feat: add collisions

src/vec.py

@@ -61,3 +61,8 @@ class Vec:
             cos(angle) * self.x - sin(angle) * self.y,
             sin(angle) * self.x + cos(angle) * self.y,
         )
+
+    def within(self, p1: Vec, p2: Vec) -> bool:
+        x1, x2 = min(p1.x, p2.x), max(p1.x, p2.x)
+        y1, y2 = min(p1.y, p2.y), max(p1.y, p2.y)
+        return (x1 <= self.x <= x2) and (y1 <= self.y <= y2)