Capture the Flag Example Using Entity Layers

[dyc3]

Objective

Created to test out the visibility layer API in #424

requires #424

Solution

Added a ctf example, where only the players on your team are glowing.

Currently somewhat bugged.

[dyc3]

This diff fixes the entity visibility bug, but I'm not applying it here because it needs to be fixed in #424 .

diff

diff --git a/examples/ctf.rs b/examples/ctf.rs
index 97c6a3f..6d88f7b 100644
--- a/examples/ctf.rs
+++ b/examples/ctf.rs
@@ -555,6 +555,7 @@ fn do_team_selector_portals(
             &mut Client,
             &mut VisibleEntityLayers,
             &UniqueId,
+            Option<&JoiningTeam>,
         ),
         Without<Team>,
     >,
@@ -573,6 +574,7 @@ fn do_team_selector_portals(
             mut client,
             mut ent_layers,
             unique_id,
+            joining,
         ) = player;
         if pos.0.y < SPAWN_BOX[1] as f64 - 5.0 {
             pos.0 = SPAWN_POS.into();
@@ -588,6 +590,13 @@ fn do_team_selector_portals(
         };
 
         if let Some(team) = team {
+            let main_layer = main_layers.single();
+            ent_layers.as_mut().0.remove(&main_layer);
+            if joining.is_none() {
+                commands.entity(player).insert(JoiningTeam);
+                return;
+            }
+
             *game_mode = GameMode::Survival;
             let mut inventory = Inventory::new(InventoryKind::Player);
             inventory.set_slot(36, Some(ItemStack::new(ItemKind::WoodenSword, 1, None)));
@@ -617,8 +626,6 @@ fn do_team_selector_portals(
             let chat_text: Text = "You are on team ".into_text() + team.team_text() + "!";
             client.send_chat_message(chat_text);
 
-            let main_layer = main_layers.single();
-            ent_layers.as_mut().0.remove(&main_layer);
             for t in Team::iter() {
                 let enemy_layer = ctf_layers.enemy_layers[&t];
                 if t == team {
@@ -650,10 +657,17 @@ fn do_team_selector_portals(
                 ..Default::default()
             });
             player_enemy.insert(ClonedEntity(player));
+
+            commands.entity(player).remove::<JoiningTeam>();
         }
     }
 }
 
+/// Used to delay spawning the cloned player by one tick.
+#[derive(Component)]
+#[component(storage = "SparseSet")]
+struct JoiningTeam;
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 struct TriggerArea {
     pub a: BlockPos,