Initial commit

BlueNoise/ScallopedSector.h

@@ -0,0 +1,51 @@
+// $Id: ScallopedSector.h,v 1.3 2006/07/06 23:30:24 zr Exp $
+
+#include <vector>
+
+typedef struct {
+	Vec2 P;
+	float r, sign, d, theta, integralAtStart;
+	float rSqrd, dSqrd;
+} ArcData;
+
+class ScallopedSector
+{
+public:
+	Vec2 P;
+	float a1, a2, area;
+	
+	ArcData arcs[2];
+
+public:
+	ScallopedSector(Vec2 &_Pt, float _a1, float _a2, Vec2 &P1, float r1, float sign1, Vec2 &P2, float r2, float sign2);
+
+	float calcAreaToAngle(float angle);
+	float calcAngleForArea(float area, RNG &rng);
+	Vec2 sample(RNG &rng);
+
+	float distToCurve(float angle, int index);
+
+	void subtractDisk(Vec2 &C, float r, std::vector<ScallopedSector> *regions);
+
+private:
+	float canonizeAngle(float angle);
+
+	void distToCircle(float angle, Vec2 &C, float r, float *d1_out, float *d2_out);
+};
+
+class ScallopedRegion
+{
+public:
+	std::vector<ScallopedSector> *regions;
+	float minArea;
+	float area;
+
+public:
+	ScallopedRegion(Vec2 &P, float r1, float r2, float minArea=.00000001);
+	~ScallopedRegion();
+
+	bool isEmpty() { return regions->size()==0; }
+	void subtractDisk(Vec2 C, float r);
+
+	Vec2 sample(RNG &rng);
+};