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diff --git a/polygon/poly2tri/common/shapes.cc b/polygon/poly2tri/common/shapes.cc
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+++ b/polygon/poly2tri/common/shapes.cc
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+/*
+ * Poly2Tri Copyright (c) 2009-2010, Poly2Tri Contributors
+ * http://code.google.com/p/poly2tri/
+ *
+ * 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.
+ * * Neither the name of Poly2Tri nor the names of its contributors may be
+ *   used to endorse or promote products derived from this software without specific
+ *   prior written permission.
+ *
+ * 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 OWNER 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.
+ */
+#include "shapes.h"
+#include <iostream>
+
+namespace p2t {
+Triangle::Triangle( Point& a, Point& b, Point& c )
+{
+    points_[0]      = &a; points_[1] = &b; points_[2] = &c;
+    neighbors_[0]   = NULL; neighbors_[1] = NULL; neighbors_[2] = NULL;
+    constrained_edge[0] = constrained_edge[1] = constrained_edge[2] = false;
+    delaunay_edge[0]    = delaunay_edge[1] = delaunay_edge[2] = false;
+    interior_ = false;
+}
+
+
+// Update neighbor pointers
+void Triangle::MarkNeighbor( Point* p1, Point* p2, Triangle* t )
+{
+    if( (p1 == points_[2] && p2 == points_[1]) || (p1 == points_[1] && p2 == points_[2]) )
+        neighbors_[0] = t;
+    else if( (p1 == points_[0] && p2 == points_[2]) || (p1 == points_[2] && p2 == points_[0]) )
+        neighbors_[1] = t;
+    else if( (p1 == points_[0] && p2 == points_[1]) || (p1 == points_[1] && p2 == points_[0]) )
+        neighbors_[2] = t;
+    else
+        assert( 0 );
+}
+
+
+// Exhaustive search to update neighbor pointers
+void Triangle::MarkNeighbor( Triangle& t )
+{
+    if( t.Contains( points_[1], points_[2] ) )
+    {
+        neighbors_[0] = &t;
+        t.MarkNeighbor( points_[1], points_[2], this );
+    }
+    else if( t.Contains( points_[0], points_[2] ) )
+    {
+        neighbors_[1] = &t;
+        t.MarkNeighbor( points_[0], points_[2], this );
+    }
+    else if( t.Contains( points_[0], points_[1] ) )
+    {
+        neighbors_[2] = &t;
+        t.MarkNeighbor( points_[0], points_[1], this );
+    }
+}
+
+
+/**
+ * Clears all references to all other triangles and points
+ */
+void Triangle::Clear()
+{
+    Triangle* t;
+
+    for( int i = 0; i<3; i++ )
+    {
+        t = neighbors_[i];
+
+        if( t != NULL )
+        {
+            t->ClearNeighbor( this );
+        }
+    }
+
+    ClearNeighbors();
+    points_[0] = points_[1] = points_[2] = NULL;
+}
+
+
+void Triangle::ClearNeighbor( Triangle* triangle )
+{
+    if( neighbors_[0] == triangle )
+    {
+        neighbors_[0] = NULL;
+    }
+    else if( neighbors_[1] == triangle )
+    {
+        neighbors_[1] = NULL;
+    }
+    else
+    {
+        neighbors_[2] = NULL;
+    }
+}
+
+
+void Triangle::ClearNeighbors()
+{
+    neighbors_[0]   = NULL;
+    neighbors_[1]   = NULL;
+    neighbors_[2]   = NULL;
+}
+
+
+void Triangle::ClearDelunayEdges()
+{
+    delaunay_edge[0] = delaunay_edge[1] = delaunay_edge[2] = false;
+}
+
+
+Point* Triangle::OppositePoint( Triangle& t, Point& p )
+{
+    Point*  cw  = t.PointCW( p );
+
+    /*
+    double  x   = cw->x;
+    double  y   = cw->y;
+
+    x   = p.x;
+    y   = p.y;
+    */
+
+    return PointCW( *cw );
+}
