Support indexing a GridMap by Point

Overload the Index operator for GridMap to support indexing by Point.

src/rpgtools/lib.rs

@@ -2,4 +2,4 @@
 //!
 //! This crate contains various tools for working with role-playing-game (RPG) data.
 pub mod error;
-pub mod map;
+pub mod map;

src/rpgtools/map/gridmap.rs

@@ -2,6 +2,8 @@
 use std::cmp;
 use std::collections::HashSet;
 use std::collections::VecDeque;
+use std::ops::Index;
+use std::ops::IndexMut;
 
 // Extern crates
 use rand::prelude::*;
@@ -105,7 +107,7 @@ impl GridMap {
             .find_by(point, &|cell: &GridCell| -> bool { cell.is_room() })
             .unwrap();
 
-        self.place_entrance(point);
+        self.place_entrance(point)?;
         Ok(())
     }
 
@@ -626,6 +628,16 @@ impl GridMap {
     }
 }
 
+impl Index<Point> for GridMap {
+    type Output = GridCell;
+
+    fn index(&self, index: Point) -> &Self::Output {
+        let (x, y): (usize, usize) = index.try_into().unwrap();
+        &self.cells[x][y]
+    }
+}
+
+
 #[cfg(test)]
 mod tests {
 

src/rpgtools/map/gridmap/point.rs

@@ -9,8 +9,8 @@ use std::ops::{Add, Neg, Sub};
 /// Note that this type is just an index and therefore implements both Clone and Copy.
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub struct Point {
-    x: i64,
-    y: i64,
+    pub x: i64,
+    pub y: i64,
 }
 
 impl Point {