tetris: We have a grid...ish

src/bin/tetris/main.rs

@@ -5,19 +5,24 @@ fn main() {
         .add_plugins(BaseGamePlugin {
             name: "falling-block-rpg".into(),
             target_resolution: (640.0, 480.0).into(),
+            game_type: GameType::Two,
             ..default()
         })
         .add_systems(Startup, init_pieces)
         .add_systems(Update, (kb_movement.run_if(on_event::<KeyboardInput>), update_position))
+        .add_systems(Update, draw_grid)
+        .add_systems(Update, zoom_camera)
         .run();
 }
 
+const SCALE: f32 = 30.0;
+
 #[derive(Component, Default, Debug, Clone, Copy)]
 struct GridPosition { x: isize, y: isize }
 
 impl From<&GridPosition> for Vec3 {
     fn from(GridPosition { x, y }: &GridPosition) -> Vec3 {
-        Vec3::new((*x as f32) * 1.0, (*y as f32) * 1.0, -10.0)
+        Vec3::new((*x as f32) * SCALE, (*y as f32) * SCALE, 0.0)
     }
 }
 
@@ -38,11 +43,14 @@ impl std::ops::Add for GridPosition {
 fn init_pieces(
     mut commands: Commands,
     mut meshes: ResMut<Assets<Mesh>>,
-    mut materials: ResMut<Assets<StandardMaterial>>,
+    mut materials: ResMut<Assets<ColorMaterial>>,
 ) {
     commands.spawn((
-        Mesh3d(meshes.add(Cuboid::new(1.0, 1.0, 1.0))),
-        MeshMaterial3d(materials.add(Color::srgb_u8(124, 144, 255))),
+        Mesh2d(meshes.add(Rectangle::new(SCALE, SCALE))),
+        MeshMaterial2d(materials.add(ColorMaterial {
+            color: WHITE.into(),
+            ..default()
+        })),
         Transform::default(),
         GridPosition::default(),
     ));
@@ -84,3 +92,27 @@ fn kb_movement(mut events: EventReader<KeyboardInput>, mut query: Query<&mut Gri
         }
     });
 }
+
+fn draw_grid(
+    mut gizmos: Gizmos,
+) {
+    gizmos.grid_2d(
+        Isometry2d::IDENTITY,
+        UVec2::new(10, 20),
+        Vec2::new(SCALE, SCALE),
+        GREEN
+    ).outer_edges();
+}
+
+fn zoom_camera(
+    mut events: EventReader<MouseWheel>,
+    mut query: Single<&mut Transform, With<Camera>>,
+) {
+    events.read().for_each(|MouseWheel { unit, y, .. }| {
+        let movement = match unit {
+            MouseScrollUnit::Line => y * 1.0,
+            MouseScrollUnit::Pixel => y * 1.0,
+        };
+        query.translation.z += movement;
+    });
+}