out in the view";
    ot->idname= "VIEW3D_OT_dolly";

    /* api callbacks */
    ot->invoke= viewdolly_invoke;
    ot->exec= viewdolly_exec;
    ot->modal= viewdolly_modal;
    ot->poll= viewdolly_poll;
    ot->cancel= viewdolly_cancel;

    /* flags */
    ot->flag= OPTYPE_BLOCKING|OPTYPE_GRAB_POINTER;

    RNA_def_int(ot->srna, "delta", 0, INT_MIN, INT_MAX, "Delta", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "mx", 0, 0, INT_MAX, "Zoom Position X", "", 0, INT_MAX);
    RNA_def_int(ot->srna, "my", 0, 0, INT_MAX, "Zoom Position Y", "", 0, INT_MAX);
}



static int view3d_all_exec(bContext *C, wmOperator *op) /* was view3d_home() in 2.4x */
{
    ARegion *ar= CTX_wm_region(C);
    View3D *v3d = CTX_wm_view3d(C);
    RegionView3D *rv3d= CTX_wm_region_view3d(C);
    Scene *scene= CTX_data_scene(C);
    Base *base;
    float *curs;
    const short skip_camera= ED_view3d_camera_lock_check(v3d, rv3d);

    int center= RNA_boolean_get(op->ptr, "center");

    float size, min[3], max[3], afm[3];
    int ok= 1, onedone=0;

    if(center) {
        /* in 2.4x this also move the cursor to (0, 0, 0) (with shift+c). */
        curs= give_cursor(scene, v3d);
        zero_v3(min);
        zero_v3(max);
        zero_v3(curs);
    }
    else {
        INIT_MINMAX(min, max);
    }

    for(base= scene->base.first; base; base= base->next) {
        if(BASE_VISIBLE(v3d, base)) {
            onedone= 1;

            if(skip_camera && base->object == v3d->camera) {
                continue;
            }

            minmax_object(base->object, min, max);
        }
    }
    if(!onedone) {
        ED_region_tag_redraw(ar);
        /* TODO - should this be cancel?
         * I think no, because we always move the cursor, with or without
         * object, but in this case there is no change in the scene,
         * only the cursor so I choice a ED_region_tag like
         * smooth_view do for the center_cursor.
         * See bug #22640
         */
        return OPERATOR_FINISHED;
    }

    sub_v3_v3v3(afm, max, min);
    size= 0.7f*MAX3(afm[0], afm[1], afm[2]);
    if(size == 0.0f) ok= 0;

    if(ok) {
        float new_dist;
        float new_ofs[3];

        new_dist = size;
        new_ofs[0]= -(min[0]+max[0])/2.0f;
        new_ofs[1]= -(min[1]+max[1])/2.0f;
        new_ofs[2]= -(min[2]+max[2])/2.0f;

        // correction for window aspect ratio
        if(ar->winy>2 && ar->winx>2) {
            size= (float)ar->winx/(float)ar->winy;
            if(size < 1.0f) size= 1.0f/size;
            new_dist*= size;
        }

        if ((rv3d->persp==RV3D_CAMOB) && !ED_view3d_camera_lock_check(v3d, rv3d)) {
            rv3d->persp= RV3D_PERSP;
            smooth_view(C, v3d, ar, v3d->camera, NULL, new_ofs, NULL, &new_dist, NULL);
        }
        else {
            smooth_view(C, v3d, ar, NULL, NULL, new_ofs, NULL, &new_dist, NULL);
        }
    }
// XXX  BIF_view3d_previewrender_signal(curarea, PR_DBASE|PR_DISPRECT);

    WM_event_add_notifier(C, NC_SPACE|ND_SPACE_VIEW3D, v3d);

    return OPERATOR_FINISHED;
}


void VIEW3D_OT_view_all(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "View All";
    ot->description = "View all objects in scene";
    ot->idname= "VIEW3D_OT_view_all";

    /* api callbacks */
    ot->exec= view3d_all_exec;
    ot->poll= ED_operator_region_view3d_active;

    /* flags */
    ot->flag= 0;

    RNA_def_boolean(ot->srna, "center", 0, "Center", "");
}


static int viewselected_exec(bContext *C, wmOperator *UNUSED(op)) /* like a localview without local!, was centerview() in 2.4x */
{
    ARegion *ar= CTX_wm_region(C);
    View3D *v3d = CTX_wm_view3d(C);
    RegionView3D *rv3d= CTX_wm_region_view3d(C);
    Scene *scene= CTX_data_scene(C);
    Object *ob= OBACT;
    Object *obedit= CTX_data_edit_object(C);
    float size, min[3], max[3], afm[3];
    int ok=0, ok_dist=1;
    const short skip_camera= ED_view3d_camera_lock_check(v3d, rv3d);

    /* SMOOTHVIEW */
    float new_ofs[3];
    float new_dist;

    INIT_MINMAX(min, max);

    if (ob && ob->mode & OB_MODE_WEIGHT_PAINT) {
        /* hardcoded exception, we look for the one selected armature */
        /* this is weak code this way, we should make a generic active/selection callback interface once... */
        Base *base;
        for(base=scene->base.first; base; base= base->next) {
            if(TESTBASELIB(v3d, base)) {
                if(base->object->type==OB_ARMATURE)
                    if(base->object->mode & OB_MODE_POSE)
                        break;
            }
        }
        if(base)
            ob= base->object;
    }


    if(obedit) {
        ok = minmax_verts(obedit, min, max);    /* only selected */
    }
    else if(ob && (ob->mode & OB_MODE_POSE)) {
        if(ob->pose) {
            bArmature *arm= ob->data;
            bPoseChannel *pchan;
            float vec[3];

            for(pchan= ob->pose->chanbase.first; pchan; pchan= pchan->next) {
                if(pchan->bone->flag & BONE_SELECTED) {
                    if(pchan->bone->layer & arm->layer) {
                        bPoseChannel *pchan_tx= pchan->custom_tx ? pchan->custom_tx : pchan;
                        ok= 1;
                        mul_v3_m4v3(vec, ob->obmat, pchan_tx->pose_head);
                        DO_MINMAX(vec, min, max);
                        mul_v3_m4v3(vec, ob->obmat, pchan_tx->pose_tail);
                        DO_MINMAX(vec, min, max);
                    }
                }
            }
        }
    }
    else if (paint_facesel_test(ob)) {
        ok= paintface_minmax(ob, min, max);
    }
    else if (ob && (ob->mode & OB_MODE_PARTICLE_EDIT)) {
        ok= PE_minmax(scene, min, max);
    }
    else {
        Base *base;
        for(base= FIRSTBASE; base; base = base->next) {
            if(TESTBASE(v3d, base))  {

                if(skip_camera && base->object == v3d->camera) {
                    continue;
                }

                /* account for duplis */
                if (minmax_object_duplis(scene, base->object, min, max)==0)
                    minmax_object(base->object, min, max); /* use if duplis not found */

                ok= 1;
            }
        }
    }

    if(ok==0) return OPERATOR_FINISHED;

    sub_v3_v3v3(afm, max, min);
    size= MAX3(afm[0], afm[1], afm[2]);

    if(!rv3d->is_persp) {
        if(size < 0.0001f) { /* if its a sinble point. dont even re-scale */
            ok_dist= 0;
        }
        else {
            /* perspective should be a bit farther away to look nice */
            size*= 0.7f;
        }
    }
    else {
        if(size <= v3d->near*1.5f) {
            size= v3d->near*1.5f;
        }
    }

    add_v3_v3v3(new_ofs, min, max);
    mul_v3_fl(new_ofs, -0.5f);

    new_dist = size;

