app work

src/layout/vec2.rs

@@ -96,3 +96,9 @@ impl std::fmt::Debug for Vec2 {
         write!(f, "({}, {})", self.x, self.y)
     }
 }
+
+impl std::fmt::Display for Vec2 {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "({}, {})", self.x, self.y)
+    }
+}