font and cash ui

src/cash.rs

@@ -5,8 +5,34 @@ use bevy::prelude::*;
 #[require(Transform)]
 pub struct Cash;
 
+#[derive(Component, Reflect, Default)]
+#[reflect(Component)]
+struct CashText;
+
+#[derive(Resource, Reflect, Default)]
+pub struct CashResource {
+    pub cash: i32,
+}
+
+#[derive(Event)]
+pub struct CashCollectEvent;
+
 pub fn plugin(app: &mut App) {
-    app.add_systems(Update, rotate);
+    app.init_resource::<CashResource>();
+    app.add_systems(Startup, setup);
+    app.add_systems(Update, (rotate, update_ui));
+    app.add_observer(on_collect);
+}
+
+fn on_collect(
+    _trigger: Trigger<CashCollectEvent>,
+    mut commands: Commands,
+    mut cash: ResMut<CashResource>,
+    asset_server: Res<AssetServer>,
+) {
+    commands.spawn(AudioPlayer::new(asset_server.load("sfx/effects/cash.ogg")));
+
+    cash.cash += 100;
 }
 
 fn rotate(time: Res<Time>, mut query: Query<&mut Transform, With<Cash>>) {
@@ -14,3 +40,37 @@ fn rotate(time: Res<Time>, mut query: Query<&mut Transform, With<Cash>>) {
         transform.rotate(Quat::from_rotation_y(time.delta_secs()));
     }
 }
+
+fn update_ui(
+    cash: Res<CashResource>,
+    text: Query<Entity, With<CashText>>,
+    mut writer: TextUiWriter,
+) {
+    if cash.is_changed() {
+        let Some(text) = text.iter().next() else {
+            return;
+        };
+
+        *writer.text(text, 0) = cash.cash.to_string();
+    }
+}
+
+fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+    commands.spawn((
+        Text::new("0"),
+        CashText,
+        TextFont {
+            font: asset_server.load("font.ttf"),
+            font_size: 34.0,
+            ..default()
+        },
+        TextColor(Color::Srgba(Srgba::rgb(0., 1., 0.))),
+        TextLayout::new_with_justify(JustifyText::Center),
+        Node {
+            position_type: PositionType::Absolute,
+            bottom: Val::Px(40.0),
+            left: Val::Px(100.0),
+            ..default()
+        },
+    ));
+}