    /* correction for window aspect ratio */
    if(ar->winy>2 && ar->winx>2) {
        size= (float)ar->winx/(float)ar->winy;
        if(size<1.0f) size= 1.0f/size;
        new_dist*= size;
    }

    if (rv3d->persp==RV3D_CAMOB && !ED_view3d_camera_lock_check(v3d, rv3d)) {
        rv3d->persp= RV3D_PERSP;
        smooth_view(C, v3d, ar, v3d->camera, NULL, new_ofs, NULL, &new_dist, NULL);
    }
    else {
        smooth_view(C, v3d, ar, NULL, NULL, new_ofs, NULL, ok_dist ? &new_dist : NULL, NULL);
    }

    /* smooth view does viewlock RV3D_BOXVIEW copy */
    
// XXX  BIF_view3d_previewrender_signal(curarea, PR_DBASE|PR_DISPRECT);

    return OPERATOR_FINISHED;
}

void VIEW3D_OT_view_selected(wmOperatorType *ot)
{

    /* identifiers */
    ot->name= "View Selected";
    ot->description = "Move the view to the selection center";
    ot->idname= "VIEW3D_OT_view_selected";

    /* api callbacks */
    ot->exec= viewselected_exec;
    ot->poll= ED_operator_region_view3d_active;

    /* flags */
    ot->flag= 0;
}

static int viewcenter_cursor_exec(bContext *C, wmOperator *UNUSED(op))
{
    View3D *v3d = CTX_wm_view3d(C);
    RegionView3D *rv3d= CTX_wm_region_view3d(C);
    Scene *scene= CTX_data_scene(C);
    
    if (rv3d) {
        ARegion *ar= CTX_wm_region(C);

        /* non camera center */
        float new_ofs[3];
        negate_v3_v3(new_ofs, give_cursor(scene, v3d));
        smooth_view(C, v3d, ar, NULL, NULL, new_ofs, NULL, NULL, NULL);
        
        /* smooth view does viewlock RV3D_BOXVIEW copy */
    }
    
    return OPERATOR_FINISHED;
}

void VIEW3D_OT_view_center_cursor(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "Center View to Cursor";
    ot->description= "Center the view so that the cursor is in the middle of the view";
    ot->idname= "VIEW3D_OT_view_center_cursor";
    
    /* api callbacks */
    ot->exec= viewcenter_cursor_exec;
    ot->poll= ED_operator_view3d_active;
    
    /* flags */
    ot->flag= 0;
}

static int view3d_center_camera_exec(bContext *C, wmOperator *UNUSED(op)) /* was view3d_home() in 2.4x */
{
    Scene *scene= CTX_data_scene(C);
    float xfac, yfac;
    float size[2];

    View3D *v3d;
    ARegion *ar;
    RegionView3D *rv3d;

    /* no NULL check is needed, poll checks */
    ED_view3d_context_user_region(C, &v3d, &ar);
    rv3d = ar->regiondata;

    rv3d->camdx= rv3d->camdy= 0.0f;

    ED_view3d_calc_camera_border_size(scene, ar, v3d, rv3d, size);

    /* 4px is just a little room from the edge of the area */
    xfac= (float)ar->winx / (float)(size[0] + 4);
    yfac= (float)ar->winy / (float)(size[1] + 4);

    rv3d->camzoom= BKE_screen_view3d_zoom_from_fac(MIN2(xfac, yfac));
    CLAMP(rv3d->camzoom, RV3D_CAMZOOM_MIN, RV3D_CAMZOOM_MAX);

    WM_event_add_notifier(C, NC_SPACE|ND_SPACE_VIEW3D, CTX_wm_view3d(C));

    return OPERATOR_FINISHED;
}

void VIEW3D_OT_view_center_camera(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "View Camera Center";
    ot->description = "Center the camera view";
    ot->idname= "VIEW3D_OT_view_center_camera";

    /* api callbacks */
    ot->exec= view3d_center_camera_exec;
    ot->poll= view3d_camera_user_poll;

    /* flags */
    ot->flag= 0;
}

/* ********************* Set render border operator ****************** */

static int render_border_exec(bContext *C, wmOperator *op)
{
    View3D *v3d = CTX_wm_view3d(C);
    ARegion *ar= CTX_wm_region(C);
    RegionView3D *rv3d= ED_view3d_context_rv3d(C);
    Scene *scene= CTX_data_scene(C);

    rcti rect;
    rctf vb;

    /* get border select values using rna */
    rect.xmin= RNA_int_get(op->ptr, "xmin");
    rect.ymin= RNA_int_get(op->ptr, "ymin");
    rect.xmax= RNA_int_get(op->ptr, "xmax");
    rect.ymax= RNA_int_get(op->ptr, "ymax");

    /* calculate range */
    ED_view3d_calc_camera_border(scene, ar, v3d, rv3d, &vb, FALSE);

    scene->r.border.xmin= ((float)rect.xmin-vb.xmin)/(vb.xmax-vb.xmin);
    scene->r.border.ymin= ((float)rect.ymin-vb.ymin)/(vb.ymax-vb.ymin);
    scene->r.border.xmax= ((float)rect.xmax-vb.xmin)/(vb.xmax-vb.xmin);
    scene->r.border.ymax= ((float)rect.ymax-vb.ymin)/(vb.ymax-vb.ymin);

    /* actually set border */
    CLAMP(scene->r.border.xmin, 0.0f, 1.0f);
    CLAMP(scene->r.border.ymin, 0.0f, 1.0f);
    CLAMP(scene->r.border.xmax, 0.0f, 1.0f);
    CLAMP(scene->r.border.ymax, 0.0f, 1.0f);

    /* drawing a border surrounding the entire camera view switches off border rendering
     * or the border covers no pixels */
    if ((scene->r.border.xmin <= 0.0f && scene->r.border.xmax >= 1.0f &&
        scene->r.border.ymin <= 0.0f && scene->r.border.ymax >= 1.0f) ||
       (scene->r.border.xmin == scene->r.border.xmax ||
        scene->r.border.ymin == scene->r.border.ymax ))
    {
        scene->r.mode &= ~R_BORDER;
    } else {
        scene->r.mode |= R_BORDER;
    }
    
    WM_event_add_notifier(C, NC_SCENE|ND_RENDER_OPTIONS, NULL);

    return OPERATOR_FINISHED;

}

void VIEW3D_OT_render_border(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "Set Render Border";
    ot->description = "Set the boundaries of the border render and enables border render";
    ot->idname= "VIEW3D_OT_render_border";

    /* api callbacks */
    ot->invoke= WM_border_select_invoke;
    ot->exec= render_border_exec;
    ot->modal= WM_border_select_modal;
    ot->cancel= WM_border_select_cancel;

    ot->poll= view3d_camera_active_poll;

    /* flags */
    ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

    /* rna */
    RNA_def_int(ot->srna, "xmin", 0, INT_MIN, INT_MAX, "X Min", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "xmax", 0, INT_MIN, INT_MAX, "X Max", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "ymin", 0, INT_MIN, INT_MAX, "Y Min", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "ymax", 0, INT_MIN, INT_MAX, "Y Max", "", INT_MIN, INT_MAX);

