From 3f5492b2bb67326be43cd7c5ba02ccf0ba1ae0e3 Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Tue, 19 Apr 2022 21:27:56 +0200
Subject: Refile for merging repos

---
 2019-worms/src/game/map.rs | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 2019-worms/src/game/map.rs

(limited to '2019-worms/src/game/map.rs')

diff --git a/2019-worms/src/game/map.rs b/2019-worms/src/game/map.rs
new file mode 100644
index 0000000..84ec99a
--- /dev/null
+++ b/2019-worms/src/game/map.rs
@@ -0,0 +1,49 @@
+use crate::constants::*;
+use crate::geometry::*;
+
+#[derive(Default, Debug, PartialEq, Eq, Clone, Copy)]
+pub struct Map {
+    pub cells: [u64; MAP_U64S],
+}
+
+impl Map {
+    fn internal_index(p: Point2d) -> Option<(usize, usize)> {
+        if p.y < 0 || p.y as usize >= MAP_SIZE {
+            None
+        } else {
+            let row_data = &MAP_ROW_SIZE[p.y as usize];
+            if p.x < row_data.x_offset as i8 || p.x as usize >= row_data.x_offset + row_data.len() {
+                None
+            } else {
+                let global_bit = row_data.start_bit + p.x as usize - row_data.x_offset;
+                let integer = global_bit / 64;
+                let bit = global_bit % 64;
+                Some((integer, bit))
+            }
+        }
+    }
+
+    pub fn at(&self, p: Point2d) -> Option<bool> {
+        Map::internal_index(p).map(|(integer, bit)| {
+            let mask = 1 << bit;
+            self.cells[integer] & mask != 0
+        })
+    }
+
+    pub fn set(&mut self, p: Point2d) {
+        if let Some((integer, bit)) = Map::internal_index(p) {
+            let mask = 1 << bit;
+            self.cells[integer] |= mask;
+        } else {
+            panic!("Tried to set an out of bounds bit, {:?}", p);
+        }
+    }
+    pub fn clear(&mut self, p: Point2d) {
+        if let Some((integer, bit)) = Map::internal_index(p) {
+            let mask = !(1 << bit);
+            self.cells[integer] &= mask;
+        } else {
+            panic!("Tried to set an out of bounds bit, {:?}", p);
+        }
+    }
+}
-- 
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