+
+
+// Legalized triangle by rotating clockwise around point(0)
+void Triangle::Legalize( Point& point )
+{
+    points_[1]  = points_[0];
+    points_[0]  = points_[2];
+    points_[2]  = &point;
+}
+
+
+// Legalize triagnle by rotating clockwise around oPoint
+void Triangle::Legalize( Point& opoint, Point& npoint )
+{
+    if( &opoint == points_[0] )
+    {
+        points_[1]  = points_[0];
+        points_[0]  = points_[2];
+        points_[2]  = &npoint;
+    }
+    else if( &opoint == points_[1] )
+    {
+        points_[2]  = points_[1];
+        points_[1]  = points_[0];
+        points_[0]  = &npoint;
+    }
+    else if( &opoint == points_[2] )
+    {
+        points_[0]  = points_[2];
+        points_[2]  = points_[1];
+        points_[1]  = &npoint;
+    }
+    else
+    {
+        assert( 0 );
+    }
+}
+
+
+int Triangle::Index( const Point* p )
+{
+    if( p == points_[0] )
+    {
+        return 0;
+    }
+    else if( p == points_[1] )
+    {
+        return 1;
+    }
+    else if( p == points_[2] )
+    {
+        return 2;
+    }
+
+    assert( 0 );
+    return 0;           // you better hope its a Debug build.
+}
+
+
+int Triangle::EdgeIndex( const Point* p1, const Point* p2 )
+{
+    if( points_[0] == p1 )
+    {
+        if( points_[1] == p2 )
+        {
+            return 2;
+        }
+        else if( points_[2] == p2 )
+        {
+            return 1;
+        }
+    }
+    else if( points_[1] == p1 )
+    {
+        if( points_[2] == p2 )
+        {
+            return 0;
+        }
+        else if( points_[0] == p2 )
+        {
+            return 2;
+        }
+    }
+    else if( points_[2] == p1 )
+    {
+        if( points_[0] == p2 )
+        {
+            return 1;
+        }
+        else if( points_[1] == p2 )
+        {
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+
+void Triangle::MarkConstrainedEdge( const int index )
+{
+    constrained_edge[index] = true;
+}
+
+
+void Triangle::MarkConstrainedEdge( Edge& edge )
+{
+    MarkConstrainedEdge( edge.p, edge.q );
+}
+
+
+// Mark edge as constrained
+void Triangle::MarkConstrainedEdge( Point* p, Point* q )
+{
+    if( (q == points_[0] && p == points_[1]) || (q == points_[1] && p == points_[0]) )
+    {
+        constrained_edge[2] = true;
+    }
+    else if( (q == points_[0] && p == points_[2]) || (q == points_[2] && p == points_[0]) )
+    {
+        constrained_edge[1] = true;
+    }
+    else if( (q == points_[1] && p == points_[2]) || (q == points_[2] && p == points_[1]) )
+    {
+        constrained_edge[0] = true;
+    }
+}
+
+
+// The point counter-clockwise to given point
+Point* Triangle::PointCW( Point& point )
+{
+    if( &point == points_[0] )
+    {
+        return points_[2];
+    }
+    else if( &point == points_[1] )
+    {
+        return points_[0];
+    }
+    else if( &point == points_[2] )
+    {
+        return points_[1];
+    }
+
+    assert( 0 );
+    return NULL;    // you better hope its a Debug build.
+}
+
+
+// The point counter-clockwise to given point
+Point* Triangle::PointCCW( Point& point )
+{
+    if( &point == points_[0] )
+    {
+        return points_[1];
+    }
+    else if( &point == points_[1] )
+    {
+        return points_[2];
+    }
+    else if( &point == points_[2] )
+    {
+        return points_[0];
+    }
+
+    assert( 0 );
+    return NULL;    // you better hope its a Debug build.