}
/* ********************* Border Zoom operator ****************** */

static int view3d_zoom_border_exec(bContext *C, wmOperator *op)
{
    ARegion *ar= CTX_wm_region(C);
    View3D *v3d = CTX_wm_view3d(C);
    RegionView3D *rv3d= CTX_wm_region_view3d(C);
    Scene *scene= CTX_data_scene(C);

    /* Zooms in on a border drawn by the user */
    rcti rect;
    float dvec[3], vb[2], xscale, yscale, scale;

    /* SMOOTHVIEW */
    float new_dist;
    float new_ofs[3];

    /* ZBuffer depth vars */
    bglMats mats;
    float depth_close= FLT_MAX;
    double cent[2],  p[3];

    /* note; otherwise opengl won't work */
    view3d_operator_needs_opengl(C);

    /* get border select values using rna */
    rect.xmin= RNA_int_get(op->ptr, "xmin");
    rect.ymin= RNA_int_get(op->ptr, "ymin");
    rect.xmax= RNA_int_get(op->ptr, "xmax");
    rect.ymax= RNA_int_get(op->ptr, "ymax");

    /* Get Z Depths, needed for perspective, nice for ortho */
    bgl_get_mats(&mats);
    draw_depth(scene, ar, v3d, NULL);
    
    {
        /* avoid allocating the whole depth buffer */
        ViewDepths depth_temp= {0};

        /* avoid view3d_update_depths() for speed. */
        view3d_update_depths_rect(ar, &depth_temp, &rect);
    
        /* find the closest Z pixel */
        depth_close= view3d_depth_near(&depth_temp);
    
        MEM_freeN(depth_temp.depths);
    }

    cent[0] = (((double)rect.xmin)+((double)rect.xmax)) / 2;
    cent[1] = (((double)rect.ymin)+((double)rect.ymax)) / 2;

    if (rv3d->is_persp) {
        double p_corner[3];

        /* no depths to use, we cant do anything! */
        if (depth_close==FLT_MAX){
            BKE_report(op->reports, RPT_ERROR, "Depth Too Large");
            return OPERATOR_CANCELLED;
        }
        /* convert border to 3d coordinates */
        if ((   !gluUnProject(cent[0], cent[1], depth_close, mats.modelview, mats.projection, (GLint *)mats.viewport, &p[0], &p[1], &p[2])) ||
            (   !gluUnProject((double)rect.xmin, (double)rect.ymin, depth_close, mats.modelview, mats.projection, (GLint *)mats.viewport, &p_corner[0], &p_corner[1], &p_corner[2])))
            return OPERATOR_CANCELLED;

        dvec[0] = p[0]-p_corner[0];
        dvec[1] = p[1]-p_corner[1];
        dvec[2] = p[2]-p_corner[2];

        new_dist = len_v3(dvec);
        if(new_dist <= v3d->near * 1.5f) new_dist= v3d->near * 1.5f;

        new_ofs[0] = -p[0];
        new_ofs[1] = -p[1];
        new_ofs[2] = -p[2];

    } else { /* othographic */
        /* find the current window width and height */
        vb[0] = ar->winx;
        vb[1] = ar->winy;

        new_dist = rv3d->dist;

        /* convert the drawn rectangle into 3d space */
        if (depth_close!=FLT_MAX && gluUnProject(cent[0], cent[1], depth_close, mats.modelview, mats.projection, (GLint *)mats.viewport, &p[0], &p[1], &p[2])) {
            new_ofs[0] = -p[0];
            new_ofs[1] = -p[1];
            new_ofs[2] = -p[2];
        }
        else {
            float mval_f[2];
            /* We cant use the depth, fallback to the old way that dosnt set the center depth */
            copy_v3_v3(new_ofs, rv3d->ofs);

            initgrabz(rv3d, -new_ofs[0], -new_ofs[1], -new_ofs[2]);

            mval_f[0]= (rect.xmin + rect.xmax - vb[0]) / 2.0f;
            mval_f[1]= (rect.ymin + rect.ymax - vb[1]) / 2.0f;
            ED_view3d_win_to_delta(ar, mval_f, dvec);
            /* center the view to the center of the rectangle */
            sub_v3_v3(new_ofs, dvec);
        }

        /* work out the ratios, so that everything selected fits when we zoom */
        xscale = ((rect.xmax-rect.xmin)/vb[0]);
        yscale = ((rect.ymax-rect.ymin)/vb[1]);
        scale = (xscale >= yscale)?xscale:yscale;

        /* zoom in as required, or as far as we can go */
        new_dist = ((new_dist*scale) >= 0.001f * v3d->grid)? new_dist*scale:0.001f * v3d->grid;
    }

    smooth_view(C, v3d, ar, NULL, NULL, new_ofs, NULL, &new_dist, NULL);

    if(rv3d->viewlock & RV3D_BOXVIEW)
        view3d_boxview_sync(CTX_wm_area(C), ar);

    return OPERATOR_FINISHED;
}

static int view3d_zoom_border_invoke(bContext *C, wmOperator *op, wmEvent *event)
{
    View3D *v3d= CTX_wm_view3d(C);
    RegionView3D *rv3d= CTX_wm_region_view3d(C);

    /* if in camera view do not exec the operator so we do not conflict with set render border*/
    if ((rv3d->persp != RV3D_CAMOB) || ED_view3d_camera_lock_check(v3d, rv3d))
        return WM_border_select_invoke(C, op, event);
    else
        return OPERATOR_PASS_THROUGH;
}

void VIEW3D_OT_zoom_border(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "Border Zoom";
    ot->description = "Zoom in the view to the nearest object contained in the border";
    ot->idname= "VIEW3D_OT_zoom_border";

    /* api callbacks */
    ot->invoke= view3d_zoom_border_invoke;
    ot->exec= view3d_zoom_border_exec;
    ot->modal= WM_border_select_modal;
    ot->cancel= WM_border_select_cancel;

    ot->poll= ED_operator_region_view3d_active;

    /* flags */
    ot->flag= 0;

    /* rna */
    RNA_def_int(ot->srna, "xmin", 0, INT_MIN, INT_MAX, "X Min", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "xmax", 0, INT_MIN, INT_MAX, "X Max", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "ymin", 0, INT_MIN, INT_MAX, "Y Min", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "ymax", 0, INT_MIN, INT_MAX, "Y Max", "", INT_MIN, INT_MAX);

}

/* sets the view to 1:1 camera/render-pixel */
static void view3d_set_1_to_1_viewborder(Scene *scene, ARegion *ar, View3D *v3d)
{
    RegionView3D *rv3d= ar->regiondata;
    float size[2];
    int im_width= (scene->r.size*scene->r.xsch)/100;
    
    ED_view3d_calc_camera_border_size(scene, ar, v3d, rv3d, size);

    rv3d->camzoom= BKE_screen_view3d_zoom_from_fac((float)im_width/size[0]);
    CLAMP(rv3d->camzoom, RV3D_CAMZOOM_MIN, RV3D_CAMZOOM_MAX);
}

static int view3d_zoom_1_to_1_camera_exec(bContext *C, wmOperator *UNUSED(op))
{
    Scene *scene= CTX_data_scene(C);

    View3D *v3d;
    ARegion *ar;

    /* no NULL check is needed, poll checks */
    ED_view3d_context_user_region(C, &v3d, &ar);

    view3d_set_1_to_1_viewborder(scene, ar, v3d);

