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134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
/*
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* Copyright (c) 2007 Eric Jordan
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef B2_POLYGON_H
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#define B2_POLYGON_H
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#include "b2Triangle.h"
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#include "stdio.h"
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#include <string.h>
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#include <limits.h>
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namespace b2ConvexDecomp {
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static bool B2_POLYGON_REPORT_ERRORS = false;
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class b2Polygon;
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int32 remainder(int32 x, int32 modulus);
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int32 TriangulatePolygon(float32* xv, float32* yv, int32 vNum, b2Triangle* results);
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bool IsEar(int32 i, float32* xv, float32* yv, int32 xvLength); //Not for external use
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int32 PolygonizeTriangles(b2Triangle* triangulated, int32 triangulatedLength, b2Polygon* polys, int32 polysLength);
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int32 DecomposeConvex(b2Polygon* p, b2Polygon* results, int32 maxPolys);
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//void DecomposeConvexAndAddTo(b2Polygon* p, b2Body* bd, b2FixtureDef* prototype);
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void ReversePolygon(float32* x, float32* y, int n);
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b2Polygon TraceEdge(b2Polygon* p); //For use with self-intersecting polygons, finds outline
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class b2Polygon {
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public:
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const static int32 maxVerticesPerPolygon = b2_maxPolygonVertices;
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float32* x; //vertex arrays
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float32* y;
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int32 nVertices;
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float32 area;
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bool areaIsSet;
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b2Polygon(float32* _x, float32* _y, int32 nVert);
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b2Polygon(b2Vec2* v, int32 nVert);
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b2Polygon();
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~b2Polygon();
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float32 GetArea();
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void MergeParallelEdges(float32 tolerance);
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b2Vec2* GetVertexVecs();
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b2Polygon(b2Triangle& t);
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void Set(const b2Polygon& p);
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bool IsConvex();
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bool IsCCW();
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bool IsUsable(bool printError);
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bool IsUsable();
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bool IsSimple();
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// void AddTo(b2FixtureDef& pd);
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b2Polygon* Add(b2Triangle& t);
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void print(){
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printFormatted();
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/*
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for (int32 i=0; i<nVertices; ++i){
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printf("i: %d, x:%f, y:%f\n",i,x[i],y[i]);
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}
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*/
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}
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void printFormatted(){
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printf("float xv[] = {");
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for (int32 i=0; i<nVertices; ++i){
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printf("%ff,",x[i]);
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}
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printf("};\nfloat yv[] = {");
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for (int32 i=0; i<nVertices; ++i){
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printf("%ff,",y[i]);
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}
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printf("};\n");
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}
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b2Polygon(const b2Polygon& p){
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nVertices = p.nVertices;
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area = p.area;
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areaIsSet = p.areaIsSet;
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x = new float32[nVertices];
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y = new float32[nVertices];
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memcpy(x, p.x, nVertices * sizeof(float32));
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memcpy(y, p.y, nVertices * sizeof(float32));
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}
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};
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const int32 MAX_CONNECTED = 32;
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const float32 COLLAPSE_DIST_SQR = CMP_EPSILON*CMP_EPSILON;//0.1f;//1000*CMP_EPSILON*1000*CMP_EPSILON;
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class b2PolyNode{
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public:
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b2Vec2 position;
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b2PolyNode* connected[MAX_CONNECTED];
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int32 nConnected;
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bool visited;
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b2PolyNode(b2Vec2& pos);
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b2PolyNode();
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void AddConnection(b2PolyNode& toMe);
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void RemoveConnection(b2PolyNode& fromMe);
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void RemoveConnectionByIndex(int32 index);
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bool IsConnectedTo(b2PolyNode& me);
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b2PolyNode* GetRightestConnection(b2PolyNode* incoming);
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b2PolyNode* GetRightestConnection(b2Vec2& incomingDir);
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};
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b2Polygon ConvexHull(b2Vec2* v, int nVert);
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b2Polygon ConvexHull(float32* cloudX, float32* cloudY, int32 nVert);
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}
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#endif
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