many_gizmos.rs:
use std::f32::consts::TAU;
use bevy::{
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(angle.sin_cos()).extend(time.elapsed_seconds().sin());
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(Camera3dBundle {
transform: Transform::from_xyz(3., 1., 5.).looking_at(Vec3::ZERO, Vec3::Y),
..default()
});
commands.spawn(
TextBundle::from_section("", TextStyle::default()).with_style(Style {
position_type: PositionType::Absolute,
top: Val::Px(12.0),
left: Val::Px(12.0),
..default()
}),
);
}
fn ui_system(mut query: Query<&mut Text>, config: Res<Config>, diag: Res<DiagnosticsStore>) {
let mut text = query.single_mut();
let Some(fps) = diag
.get(&FrameTimeDiagnosticsPlugin::FPS)
.and_then(|fps| fps.smoothed())
else {
return;
};
text.sections[0].value = 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,
);
}