bevy/examples/dev_tools/fps_overlay.rs

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//! Showcase how to use and configure FPS overlay.
use bevy::{
dev_tools::fps_overlay::{FpsOverlayConfig, FpsOverlayPlugin},
prelude::*,
};
fn main() {
App::new()
.add_plugins((
DefaultPlugins,
FpsOverlayPlugin {
config: FpsOverlayConfig {
text_config: TextStyle {
// Here we define size of our overlay
font_size: 42.0,
// We can also change color of the overlay
color: Color::srgb(0.0, 1.0, 0.0),
// If we want, we can use a custom font
font: default(),
},
enabled: true,
},
},
))
.add_systems(Startup, setup)
.add_systems(Update, customize_config)
.run();
}
fn setup(mut commands: Commands) {
// We need to spawn a camera (2d or 3d) to see the overlay
commands.spawn(Camera2d);
// Instruction text
commands
.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.0),
height: Val::Percent(100.0),
align_items: AlignItems::Center,
justify_content: JustifyContent::Center,
..default()
},
..default()
})
.with_children(|c| {
c.spawn(TextBundle::from_section(
concat!(
"Press 1 to change color of the overlay.\n",
"Press 2 to change size of the overlay.\n",
"Press 3 to toggle the overlay."
),
TextStyle::default(),
));
});
}
fn customize_config(input: Res<ButtonInput<KeyCode>>, mut overlay: ResMut<FpsOverlayConfig>) {
if input.just_pressed(KeyCode::Digit1) {
// Changing resource will affect overlay
overlay.text_config.color = Color::srgb(1.0, 0.0, 0.0);
}
if input.just_pressed(KeyCode::Digit2) {
overlay.text_config.font_size -= 2.0;
}
if input.just_pressed(KeyCode::Digit3) {
overlay.enabled = !overlay.enabled;
}
}