Change tile type from magic number to enum

src/main.rs

@@ -17,7 +17,7 @@ use perlin_noise::PerlinNoise;
 
 use canvas_copy_at::CopyAt;
 use texture_manager::TextureManager;
-use tile::Tile;
+use tile::{Tile, TileType};
 
 struct GameState {
     camera_x: i32,
@@ -99,7 +99,7 @@ fn render(
 
     for (y, row) in map.iter().enumerate() {
         for (x, tile) in row.iter().enumerate().rev() {
-            let texture = &texture_manager[tile.type_];
+            let texture = &texture_manager[tile.type_.clone()];
             let (screen_x, screen_y) = world_to_screen(x as i32, y as i32, tile.height);
 
             canvas
@@ -117,7 +117,7 @@ fn render(
 
 fn generate_map() -> Vec<Vec<Tile>> {
     let perlin = PerlinNoise::new();
-    let mut map = vec![vec![Tile::new(6, 0); 128]; 128];
+    let mut map = vec![vec![Tile::new(TileType::Grass, 0); 128]; 128];
 
     for (y, row) in map.iter_mut().enumerate() {
         for (x, tile) in row.iter_mut().enumerate() {
@@ -126,6 +126,13 @@ fn generate_map() -> Vec<Vec<Tile>> {
         }
     }
 
+    map[0][0].type_ = TileType::Road {
+        direction: tile::Direction::NorthSouth,
+    };
+    map[0][1].type_ = TileType::Road {
+        direction: tile::Direction::EastWest,
+    };
+
     map
 }
 

src/texture_manager.rs

@@ -4,6 +4,8 @@ use sdl2::video::WindowContext;
 use std::collections::HashMap;
 use std::ops::Index;
 
+use tile::{Direction, TileType};
+
 pub struct TextureManager<'a> {
     textures: HashMap<&'a str, Texture<'a>>,
 }
@@ -26,27 +28,22 @@ impl<'a> TextureManager<'a> {
     }
 
     pub fn load_textures(&mut self, texture_creator: &'a TextureCreator<WindowContext>) {
-        self.load_texture(texture_creator, "bridge_east", "data/png/bridgeEast.png");
-        self.load_texture(texture_creator, "bridge_north", "data/png/bridgeNorth.png");
-        self.load_texture(texture_creator, "crossroad", "data/png/crossroad.png");
-        self.load_texture(texture_creator, "dirt", "data/png/dirt.png");
-        self.load_texture(texture_creator, "dirt_high", "data/png/dirtHigh.png");
         self.load_texture(texture_creator, "grass", "data/png/grass.png");
+        self.load_texture(texture_creator, "road_north", "data/png/roadNorth.png");
+        self.load_texture(texture_creator, "road_east", "data/png/roadEast.png");
     }
 }
 
-impl<'a> Index<usize> for TextureManager<'a> {
+impl<'a> Index<TileType> for TextureManager<'a> {
     type Output = Texture<'a>;
 
-    fn index(&self, index: usize) -> &Texture<'a> {
+    fn index(&self, index: TileType) -> &Texture<'a> {
         let key = match index {
-            1 => "bridge_east",
-            2 => "bridge_north",
-            3 => "crossroad",
-            4 => "dirt",
-            5 => "dirt_high",
-            6 => "grass",
-            _ => panic!("invalid texture ID"),
+            TileType::Grass => "grass",
+            TileType::Road { direction } => match direction {
+                Direction::NorthSouth => "road_north",
+                Direction::EastWest => "road_east",
+            },
         };
 
         &self.textures[key]

src/tile.rs

@@ -1,11 +1,23 @@
-#[derive(Clone)]
+#[derive(Debug, Clone)]
+pub enum Direction {
+    NorthSouth,
+    EastWest,
+}
+
+#[derive(Debug, Clone)]
+pub enum TileType {
+    Grass,
+    Road { direction: Direction },
+}
+
+#[derive(Debug, Clone)]
 pub struct Tile {
-    pub type_: usize,
+    pub type_: TileType,
     pub height: i32,
 }
 
 impl Tile {
-    pub fn new(type_: usize, height: i32) -> Tile {
+    pub fn new(type_: TileType, height: i32) -> Tile {
         Tile { type_, height }
     }
 }