IntelliTriangulation.h

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#ifndef INTELLITRIANGULATION_H
#define INTELLITRIANGULATION_H
 
#include <QPoint>
#include <vector>
 
struct Triangle {
        QPoint A,B,C;
};
 
namespace IntelliTriangulation {
 
inline float sign(QPoint& p1, QPoint& p2, QPoint& p3){
        return (p1.x() - p3.x()) * (p2.y() - p3.y()) - (p2.x() - p3.x()) * (p1.y() - p3.y());
}
 
inline bool isInTriangle(Triangle& tri, QPoint& P){
        float val1, val2, val3;
        bool neg, pos;
 
        val1 = IntelliTriangulation::sign(P,tri.A,tri.B);
        val2 = IntelliTriangulation::sign(P,tri.B,tri.C);
        val3 = IntelliTriangulation::sign(P,tri.C,tri.A);
 
        neg = (val1<0.f) || (val2<0.f) || (val3<0.f);
        pos = (val1>0.f) || (val2>0.f) || (val3>0.f);
 
        return !(neg && pos);
}
 
std::vector<Triangle> calculateTriangles(std::vector<QPoint> polyPoints);
 
bool isInPolygon(std::vector<Triangle> &triangles, QPoint &point);
}
 
#endif