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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| use bevy::{prelude::*, utils::Duration}; | ||
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| const SCALE_TIME: u64 = 400; | ||
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| #[derive(Debug, Clone, Copy, Hash, PartialEq, Eq, SystemLabel)] | ||
| struct ApplyScaling; | ||
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| /// This example illustrates the various features of Bevy UI. | ||
| fn main() { | ||
| App::new() | ||
| .add_plugins(DefaultPlugins) | ||
| .insert_resource(TargetScale { | ||
| target_scale: 1.0, | ||
| start_scale: 1.0, | ||
| target_time: Timer::new(Duration::from_millis(SCALE_TIME), false), | ||
| }) | ||
| .add_startup_system(setup) | ||
| .add_system(apply_scaling.label(ApplyScaling)) | ||
| .add_system(change_scaling.before(ApplyScaling)) | ||
| .run(); | ||
| } | ||
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| fn setup( | ||
| mut commands: Commands, | ||
| asset_server: ResMut<AssetServer>, | ||
| mut materials: ResMut<Assets<ColorMaterial>>, | ||
| ) { | ||
| // ui camera | ||
| commands.spawn_bundle(UiCameraBundle::default()); | ||
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| let text_style = TextStyle { | ||
| font: asset_server.load("fonts/FiraMono-Medium.ttf"), | ||
| font_size: 16., | ||
| color: Color::BLACK, | ||
| }; | ||
|
|
||
| // root node | ||
| commands | ||
| .spawn_bundle(NodeBundle { | ||
| style: Style { | ||
| size: Size::new(Val::Percent(50.0), Val::Percent(50.0)), | ||
| position_type: PositionType::Absolute, | ||
| position: Rect { | ||
| left: Val::Percent(25.), | ||
| top: Val::Percent(25.), | ||
| ..Default::default() | ||
| }, | ||
| justify_content: JustifyContent::SpaceAround, | ||
| align_items: AlignItems::Center, | ||
| ..Default::default() | ||
| }, | ||
| material: materials.add(Color::ANTIQUE_WHITE.into()), | ||
| ..Default::default() | ||
| }) | ||
| .with_children(|parent| { | ||
| parent | ||
| .spawn_bundle(NodeBundle { | ||
| style: Style { | ||
| size: Size::new(Val::Px(40.), Val::Px(40.)), | ||
| ..Default::default() | ||
| }, | ||
| material: materials.add(Color::RED.into()), | ||
| ..Default::default() | ||
| }) | ||
| .with_children(|parent| { | ||
| parent.spawn_bundle(TextBundle { | ||
| text: Text::with_section("Size!", text_style, TextAlignment::default()), | ||
| ..Default::default() | ||
| }); | ||
| }); | ||
| parent.spawn_bundle(NodeBundle { | ||
| style: Style { | ||
| size: Size::new(Val::Percent(15.), Val::Percent(15.)), | ||
| ..Default::default() | ||
| }, | ||
| material: materials.add(Color::BLUE.into()), | ||
| ..Default::default() | ||
| }); | ||
| parent.spawn_bundle(ImageBundle { | ||
| style: Style { | ||
| size: Size::new(Val::Px(30.0), Val::Px(30.0)), | ||
| ..Default::default() | ||
| }, | ||
| material: materials.add(asset_server.load("branding/icon.png").into()), | ||
| ..Default::default() | ||
| }); | ||
| }); | ||
| } | ||
|
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| fn change_scaling(input: Res<Input<KeyCode>>, mut ui_scale: ResMut<TargetScale>) { | ||
| if input.just_pressed(KeyCode::Up) { | ||
| let scale = (ui_scale.target_scale * 2.0).min(8.); | ||
| ui_scale.set_scale(scale); | ||
| info!("Scaling up! Scale: {}", ui_scale.target_scale); | ||
| } | ||
| if input.just_pressed(KeyCode::Down) { | ||
| let scale = (ui_scale.target_scale / 2.0).max(1. / 8.); | ||
| ui_scale.set_scale(scale); | ||
| info!("Scaling down! Scale: {}", ui_scale.target_scale); | ||
| } | ||
| } | ||
|
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| struct TargetScale { | ||
| target_scale: f64, | ||
| start_scale: f64, | ||
| target_time: Timer, | ||
| } | ||
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| impl TargetScale { | ||
| fn set_scale(&mut self, scale: f64) { | ||
| self.start_scale = self.current_scale(); | ||
| self.target_scale = scale; | ||
| self.target_time.reset(); | ||
| } | ||
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| fn current_scale(&self) -> f64 { | ||
| let completion = self.target_time.percent(); | ||
| let multiplier = ease_in_expo(completion as f64); | ||
| self.start_scale + (self.target_scale - self.start_scale) * multiplier | ||
| } | ||
| } | ||
|
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| fn apply_scaling( | ||
| time: Res<Time>, | ||
| mut target_scale: ResMut<TargetScale>, | ||
| mut ui_scale: ResMut<UiScale>, | ||
| ) { | ||
| let timer = target_scale.target_time.tick(time.delta()); | ||
| if timer.finished() && !timer.just_finished() { | ||
| return; | ||
| } | ||
|
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| ui_scale.scale = target_scale.current_scale(); | ||
| } | ||
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| fn ease_in_expo(x: f64) -> f64 { | ||
| if x == 0. { | ||
| 0. | ||
| } else { | ||
| (2.0f64).powf(10. * x - 10.) | ||
| } | ||
| } |