textium::geometry::Rect

textium/src/geometry.rs

@@ -0,0 +1,64 @@
+use std::ops::{Add, Sub, Mul};
+
+
+/// A rectangle.
+#[derive(Debug, Hash, Eq, PartialEq, Copy, Clone)]
+pub struct Rect<T> {
+    x: T, y: T,
+    w: T, h: T,
+}
+
+#[allow(dead_code)]
+impl<T> Rect<T>
+    where T: Copy + Add<Output=T> + Sub<Output=T> + Mul<Output=T>
+             + Ord + PartialOrd
+{
+    /// Returns a new rectangle given the upper-left corner and its width + height.
+    pub fn new(x: T, y: T, w: T, h: T) -> Rect<T> {
+        Rect {
+            x: x, y: y,
+            w: w, h: h,
+        }
+    }
+
+    /// Returns a new rectangle given a pair of points in opposing corners.
+    pub fn from_points(x1: T, y1: T, x2: T, y2: T) -> Rect<T> {
+        Rect {
+            x: x1, y: y1,
+            w: x2 - x1, h: y2 - y1
+        }
+    }
+
+    /// Return the position of the top edge of the rectangle.
+    #[inline(always)]
+    pub fn top(&self) -> T {self.y}
+    /// Return the position of the left edge of the rectangle.
+    #[inline(always)]
+    pub fn left(&self) -> T {self.x}
+    /// Return the position of the bottom edge of the rectangle.
+    #[inline(always)]
+    pub fn bottom(&self) -> T {self.y + self.h}
+    /// Return the position of the right edge of the rectangle.
+    #[inline(always)]
+    pub fn right(&self) -> T {self.x + self.w}
+
+    /// Return the area of the rectangle.
+    #[inline(always)]
+    pub fn area(&self) -> T {self.x * self.y}
+
+    /// Given this rectangle and another rectangle, return true if they intersect.
+    pub fn intersects(&self, other: &Rect<T>) -> bool {
+        self.left() < other.right() &&
+        self.right() > other.left() &&
+        self.top() < other.bottom() &&
+        self.bottom() > other.top()
+    }
+
+    /// Return true if this rectangle completely contains another rectangle.
+    pub fn contains(&self, other: &Rect<T>) -> bool {
+        self.left() <= other.left() &&
+        self.right() >= other.right() &&
+        self.top() <= other.top() &&
+        self.bottom() >= other.bottom()
+    }
+}