57086d4416
# Objective Since we are planning to remove the need to derive both `Event` and `EntityEvent` in 0.17 either way, I'm choosing to do the easy thing in this PR so we can get the churn out of the way early. Context from [discord](https://discordapp.com/channels/691052431525675048/1383928409784193024/1393463673137401946). Related to, and will conflict slightly with #20101. ## Solution - Derive `Event` as part of the `EntityEvent` derive - Remove any `Event` derives that were made unnecessary - Update release notes
103 lines
2.5 KiB
Rust
103 lines
2.5 KiB
Rust
//! Demonstrate how to use animation events.
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use bevy::{
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color::palettes::css::{ALICE_BLUE, BLACK, CRIMSON},
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core_pipeline::bloom::Bloom,
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prelude::*,
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};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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.add_systems(Update, animate_text_opacity)
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.add_observer(edit_message)
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.run();
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}
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#[derive(Component)]
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struct MessageText;
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#[derive(EntityEvent, Clone)]
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struct MessageEvent {
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value: String,
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color: Color,
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}
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fn edit_message(
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trigger: On<MessageEvent>,
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text: Single<(&mut Text2d, &mut TextColor), With<MessageText>>,
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) {
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let (mut text, mut color) = text.into_inner();
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text.0 = trigger.event().value.clone();
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color.0 = trigger.event().color;
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}
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fn setup(
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mut commands: Commands,
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mut animations: ResMut<Assets<AnimationClip>>,
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mut graphs: ResMut<Assets<AnimationGraph>>,
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) {
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// Camera
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commands.spawn((
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Camera2d,
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Camera {
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clear_color: ClearColorConfig::Custom(BLACK.into()),
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..Default::default()
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},
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Bloom {
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intensity: 0.4,
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..Bloom::NATURAL
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},
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));
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// The text that will be changed by animation events.
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commands.spawn((
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MessageText,
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Text2d::default(),
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TextFont {
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font_size: 119.0,
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..default()
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},
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TextColor(Color::NONE),
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));
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// Create a new animation clip.
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let mut animation = AnimationClip::default();
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// This is only necessary if you want the duration of the
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// animation to be longer than the last event in the clip.
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animation.set_duration(2.0);
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// Add events at the specified time.
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animation.add_event(
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0.0,
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MessageEvent {
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value: "HELLO".into(),
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color: ALICE_BLUE.into(),
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},
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);
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animation.add_event(
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1.0,
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MessageEvent {
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value: "BYE".into(),
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color: CRIMSON.into(),
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},
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);
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// Create the animation graph.
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let (graph, animation_index) = AnimationGraph::from_clip(animations.add(animation));
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let mut player = AnimationPlayer::default();
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player.play(animation_index).repeat();
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commands.spawn((AnimationGraphHandle(graphs.add(graph)), player));
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}
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// Slowly fade out the text opacity.
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fn animate_text_opacity(mut colors: Query<&mut TextColor>, time: Res<Time>) {
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for mut color in &mut colors {
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let a = color.0.alpha();
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color.0.set_alpha(a - time.delta_secs());
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}
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}
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