many changes :P

geo/BBox2.h

@@ -0,0 +1,71 @@
+#ifndef BBOX2_H
+#define BBOX2_H
+
+#include "Point2.h"
+#include "Line2.h"
+
+class BBox2 {
+
+protected:
+
+	static constexpr float MAX = +99999;
+	static constexpr float MIN = -99999;
+
+	/** minimum */
+	Point2 p1;
+
+	/** maximum */
+	Point2 p2;
+
+public:
+
+	BBox2() : p1(MAX,MAX), p2(MIN,MIN) {;}
+
+	/** adjust the bounding-box by adding this point */
+	void add(const Point2& p) {
+
+		if (p.x > p2.x) {p2.x = p.x;}
+		if (p.y > p2.y) {p2.y = p.y;}
+
+		if (p.x < p1.x) {p1.x = p.x;}
+		if (p.y < p1.y) {p1.y = p.y;}
+
+	}
+
+	/** get the bbox's minimum */
+	const Point2& getMin() const {return p1;}
+
+	/** get the bbox's maximum */
+	const Point2& getMax() const {return p2;}
+
+	/** equal? */
+	bool operator == (const BBox2& o) const {
+		return	(p1.x == o.p1.x) &&
+				(p1.y == o.p1.y) &&
+				(p2.x == o.p2.x) &&
+				(p2.y == o.p2.y);
+	}
+
+	/** does the BBox intersect with the given line? */
+	bool intersects (const Line2& l) const {
+		Line2 l1(p1.x, p1.y, p2.x, p1.y);		// upper
+		Line2 l2(p1.x, p2.y, p2.x, p2.y);		// lower
+		Line2 l3(p1.x, p1.y, p1.x, p2.y);		// left
+		Line2 l4(p2.x, p1.y, p2.x, p2.y);		// right
+		return	l.getSegmentIntersection(l1) ||
+				l.getSegmentIntersection(l2) ||
+				l.getSegmentIntersection(l3) ||
+				l.getSegmentIntersection(l4);
+	}
+
+	bool contains(const Point2& p) const {
+		if (p.x < p1.x) {return false;}
+		if (p.x > p2.x) {return false;}
+		if (p.y < p1.y) {return false;}
+		if (p.y > p2.y) {return false;}
+		return true;
+	}
+
+};
+
+#endif // BBOX2_H