Food spawning

Author: marcusbuffett

src/main.rs

@@ -1,6 +1,9 @@
+use bevy::core::FixedTimestep;
 use bevy::prelude::*;
+use rand::prelude::random;
 
 const SNAKE_HEAD_COLOR: Color = Color::rgb(0.7, 0.7, 0.7);
+const FOOD_COLOR: Color = Color::rgb(1.0, 0.0, 1.0);
 
 const ARENA_HEIGHT: u32 = 10;
 const ARENA_WIDTH: u32 = 10;
@@ -28,6 +31,9 @@ impl Size {
 #[derive(Component)]
 struct SnakeHead;
 
+#[derive(Component)]
+struct Food;
+
 fn setup_camera(mut commands: Commands) {
     commands.spawn_bundle(OrthographicCameraBundle::new_2d());
 }
@@ -96,18 +102,40 @@ fn position_translation(windows: Res<Windows>, mut q: Query<(&Position, &mut Tra
     }
 }
 
+fn food_spawner(mut commands: Commands) {
+    commands
+        .spawn_bundle(SpriteBundle {
+            sprite: Sprite {
+                color: FOOD_COLOR,
+                ..default()
+            },
+            ..default()
+        })
+        .insert(Food)
+        .insert(Position {
+            x: (random::<f32>() * ARENA_WIDTH as f32) as i32,
+            y: (random::<f32>() * ARENA_HEIGHT as f32) as i32,
+        })
+        .insert(Size::square(0.8));
+}
+
 fn main() {
     App::new()
         .insert_resource(ClearColor(Color::rgb(0.04, 0.04, 0.04)))
         .insert_resource(WindowDescriptor {
             title: "Snake!".to_string(),
             width: 500.0,
             height: 500.0,
-            ..Default::default()
+            ..default()
         })
         .add_startup_system(setup_camera)
         .add_startup_system(spawn_snake)
         .add_system(snake_movement)
+        .add_system_set(
+            SystemSet::new()
+                .with_run_criteria(FixedTimestep::step(1.0))
+                .with_system(food_spawner),
+        )
         .add_system_set_to_stage(
             CoreStage::PostUpdate,
             SystemSet::new()