subd_face.h

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/*
 * Original code in the public domain -- castanyo@yahoo.es
 * 
 * Modifications copyright (c) 2011, Blender Foundation.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __SUBD_FACE_H__
#define __SUBD_FACE_H__

#include "subd_edge.h"
#include "subd_mesh.h"

CCL_NAMESPACE_BEGIN

/* Subd Face */

class SubdFace
{
public:
    int id;
    SubdEdge *edge;

    SubdFace(int id_)
    {
        id = id_;
        edge = NULL;
    }

    bool contains(SubdEdge *e)
    {
        for(EdgeIterator it(edges()); !it.isDone(); it.advance())
            if(it.current() == e)
                return true;

        return false;
    }

    int num_edges()
    {
        int num = 0;

        for(EdgeIterator it(edges()); !it.isDone(); it.advance())
            num++;

        return num;
    }

    bool is_boundary()
    {
        for(EdgeIterator it(edges()); !it.isDone(); it.advance()) {
            SubdEdge *edge = it.current();

            if(edge->pair->face == NULL)
                return true;
        }

        return false;
    }
    
    /* iterate over edges in clockwise order */
    class EdgeIterator
    {
    public:
        EdgeIterator(SubdEdge *e) : end(NULL), cur(e) { }

        virtual void advance()
        {
            if (end == NULL) end = cur;
            cur = cur->next;
        }

        virtual bool isDone() { return end == cur; }
        virtual SubdEdge *current() { return cur; }

    private:
        SubdEdge *end;
        SubdEdge *cur;
    };

    EdgeIterator edges() { return EdgeIterator(edge); }
    EdgeIterator edges(SubdEdge *edge) {  return EdgeIterator(edge);  }
};

CCL_NAMESPACE_END

#endif /* __SUBD_FACE_H__ */