//! Test rendering of many gizmos. use std::f32::consts::TAU; use bevy::{ diagnostic::{Diagnostic, DiagnosticsStore, FrameTimeDiagnosticsPlugin}, prelude::*, window::{PresentMode, WindowResolution}, winit::{UpdateMode, WinitSettings}, }; const SYSTEM_COUNT: u32 = 10; fn main() { let mut app = App::new(); app.add_plugins(( DefaultPlugins.set(WindowPlugin { primary_window: Some(Window { title: "Many Debug Lines".to_string(), present_mode: PresentMode::AutoNoVsync, resolution: WindowResolution::new(1920.0, 1080.0).with_scale_factor_override(1.0), ..default() }), ..default() }), FrameTimeDiagnosticsPlugin, )) .insert_resource(WinitSettings { focused_mode: UpdateMode::Continuous, unfocused_mode: UpdateMode::Continuous, }) .insert_resource(Config { line_count: 50_000, fancy: false, }) .add_systems(Startup, setup) .add_systems(Update, (input, ui_system)); for _ in 0..SYSTEM_COUNT { app.add_systems(Update, system); } app.run(); } #[derive(Resource, Debug)] struct Config { line_count: u32, fancy: bool, } fn input(mut config: ResMut<Config>, input: Res<ButtonInput<KeyCode>>) { if input.just_pressed(KeyCode::ArrowUp) { config.line_count += 10_000; } if input.just_pressed(KeyCode::ArrowDown) { config.line_count = config.line_count.saturating_sub(10_000); } if input.just_pressed(KeyCode::Space) { config.fancy = !config.fancy; } } fn system(config: Res<Config>, time: Res<Time>, mut draw: Gizmos) { if !config.fancy { for _ in 0..(config.line_count / SYSTEM_COUNT) { draw.line(Vec3::NEG_Y, Vec3::Y, Color::BLACK); } } else { for i in 0..(config.line_count / SYSTEM_COUNT) { let angle = i as f32 / (config.line_count / SYSTEM_COUNT) as f32 * TAU; let vector = Vec2::from(ops::sin_cos(angle)).extend(ops::sin(time.elapsed_secs())); let start_color = LinearRgba::rgb(vector.x, vector.z, 0.5); let end_color = LinearRgba::rgb(-vector.z, -vector.y, 0.5); draw.line_gradient(vector, -vector, start_color, end_color); } } } fn setup(mut commands: Commands) { warn!(include_str!("warning_string.txt")); commands.spawn(( Camera3d::default(), Transform::from_xyz(3., 1., 5.).looking_at(Vec3::ZERO, Vec3::Y), )); commands.spawn(( Text::default(), Node { position_type: PositionType::Absolute, top: Val::Px(12.0), left: Val::Px(12.0), ..default() }, )); } fn ui_system(mut text: Single<&mut Text>, config: Res<Config>, diag: Res<DiagnosticsStore>) { let Some(fps) = diag .get(&FrameTimeDiagnosticsPlugin::FPS) .and_then(Diagnostic::smoothed) else { return; }; text.0 = format!( "Line count: {}\n\ FPS: {:.0}\n\n\ Controls:\n\ Up/Down: Raise or lower the line count.\n\ Spacebar: Toggle fancy mode.", config.line_count, fps, ); }