Add Vec2

showbits-common/src/lib.rs

@@ -1,3 +1,3 @@
-pub fn greet(who: &str) {
-    println!("Hello {who}!");
-}
+pub use crate::vec2::Vec2;
+
+mod vec2;

showbits-common/src/vec2.rs

@@ -0,0 +1,87 @@
+use std::{
+    fmt,
+    ops::{Add, Mul, Neg, Sub},
+};
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub struct Vec2 {
+    pub x: i32,
+    pub y: i32,
+}
+
+impl Vec2 {
+    pub const ZERO: Self = Self::new(0, 0);
+    pub const NORTH: Self = Self::new(0, -1);
+    pub const SOUTH: Self = Self::new(0, 1);
+    pub const WEST: Self = Self::new(-1, 0);
+    pub const EAST: Self = Self::new(1, 0);
+
+    pub const fn new(x: i32, y: i32) -> Self {
+        Self { x, y }
+    }
+
+    pub fn to(self, other: Self) -> Self {
+        other - self
+    }
+}
+
+impl fmt::Debug for Vec2 {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_tuple("Vec2").field(&self.x).field(&self.y).finish()
+    }
+}
+
+impl Neg for Vec2 {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        Self {
+            x: -self.x,
+            y: -self.y,
+        }
+    }
+}
+
+impl Add for Vec2 {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        }
+    }
+}
+
+impl Sub for Vec2 {
+    type Output = Self;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        }
+    }
+}
+
+impl Mul<i32> for Vec2 {
+    type Output = Self;
+
+    fn mul(self, rhs: i32) -> Self::Output {
+        Self {
+            x: self.x * rhs,
+            y: self.y * rhs,
+        }
+    }
+}
+
+impl Mul for Vec2 {
+    type Output = Self;
+
+    fn mul(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x * rhs.x,
+            y: self.y * rhs.y,
+        }
+    }
+}