Support Warning
WebGPU is currently only supported on Chrome starting with version 113, and only on desktop. If they don't work on your configuration, you can check the WebGL2 examples here.
viewport_debug.rs:
//! A simple example for debugging viewport coordinates
//!
//! This example creates two uinode trees, one using viewport coordinates and one using pixel coordinates,
//! and then switches between them once per second using the `Display` style property.
//! If there are no problems both layouts should be identical, except for the color of the margin changing which is used to signal that the displayed uinode tree has changed
//! (red for viewport, yellow for pixel).
use bevy::{color::palettes::css::*, prelude::*};
const PALETTE: [Srgba; 10] = [
RED, YELLOW, WHITE, BEIGE, AQUA, CRIMSON, NAVY, AZURE, LIME, BLACK,
];
#[derive(Component, Default, PartialEq)]
enum Coords {
#[default]
Viewport,
Pixel,
}
fn main() {
App::new()
.insert_resource(UiScale(2.0))
.add_plugins(DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
title: "Viewport Coordinates Debug".to_string(),
// This example relies on these specific viewport dimensions, so let's explicitly
// define them.
resolution: [1280., 720.].into(),
resizable: false,
..Default::default()
}),
..Default::default()
}))
.add_systems(Startup, setup)
.add_systems(Update, update)
.run();
}
fn update(
mut timer: Local<f32>,
mut visible_tree: Local<Coords>,
time: Res<Time>,
mut coords_style_query: Query<(&Coords, &mut Style)>,
) {
*timer -= time.delta_seconds();
if *timer <= 0. {
*timer = 1.;
*visible_tree = match *visible_tree {
Coords::Viewport => Coords::Pixel,
Coords::Pixel => Coords::Viewport,
};
for (coords, mut style) in coords_style_query.iter_mut() {
style.display = if *coords == *visible_tree {
Display::Flex
} else {
Display::None
};
}
}
}
fn setup(mut commands: Commands) {
commands.spawn(Camera2dBundle::default());
spawn_with_viewport_coords(&mut commands);
spawn_with_pixel_coords(&mut commands);
}
fn spawn_with_viewport_coords(commands: &mut Commands) {
commands
.spawn((
NodeBundle {
style: Style {
width: Val::Vw(100.),
height: Val::Vh(100.),
border: UiRect::axes(Val::Vw(5.), Val::Vh(5.)),
flex_wrap: FlexWrap::Wrap,
..default()
},
border_color: PALETTE[0].into(),
..default()
},
Coords::Viewport,
))
.with_children(|builder| {
builder.spawn(NodeBundle {
style: Style {
width: Val::Vw(30.),
height: Val::Vh(30.),
border: UiRect::all(Val::VMin(5.)),
..default()
},
background_color: PALETTE[2].into(),
border_color: PALETTE[9].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Vw(60.),
height: Val::Vh(30.),
..default()
},
background_color: PALETTE[3].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Vw(45.),
height: Val::Vh(30.),
border: UiRect::left(Val::VMax(45. / 2.)),
..default()
},
background_color: PALETTE[4].into(),
border_color: PALETTE[8].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Vw(45.),
height: Val::Vh(30.),
border: UiRect::right(Val::VMax(45. / 2.)),
..default()
},
background_color: PALETTE[5].into(),
border_color: PALETTE[8].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Vw(60.),
height: Val::Vh(30.),
..default()
},
background_color: PALETTE[6].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Vw(30.),
height: Val::Vh(30.),
border: UiRect::all(Val::VMin(5.)),
..default()
},
background_color: PALETTE[7].into(),
border_color: PALETTE[9].into(),
..default()
});
});
}
fn spawn_with_pixel_coords(commands: &mut Commands) {
commands
.spawn((
NodeBundle {
style: Style {
width: Val::Px(640.),
height: Val::Px(360.),
border: UiRect::axes(Val::Px(32.), Val::Px(18.)),
flex_wrap: FlexWrap::Wrap,
..default()
},
border_color: PALETTE[1].into(),
..default()
},
Coords::Pixel,
))
.with_children(|builder| {
builder.spawn(NodeBundle {
style: Style {
width: Val::Px(192.),
height: Val::Px(108.),
border: UiRect::axes(Val::Px(18.), Val::Px(18.)),
..default()
},
background_color: PALETTE[2].into(),
border_color: PALETTE[9].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Px(384.),
height: Val::Px(108.),
..default()
},
background_color: PALETTE[3].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Px(288.),
height: Val::Px(108.),
border: UiRect::left(Val::Px(144.)),
..default()
},
background_color: PALETTE[4].into(),
border_color: PALETTE[8].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Px(288.),
height: Val::Px(108.),
border: UiRect::right(Val::Px(144.)),
..default()
},
background_color: PALETTE[5].into(),
border_color: PALETTE[8].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Px(384.),
height: Val::Px(108.),
..default()
},
background_color: PALETTE[6].into(),
..default()
});
builder.spawn(NodeBundle {
style: Style {
width: Val::Px(192.),
height: Val::Px(108.),
border: UiRect::axes(Val::Px(18.), Val::Px(18.)),
..default()
},
background_color: PALETTE[7].into(),
border_color: PALETTE[9].into(),
..default()
});
});
}