c2c19e5ae4
**Ready for review. Examples migration progress: 100%.** # Objective - Implement https://github.com/bevyengine/bevy/discussions/15014 ## Solution This implements [cart's proposal](https://github.com/bevyengine/bevy/discussions/15014#discussioncomment-10574459) faithfully except for one change. I separated `TextSpan` from `TextSpan2d` because `TextSpan` needs to require the `GhostNode` component, which is a `bevy_ui` component only usable by UI. Extra changes: - Added `EntityCommands::commands_mut` that returns a mutable reference. This is a blocker for extension methods that return something other than `self`. Note that `sickle_ui`'s `UiBuilder::commands` returns a mutable reference for this reason. ## Testing - [x] Text examples all work. --- ## Showcase TODO: showcase-worthy ## Migration Guide TODO: very breaking ### Accessing text spans by index Text sections are now text sections on different entities in a hierarchy, Use the new `TextReader` and `TextWriter` system parameters to access spans by index. Before: ```rust fn refresh_text(mut query: Query<&mut Text, With<TimeText>>, time: Res<Time>) { let text = query.single_mut(); text.sections[1].value = format_time(time.elapsed()); } ``` After: ```rust fn refresh_text( query: Query<Entity, With<TimeText>>, mut writer: UiTextWriter, time: Res<Time> ) { let entity = query.single(); *writer.text(entity, 1) = format_time(time.elapsed()); } ``` ### Iterating text spans Text spans are now entities in a hierarchy, so the new `UiTextReader` and `UiTextWriter` system parameters provide ways to iterate that hierarchy. The `UiTextReader::iter` method will give you a normal iterator over spans, and `UiTextWriter::for_each` lets you visit each of the spans. --------- Co-authored-by: ickshonpe <david.curthoys@googlemail.com> Co-authored-by: Carter Anderson <mcanders1@gmail.com>
87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
//! Shows how to render simple primitive shapes with a single color.
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//!
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//! You can toggle wireframes with the space bar except on wasm. Wasm does not support
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//! `POLYGON_MODE_LINE` on the gpu.
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use bevy::prelude::*;
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#[cfg(not(target_arch = "wasm32"))]
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use bevy::sprite::{Wireframe2dConfig, Wireframe2dPlugin};
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fn main() {
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let mut app = App::new();
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app.add_plugins((
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DefaultPlugins,
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#[cfg(not(target_arch = "wasm32"))]
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Wireframe2dPlugin,
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))
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.add_systems(Startup, setup);
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#[cfg(not(target_arch = "wasm32"))]
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app.add_systems(Update, toggle_wireframe);
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app.run();
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}
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const X_EXTENT: f32 = 900.;
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fn setup(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<ColorMaterial>>,
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) {
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commands.spawn(Camera2d);
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let shapes = [
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meshes.add(Circle::new(50.0)),
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meshes.add(CircularSector::new(50.0, 1.0)),
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meshes.add(CircularSegment::new(50.0, 1.25)),
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meshes.add(Ellipse::new(25.0, 50.0)),
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meshes.add(Annulus::new(25.0, 50.0)),
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meshes.add(Capsule2d::new(25.0, 50.0)),
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meshes.add(Rhombus::new(75.0, 100.0)),
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meshes.add(Rectangle::new(50.0, 100.0)),
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meshes.add(RegularPolygon::new(50.0, 6)),
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meshes.add(Triangle2d::new(
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Vec2::Y * 50.0,
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Vec2::new(-50.0, -50.0),
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Vec2::new(50.0, -50.0),
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)),
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];
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let num_shapes = shapes.len();
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for (i, shape) in shapes.into_iter().enumerate() {
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// Distribute colors evenly across the rainbow.
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let color = Color::hsl(360. * i as f32 / num_shapes as f32, 0.95, 0.7);
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commands.spawn((
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Mesh2d(shape),
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MeshMaterial2d(materials.add(color)),
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Transform::from_xyz(
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// Distribute shapes from -X_EXTENT/2 to +X_EXTENT/2.
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-X_EXTENT / 2. + i as f32 / (num_shapes - 1) as f32 * X_EXTENT,
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0.0,
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0.0,
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),
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));
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}
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#[cfg(not(target_arch = "wasm32"))]
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commands.spawn((
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Text::new("Press space to toggle wireframes"),
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Style {
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position_type: PositionType::Absolute,
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top: Val::Px(12.0),
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left: Val::Px(12.0),
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..default()
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},
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));
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}
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#[cfg(not(target_arch = "wasm32"))]
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fn toggle_wireframe(
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mut wireframe_config: ResMut<Wireframe2dConfig>,
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keyboard: Res<ButtonInput<KeyCode>>,
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) {
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if keyboard.just_pressed(KeyCode::Space) {
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wireframe_config.global = !wireframe_config.global;
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}
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}
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