Add chapter 2.6

src/rect.rs

@@ -0,0 +1,25 @@
+pub struct Rect {
+    pub x1: i32,
+    pub x2: i32,
+    pub y1: i32,
+    pub y2: i32,
+}
+
+impl Rect {
+    pub fn new(x: i32, y: i32, w: i32, h: i32) -> Self {
+        Self {
+            x1: x,
+            y1: y,
+            x2: x + w,
+            y2: y + h,
+        }
+    }
+
+    pub fn intersect(&self, other: &Rect) -> bool {
+        self.x1 <= other.x2 && self.x2 >= other.x1 && self.y1 <= other.y2 && self.y2 >= other.y1
+    }
+
+    pub fn center(&self) -> (i32, i32) {
+        ((self.x1 + self.x2) / 2, (self.y1 + self.y2) / 2)
+    }
+}