geometry utilities

src/Circle.cpp

@@ -44,6 +44,10 @@ void Circle::render(SDL_Renderer *renderer) {
 void Circle::setPosition(Vector vec) {
   center = vec;
 }
+
+float Circle::getOverlap(Circle c) {
+	return (c.center.distanceTo(center)-radius-c.radius)/2;
+}
 /*
 bool Circle::isInitialized() {
   if(center.x == NULL) {

src/Circle.h

@@ -29,6 +29,7 @@ class Circle {
   void translate(Vector vec);
   void setColor(Color c);
   void setPosition(Vector vec);
+	float getOverlap(Circle c);
   //bool isInitialized();
 };
 #endif

src/Vector.cpp

@@ -12,5 +12,11 @@ Vector::Vector() {
 }
 
 int Vector::distanceTo(Vector vec) {
-  return sqrt(pow(abs(x - vec.x),2)+pow(abs(y - vec.y),2));
+  return sqrt(pow(abs(xDif(vec)),2)+pow(abs(yDif(vec)),2));
+}
+int Vector::xDif(Vector vec) {
+	return x-vec.x;
+}
+int Vector::yDif(Vector vec) {
+	return y-vec.y;
 }

src/Vector.h

@@ -6,5 +6,7 @@ class Vector {
   Vector();
   Vector(float x, float y);
   int distanceTo(Vector vec);
+	int xDif(Vector vec);
+	int yDif(Vector vec);
 };
 #endif