+}
+
+
+// The neighbor clockwise to given point
+Triangle* Triangle::NeighborCW( Point& point )
+{
+    if( &point == points_[0] )
+    {
+        return neighbors_[1];
+    }
+    else if( &point == points_[1] )
+    {
+        return neighbors_[2];
+    }
+
+    return neighbors_[0];
+}
+
+
+// The neighbor counter-clockwise to given point
+Triangle* Triangle::NeighborCCW( Point& point )
+{
+    if( &point == points_[0] )
+    {
+        return neighbors_[2];
+    }
+    else if( &point == points_[1] )
+    {
+        return neighbors_[0];
+    }
+
+    return neighbors_[1];
+}
+
+
+bool Triangle::GetConstrainedEdgeCCW( Point& p )
+{
+    if( &p == points_[0] )
+    {
+        return constrained_edge[2];
+    }
+    else if( &p == points_[1] )
+    {
+        return constrained_edge[0];
+    }
+
+    return constrained_edge[1];
+}
+
+
+bool Triangle::GetConstrainedEdgeCW( Point& p )
+{
+    if( &p == points_[0] )
+    {
+        return constrained_edge[1];
+    }
+    else if( &p == points_[1] )
+    {
+        return constrained_edge[2];
+    }
+
+    return constrained_edge[0];
+}
+
+
+void Triangle::SetConstrainedEdgeCCW( Point& p, bool ce )
+{
+    if( &p == points_[0] )
+    {
+        constrained_edge[2] = ce;
+    }
+    else if( &p == points_[1] )
+    {
+        constrained_edge[0] = ce;
+    }
+    else
+    {
+        constrained_edge[1] = ce;
+    }
+}
+
+
+void Triangle::SetConstrainedEdgeCW( Point& p, bool ce )
+{
+    if( &p == points_[0] )
+    {
+        constrained_edge[1] = ce;
+    }
+    else if( &p == points_[1] )
+    {
+        constrained_edge[2] = ce;
+    }
+    else
+    {
+        constrained_edge[0] = ce;
+    }
+}
+
+
+bool Triangle::GetDelunayEdgeCCW( Point& p )
+{
+    if( &p == points_[0] )
+    {
+        return delaunay_edge[2];
+    }
+    else if( &p == points_[1] )
+    {
+        return delaunay_edge[0];
+    }
+
+    return delaunay_edge[1];
+}
+
+
+bool Triangle::GetDelunayEdgeCW( Point& p )
+{
+    if( &p == points_[0] )
+    {
+        return delaunay_edge[1];
+    }
+    else if( &p == points_[1] )
+    {
+        return delaunay_edge[2];
+    }
+
+    return delaunay_edge[0];
+}
+
+
+void Triangle::SetDelunayEdgeCCW( Point& p, bool e )
+{
+    if( &p == points_[0] )
+    {
+        delaunay_edge[2] = e;
+    }
+    else if( &p == points_[1] )
+    {
+        delaunay_edge[0] = e;
+    }
+    else
+    {
+        delaunay_edge[1] = e;
+    }
+}
+
+
+void Triangle::SetDelunayEdgeCW( Point& p, bool e )
+{
+    if( &p == points_[0] )
+    {
+        delaunay_edge[1] = e;
+    }
+    else if( &p == points_[1] )
+    {
+        delaunay_edge[2] = e;
+    }
+    else
+    {
+        delaunay_edge[0] = e;
+    }
+}
+
+
+// The neighbor across to given point
+Triangle& Triangle::NeighborAcross( Point& opoint )
+{
+    if( &opoint == points_[0] )
+    {
+        return *neighbors_[0];
+    }
+    else if( &opoint == points_[1] )
+    {
+        return *neighbors_[1];
+    }
+
+    return *neighbors_[2];
+}
+
+
+void Triangle::DebugPrint()
+{
+    std::cout << points_[0]->x << "," << points_[0]->y << " ";
+    std::cout << points_[1]->x << "," << points_[1]->y << " ";
+    std::cout << points_[2]->x << "," << points_[2]->y << "\n";
+}
+}