GD/GD_TrimQuadTree.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Jeff Lait
 *      Side Effects Software Inc.
 *      477 Richmond Street West
 *      Toronto, Ontario  
 *      Canada   M5V 3E7
 *      416-504-9876      
 *
 * NAME:        Geometry Library (C++)
 *
 * COMMENTS:
 *      This class handles trimming loops.  Each loop is a series of
 * bezier segments which in totality is closed.  Loops themselves
 * are embedded in a linked list of loops.
 * 
 */

#ifndef __GD_TrimQuadTree_h__
#define __GD_TrimQuadTree_h__

#include "GD_API.h"
#include <UT/UT_Defines.h>

class UT_Vector2;
class UT_BoundingRect;
class GD_TrimLoop;
class GD_TrimQuadBaseNode;

class GD_API GD_TrimQuadTree {
public:
        GD_TrimQuadTree(const GD_TrimLoop &loops, const UT_BoundingRect &rect);
        ~GD_TrimQuadTree();

        // When querying whether a region is entirely inside or outside, the
        // following enum is used.  Out means that the region is entirely
        // trimmed out.  In means that there are no trim curves on the interior
        // of the region.  Mix means that there are trim curves which pass
        // through the region.
        enum    GD_TrimState    { GD_TRIM_OUT, GD_TRIM_IN, GD_TRIM_MIX };

        // Not const as updates cache:
        int     isTrimmedIn(const UT_Vector2 &pt);
        int     isTrimmedIn(float u, float v);

        // This also updates the cache.  It's a quick check to see if a whole
        // region is trimmed out.  It's only reasonably accurate though.
        GD_TrimState    isTrimmedOut(const UT_BoundingRect &rect);
        GD_TrimState    isTrimmedOut(float u0, float u1, float v0, float v1);

private:
        float   myUStart, myULength, myUConversion;
        float   myVStart, myVLength, myVConversion;
        GD_TrimQuadBaseNode     *myNodes;
        GD_TrimQuadBaseNode     *myCachedNode;
        GD_TrimLoop             *myLoops;
};

#endif

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