Merge branch 'maths'

include/maths/maths.h

@@ -2,5 +2,6 @@
 #define __MATHEMATICS_INCLUDE_H__
 
 #include "maths/vec2.h"
+#include "maths/rect.h"
 
 #endif //  __MATHEMATICS_INCLUDE_H__

include/maths/rect.h

+#ifndef __MATHS_RECT_H__
+#define __MATHS_RECT_H__
+
+#include "maths/vec2.h"
+
+class Rect
+{
+	public:
+		Rect( float x, float y, float w, float h );
+		Rect( Vec2 pt, float w, float h );
+		~Rect(){}
+
+		bool isOverlap( Vec2 pt );
+		bool isOverlap( Rect rect );
+		
+		bool overlap_horizontal( Rect rect );
+		bool overlap_vertical( Rect rect );
+
+	private:
+		Vec2 _pt;
+		float _halfWidth;
+		float _halfHeight;
+};
+
+
+#endif // __MATHS_RECT_H__

src/maths/rect.cpp

+#include "maths/rect.h"
+
+Rect::Rect( float x, float y, float w, float h )
+	: Rect( Vec2(x, y), w, h )
+{}
+Rect::Rect( Vec2 pt, float w, float h )
+	: _pt( pt ),
+	_halfWidth( w / 2 ),
+	_halfHeight( h / 2 )
+{}
+
+bool Rect::isOverlap( Vec2 pt )
+{
+	return pt.x > ( pt.x - _halfWidth )
+		&& pt.x < ( pt.x + _halfWidth )
+		&& pt.y > ( pt.y - _halfHeight )
+		&& pt.y < ( pt.y + _halfHeight );
+}
+bool Rect::isOverlap( Rect rect )
+	{ return this->overlap_horizontal( rect ) && this->overlap_vertical( rect ); }
+
+
+bool Rect::overlap_horizontal( Rect rect )
+{
+	return abs( this->_pt.x - rect._pt.x )
+		< this->_halfWidth + rect._halfWidth;
+}
+bool Rect::overlap_vertical( Rect rect )
+{
+	return abs( this->_pt.y - rect._pt.y )
+		< this->_halfHeight + rect._halfHeight;
+}
+