worked on grid-walker v3

geo/Heading.h

@@ -27,6 +27,11 @@ public:
 		Assert::isBetween(rad, 0.0f, (float)_2PI, "radians out of bounds");
 	}
 
+	/** ctor from(x,y) -> to(x,y) */
+	Heading(const Point2 from, const Point2 to) : Heading(from.x, from.y, to.x, to.y) {
+		;
+	}
+
 	/** POSITIVE angular difference [0:PI] */
 	float getDiffHalfRAD(const Heading other) const {
 		return Angle::getDiffRAD_2PI_PI(rad, other.rad);