-int issolid(float x, float y);
-int isbrick(float x, float y);
-int isice(float x, float y);
-int isfullbox(float x, float y);
-int rectcollision(base_type* one, base_type* two);
+bool issolid(float x, float y);
+bool isbrick(float x, float y);
+bool isice(float x, float y);
+bool isfullbox(float x, float y);
+bool rectcollision(base_type* one, base_type* two);