b3aff9a7b1
# Objective
- Improve documentation.
- Provide helper functions for common uses of `Windows` relating to getting the primary `Window`.
- Reduce repeated `Window` code.
# Solution
- Adds infallible `primary()` and `primary_mut()` functions with standard error text. This replaces the commonly used `get_primary().unwrap()` seen throughout bevy which has inconsistent or nonexistent error messages.
- Adds `scale_factor(WindowId)` to replace repeated code blocks throughout.
# Considerations
- The added functions can panic if the primary window does not exist.
- It is very uncommon for the primary window to not exist, as seen by the regular use of `get_primary().unwrap()`. Most users will have a single window and will need to reference the primary window in their code multiple times.
- The panic provides a consistent error message to make this class of error easy to spot from the panic text.
- This follows the established standard of short names for infallible-but-unlikely-to-panic functions in bevy.
- Removes line noise for common usage of `Windows`.
96 lines
3.0 KiB
Rust
96 lines
3.0 KiB
Rust
use bevy::{input::touch::TouchPhase, prelude::*, window::WindowMode};
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// the `bevy_main` proc_macro generates the required ios boilerplate
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#[bevy_main]
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fn main() {
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App::new()
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.insert_resource(WindowDescriptor {
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resizable: false,
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mode: WindowMode::BorderlessFullscreen,
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..default()
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})
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.insert_resource(Msaa { samples: 4 })
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.add_plugins(DefaultPlugins)
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.add_startup_system(setup_scene)
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.add_startup_system(setup_music)
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.add_system(touch_camera)
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.run();
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}
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fn touch_camera(
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windows: ResMut<Windows>,
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mut touches: EventReader<TouchInput>,
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mut camera: Query<&mut Transform, With<Camera>>,
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mut last_position: Local<Option<Vec2>>,
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) {
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for touch in touches.iter() {
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if touch.phase == TouchPhase::Started {
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*last_position = None;
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}
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if let Some(last_position) = *last_position {
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let window = windows.primary();
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let mut transform = camera.single_mut();
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*transform = Transform::from_xyz(
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transform.translation.x
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+ (touch.position.x - last_position.x) / window.width() * 5.0,
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transform.translation.y,
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transform.translation.z
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+ (touch.position.y - last_position.y) / window.height() * 5.0,
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)
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.looking_at(Vec3::ZERO, Vec3::Y);
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}
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*last_position = Some(touch.position);
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}
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}
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/// set up a simple 3D scene
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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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// plane
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commands.spawn_bundle(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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material: materials.add(Color::rgb(0.1, 0.2, 0.1).into()),
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..default()
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});
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// cube
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commands.spawn_bundle(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
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material: materials.add(Color::rgb(0.5, 0.4, 0.3).into()),
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transform: Transform::from_xyz(0.0, 0.5, 0.0),
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..default()
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});
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// sphere
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commands.spawn_bundle(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Icosphere {
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subdivisions: 4,
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radius: 0.5,
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})),
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material: materials.add(Color::rgb(0.1, 0.4, 0.8).into()),
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transform: Transform::from_xyz(1.5, 1.5, 1.5),
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..default()
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});
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// light
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commands.spawn_bundle(PointLightBundle {
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transform: Transform::from_xyz(4.0, 8.0, 4.0),
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point_light: PointLight {
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intensity: 5000.0,
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shadows_enabled: true,
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..default()
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},
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..default()
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});
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// camera
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commands.spawn_bundle(PerspectiveCameraBundle {
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transform: Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),
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..default()
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});
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}
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fn setup_music(asset_server: Res<AssetServer>, audio: Res<Audio>) {
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let music = asset_server.load("sounds/Windless Slopes.ogg");
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audio.play(music);
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}
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