feat: add Cross2D for Kreuzprodukt vector calculation

src/engineVector.c

@@ -1,27 +1,26 @@
 #include "engine.h"
 
 bool IsVectorZero(Vector2 v) {
-    float epsilon = 0.01f;
-    return (fabs(v.x) < epsilon && fabs(v.y) < epsilon);
+  float epsilon = 0.01f;
+  return (fabs(v.x) < epsilon && fabs(v.y) < epsilon);
 }
 
 Vector2 GetRandomVector(const Rectangle bounds) {
-    return (Vector2){
-        bounds.x + (float)GetRandomValue(0, 10000) / 10000.0f * bounds.width,
-        bounds.y + (float)GetRandomValue(0, 10000) / 10000.0f * bounds.height
-    };
+  return (Vector2){
+      bounds.x + (float)GetRandomValue(0, 10000) / 10000.0f * bounds.width,
+      bounds.y + (float)GetRandomValue(0, 10000) / 10000.0f * bounds.height};
 }
 
-Vector2 RotationToVector2(float rotation)
-{
-	float rad = rotation * (PI / 180.0f);
-	Vector2 vec = { cosf(rad), sinf(rad) };
-	return vec;
+Vector2 RotationToVector2(float rotation) {
+  float rad = rotation * (PI / 180.0f);
+  Vector2 vec = {cosf(rad), sinf(rad)};
+  return vec;
 }
 
-float Vector2ToRotation(Vector2 vec)
-{
-    float rad = atan2f(vec.y, vec.x);
-    float deg = rad * (180.0f / PI);
-    return deg; 
+float Vector2ToRotation(Vector2 vec) {
+  float rad = atan2f(vec.y, vec.x);
+  float deg = rad * (180.0f / PI);
+  return deg;
 }
+
+float Cross2D(Vector2 a, Vector2 b) { return a.x * b.y - a.y * b.x; }