    WM_event_add_notifier(C, NC_SPACE|ND_SPACE_VIEW3D, v3d);

    return OPERATOR_FINISHED;
}

void VIEW3D_OT_zoom_camera_1_to_1(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "Zoom Camera 1:1";
    ot->description = "Match the camera to 1:1 to the render output";
    ot->idname= "VIEW3D_OT_zoom_camera_1_to_1";

    /* api callbacks */
    ot->exec= view3d_zoom_1_to_1_camera_exec;
    ot->poll= view3d_camera_user_poll;

    /* flags */
    ot->flag= 0;
}

/* ********************* Changing view operator ****************** */

static EnumPropertyItem prop_view_items[] = {
    {RV3D_VIEW_FRONT, "FRONT", 0, "Front", "View From the Front"},
    {RV3D_VIEW_BACK, "BACK", 0, "Back", "View From the Back"},
    {RV3D_VIEW_LEFT, "LEFT", 0, "Left", "View From the Left"},
    {RV3D_VIEW_RIGHT, "RIGHT", 0, "Right", "View From the Right"},
    {RV3D_VIEW_TOP, "TOP", 0, "Top", "View From the Top"},
    {RV3D_VIEW_BOTTOM, "BOTTOM", 0, "Bottom", "View From the Bottom"},
    {RV3D_VIEW_CAMERA, "CAMERA", 0, "Camera", "View From the active camera"},
    {0, NULL, 0, NULL, NULL}};


/* would like to make this a generic function - outside of transform */

static void axis_set_view(bContext *C, View3D *v3d, ARegion *ar, float q1, float q2, float q3, float q4, short view, int perspo, int align_active)
{
    RegionView3D *rv3d= ar->regiondata; /* no NULL check is needed, poll checks */
    float new_quat[4];

    new_quat[0]= q1; new_quat[1]= q2;
    new_quat[2]= q3; new_quat[3]= q4;
    normalize_qt(new_quat);

    if(align_active) {
        /* align to active object */
        Object *obact= CTX_data_active_object(C);
        if (obact==NULL) {
            /* no active object, ignore this option */
            align_active= FALSE;
        }
        else {
            float obact_quat[4];
            float twmat[3][3];

            /* same as transform manipulator when normal is set */
            ED_getTransformOrientationMatrix(C, twmat, FALSE);

            mat3_to_quat( obact_quat,twmat);
            invert_qt(obact_quat);
            mul_qt_qtqt(new_quat, new_quat, obact_quat);

            rv3d->view= view= RV3D_VIEW_USER;
        }
    }

    if(align_active==FALSE) {
        /* normal operation */
        if(rv3d->viewlock) {
            /* only pass on if */
            if(rv3d->view==RV3D_VIEW_FRONT && view==RV3D_VIEW_BACK);
            else if(rv3d->view==RV3D_VIEW_BACK && view==RV3D_VIEW_FRONT);
            else if(rv3d->view==RV3D_VIEW_RIGHT && view==RV3D_VIEW_LEFT);
            else if(rv3d->view==RV3D_VIEW_LEFT && view==RV3D_VIEW_RIGHT);
            else if(rv3d->view==RV3D_VIEW_BOTTOM && view==RV3D_VIEW_TOP);
            else if(rv3d->view==RV3D_VIEW_TOP && view==RV3D_VIEW_BOTTOM);
            else return;
        }

        rv3d->view= view;
    }

    if(rv3d->viewlock) {
        ED_region_tag_redraw(ar);
        return;
    }

    if (rv3d->persp==RV3D_CAMOB && v3d->camera) {

        if (U.uiflag & USER_AUTOPERSP) rv3d->persp= view ? RV3D_ORTHO : RV3D_PERSP;
        else if(rv3d->persp==RV3D_CAMOB) rv3d->persp= perspo;

        smooth_view(C, v3d, ar, v3d->camera, NULL, rv3d->ofs, new_quat, NULL, NULL);
    }
    else {

        if (U.uiflag & USER_AUTOPERSP) rv3d->persp= view ? RV3D_ORTHO : RV3D_PERSP;
        else if(rv3d->persp==RV3D_CAMOB) rv3d->persp= perspo;

        smooth_view(C, v3d, ar, NULL, NULL, NULL, new_quat, NULL, NULL);
    }

}

static int viewnumpad_exec(bContext *C, wmOperator *op)
{
    View3D *v3d;
    ARegion *ar;
    RegionView3D *rv3d;
    Scene *scene= CTX_data_scene(C);
    static int perspo = RV3D_PERSP;
    int viewnum, align_active, nextperspo;

    /* no NULL check is needed, poll checks */
    ED_view3d_context_user_region(C, &v3d, &ar);
    rv3d = ar->regiondata;

    viewnum = RNA_enum_get(op->ptr, "type");
    align_active = RNA_boolean_get(op->ptr, "align_active");

    /* set this to zero, gets handled in axis_set_view */
    if(rv3d->viewlock)
        align_active= 0;

    /* Use this to test if we started out with a camera */

    if (rv3d->persp == RV3D_CAMOB) {
        nextperspo= rv3d->lpersp;
    } else {
        nextperspo= perspo;
    }

    switch (viewnum) {
        case RV3D_VIEW_BOTTOM :
            axis_set_view(C, v3d, ar, 0.0, -1.0, 0.0, 0.0, viewnum, nextperspo, align_active);
            break;

        case RV3D_VIEW_BACK:
            axis_set_view(C, v3d, ar, 0.0, 0.0, (float)-cos(M_PI/4.0), (float)-cos(M_PI/4.0), viewnum, nextperspo, align_active);
            break;

        case RV3D_VIEW_LEFT:
            axis_set_view(C, v3d, ar, 0.5, -0.5, 0.5, 0.5, viewnum, nextperspo, align_active);
            break;

        case RV3D_VIEW_TOP:
            axis_set_view(C, v3d, ar, 1.0, 0.0, 0.0, 0.0, viewnum, nextperspo, align_active);
            break;

        case RV3D_VIEW_FRONT:
            axis_set_view(C, v3d, ar, (float)cos(M_PI/4.0), (float)-sin(M_PI/4.0), 0.0, 0.0, viewnum, nextperspo, align_active);
            break;

        case RV3D_VIEW_RIGHT:
            axis_set_view(C, v3d, ar, 0.5, -0.5, -0.5, -0.5, viewnum, nextperspo, align_active);
            break;

        case RV3D_VIEW_CAMERA:
            if(rv3d->viewlock==0) {
                /* lastview -  */

                if(rv3d->persp != RV3D_CAMOB) {
                    Object *ob= OBACT;

                    if (!rv3d->smooth_timer) {
                        /* store settings of current view before allowing overwriting with camera view
                         * only if we're not currently in a view transition */
                        copy_qt_qt(rv3d->lviewquat, rv3d->viewquat);
                        rv3d->lview= rv3d->view;
                        rv3d->lpersp= rv3d->persp;
                    }

    #if 0
                    if(G.qual==LR_ALTKEY) {
                        if(oldcamera && is_an_active_object(oldcamera)) {
                            v3d->camera= oldcamera;
                        }
                        handle_view3d_lock();
                    }
    #endif
                    
                    /* first get the default camera for the view lock type */
                    if(v3d->scenelock) {
                        /* sets the camera view if available */
                        v3d->camera= scene->camera;                     
                    }
                    else {
                        /* use scene camera if one is not set (even though we're unlocked) */
                        if(v3d->camera==NULL) {
                            v3d->camera= scene->camera;
                        }
                    }

