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https://github.com/bevyengine/bevy
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# Objective - A `Trigger` has multiple associated `Entity`s - the entity observing the event, and the entity that was targeted by the event. - The field `entity: Entity` encodes no semantic information about what the entity is used for, you can already tell that it's an `Entity` by the type signature! ## Solution - Rename `trigger.entity()` to `trigger.target()` --- ## Changelog - `Trigger`s are associated with multiple entities. `Trigger::entity()` has been renamed to `Trigger::target()` to reflect the semantics of the entity being returned. ## Migration Guide - Rename `Trigger::entity()` to `Trigger::target()`. - Rename `ObserverTrigger::entity` to `ObserverTrigger::target`
88 lines
2.7 KiB
Rust
88 lines
2.7 KiB
Rust
//! A simple scene to demonstrate picking events for UI and mesh entities.
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use bevy::prelude::*;
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fn main() {
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App::new()
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// Unlike UiPickingPlugin, MeshPickingPlugin is not a default plugin
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.add_plugins((DefaultPlugins, MeshPickingPlugin))
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.add_systems(Startup, setup_scene)
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.run();
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}
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fn setup_scene(
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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commands
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.spawn((
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Text::new("Click Me to get a box\nDrag cubes to rotate"),
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Node {
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position_type: PositionType::Absolute,
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top: Val::Percent(12.0),
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left: Val::Percent(12.0),
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..default()
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},
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))
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.observe(on_click_spawn_cube)
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.observe(
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|out: Trigger<Pointer<Out>>, mut texts: Query<&mut TextColor>| {
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let mut text_color = texts.get_mut(out.target()).unwrap();
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text_color.0 = Color::WHITE;
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},
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)
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.observe(
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|over: Trigger<Pointer<Over>>, mut texts: Query<&mut TextColor>| {
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let mut color = texts.get_mut(over.target()).unwrap();
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color.0 = bevy::color::palettes::tailwind::CYAN_400.into();
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},
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);
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// Base
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commands.spawn((
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Mesh3d(meshes.add(Circle::new(4.0))),
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MeshMaterial3d(materials.add(Color::WHITE)),
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Transform::from_rotation(Quat::from_rotation_x(-std::f32::consts::FRAC_PI_2)),
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));
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// Light
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commands.spawn((
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PointLight {
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shadows_enabled: true,
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..default()
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},
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Transform::from_xyz(4.0, 8.0, 4.0),
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));
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// Camera
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commands.spawn((
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Camera3d::default(),
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Transform::from_xyz(-2.5, 4.5, 9.0).looking_at(Vec3::ZERO, Vec3::Y),
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));
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}
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fn on_click_spawn_cube(
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_click: Trigger<Pointer<Click>>,
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mut commands: Commands,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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mut num: Local<usize>,
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) {
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commands
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.spawn((
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Mesh3d(meshes.add(Cuboid::new(0.5, 0.5, 0.5))),
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MeshMaterial3d(materials.add(Color::srgb_u8(124, 144, 255))),
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Transform::from_xyz(0.0, 0.25 + 0.55 * *num as f32, 0.0),
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))
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// With the MeshPickingPlugin added, you can add pointer event observers to meshes:
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.observe(on_drag_rotate);
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*num += 1;
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}
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fn on_drag_rotate(drag: Trigger<Pointer<Drag>>, mut transforms: Query<&mut Transform>) {
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if let Ok(mut transform) = transforms.get_mut(drag.target()) {
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transform.rotate_y(drag.delta.x * 0.02);
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transform.rotate_x(drag.delta.y * 0.02);
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}
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}
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