From 23d32213ff8832d2c4360618eb511a0098153818 Mon Sep 17 00:00:00 2001
From: Alexander Foremny <aforemny@posteo.de>
Date: Sat, 23 Mar 2024 08:53:12 +0100
Subject: feat: camera movement

---
 src/client.rs | 25 +++++++++++++++++++++++++
 src/server.rs | 14 ++++++++------
 2 files changed, 33 insertions(+), 6 deletions(-)

diff --git a/src/client.rs b/src/client.rs
index 6fa6ff1..7f1220e 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -94,6 +94,7 @@ impl Plugin for ClientPlugin {
                         .chain(),
                 ),
             )
+            .add_systems(Update, move_camera)
             .add_systems(
                 FixedPreUpdate,
                 buffer_input.in_set(InputSystemSet::BufferInputs),
@@ -790,3 +791,27 @@ fn health_indicator_despawn(
         commands.entity(entity).despawn();
     }
 }
+
+const CAMERA_MOVEMENT_SPEED: f32 = 100.;
+
+fn move_camera(
+    mut cameras: Query<&mut Transform, With<Camera>>,
+    players: Query<(&PlayerId, &PlayerPosition, &Shape)>,
+    client_id: Res<ClientId>,
+    time: Res<Time>,
+) {
+    let Some(player_position) = player_position(&client_id, &players) else {
+        return;
+    };
+    let dt = time.delta().as_secs_f32();
+    for mut transform in cameras.iter_mut() {
+        let direction = (Vec3::new(
+            player_position.0.x,
+            player_position.0.y,
+            transform.translation.z,
+        ) - transform.translation)
+            .normalize_or_zero();
+        transform.translation +=
+            (dt * CAMERA_MOVEMENT_SPEED).min(direction.length()) * direction.normalize_or_zero();
+    }
+}
diff --git a/src/server.rs b/src/server.rs
index 0a5e4cf..f426b38 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -112,14 +112,16 @@ impl Plugin for ServerPlugin {
     }
 }
 
+const TOWER_DISTANCE: f32 = 400.;
+
 fn setup(mut commands: Commands, mut entity_map: ResMut<EntityMap>) {
     let [blue_tower_1, blue_tower_2, blue_tower_3, blue_nexus, red_tower_1, red_tower_2, red_tower_3, red_nexus] =
         generate_client_ids::<8>(&entity_map).into();
 
-    for (n, client_id) in [(1, blue_tower_1), (2, blue_tower_2), (3, blue_tower_3)].iter() {
+    for (n, client_id) in [(0, blue_tower_1), (1, blue_tower_2), (2, blue_tower_3)].iter() {
         let entity = commands.spawn(TowerBundle::new(
             *client_id,
-            Vec2::new(0., *n as f32 * 250.),
+            Vec2::new(0., TOWER_DISTANCE / 2. + *n as f32 * TOWER_DISTANCE),
             Faction::Blue,
         ));
         entity_map.0.insert(*client_id, entity.id());
@@ -128,16 +130,16 @@ fn setup(mut commands: Commands, mut entity_map: ResMut<EntityMap>) {
         let client_id = blue_nexus;
         let entity = commands.spawn(NexusBundle::new(
             client_id,
-            Vec2::new(0., 1000.0),
+            Vec2::new(0., TOWER_DISTANCE / 2. + 3. * TOWER_DISTANCE),
             Faction::Blue,
         ));
         entity_map.0.insert(client_id, entity.id());
     }
 
-    for (n, client_id) in [(1, red_tower_1), (2, red_tower_2), (3, red_tower_3)].iter() {
+    for (n, client_id) in [(0, red_tower_1), (1, red_tower_2), (2, red_tower_3)].iter() {
         let entity = commands.spawn(TowerBundle::new(
             *client_id,
-            Vec2::new(0., *n as f32 * -250.),
+            Vec2::new(0., -TOWER_DISTANCE / 2. - *n as f32 * TOWER_DISTANCE),
             Faction::Red,
         ));
         entity_map.0.insert(*client_id, entity.id());
@@ -146,7 +148,7 @@ fn setup(mut commands: Commands, mut entity_map: ResMut<EntityMap>) {
         let client_id = red_nexus;
         let entity = commands.spawn(NexusBundle::new(
             client_id,
-            Vec2::new(0., -1000.0),
+            Vec2::new(0., -TOWER_DISTANCE / 2. - 3. * TOWER_DISTANCE),
             Faction::Red,
         ));
         entity_map.0.insert(client_id, entity.id());
-- 
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