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SbTesselator.h

00001 /**************************************************************************\ 00002 * 00003 * This file is part of the Coin 3D visualization library. 00004 * Copyright (C) 1998-2003 by Systems in Motion. All rights reserved. 00005 * 00006 * This library is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public License 00008 * version 2.1 as published by the Free Software Foundation. See the 00009 * file LICENSE.LGPL at the root directory of the distribution for 00010 * more details. 00011 * 00012 * If you want to use Coin for applications not compatible with the 00013 * LGPL, please contact SIM to acquire a Professional Edition license. 00014 * 00015 * Systems in Motion, Teknobyen, Abels Gate 5, 7030 Trondheim, NORWAY 00016 * http://www.sim.no support@sim.no Voice: +47 22114160 Fax: +47 22207097 00017 * 00018 \**************************************************************************/ 00019 00020 #ifndef COIN_SBTESSELATOR_H 00021 #define COIN_SBTESSELATOR_H 00022 00023 #include <Inventor/SbBasic.h> 00024 #include <Inventor/lists/SbList.h> 00025 #include <Inventor/SbVec3f.h> 00026 #include <stddef.h> 00027 00028 struct SbTVertex; 00029 class SbHeap; 00030 class SbVec3f; 00031 00032 class COIN_DLL_API SbTesselator { 00033 public: 00034 SbTesselator(void (*callback)(void * v0, void * v1, void * v2, 00035 void * data) = NULL, void * userdata = NULL); 00036 ~SbTesselator(void); 00037 00038 void beginPolygon(SbBool keepVertices = FALSE, 00039 const SbVec3f & normal = SbVec3f(0.0f, 0.0f, 0.0f)); 00040 void addVertex(const SbVec3f &v, void *data); 00041 void endPolygon(void); 00042 void setCallback(void (*callback)(void *v0, void *v1, void *v2, void *data), 00043 void *data); 00044 00045 private: 00046 struct SbTVertex *newVertex(void); 00047 void cleanUp(void); 00048 00049 int currVertex; 00050 SbList <struct SbTVertex*> vertexStorage; 00051 SbHeap *heap; 00052 00053 SbTVertex *headV,*tailV; 00054 int numVerts; 00055 SbVec3f polyNormal; 00056 int X,Y; 00057 int polyDir; 00058 void (*callback)(void *v0,void *v1,void *v2,void *data); 00059 void *callbackData; 00060 SbBool hasNormal; 00061 SbBool keepVertices; 00062 00063 void emitTriangle(SbTVertex *v); 00064 void cutTriangle(SbTVertex *t); 00065 void calcPolygonNormal(void); 00066 00067 SbBool circleCenter(const SbVec3f &a, const SbVec3f &b, 00068 const SbVec3f &c, float &cx, float &cy); 00069 float circleSize(const SbVec3f &a, const SbVec3f &b, const SbVec3f &c); 00070 float circleSize(SbTVertex *v); 00071 float dot2D(const SbVec3f &v1, const SbVec3f &v2); 00072 SbBool clippable(SbTVertex *v); 00073 SbBool isTriangle(SbTVertex *v); 00074 SbBool pointInTriangle(SbTVertex *p,SbTVertex *t); 00075 float area(SbTVertex *t); 00076 00077 static float heap_evaluate(void *v); 00078 }; 00079 00080 #endif // COIN_SBTESSELATOR_H

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