                    /* if the camera isnt found, check a number of options */
                    if(v3d->camera==NULL && ob && ob->type==OB_CAMERA)
                        v3d->camera= ob;
                    
                    if(v3d->camera==NULL)
                        v3d->camera= scene_find_camera(scene);      

                    /* couldnt find any useful camera, bail out */
                    if(v3d->camera==NULL)
                        return OPERATOR_CANCELLED;
                    
                    /* important these dont get out of sync for locked scenes */
                    if(v3d->scenelock)
                        scene->camera= v3d->camera;

                    /* finally do snazzy view zooming */
                    rv3d->persp= RV3D_CAMOB;
                    smooth_view(C, v3d, ar, NULL, v3d->camera, rv3d->ofs, rv3d->viewquat, &rv3d->dist, &v3d->lens);

                }
                else{
                    /* return to settings of last view */
                    /* does smooth_view too */
                    axis_set_view(C, v3d, ar, rv3d->lviewquat[0], rv3d->lviewquat[1], rv3d->lviewquat[2], rv3d->lviewquat[3], rv3d->lview, rv3d->lpersp, 0);
                }
            }
            break;

        default :
            break;
    }

    if(rv3d->persp != RV3D_CAMOB) perspo= rv3d->persp;

    return OPERATOR_FINISHED;
}


void VIEW3D_OT_viewnumpad(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "View numpad";
    ot->description = "Set the view";
    ot->idname= "VIEW3D_OT_viewnumpad";

    /* api callbacks */
    ot->exec= viewnumpad_exec;
    ot->poll= ED_operator_rv3d_user_region_poll;

    /* flags */
    ot->flag= 0;

    RNA_def_enum(ot->srna, "type", prop_view_items, 0, "View", "The Type of view");
    RNA_def_boolean(ot->srna, "align_active", 0, "Align Active", "Align to the active object's axis");
}

static EnumPropertyItem prop_view_orbit_items[] = {
    {V3D_VIEW_STEPLEFT, "ORBITLEFT", 0, "Orbit Left", "Orbit the view around to the Left"},
    {V3D_VIEW_STEPRIGHT, "ORBITRIGHT", 0, "Orbit Right", "Orbit the view around to the Right"},
    {V3D_VIEW_STEPUP, "ORBITUP", 0, "Orbit Up", "Orbit the view Up"},
    {V3D_VIEW_STEPDOWN, "ORBITDOWN", 0, "Orbit Down", "Orbit the view Down"},
    {0, NULL, 0, NULL, NULL}};

static int vieworbit_exec(bContext *C, wmOperator *op)
{
    View3D *v3d;
    ARegion *ar;
    RegionView3D *rv3d;
    float phi, q1[4], new_quat[4];
    int orbitdir;

    /* no NULL check is needed, poll checks */
    ED_view3d_context_user_region(C, &v3d, &ar);
    rv3d = ar->regiondata;

    orbitdir = RNA_enum_get(op->ptr, "type");

    if(rv3d->viewlock==0) {
        if((rv3d->persp != RV3D_CAMOB) || ED_view3d_camera_lock_check(v3d, rv3d)) {
            if(orbitdir == V3D_VIEW_STEPLEFT || orbitdir == V3D_VIEW_STEPRIGHT) {
                float si;
                /* z-axis */
                phi= (float)(M_PI/360.0)*U.pad_rot_angle;
                if(orbitdir == V3D_VIEW_STEPRIGHT) phi= -phi;
                si= (float)sin(phi);
                q1[0]= (float)cos(phi);
                q1[1]= q1[2]= 0.0;
                q1[3]= si;
                mul_qt_qtqt(new_quat, rv3d->viewquat, q1);
                rv3d->view= RV3D_VIEW_USER;
            }
            else if(orbitdir == V3D_VIEW_STEPDOWN || orbitdir == V3D_VIEW_STEPUP) {
                /* horizontal axis */
                copy_v3_v3(q1+1, rv3d->viewinv[0]);

                normalize_v3(q1+1);
                phi= (float)(M_PI/360.0)*U.pad_rot_angle;
                if(orbitdir == V3D_VIEW_STEPDOWN) phi= -phi;
                q1[0]= (float)cos(phi);
                mul_v3_fl(q1+1, sin(phi));
                mul_qt_qtqt(new_quat, rv3d->viewquat, q1);
                rv3d->view= RV3D_VIEW_USER;
            }

            smooth_view(C, CTX_wm_view3d(C), ar, NULL, NULL, NULL, new_quat, NULL, NULL);
        }
    }

    return OPERATOR_FINISHED;
}

void VIEW3D_OT_view_orbit(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "View Orbit";
    ot->description = "Orbit the view";
    ot->idname= "VIEW3D_OT_view_orbit";

    /* api callbacks */
    ot->exec= vieworbit_exec;
    ot->poll= ED_operator_rv3d_user_region_poll;

    /* flags */
    ot->flag= 0;
    RNA_def_enum(ot->srna, "type", prop_view_orbit_items, 0, "Orbit", "Direction of View Orbit");
}

static EnumPropertyItem prop_view_pan_items[] = {
    {V3D_VIEW_PANLEFT, "PANLEFT", 0, "Pan Left", "Pan the view to the Left"},
    {V3D_VIEW_PANRIGHT, "PANRIGHT", 0, "Pan Right", "Pan the view to the Right"},
    {V3D_VIEW_PANUP, "PANUP", 0, "Pan Up", "Pan the view Up"},
    {V3D_VIEW_PANDOWN, "PANDOWN", 0, "Pan Down", "Pan the view Down"},
    {0, NULL, 0, NULL, NULL}};

static int viewpan_exec(bContext *C, wmOperator *op)
{
    ARegion *ar= CTX_wm_region(C);
    RegionView3D *rv3d= CTX_wm_region_view3d(C);
    float vec[3];
    float mval_f[2]= {0.0f, 0.0f};
    int pandir;

    pandir = RNA_enum_get(op->ptr, "type");

    initgrabz(rv3d, 0.0, 0.0, 0.0);
    if(pandir == V3D_VIEW_PANRIGHT)     { mval_f[0]= -32.0f; ED_view3d_win_to_delta(ar, mval_f, vec); }
    else if(pandir == V3D_VIEW_PANLEFT) { mval_f[0]=  32.0f; ED_view3d_win_to_delta(ar, mval_f, vec); }
    else if(pandir == V3D_VIEW_PANUP)   { mval_f[1]= -25.0f; ED_view3d_win_to_delta(ar, mval_f, vec); }
    else if(pandir == V3D_VIEW_PANDOWN) { mval_f[1]=  25.0f; ED_view3d_win_to_delta(ar, mval_f, vec); }
    add_v3_v3(rv3d->ofs, vec);

    if(rv3d->viewlock & RV3D_BOXVIEW)
        view3d_boxview_sync(CTX_wm_area(C), ar);

    ED_region_tag_redraw(ar);

    return OPERATOR_FINISHED;
}

void VIEW3D_OT_view_pan(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "View Pan";
    ot->description = "Pan the view";
    ot->idname= "VIEW3D_OT_view_pan";

    /* api callbacks */
    ot->exec= viewpan_exec;
    ot->poll= ED_operator_region_view3d_active;

    /* flags */
    ot->flag= 0;
    RNA_def_enum(ot->srna, "type", prop_view_pan_items, 0, "Pan", "Direction of View Pan");
}

static int viewpersportho_exec(bContext *C, wmOperator *UNUSED(op))
{
    View3D *v3d_dummy;
    ARegion *ar;
    RegionView3D *rv3d;

