many changes :P

geo/Line2.h

@@ -0,0 +1,54 @@
+#ifndef LINE2D_H
+#define LINE2D_H
+
+//#include <KLib/geo/Line.h>
+#include "Point2.h"
+
+class Line2 {
+
+public:
+
+	Point2 p1;
+
+	Point2 p2;
+
+public:
+
+	Line2() : p1(), p2() {;}
+
+	Line2(const float x1, const float y1, const float x2, const float y2) : p1(x1,y1), p2(x2,y2) {;}
+
+//	bool getSegmentIntersection(const Line& other) const {
+//		static K::Point p;
+//		return K::Line::getSegmentIntersection(other, p);
+//	}
+
+
+	bool getSegmentIntersection(const Line2& other) const {
+
+		const double bx = p2.x - p1.x;
+		const double by = p2.y - p1.y;
+
+		const double dx = other.p2.x - other.p1.x;
+		const double dy = other.p2.y - other.p1.y;
+
+		const double b_dot_d_perp = bx*dy - by*dx;
+
+		if(b_dot_d_perp == 0) {return false;}
+
+		const double cx = other.p1.x - p1.x;
+		const double cy = other.p1.y - p1.y;
+
+		const double t = (cx * dy - cy * dx) / b_dot_d_perp;
+		if(t < 0 || t > 1) {return false;}
+
+		const double u = (cx * by - cy * bx) / b_dot_d_perp;
+		if(u < 0 || u > 1) {return false;}
+
+		return true;
+
+	}
+
+};
+
+#endif // LINE2D_H