3 files changed, 166 insertions, 0 deletions
diff --git a/2019-worms/src/geometry/direction.rs b/2019-worms/src/geometry/direction.rs
new file mode 100644
index 0000000..e37f750
--- /dev/null
+++ b/2019-worms/src/geometry/direction.rs
@@ -0,0 +1,67 @@
+use crate::geometry::vec::Vec2d;
+use std::fmt;
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum Direction {
+    North,
+    NorthEast,
+    East,
+    SouthEast,
+    South,
+    SouthWest,
+    West,
+    NorthWest,
+}
+
+impl fmt::Display for Direction {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        use Direction::*;
+        let s = match self {
+            North => "N",
+            NorthEast => "NE",
+            East => "E",
+            SouthEast => "SE",
+            South => "S",
+            SouthWest => "SW",
+            West => "W",
+            NorthWest => "NW",
+        };
+        f.write_str(s)
+    }
+}
+
+impl Direction {
+    pub fn is_diagonal(&self) -> bool {
+        use Direction::*;
+
+        match self {
+            NorthEast | SouthEast | SouthWest | NorthWest => true,
+            _ => false,
+        }
+    }
+
+    pub fn as_vec(&self) -> Vec2d {
+        use Direction::*;
+        match self {
+            North => Vec2d::new(0, -1),
+            NorthEast => Vec2d::new(1, -1),
+            East => Vec2d::new(1, 0),
+            SouthEast => Vec2d::new(1, 1),
+            South => Vec2d::new(0, 1),
+            SouthWest => Vec2d::new(-1, 1),
+            West => Vec2d::new(-1, 0),
+            NorthWest => Vec2d::new(-1, -1),
+        }
+    }
+
+    pub const ALL: [Direction; 8] = [
+        Direction::North,
+        Direction::NorthEast,
+        Direction::East,
+        Direction::SouthEast,
+        Direction::South,
+        Direction::SouthWest,
+        Direction::West,
+        Direction::NorthWest,
+    ];
+}
diff --git a/2019-worms/src/geometry/point.rs b/2019-worms/src/geometry/point.rs
new file mode 100644
index 0000000..1ab9b36
--- /dev/null
+++ b/2019-worms/src/geometry/point.rs
@@ -0,0 +1,37 @@
+use crate::geometry::vec::*;
+
+use std::ops::*;
+
+#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq)]
+pub struct Point2d {
+    pub x: i8,
+    pub y: i8,
+}
+
+impl Point2d {
+    pub fn new(x: i8, y: i8) -> Point2d {
+        Point2d { x, y }
+    }
+}
+
+impl Add<Vec2d> for Point2d {
+    type Output = Self;
+
+    fn add(self, other: Vec2d) -> Self {
+        Point2d {
+            x: self.x.saturating_add(other.x),
+            y: self.y.saturating_add(other.y),
+        }
+    }
+}
+
+impl Sub for Point2d {
+    type Output = Vec2d;
+
+    fn sub(self, other: Self) -> Vec2d {
+        Vec2d {
+            x: self.x.saturating_sub(other.x),
+            y: self.y.saturating_sub(other.y),
+        }
+    }
+}
diff --git a/2019-worms/src/geometry/vec.rs b/2019-worms/src/geometry/vec.rs
new file mode 100644
index 0000000..375a0f9
--- /dev/null
+++ b/2019-worms/src/geometry/vec.rs
@@ -0,0 +1,62 @@
+use std::ops::*;
+
+#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq)]
+pub struct Vec2d {
+    pub x: i8,
+    pub y: i8,
+}
+
+impl Vec2d {
+    pub const fn new(x: i8, y: i8) -> Vec2d {
+        Vec2d { x, y }
+    }
+    pub fn magnitude_squared(&self) -> i8 {
+        self.x
+            .saturating_pow(2)
+            .saturating_add(self.y.saturating_pow(2))
+    }
+}
+
+impl Add for Vec2d {
+    type Output = Self;
+
+    fn add(self, other: Self) -> Self {
+        Vec2d {
+            x: self.x.saturating_add(other.x),
+            y: self.y.saturating_add(other.y),
+        }
+    }
+}
+
+impl Sub for Vec2d {
+    type Output = Self;
+
+    fn sub(self, other: Self) -> Self {
+        Vec2d {
+            x: self.x.saturating_sub(other.x),
+            y: self.y.saturating_sub(other.y),
+        }
+    }
+}
+
+impl Mul<i8> for Vec2d {
+    type Output = Self;
+
+    fn mul(self, other: i8) -> Self {
+        Vec2d {
+            x: self.x.saturating_mul(other),
+            y: self.y.saturating_mul(other),
+        }
+    }
+}
+
+impl Neg for Vec2d {
+    type Output = Self;
+
+    fn neg(self) -> Self {
+        Vec2d {
+            x: -self.x,
+            y: -self.y,
+        }
+    }
+}