godot/drivers/convex_decomp/b2Polygon.h
2014-02-09 22:10:30 -03:00

132 lines
3.7 KiB
C++

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