fix rectangle snapping

core/src/point.rs

@@ -107,3 +107,13 @@ where
         write!(f, "Point {{ x: {}, y: {} }}", self.x, self.y)
     }
 }
+
+impl Point<f32> {
+    /// Snaps the [`Point`] to __unsigned__ integer coordinates.
+    pub fn snap(self) -> Point<u32> {
+        Point {
+            x: self.x.round() as u32,
+            y: self.y.round() as u32,
+        }
+    }
+}

core/src/rectangle.rs

@@ -243,16 +243,19 @@ impl Rectangle<f32> {
 
     /// Snaps the [`Rectangle`] to __unsigned__ integer coordinates.
     pub fn snap(self) -> Option<Rectangle<u32>> {
-        let width = self.width as u32;
-        let height = self.height as u32;
+        let top_left = self.position().snap();
+        let bottom_right = (self.position() + self.size().into()).snap();
+
+        let width = bottom_right.x - top_left.x;
+        let height = bottom_right.y - top_left.y;
 
         if width < 1 || height < 1 {
             return None;
         }
 
         Some(Rectangle {
-            x: self.x as u32,
-            y: self.y as u32,
+            x: top_left.x,
+            y: top_left.y,
             width,
             height,
         })