use bevy::{
diagnostic::{Diagnostics, FrameTimeDiagnosticsPlugin},
prelude::*,
};
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_plugin(FrameTimeDiagnosticsPlugin::default())
.add_startup_system(setup)
.add_system(text_update_system)
.add_system(text_color_system)
.run();
}
#[derive(Component)]
struct FpsText;
#[derive(Component)]
struct ColorText;
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
commands.spawn_bundle(UiCameraBundle::default());
commands
.spawn_bundle(TextBundle {
style: Style {
align_self: AlignSelf::FlexEnd,
position_type: PositionType::Absolute,
position: Rect {
bottom: Val::Px(5.0),
right: Val::Px(15.0),
..default()
},
..default()
},
text: Text::with_section(
"hello\nbevy!",
TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 100.0,
color: Color::WHITE,
},
TextAlignment {
horizontal: HorizontalAlign::Center,
..default()
},
),
..default()
})
.insert(ColorText);
commands
.spawn_bundle(TextBundle {
style: Style {
align_self: AlignSelf::FlexEnd,
..default()
},
text: Text {
sections: vec![
TextSection {
value: "FPS: ".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 60.0,
color: Color::WHITE,
},
},
TextSection {
value: "".to_string(),
style: TextStyle {
font: asset_server.load("fonts/FiraMono-Medium.ttf"),
font_size: 60.0,
color: Color::GOLD,
},
},
],
..default()
},
..default()
})
.insert(FpsText);
}
fn text_update_system(diagnostics: Res<Diagnostics>, mut query: Query<&mut Text, With<FpsText>>) {
for mut text in query.iter_mut() {
if let Some(fps) = diagnostics.get(FrameTimeDiagnosticsPlugin::FPS) {
if let Some(average) = fps.average() {
text.sections[1].value = format!("{:.2}", average);
}
}
}
}
fn text_color_system(time: Res<Time>, mut query: Query<&mut Text, With<ColorText>>) {
for mut text in query.iter_mut() {
let seconds = time.seconds_since_startup() as f32;
text.sections[0].style.color = Color::Rgba {
red: (1.25 * seconds).sin() / 2.0 + 0.5,
green: (0.75 * seconds).sin() / 2.0 + 0.5,
blue: (0.50 * seconds).sin() / 2.0 + 0.5,
alpha: 1.0,
};
}
}