    /* no NULL check is needed, poll checks */
    ED_view3d_context_user_region(C, &v3d_dummy, &ar);
    rv3d = ar->regiondata;

    if(rv3d->viewlock==0) {
        if(rv3d->persp!=RV3D_ORTHO)
            rv3d->persp=RV3D_ORTHO;
        else rv3d->persp=RV3D_PERSP;
        ED_region_tag_redraw(ar);
    }

    return OPERATOR_FINISHED;

}

void VIEW3D_OT_view_persportho(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "View Persp/Ortho";
    ot->description = "Switch the current view from perspective/orthographic";
    ot->idname= "VIEW3D_OT_view_persportho";

    /* api callbacks */
    ot->exec= viewpersportho_exec;
    ot->poll= ED_operator_rv3d_user_region_poll;

    /* flags */
    ot->flag= 0;
}


/* ******************** add background image operator **************** */

static BGpic *background_image_add(bContext *C)
{
    View3D *v3d= CTX_wm_view3d(C);

    return ED_view3D_background_image_new(v3d);
}

static int background_image_add_exec(bContext *C, wmOperator *UNUSED(op))
{
    background_image_add(C);

    return OPERATOR_FINISHED;
}

static int background_image_add_invoke(bContext *C, wmOperator *op, wmEvent *UNUSED(event))
{
    View3D *v3d= CTX_wm_view3d(C);
    Image *ima= NULL;
    BGpic *bgpic;
    char name[MAX_ID_NAME-2];
    
    /* check input variables */
    if(RNA_struct_property_is_set(op->ptr, "filepath")) {
        char path[FILE_MAX];
        
        RNA_string_get(op->ptr, "filepath", path);
        ima= BKE_add_image_file(path);
    }
    else if(RNA_struct_property_is_set(op->ptr, "name")) {
        RNA_string_get(op->ptr, "name", name);
        ima= (Image *)find_id("IM", name);
    }
    
    bgpic = background_image_add(C);
    
    if (ima) {
        bgpic->ima = ima;
        
        if(ima->id.us==0) id_us_plus(&ima->id);
        else id_lib_extern(&ima->id);
        
        if (!(v3d->flag & V3D_DISPBGPICS))
            v3d->flag |= V3D_DISPBGPICS;
    }
    
    WM_event_add_notifier(C, NC_SPACE|ND_SPACE_VIEW3D, v3d);
    
    return OPERATOR_FINISHED;
}

void VIEW3D_OT_background_image_add(wmOperatorType *ot)
{
    /* identifiers */
    ot->name   = "Add Background Image";
    ot->description= "Add a new background image";
    ot->idname = "VIEW3D_OT_background_image_add";

    /* api callbacks */
    ot->invoke = background_image_add_invoke;
    ot->exec   = background_image_add_exec;
    ot->poll   = ED_operator_view3d_active;

    /* flags */
    ot->flag   = 0;
    
    /* properties */
    RNA_def_string(ot->srna, "name", "Image", MAX_ID_NAME-2, "Name", "Image name to assign");
    RNA_def_string(ot->srna, "filepath", "Path", FILE_MAX, "Filepath", "Path to image file");
}


/* ***** remove image operator ******* */
static int background_image_remove_exec(bContext *C, wmOperator *op)
{
    View3D *v3d = CTX_wm_view3d(C);
    int index = RNA_int_get(op->ptr, "index");
    BGpic *bgpic_rem= BLI_findlink(&v3d->bgpicbase, index);

    if(bgpic_rem) {
        ED_view3D_background_image_remove(v3d, bgpic_rem);
        WM_event_add_notifier(C, NC_SPACE|ND_SPACE_VIEW3D, v3d);
        return OPERATOR_FINISHED;
    }
    else {
        return OPERATOR_CANCELLED;
    }

}

void VIEW3D_OT_background_image_remove(wmOperatorType *ot)
{
    /* identifiers */
    ot->name   = "Remove Background Image";
    ot->description= "Remove a background image from the 3D view";
    ot->idname = "VIEW3D_OT_background_image_remove";

    /* api callbacks */
    ot->exec   = background_image_remove_exec;
    ot->poll   = ED_operator_view3d_active;

    /* flags */
    ot->flag   = 0;

    RNA_def_int(ot->srna, "index", 0, 0, INT_MAX, "Index", "Background image index to remove ", 0, INT_MAX);
}

/* ********************* set clipping operator ****************** */

static void calc_clipping_plane(float clip[6][4], BoundBox *clipbb)
{
    int val;

    for(val=0; val<4; val++) {

        normal_tri_v3( clip[val],clipbb->vec[val], clipbb->vec[val==3?0:val+1], clipbb->vec[val+4]);

        clip[val][3]=
            - clip[val][0]*clipbb->vec[val][0]
            - clip[val][1]*clipbb->vec[val][1]
            - clip[val][2]*clipbb->vec[val][2];
    }
}

static void calc_local_clipping(float clip_local[][4], BoundBox *clipbb, float mat[][4])
{
    BoundBox clipbb_local;
    float imat[4][4];
    int i;

    invert_m4_m4(imat, mat);

    for(i=0; i<8; i++) {
        mul_v3_m4v3(clipbb_local.vec[i], imat, clipbb->vec[i]);
    }

    calc_clipping_plane(clip_local, &clipbb_local);
}

void ED_view3d_local_clipping(RegionView3D *rv3d, float mat[][4])
{
    if(rv3d->rflag & RV3D_CLIPPING)
        calc_local_clipping(rv3d->clip_local, rv3d->clipbb, mat);
}

static int view3d_clipping_exec(bContext *C, wmOperator *op)
{
    RegionView3D *rv3d= CTX_wm_region_view3d(C);
    ViewContext vc;
    bglMats mats;
    rcti rect;

    rect.xmin= RNA_int_get(op->ptr, "xmin");
    rect.ymin= RNA_int_get(op->ptr, "ymin");
    rect.xmax= RNA_int_get(op->ptr, "xmax");
    rect.ymax= RNA_int_get(op->ptr, "ymax");

    rv3d->rflag |= RV3D_CLIPPING;
    rv3d->clipbb= MEM_callocN(sizeof(BoundBox), "clipbb");

    /* note; otherwise opengl won't work */
    view3d_operator_needs_opengl(C);

    view3d_set_viewcontext(C, &vc);
    view3d_get_transformation(vc.ar, vc.rv3d, NULL, &mats); /* NULL because we don't want it in object space */
    ED_view3d_calc_clipping(rv3d->clipbb, rv3d->clip, &mats, &rect);

    return OPERATOR_FINISHED;
}

static int view3d_clipping_invoke(bContext *C, wmOperator *op, wmEvent *event)
{
    RegionView3D *rv3d= CTX_wm_region_view3d(C);
    ARegion *ar= CTX_wm_region(C);

    if(rv3d->rflag & RV3D_CLIPPING) {
        rv3d->rflag &= ~RV3D_CLIPPING;
        ED_region_tag_redraw(ar);
        if(rv3d->clipbb) MEM_freeN(rv3d->clipbb);
        rv3d->clipbb= NULL;
        return OPERATOR_FINISHED;
    }
    else {
        return WM_border_select_invoke(C, op, event);
    }
}

/* toggles */
void VIEW3D_OT_clip_border(wmOperatorType *ot)
{

    /* identifiers */
    ot->name= "Clipping Border";
    ot->description = "Set the view clipping border";
    ot->idname= "VIEW3D_OT_clip_border";

