textium: add a Vec2d

textium/src/geometry.rs

@@ -2,6 +2,7 @@
 
 use std::ops::{Add, Sub, Mul};
 
+use num_traits::cast::NumCast;
 
 /// A rectangle.
 #[derive(Debug, Hash, Eq, PartialEq, Copy, Clone)]
@@ -64,3 +65,33 @@ impl<T> Rect<T>
         self.bottom() >= other.bottom()
     }
 }
+
+/// A 2D vector
+#[derive(Debug, Hash, Eq, PartialEq, Copy, Clone)]
+pub struct Vec2<T> {
+    pub x: T, pub y: T
+}
+
+impl<T> Vec2<T> {
+    pub fn new(x: T, y: T) -> Vec2<T> {
+        Vec2 { x: x, y: y, }
+    }
+}
+
+impl<T> From<(T, T)> for Vec2<T> {
+    fn from(tuple: (T, T)) -> Self {
+        Vec2 {
+            x: tuple.0,
+            y: tuple.1,
+        }
+    }
+}
+
+impl<S> Vec2<S> where S: NumCast + Copy {
+    pub fn cast<T>(&self) -> Vec2<T> where T: NumCast {
+        Vec2 {
+            x: NumCast::from(self.x).unwrap(),
+            y: NumCast::from(self.y).unwrap(),
+        }
+    }
+}