Start on chapter 3

src/components.rs

@@ -1,6 +1,16 @@
 use specs::{Component, NullStorage, VecStorage, World, WorldExt};
 
-// Components
+pub enum BoxColor {
+    Red,
+    Blue,
+}
+
+impl Display for BoxColor {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        
+    }
+}
+
 #[derive(Debug, Component, Clone, Copy)]
 #[storage(VecStorage)]
 pub struct Position {
@@ -13,6 +23,10 @@ impl Position {
     pub fn new(x: u8, y: u8) -> Self {
         Position { x, y, z: 0 }
     }
+
+    pub fn with_z(self, z: u8) -> Self {
+        Position { z, ..self }
+    }
 }
 
 #[derive(Component)]
@@ -31,11 +45,15 @@ pub struct Player {}
 
 #[derive(Component)]
 #[storage(VecStorage)]
-pub struct Box {}
+pub struct Box {
+    pub color: BoxColor,
+}
 
 #[derive(Component)]
 #[storage(VecStorage)]
-pub struct BoxSpot {}
+pub struct BoxSpot {
+    pub color: BoxColor,
+}
 
 #[derive(Component, Default)]
 #[storage(NullStorage)]

src/entities.rs

@@ -5,7 +5,7 @@ use specs::{Builder, World, WorldExt, EntityBuilder};
 fn common_entity<'w>(world: &'w mut World, position: Position, z: u8,  sprite_path: &str) -> EntityBuilder<'w> {
     return world
         .create_entity()
-        .with(Position { z, ..position })
+        .with(position.with_z(z))
         .with(Renderable { path: sprite_path.to_string() });
 }