New collision detection

sdlpp/sdlpp_collision.cpp

@@ -1,4 +1,5 @@
 #include "sdlpp_collision.hpp"
+#include "sdlpp_geometry.hpp"
 
 namespace SDLPP {
 CollisionPolygon::CollisionPolygon( double x, double y )
@@ -53,8 +54,14 @@ bool infinityIntersection( const SDLPP::CollisionPolygon &infinite,
 
 bool intersects( const SDLPP::CollisionPolygon &p1,
                  const SDLPP::CollisionPolygon &p2 ) {
-    return !(
-        p1.rightmost() < p2.leftmost() || p2.rightmost() < p1.leftmost() ||
-        p1.topmost() > p2.bottommost() || p2.topmost() > p1.bottommost() );
+    if(p1.rightmost() < p2.leftmost() || p2.rightmost() < p1.leftmost() || p1.bottommost() < p2.topmost() || p2.bottommost() < p1.topmost())
+        return false;
+    for(auto &line : p1.getLines()) {
+        for(auto &line2 : p2.getLines()) {
+            if(linesCross(line, line2))
+                return true;
+        }
+    }
+    return false;
 }
 } // namespace SDLPP