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text_debug.rs
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text_debug.rs
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//! Shows various text layout options.
use bevy::{
diagnostic::{Diagnostics, FrameTimeDiagnosticsPlugin},
prelude::*,
window::{PresentMode, WindowPlugin},
};
fn main() {
App::new()
.add_plugins(DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
present_mode: PresentMode::AutoNoVsync,
..default()
}),
..default()
}))
.add_plugin(FrameTimeDiagnosticsPlugin)
.add_startup_system(infotext_system)
.add_system(change_text_system)
.run();
}
#[derive(Component)]
struct TextChanges;
fn infotext_system(mut commands: Commands, asset_server: Res<AssetServer>) {
let font = asset_server.load("fonts/FiraSans-Bold.ttf");
commands.spawn(Camera2dBundle::default());
commands.spawn(
TextBundle::from_section(
"This is\ntext with\nline breaks\nin the top left",
TextStyle {
font: font.clone(),
font_size: 50.0,
color: Color::WHITE,
},
)
.with_style(Style {
position_type: PositionType::Absolute,
position: UiRect {
top: Val::Px(5.0),
left: Val::Px(15.0),
..default()
},
..default()
}),
);
commands.spawn(TextBundle::from_section(
"This text is very long, has a limited width, is centred, is positioned in the top right and is also coloured pink.",
TextStyle {
font: font.clone(),
font_size: 50.0,
color: Color::rgb(0.8, 0.2, 0.7),
},
)
.with_text_alignment(TextAlignment::Center)
.with_style(Style {
position_type: PositionType::Absolute,
position: UiRect {
top: Val::Px(5.0),
right: Val::Px(15.0),
..default()
},
max_size: Size {
width: Val::Px(400.),
height: Val::Undefined,
},
..default()
})
);
commands.spawn((
TextBundle::from_sections([
TextSection::new(
"This text changes in the bottom right",
TextStyle {
font: font.clone(),
font_size: 30.0,
color: Color::WHITE,
},
),
TextSection::new(
"\nThis text changes in the bottom right - ",
TextStyle {
font: font.clone(),
font_size: 30.0,
color: Color::RED,
},
),
TextSection::from_style(TextStyle {
font: font.clone(),
font_size: 30.0,
color: Color::ORANGE_RED,
}),
TextSection::new(
" fps, ",
TextStyle {
font: font.clone(),
font_size: 30.0,
color: Color::YELLOW,
},
),
TextSection::from_style(TextStyle {
font: font.clone(),
font_size: 30.0,
color: Color::GREEN,
}),
TextSection::new(
" ms/frame",
TextStyle {
font: font.clone(),
font_size: 30.0,
color: Color::BLUE,
},
),
])
.with_style(Style {
position_type: PositionType::Absolute,
position: UiRect {
bottom: Val::Px(5.0),
right: Val::Px(15.0),
..default()
},
..default()
}),
TextChanges,
));
commands.spawn(
TextBundle::from_section(
"This\ntext has\nline breaks and also a set width in the bottom left",
TextStyle {
font,
font_size: 50.0,
color: Color::WHITE,
},
)
.with_style(Style {
align_self: AlignSelf::FlexEnd,
position_type: PositionType::Absolute,
position: UiRect {
bottom: Val::Px(5.0),
left: Val::Px(15.0),
..default()
},
size: Size {
width: Val::Px(200.0),
..default()
},
..default()
}),
);
}
fn change_text_system(
time: Res<Time>,
diagnostics: Res<Diagnostics>,
mut query: Query<&mut Text, With<TextChanges>>,
) {
for mut text in &mut query {
let mut fps = 0.0;
if let Some(fps_diagnostic) = diagnostics.get(FrameTimeDiagnosticsPlugin::FPS) {
if let Some(fps_smoothed) = fps_diagnostic.smoothed() {
fps = fps_smoothed;
}
}
let mut frame_time = time.delta_seconds_f64();
if let Some(frame_time_diagnostic) = diagnostics.get(FrameTimeDiagnosticsPlugin::FRAME_TIME)
{
if let Some(frame_time_smoothed) = frame_time_diagnostic.smoothed() {
frame_time = frame_time_smoothed;
}
}
text.sections[0].value = format!(
"This text changes in the bottom right - {fps:.1} fps, {frame_time:.3} ms/frame",
);
text.sections[2].value = format!("{fps:.1}");
text.sections[4].value = format!("{frame_time:.3}");
}
}