use bevy::{
diagnostic::{DiagnosticsStore, FrameTimeDiagnosticsPlugin},
prelude::*,
};
fn main() {
App::new()
.add_plugins((DefaultPlugins, FrameTimeDiagnosticsPlugin))
.add_systems(Startup, setup)
.add_systems(Update, (text_update_system, text_color_system))
.run();
}
#[derive(Component)]
struct FpsText;
#[derive(Component)]
struct ColorText;
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
commands.spawn(Camera2dBundle::default());
commands.spawn((
TextBundle::from_section(
"hello\nbevy!",
TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 100.0,
..default()
},
) .with_text_alignment(TextAlignment::Center)
.with_style(Style {
position_type: PositionType::Absolute,
bottom: Val::Px(5.0),
right: Val::Px(5.0),
..default()
}),
ColorText,
));
commands.spawn((
TextBundle::from_sections([
TextSection::new(
"FPS: ",
TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 60.0,
..default()
},
),
TextSection::from_style(if cfg!(feature = "default_font") {
TextStyle {
font_size: 60.0,
color: Color::GOLD,
..default()
}
} else {
TextStyle {
font: asset_server.load("fonts/FiraMono-Medium.ttf"),
font_size: 60.0,
color: Color::GOLD,
}
}),
]),
FpsText,
));
#[cfg(feature = "default_font")]
commands.spawn(
TextBundle::from("From an &str into a TextBundle with the default font!").with_style(
Style {
position_type: PositionType::Absolute,
bottom: Val::Px(5.0),
left: Val::Px(15.0),
..default()
},
),
);
#[cfg(not(feature = "default_font"))]
commands.spawn(
TextBundle::from_section(
"Default font disabled",
TextStyle {
font: asset_server.load("fonts/FiraMono-Medium.ttf"),
..default()
},
)
.with_style(Style {
position_type: PositionType::Absolute,
bottom: Val::Px(5.0),
left: Val::Px(15.0),
..default()
}),
);
}
fn text_color_system(time: Res<Time>, mut query: Query<&mut Text, With<ColorText>>) {
for mut text in &mut query {
let seconds = time.elapsed_seconds();
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,
};
}
}
fn text_update_system(
diagnostics: Res<DiagnosticsStore>,
mut query: Query<&mut Text, With<FpsText>>,
) {
for mut text in &mut query {
if let Some(fps) = diagnostics.get(FrameTimeDiagnosticsPlugin::FPS) {
if let Some(value) = fps.smoothed() {
text.sections[1].value = format!("{value:.2}");
}
}
}
}