start implementing Rectangle

src/geometry.rs

@@ -76,6 +76,67 @@ impl PartialEq for Point {
 
 impl Eq for Point {}
 
+impl Rectangle {
+    fn from_corner_width_height(corner: Point, width: u32, height: u32) -> Rectangle {
+        Rectangle {
+            x: corner.x(),
+            y: corner.y(),
+            width,
+            height,
+        }
+    }
+
+    fn from_corners(corner_a: Point, corner_b: Point) -> Rectangle {
+        let left = corner_a.x().min(corner_b.x());
+        let top = corner_a.y().min(corner_b.y());
+
+        let width = (corner_a.x() as i64 - corner_b.x() as i64).abs() as u32;
+        let height = (corner_a.y() as i64 - corner_b.y() as i64).abs() as u32;
+
+        Rectangle {
+            x: left,
+            y: top,
+            width,
+            height,
+        }
+    }
+
+    fn at_origin_with_size(width: u32, height: u32) -> Rectangle {
+        Rectangle {
+            x: 0,
+            y: 0,
+            width,
+            height,
+        }
+    }
+
+    fn width(&self) -> u32 {
+        self.width
+    }
+
+    fn height(&self) -> u32 {
+        self.height
+    }
+
+    fn with_width(&self, width: u32) -> Rectangle {
+        Rectangle {
+            x: self.x,
+            y: self.y,
+            width,
+            height: self.height,
+        }
+    }
+
+    fn with_height(&self, height: u32) -> Rectangle {
+        Rectangle {
+            x: self.x,
+            y: self.y,
+            width: self.width,
+            height,
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;