GHOST_Rect.cpp

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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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "GHOST_Rect.h"



void GHOST_Rect::inset(GHOST_TInt32 i)
{
    if (i > 0) {
        // Grow the rectangle
        m_l -= i;
        m_r += i;
        m_t -= i;
        m_b += i;
    }
    else if (i < 0) {
        // Shrink the rectangle, check for insets larger than half the size
        GHOST_TInt32 i2 = i * 2;
        if (getWidth() > i2) {
            m_l += i;
            m_r -= i;
        }
        else {
            m_l = m_l + ((m_r - m_l) / 2);
            m_r = m_l;
        }
        if (getHeight() > i2) {
            m_t += i;
            m_b -= i;
        }
        else {
            m_t = m_t + ((m_b - m_t) / 2);
            m_b = m_t;
        }
    }
}


GHOST_TVisibility GHOST_Rect::getVisibility(GHOST_Rect& r) const
{
    bool lt = isInside(r.m_l, r.m_t);
    bool rt = isInside(r.m_r, r.m_t);
    bool lb = isInside(r.m_l, r.m_b);
    bool rb = isInside(r.m_r, r.m_b);
    GHOST_TVisibility v;
    if (lt && rt && lb && rb) {
        // All points inside, rectangle is inside this
        v = GHOST_kFullyVisible;        
    }
    else if (!(lt || rt || lb || rb)) {
        // None of the points inside
        // Check to see whether the rectangle is larger than this one
        if ((r.m_l < m_l) && (r.m_t < m_t) && (r.m_r > m_r) && (r.m_b > m_b)) {
            v = GHOST_kPartiallyVisible;
        }
        else {
            v = GHOST_kNotVisible;
        }
    }
    else {
        // Some of the points inside, rectangle is partially inside
        v = GHOST_kPartiallyVisible;
    }
    return v;
}


void GHOST_Rect::setCenter(GHOST_TInt32 cx, GHOST_TInt32 cy)
{
    GHOST_TInt32 offset = cx - (m_l + (m_r - m_l)/2);
    m_l += offset;
    m_r += offset;
    offset = cy - (m_t + (m_b - m_t)/2);
    m_t += offset;
    m_b += offset;
}

void GHOST_Rect::setCenter(GHOST_TInt32 cx, GHOST_TInt32 cy, GHOST_TInt32 w, GHOST_TInt32 h)
{
    long w_2, h_2;
    
    w_2 = w >> 1;
    h_2 = h >> 1;
    m_l = cx - w_2;
    m_t = cy - h_2;
    m_r = m_l + w;
    m_b = m_t + h;
}

bool GHOST_Rect::clip(GHOST_Rect& r) const
{
    bool clipped = false;
    if (r.m_l < m_l) {
        r.m_l = m_l;
        clipped = true;
    }
    if (r.m_t < m_t) {
        r.m_t = m_t;
        clipped = true;
    }
    if (r.m_r > m_r) {
        r.m_r = m_r;
        clipped = true;
    }
    if (r.m_b > m_b) {
        r.m_b = m_b;
        clipped = true;
    }
    return clipped;
}