95 lines
2.6 KiB
Rust
95 lines
2.6 KiB
Rust
use bevy::{prelude::*, text::FontAtlasSet};
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fn main() {
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App::build()
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.init_resource::<State>()
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.add_default_plugins()
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.add_startup_system(setup.system())
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.add_system(text_update_system.system())
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.add_system(atlas_render_system.system())
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.run();
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}
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struct State {
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added: bool,
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handle: Handle<Font>,
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timer: Timer,
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}
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impl Default for State {
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fn default() -> Self {
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Self {
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added: false,
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handle: Handle::default(),
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timer: Timer::from_seconds(0.05),
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}
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}
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}
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fn atlas_render_system(
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command_buffer: &mut CommandBuffer,
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mut state: ResMut<State>,
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mut materials: ResMut<Assets<ColorMaterial>>,
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font_atlas_sets: Res<Assets<FontAtlasSet>>,
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texture_atlases: Res<Assets<TextureAtlas>>,
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) {
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if state.added {
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return;
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}
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if let Some(set) = font_atlas_sets.get(&state.handle.as_handle::<FontAtlasSet>()) {
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for (_size, atlas) in set.iter() {
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state.added = true;
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let atlas = texture_atlases.get(&atlas.texture_atlas).unwrap();
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command_buffer.build().add_entity(SpriteEntity {
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material: materials.add(atlas.texture.into()),
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quad: Quad {
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position: Vec2::new(-300.0, 0.),
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..Default::default()
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},
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sprite: Sprite { scale: 1.0 },
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..Default::default()
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});
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break;
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}
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}
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}
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fn text_update_system(mut state: ResMut<State>, time: Res<Time>, mut label: ComMut<Label>) {
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state.timer.tick(time.delta_seconds);
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if state.timer.finished {
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label.text = format!("{}", rand::random::<u8>() as char);
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state.timer.reset();
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}
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}
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fn setup(
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command_buffer: &mut CommandBuffer,
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asset_server: Res<AssetServer>,
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mut state: ResMut<State>,
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) {
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let font_handle = asset_server.load("assets/fonts/FiraSans-Bold.ttf").unwrap();
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state.handle = font_handle;
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command_buffer
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.build()
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// 2d camera
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.add_entity(OrthographicCameraEntity::default())
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.add_entity(OrthographicCameraEntity::ui())
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// texture
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.add_entity(LabelEntity {
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node: Node::new(
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math::vec2(0.0, 0.0),
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Anchors::TOP_LEFT,
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Margins::new(0.0, 250.0, 0.0, 60.0),
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),
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label: Label {
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text: "a".to_string(),
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font: font_handle,
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style: TextStyle {
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font_size: 60.0,
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color: Color::WHITE,
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},
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},
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..Default::default()
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});
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}
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