added new helper methods

worked on gridWalker v3

geo/Heading.h

@@ -77,10 +77,10 @@ public:
 	}
 
 
-        Heading& operator = (const float _rad) {
-            rad = _rad;
-            return *this;
-        }
+		Heading& operator = (const float _rad) {
+			rad = _rad;
+			return *this;
+		}
 
 	/** compare two headings */
 	bool operator == (const Heading other) const {return rad == other.rad;}
@@ -95,6 +95,11 @@ public:
 
 	float getRAD() const {return rad;}
 
+	/** convert heading into a direction-vector */
+	Point2 asVector() const {
+		return Point2(std::cos(rad), std::sin(rad));
+	}
+
 //	/** get a random heading */
 //	static Heading rnd() {
 //		static std::minstd_rand gen(1234);