1 files changed, 92 insertions, 0 deletions
diff --git a/evc/src/helpers/vector.rs b/evc/src/helpers/vector.rs
new file mode 100644
index 0000000..9e7369e
--- /dev/null
+++ b/evc/src/helpers/vector.rs
@@ -0,0 +1,92 @@
+use crate::ser::{Ser, Sink, Source};
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Vec2<T> {
+    pub x: T,
+    pub y: T,
+}
+
+impl Vec2<isize> {
+    pub const ZERO: Vec2<isize> = Vec2 { x: 0, y: 0 };
+    pub const UP: Vec2<isize> = Vec2 { x: 0, y: -1 };
+    pub const LEFT: Vec2<isize> = Vec2 { x: -1, y: 0 };
+}
+impl Vec2<f32> {
+    pub const ZERO: Vec2<f32> = Vec2 { x: 0.0, y: 0.0 };
+    pub const UP: Vec2<f32> = Vec2 { x: 0.0, y: -1.0 };
+    pub const LEFT: Vec2<f32> = Vec2 { x: -1.0, y: 0.0 };
+}
+
+impl<T: std::ops::Div<Output = T> + Copy> Vec2<T> {
+    pub fn downscale(&self, f: T) -> Self {
+        Self {
+            x: self.x / f,
+            y: self.y / f,
+        }
+    }
+}
+
+impl Ser for Vec2<isize> {
+    fn write(&self, sink: &mut impl std::io::Write) -> anyhow::Result<()> {
+        sink.put((self.x, self.y))
+    }
+
+    fn read(source: &mut impl std::io::Read) -> anyhow::Result<Self> {
+        let (x, y) = source.get()?;
+        Ok(Vec2 { x, y })
+    }
+}
+
+pub struct Small<T>(pub T);
+impl Ser for Small<Vec2<isize>> {
+    fn write(&self, sink: &mut impl std::io::Write) -> anyhow::Result<()> {
+        sink.put((self.0.x as i8, self.0.y as i8))
+    }
+
+    fn read(source: &mut impl std::io::Read) -> anyhow::Result<Self> {
+        let (x, y): (i8, i8) = source.get()?;
+        Ok(Small(Vec2 {
+            x: x as isize,
+            y: y as isize,
+        }))
+    }
+}
+
+impl<T: std::ops::Add> std::ops::Add for Vec2<T> {
+    type Output = Vec2<T::Output>;
+    #[inline]
+    fn add(self, rhs: Self) -> Self::Output {
+        Vec2 {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y,
+        }
+    }
+}
+impl<T: std::ops::Sub> std::ops::Sub for Vec2<T> {
+    type Output = Vec2<T::Output>;
+    #[inline]
+    fn sub(self, rhs: Self) -> Self::Output {
+        Vec2 {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y,
+        }
+    }
+}
+impl<T: std::ops::Mul> std::ops::Mul for Vec2<T> {
+    type Output = Vec2<T::Output>;
+    #[inline]
+    fn mul(self, rhs: Self) -> Self::Output {
+        Vec2 {
+            x: self.x * rhs.x,
+            y: self.y * rhs.y,
+        }
+    }
+}
+
+impl<T> From<(T, T)> for Vec2<T> {
+    #[inline]
+    fn from((x, y): (T, T)) -> Self {
+        Vec2 { x, y }
+    }
+}
+