Added ToFactor function

include/Vector2.h

@@ -217,6 +217,7 @@ public:
 	/// Value -1 is *from* vector minus the difference between *from* and *to* etc.
 	static Vector2 Lerp(Vector2 from, Vector2 to, float f);
 
+	static float ToFactor(Vector2 a, Vector2 b);
 };
 
 #endif

src/Vector2.cpp

@@ -120,7 +120,11 @@ float Vector2::SignedAngle(Vector2 from, Vector2 to) {
 	return (angleTo - angleFrom) * Rad2Deg;
 }
 
-static Vector2 Lerp(Vector2 from, Vector2 to, float f) {
+Vector2 Vector2::Lerp(Vector2 from, Vector2 to, float f) {
 	Vector2 v = from + (to - from) * f;
 	return v;
 }
+
+float Vector2::ToFactor(Vector2 a, Vector2 b) {
+	return (1 - Vector2::Dot(a, b)) / 2;
+}

test/Vector2_test.cc

@@ -417,8 +417,10 @@ TEST(Vector2, SignedAngle) {
 	}
 }
 
-//TEST(Vector2, DISABLED_Lerp) {
-//
-//}
+TEST(Vector2, DISABLED_Lerp) {
+}
+
+TEST(Vector2, DIABLED_ToFactor) {
+}
 
 #endif