    /* api callbacks */
    ot->invoke= view3d_clipping_invoke;
    ot->exec= view3d_clipping_exec;
    ot->modal= WM_border_select_modal;
    ot->cancel= WM_border_select_cancel;

    ot->poll= ED_operator_region_view3d_active;

    /* flags */
    ot->flag= 0;

    /* rna */
    RNA_def_int(ot->srna, "xmin", 0, INT_MIN, INT_MAX, "X Min", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "xmax", 0, INT_MIN, INT_MAX, "X Max", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "ymin", 0, INT_MIN, INT_MAX, "Y Min", "", INT_MIN, INT_MAX);
    RNA_def_int(ot->srna, "ymax", 0, INT_MIN, INT_MAX, "Y Max", "", INT_MIN, INT_MAX);
}

/* ***************** 3d cursor cursor op ******************* */

/* mx my in region coords */
static int set_3dcursor_invoke(bContext *C, wmOperator *UNUSED(op), wmEvent *event)
{
    Scene *scene= CTX_data_scene(C);
    ARegion *ar= CTX_wm_region(C);
    View3D *v3d = CTX_wm_view3d(C);
    RegionView3D *rv3d= CTX_wm_region_view3d(C);
    float dx, dy, fz, *fp = NULL, dvec[3], oldcurs[3];
    int mval[2];
//  short ctrl= 0; // XXX
    int flip;
    fp= give_cursor(scene, v3d);

//  if(obedit && ctrl) lr_click= 1;
    copy_v3_v3(oldcurs, fp);

    project_int_noclip(ar, fp, mval);
    flip= initgrabz(rv3d, fp[0], fp[1], fp[2]);
    
    /* reset the depth based on the view offset */
    if(flip) {
        negate_v3_v3(fp, rv3d->ofs);

        /* re initialize */
        project_int_noclip(ar, fp, mval);
        flip= initgrabz(rv3d, fp[0], fp[1], fp[2]);
    }

    if(mval[0]!=IS_CLIPPED) {
        short depth_used = 0;

        if (U.uiflag & USER_ORBIT_ZBUF) { /* maybe this should be accessed some other way */
            view3d_operator_needs_opengl(C);
            if (ED_view3d_autodist(scene, ar, v3d, event->mval, fp))
                depth_used= 1;
        }

        if(depth_used==0) {
            float mval_f[2];
            VECSUB2D(mval_f, mval, event->mval);
            ED_view3d_win_to_delta(ar, mval_f, dvec);
            sub_v3_v3(fp, dvec);
        }
    }
    else {

        dx= ((float)(event->mval[0]-(ar->winx/2)))*rv3d->zfac/(ar->winx/2);
        dy= ((float)(event->mval[1]-(ar->winy/2)))*rv3d->zfac/(ar->winy/2);

        fz= rv3d->persmat[0][3]*fp[0]+ rv3d->persmat[1][3]*fp[1]+ rv3d->persmat[2][3]*fp[2]+ rv3d->persmat[3][3];
        fz= fz/rv3d->zfac;

        fp[0]= (rv3d->persinv[0][0]*dx + rv3d->persinv[1][0]*dy+ rv3d->persinv[2][0]*fz)-rv3d->ofs[0];
        fp[1]= (rv3d->persinv[0][1]*dx + rv3d->persinv[1][1]*dy+ rv3d->persinv[2][1]*fz)-rv3d->ofs[1];
        fp[2]= (rv3d->persinv[0][2]*dx + rv3d->persinv[1][2]*dy+ rv3d->persinv[2][2]*fz)-rv3d->ofs[2];
    }

    if(v3d && v3d->localvd)
        WM_event_add_notifier(C, NC_SPACE|ND_SPACE_VIEW3D, v3d);
    else
        WM_event_add_notifier(C, NC_SCENE|NA_EDITED, scene);

    return OPERATOR_FINISHED;
}

void VIEW3D_OT_cursor3d(wmOperatorType *ot)
{

    /* identifiers */
    ot->name= "Set 3D Cursor";
    ot->description = "Set the location of the 3D cursor";
    ot->idname= "VIEW3D_OT_cursor3d";

    /* api callbacks */
    ot->invoke= set_3dcursor_invoke;

    ot->poll= ED_operator_view3d_active;

    /* flags */
//  ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;

    /* rna later */

}

/* ***************** manipulator op ******************* */


static int manipulator_invoke(bContext *C, wmOperator *op, wmEvent *event)
{
    View3D *v3d = CTX_wm_view3d(C);

    if(!(v3d->twflag & V3D_USE_MANIPULATOR)) return OPERATOR_PASS_THROUGH;
    if(!(v3d->twflag & V3D_DRAW_MANIPULATOR)) return OPERATOR_PASS_THROUGH;

    /* only no modifier or shift */
    if(event->keymodifier != 0 && event->keymodifier != KM_SHIFT) return OPERATOR_PASS_THROUGH;

    /* note; otherwise opengl won't work */
    view3d_operator_needs_opengl(C);

    if(0==BIF_do_manipulator(C, event, op))
        return OPERATOR_PASS_THROUGH;

    return OPERATOR_FINISHED;
}

void VIEW3D_OT_manipulator(wmOperatorType *ot)
{

    /* identifiers */
    ot->name= "3D Manipulator";
    ot->description = "Manipulate selected item by axis";
    ot->idname= "VIEW3D_OT_manipulator";

    /* api callbacks */
    ot->invoke= manipulator_invoke;

    ot->poll= ED_operator_view3d_active;

    /* properties to pass to transform */
    Transform_Properties(ot, P_CONSTRAINT);
}

static int enable_manipulator_invoke(bContext *C, wmOperator *op, wmEvent *UNUSED(event))
{
    View3D *v3d = CTX_wm_view3d(C);

    v3d->twtype=0;
    
    if (RNA_boolean_get(op->ptr, "translate"))
        v3d->twtype |= V3D_MANIP_TRANSLATE;
    if (RNA_boolean_get(op->ptr, "rotate"))
        v3d->twtype |= V3D_MANIP_ROTATE;
    if (RNA_boolean_get(op->ptr, "scale"))
        v3d->twtype |= V3D_MANIP_SCALE;
        
    WM_event_add_notifier(C, NC_SPACE|ND_SPACE_VIEW3D, v3d);

    return OPERATOR_FINISHED;
}

void VIEW3D_OT_enable_manipulator(wmOperatorType *ot)
{
    /* identifiers */
    ot->name= "Enable 3D Manipulator";
    ot->description = "Enable the transform manipulator for use";
    ot->idname= "VIEW3D_OT_enable_manipulator";
    
    /* api callbacks */
    ot->invoke= enable_manipulator_invoke;
    ot->poll= ED_operator_view3d_active;
    
    /* rna later */
    RNA_def_boolean(ot->srna, "translate", 0, "Translate", "Enable the translate manipulator");
    RNA_def_boolean(ot->srna, "rotate", 0, "Rotate", "Enable the rotate manipulator");
    RNA_def_boolean(ot->srna, "scale", 0, "Scale", "Enable the scale manipulator");
}

