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scale_factor_override.rs
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scale_factor_override.rs
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//! This example illustrates how to override the window scale factor imposed by the
//! operating system.
use bevy::{prelude::*, window::WindowResolution};
fn main() {
App::new()
.add_plugins(DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
resolution: WindowResolution::new(500., 300.).with_scale_factor_override(1.0),
..default()
}),
..default()
}))
.add_systems(Startup, setup)
.add_systems(
Update,
(display_override, toggle_override, change_scale_factor),
)
.run();
}
fn setup(mut commands: Commands) {
// camera
commands.spawn(Camera2dBundle::default());
// root node
commands
.spawn(NodeBundle {
style: Style {
width: Val::Percent(100.0),
height: Val::Percent(100.0),
justify_content: JustifyContent::SpaceBetween,
..default()
},
..default()
})
.with_children(|parent| {
// left vertical fill (border)
parent
.spawn(NodeBundle {
style: Style {
width: Val::Px(200.0),
height: Val::Percent(100.0),
border: UiRect::all(Val::Px(2.0)),
..default()
},
background_color: Color::rgb(0.65, 0.65, 0.65).into(),
..default()
})
.with_children(|parent| {
parent.spawn(
TextBundle::from_section(
"Example text",
TextStyle {
font_size: 30.0,
..default()
},
)
.with_style(Style {
align_self: AlignSelf::FlexEnd,
..default()
}),
);
});
});
}
/// Set the title of the window to the current override
fn display_override(mut windows: Query<&mut Window>) {
let mut window = windows.single_mut();
window.title = format!(
"Scale override: {:?}",
window.resolution.scale_factor_override()
);
}
/// This system toggles scale factor overrides when enter is pressed
fn toggle_override(input: Res<ButtonInput<KeyCode>>, mut windows: Query<&mut Window>) {
let mut window = windows.single_mut();
if input.just_pressed(KeyCode::Enter) {
let scale_factor_override = window.resolution.scale_factor_override();
window
.resolution
.set_scale_factor_override(scale_factor_override.xor(Some(1.0)));
}
}
/// This system changes the scale factor override when up or down is pressed
fn change_scale_factor(input: Res<ButtonInput<KeyCode>>, mut windows: Query<&mut Window>) {
let mut window = windows.single_mut();
let scale_factor_override = window.resolution.scale_factor_override();
if input.just_pressed(KeyCode::ArrowUp) {
window
.resolution
.set_scale_factor_override(scale_factor_override.map(|n| n + 1.0));
} else if input.just_pressed(KeyCode::ArrowDown) {
window
.resolution
.set_scale_factor_override(scale_factor_override.map(|n| (n - 1.0).max(1.0)));
}
}