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text_debug.rs:
//! Shows various text layout options.
use bevy::{
color::palettes::css::*,
diagnostic::{DiagnosticsStore, FrameTimeDiagnosticsPlugin},
prelude::*,
window::PresentMode,
};
fn main() {
App::new()
.add_plugins((
DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
present_mode: PresentMode::AutoNoVsync,
..default()
}),
..default()
}),
FrameTimeDiagnosticsPlugin,
))
.add_systems(Startup, infotext_system)
.add_systems(Update, 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());
let root_uinode = commands
.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.),
height: Val::Percent(100.),
justify_content: JustifyContent::SpaceBetween,
..default()
},
..default()
})
.id();
let left_column = commands.spawn(NodeBundle {
style: Style {
flex_direction: FlexDirection::Column,
justify_content: JustifyContent::SpaceBetween,
align_items: AlignItems::Start,
flex_grow: 1.,
margin: UiRect::axes(Val::Px(15.), Val::Px(5.)),
..default()
},
..default()
}).with_children(|builder| {
builder.spawn(
TextBundle::from_section(
"This is\ntext with\nline breaks\nin the top left.",
TextStyle {
font: font.clone(),
font_size: 30.0,
..default()
},
)
);
builder.spawn(TextBundle::from_section(
"This text is right-justified. The `JustifyText` component controls the horizontal alignment of the lines of multi-line text relative to each other, and does not affect the text node's position in the UI layout.", TextStyle {
font: font.clone(),
font_size: 30.0,
color: YELLOW.into(),
},
)
.with_text_justify(JustifyText::Right)
.with_style(Style {
max_width: Val::Px(300.),
..default()
})
);
builder.spawn(
TextBundle::from_section(
"This\ntext has\nline breaks and also a set width in the bottom left.",
TextStyle {
font: font.clone(),
font_size: 30.0,
..default()
},
)
.with_style(Style {
max_width: Val::Px(300.),
..default()
})
);
}).id();
let right_column = commands.spawn(NodeBundle {
style: Style {
flex_direction: FlexDirection::Column,
justify_content: JustifyContent::SpaceBetween,
align_items: AlignItems::End,
flex_grow: 1.,
margin: UiRect::axes(Val::Px(15.), Val::Px(5.)),
..default()
},
..default()
}).with_children(|builder| {
builder.spawn(TextBundle::from_section(
"This text is very long, has a limited width, is center-justified, is positioned in the top right and is also colored pink.",
TextStyle {
font: font.clone(),
font_size: 40.0,
color: Color::srgb(0.8, 0.2, 0.7),
},
)
.with_text_justify(JustifyText::Center)
.with_style(Style {
max_width: Val::Px(400.),
..default()
})
);
builder.spawn(
TextBundle::from_section(
"This text is left-justified and is vertically positioned to distribute the empty space equally above and below it.",
TextStyle {
font: font.clone(),
font_size: 35.0,
color: YELLOW.into(),
},
)
.with_text_justify(JustifyText::Left)
.with_style(Style {
max_width: Val::Px(300.),
..default()
}),
);
builder.spawn((
TextBundle::from_sections([
TextSection::new(
"This text changes in the bottom right",
TextStyle {
font: font.clone(),
font_size: 25.0,
..default()
},
),
TextSection::new(
"\nThis text changes in the bottom right - ",
TextStyle {
font: font.clone(),
font_size: 25.0,
color: RED.into(),
},
),
TextSection::from_style(TextStyle {
font: font.clone(),
font_size: 25.0,
color: ORANGE_RED.into(),
}),
TextSection::new(
" fps, ",
TextStyle {
font: font.clone(),
font_size: 25.0,
color: YELLOW.into(),
},
),
TextSection::from_style(TextStyle {
font: font.clone(),
font_size: 25.0,
color: LIME.into(),
}),
TextSection::new(
" ms/frame",
TextStyle {
font: font.clone(),
font_size: 25.0,
color: BLUE.into(),
},
),
]),
TextChanges,
));
})
.id();
commands
.entity(root_uinode)
.push_children(&[left_column, right_column]);
}
fn change_text_system(
time: Res<Time>,
diagnostics: Res<DiagnosticsStore>,
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}");
}
}