use bevy::{
color::palettes::css::GOLD,
diagnostic::{DiagnosticsStore, FrameTimeDiagnosticsPlugin},
prelude::*,
};
fn main() {
App::new()
.add_plugins((DefaultPlugins, FrameTimeDiagnosticsPlugin::default()))
.add_systems(Startup, setup)
.add_systems(Update, (text_update_system, text_color_system))
.run();
}
#[derive(Component)]
struct FpsText;
#[derive(Component)]
struct AnimatedText;
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
commands.spawn(Camera2d);
commands.spawn((
Text::new("hello\nbevy!"),
TextFont {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 67.0,
..default()
},
TextShadow::default(),
TextLayout::new_with_justify(JustifyText::Center),
Node {
position_type: PositionType::Absolute,
bottom: Val::Px(5.0),
right: Val::Px(5.0),
..default()
},
AnimatedText,
));
commands
.spawn((
Text::new("FPS: "),
TextFont {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 42.0,
..default()
},
))
.with_child((
TextSpan::default(),
if cfg!(feature = "default_font") {
(
TextFont {
font_size: 33.0,
..default()
},
TextColor(GOLD.into()),
)
} else {
(
TextFont {
font: asset_server.load("fonts/FiraMono-Medium.ttf"),
font_size: 33.0,
..Default::default()
},
TextColor(GOLD.into()),
)
},
FpsText,
));
#[cfg(feature = "default_font")]
commands.spawn((
Text::new("From an &str into a Text with the default font!"),
Node {
position_type: PositionType::Absolute,
bottom: Val::Px(5.0),
left: Val::Px(15.0),
..default()
},
));
#[cfg(not(feature = "default_font"))]
commands.spawn((
Text::new("Default font disabled"),
TextFont {
font: asset_server.load("fonts/FiraMono-Medium.ttf"),
..default()
},
Node {
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 TextColor, With<AnimatedText>>) {
for mut text_color in &mut query {
let seconds = time.elapsed_secs();
text_color.0 = Color::srgb(
ops::sin(1.25 * seconds) / 2.0 + 0.5,
ops::sin(0.75 * seconds) / 2.0 + 0.5,
ops::sin(0.50 * seconds) / 2.0 + 0.5,
);
}
}
fn text_update_system(
diagnostics: Res<DiagnosticsStore>,
mut query: Query<&mut TextSpan, With<FpsText>>,
) {
for mut span in &mut query {
if let Some(fps) = diagnostics.get(&FrameTimeDiagnosticsPlugin::FPS) {
if let Some(value) = fps.smoothed() {
**span = format!("{value:.2}");
}
}
}
}