/* ************************* below the line! *********************** */


static float view_autodist_depth_margin(ARegion *ar, const int mval[2], int margin)
{
    ViewDepths depth_temp= {0};
    rcti rect;
    float depth_close;

    if(margin==0) {
        /* Get Z Depths, needed for perspective, nice for ortho */
        rect.xmin= mval[0];
        rect.ymin= mval[1];
        rect.xmax= mval[0] + 1;
        rect.ymax= mval[1] + 1;
    }
    else {
        rect.xmax = mval[0] + margin;
        rect.ymax = mval[1] + margin;

        rect.xmin = mval[0] - margin;
        rect.ymin = mval[1] - margin;
    }

    view3d_update_depths_rect(ar, &depth_temp, &rect);
    depth_close= view3d_depth_near(&depth_temp);
    if(depth_temp.depths) MEM_freeN(depth_temp.depths);
    return depth_close;
}

/* XXX todo Zooms in on a border drawn by the user */
int ED_view3d_autodist(Scene *scene, ARegion *ar, View3D *v3d, const int mval[2], float mouse_worldloc[3] ) //, float *autodist )
{
    bglMats mats; /* ZBuffer depth vars */
    float depth_close= FLT_MAX;
    double cent[2],  p[3];

    /* Get Z Depths, needed for perspective, nice for ortho */
    bgl_get_mats(&mats);
    draw_depth(scene, ar, v3d, NULL);

    depth_close= view_autodist_depth_margin(ar, mval, 4);

    if (depth_close==FLT_MAX)
        return 0;

    cent[0] = (double)mval[0];
    cent[1] = (double)mval[1];

    if (!gluUnProject(cent[0], cent[1], depth_close, mats.modelview, mats.projection, (GLint *)mats.viewport, &p[0], &p[1], &p[2]))
        return 0;

    mouse_worldloc[0] = (float)p[0];
    mouse_worldloc[1] = (float)p[1];
    mouse_worldloc[2] = (float)p[2];
    return 1;
}

int ED_view3d_autodist_init(Scene *scene, ARegion *ar, View3D *v3d, int mode) //, float *autodist )
{
    /* Get Z Depths, needed for perspective, nice for ortho */
    switch(mode) {
    case 0:
        draw_depth(scene, ar, v3d, NULL);
        break;
    case 1:
        draw_depth_gpencil(scene, ar, v3d);
        break;
    }

    return 1;
}

// no 4x4 sampling, run view_autodist_init first
int ED_view3d_autodist_simple(ARegion *ar, const int mval[2], float mouse_worldloc[3], int margin, float *force_depth) //, float *autodist )
{
    bglMats mats; /* ZBuffer depth vars, could cache? */
    float depth;
    double cent[2],  p[3];

    /* Get Z Depths, needed for perspective, nice for ortho */
    if(force_depth)
        depth= *force_depth;
    else
        depth= view_autodist_depth_margin(ar, mval, margin);

    if (depth==FLT_MAX)
        return 0;

    cent[0] = (double)mval[0];
    cent[1] = (double)mval[1];

    bgl_get_mats(&mats);
    if (!gluUnProject(cent[0], cent[1], depth, mats.modelview, mats.projection, (GLint *)mats.viewport, &p[0], &p[1], &p[2]))
        return 0;

    mouse_worldloc[0] = (float)p[0];
    mouse_worldloc[1] = (float)p[1];
    mouse_worldloc[2] = (float)p[2];
    return 1;
}

int ED_view3d_autodist_depth(struct ARegion *ar, const int mval[2], int margin, float *depth)
{
    *depth= view_autodist_depth_margin(ar, mval, margin);

    return (*depth==FLT_MAX) ? 0:1;
}

static int depth_segment_cb(int x, int y, void *userData)
{
    struct { struct ARegion *ar; int margin; float depth; } *data = userData;
    int mval[2];
    float depth;

    mval[0]= x;
    mval[1]= y;

    depth= view_autodist_depth_margin(data->ar, mval, data->margin);

    if(depth != FLT_MAX) {
        data->depth= depth;
        return 0;
    }
    else {
        return 1;
    }
}

int ED_view3d_autodist_depth_seg(struct ARegion *ar, const int mval_sta[2], const int mval_end[2], int margin, float *depth)
{
    struct { struct ARegion *ar; int margin; float depth; } data = {NULL};
    int p1[2];
    int p2[2];

    data.ar= ar;
    data.margin= margin;
    data.depth= FLT_MAX;

    copy_v2_v2_int(p1, mval_sta);
    copy_v2_v2_int(p2, mval_end);

    plot_line_v2v2i(p1, p2, depth_segment_cb, &data);

    *depth= data.depth;

    return (*depth==FLT_MAX) ? 0:1;
}

/* Gets the view trasnformation from a camera
* currently dosnt take camzoom into account
*
* The dist is not modified for this function, if NULL its assimed zero
* */
void ED_view3d_from_m4(float mat[][4], float ofs[3], float quat[4], float *dist)
{
    /* Offset */
    if (ofs)
        negate_v3_v3(ofs, mat[3]);

    /* Quat */
    if (quat) {
        float imat[4][4];
        invert_m4_m4(imat, mat);
        mat4_to_quat(quat, imat);
    }

    if (dist) {
        float nmat[3][3];
        float vec[3];

        vec[0]= 0.0f;
        vec[1]= 0.0f;
        vec[2]= -(*dist);

        copy_m3_m4(nmat, mat);
        normalize_m3(nmat);

        mul_m3_v3(nmat, vec);
        sub_v3_v3(ofs, vec);
    }
}

void ED_view3d_to_m4(float mat[][4], const float ofs[3], const float quat[4], const float dist)
{
    float iviewquat[4]= {-quat[0], quat[1], quat[2], quat[3]};
    float dvec[3]= {0.0f, 0.0f, dist};

    quat_to_mat4(mat, iviewquat);
    mul_mat3_m4_v3(mat, dvec);
    sub_v3_v3v3(mat[3], dvec, ofs);
}


/* object -> view */
void ED_view3d_from_object(Object *ob, float ofs[3], float quat[4], float *dist, float *lens)
{
    ED_view3d_from_m4(ob->obmat, ofs, quat, dist);

    if(lens) {
        CameraParams params;

        camera_params_init(&params);
        camera_params_from_object(&params, ob);
        *lens= params.lens;
    }
}

/* view -> object */
void ED_view3d_to_object(Object *ob, const float ofs[3], const float quat[4], const float dist)
{
    float mat[4][4];
    ED_view3d_to_m4(mat, ofs, quat, dist);
    object_apply_mat4(ob, mat, TRUE, TRUE);
}

BGpic *ED_view3D_background_image_new(View3D *v3d)
{
    BGpic *bgpic= MEM_callocN(sizeof(BGpic), "Background Image");

    bgpic->size= 5.0;
    bgpic->blend= 0.5;
    bgpic->iuser.fie_ima= 2;
    bgpic->iuser.ok= 1;
    bgpic->view= 0; /* 0 for all */
    bgpic->flag |= V3D_BGPIC_EXPANDED;

    BLI_addtail(&v3d->bgpicbase, bgpic);

    return bgpic;
}

void ED_view3D_background_image_remove(View3D *v3d, BGpic *bgpic)
{
    BLI_remlink(&v3d->bgpicbase, bgpic);

    if(bgpic->ima)
        id_us_min(&bgpic->ima->id);

    if(bgpic->clip)
        id_us_min(&bgpic->clip->id);

    MEM_freeN(bgpic);
}

void ED_view3D_background_image_clear(View3D *v3d)
{
    BGpic *bgpic= v3d->bgpicbase.first;

    while(bgpic) {
        BGpic *next_bgpic= bgpic->next;

        ED_view3D_background_image_remove(v3d, bgpic);

        bgpic= next_bgpic;
    }
}