Stand-in pick-up/put-down movement. Next: animationsgit diff HEAD~1

src/display2d.rs

@@ -28,9 +28,7 @@ impl Plugin for Display2dPlugin {
                 (
                     active_tile.run_if(in_state(GameState::Display2d)),
                     menu::exit_to_menu.run_if(in_state(GameState::Display2d)),
-                    select_piece
+                    select_piece.run_if(in_state(GameState::Display2d)),
-                        .run_if(in_state(GameState::Display2d))
-                        .run_if(not(any_with_component::<game::Selected>())),
                     move_piece
                         .run_if(in_state(GameState::Display2d))
                         .run_if(any_with_component::<game::Selected>()),

src/display3d.rs

@@ -1,9 +1,13 @@
+// TODO: Unify the selection logic
+// If you select in 2d, it should "be" selected in 3d.
+// And if you select in 3d, 2d is selected.
 use crate::{
     game::{Board, BoardIndex, Piece, Side},
     prelude::*,
 };
 use bevy::{
     core_pipeline::Skybox,
+    ecs::removal_detection::RemovedComponentReader,
     input::mouse::{MouseButtonInput, MouseMotion, MouseWheel},
     render::render_resource::{TextureViewDescriptor, TextureViewDimension},
     window::PrimaryWindow,
@@ -29,6 +33,8 @@ impl Plugin for Display3dPlugin {
                     select_3d
                         .run_if(in_state(GameState::Display3d))
                         .run_if(on_event::<MouseButtonInput>()),
+                    pick_up.run_if(any_component_added::<game::Selected>),
+                    put_down.run_if(any_component_removed::<game::Selected>()),
                 ),
             )
             .add_systems(
@@ -379,7 +385,7 @@ fn select_3d(
     mut events: EventReader<MouseButtonInput>,
     query: Query<(Entity, &Handle<Mesh>, &GlobalTransform)>,
     meshes: Res<Assets<Mesh>>,
-    cameras: Query<(&Camera, &GlobalTransform), With<Display3d>>,
+    cameras: Query<(&Camera, &GlobalTransform)>,
     windows: Query<&Window, With<PrimaryWindow>>,
     parents: Query<Entity, (With<game::Piece>, With<Display3d>)>,
     children: Query<&Children>,
@@ -440,6 +446,25 @@ fn selected_gizmo(
     })
 }
 
+fn pick_up(
+    mut events: Query<&mut Transform, (With<game::Piece>, With<Display3d>, Added<game::Selected>)>,
+) {
+    events.iter_mut().for_each(|mut transform| {
+        transform.translation += Vec3::Y;
+    });
+}
+
+fn put_down(
+    mut events: RemovedComponents<game::Selected>,
+    mut query: Query<&mut Transform, (With<game::Piece>, With<Display3d>)>,
+) {
+    events.iter().for_each(|entity| {
+        if let Ok(mut transform) = query.get_mut(entity) {
+            transform.translation -= Vec3::Y;
+        }
+    })
+}
+
 // Animations
 // * QueenPickup
 // * QueenPutDown