1 files changed, 71 insertions, 0 deletions
diff --git a/2018-tower-defence/src/engine/geometry.rs b/2018-tower-defence/src/engine/geometry.rs
new file mode 100644
index 0000000..9cd1d90
--- /dev/null
+++ b/2018-tower-defence/src/engine/geometry.rs
@@ -0,0 +1,71 @@
+use engine::constants::*;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Point {
+    pub index: u8
+}
+
+impl Point {
+    pub fn new(x: u8, y: u8) -> Point {
+        let flipped_x = if x >= SINGLE_MAP_WIDTH {
+            FULL_MAP_WIDTH - x - 1
+        } else {
+            x
+        };
+        Point {
+            index: y * SINGLE_MAP_WIDTH + flipped_x
+        }
+    }
+
+    pub fn new_index(index: u8) -> Point {
+        Point {
+            index
+        }
+    }
+
+    pub fn new_double_bitfield(x: u8, y: u8, is_left_player: bool) -> (u64, u64) {
+        let bitfield = Point::new(x, y).to_bitfield();
+        if (x >= SINGLE_MAP_WIDTH) == is_left_player {
+            (0, bitfield)
+        } else {
+            (bitfield, 0)
+        }
+    }
+
+    pub fn x(self) -> u8 {
+        self.index % SINGLE_MAP_WIDTH
+    }
+
+    pub fn y(self) -> u8 {
+        self.index / SINGLE_MAP_WIDTH
+    }
+}
+
+impl Point {
+    /**
+     * # Bitfields
+     * 
+     * 0,0 is the top left point.
+     * >> (towards 0) moves bits towards the player that owns that side
+     * << (towards max) moves bits towards the opponent
+     * This involves mirroring the x dimension for the opponent's side
+     */
+
+    pub fn to_bitfield(self) -> u64 {
+        1u64 << self.index
+    }
+}
+
+use std::cmp::Ord;
+use std::cmp::Ordering;
+
+impl PartialOrd for Point {
+    fn partial_cmp(&self, other: &Point) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+impl Ord for Point {
+    fn cmp(&self, other: &Point) -> Ordering {
+        self.index.cmp(&other.index)
+    }
+}