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box_shadow.rs
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box_shadow.rs
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//! This example shows how to create a node with a shadow
use argh::FromArgs;
use bevy::color::palettes::css::BLUE;
use bevy::color::palettes::css::DEEP_SKY_BLUE;
use bevy::color::palettes::css::GREEN;
use bevy::color::palettes::css::LIGHT_SKY_BLUE;
use bevy::color::palettes::css::RED;
use bevy::color::palettes::css::YELLOW;
use bevy::prelude::*;
use bevy::winit::WinitSettings;
#[derive(FromArgs, Resource)]
/// `box_shadow` example
struct Args {
/// number of samples
#[argh(option, default = "4")]
samples: u32,
}
fn main() {
App::new()
.add_plugins(DefaultPlugins)
// Only run the app when there is user input. This will significantly reduce CPU/GPU use.
.insert_resource(WinitSettings::desktop_app())
.add_systems(Startup, setup)
.run();
}
fn setup(mut commands: Commands) {
// `from_env` panics on the web
#[cfg(not(target_arch = "wasm32"))]
let args: Args = argh::from_env();
#[cfg(target_arch = "wasm32")]
let args = Args::from_args(&[], &[]).unwrap();
// ui camera
commands.spawn((Camera2d, UiBoxShadowSamples(args.samples)));
commands
.spawn((
Node {
width: Val::Percent(100.0),
height: Val::Percent(100.0),
padding: UiRect::all(Val::Px(30.)),
column_gap: Val::Px(30.),
flex_wrap: FlexWrap::Wrap,
..default()
},
BackgroundColor(DEEP_SKY_BLUE.into()),
))
.with_children(|commands| {
let example_nodes = [
(
Vec2::splat(50.),
Vec2::ZERO,
10.,
0.,
BorderRadius::bottom_right(Val::Px(10.)),
),
(Vec2::new(50., 25.), Vec2::ZERO, 10., 0., BorderRadius::ZERO),
(Vec2::splat(50.), Vec2::ZERO, 10., 0., BorderRadius::MAX),
(Vec2::new(100., 25.), Vec2::ZERO, 10., 0., BorderRadius::MAX),
(
Vec2::splat(50.),
Vec2::ZERO,
10.,
0.,
BorderRadius::bottom_right(Val::Px(10.)),
),
(Vec2::new(50., 25.), Vec2::ZERO, 0., 10., BorderRadius::ZERO),
(
Vec2::splat(50.),
Vec2::ZERO,
0.,
10.,
BorderRadius::bottom_right(Val::Px(10.)),
),
(Vec2::new(100., 25.), Vec2::ZERO, 0., 10., BorderRadius::MAX),
(
Vec2::splat(50.),
Vec2::splat(25.),
0.,
0.,
BorderRadius::ZERO,
),
(
Vec2::new(50., 25.),
Vec2::splat(25.),
0.,
0.,
BorderRadius::ZERO,
),
(
Vec2::splat(50.),
Vec2::splat(10.),
0.,
0.,
BorderRadius::bottom_right(Val::Px(10.)),
),
(
Vec2::splat(50.),
Vec2::splat(25.),
0.,
10.,
BorderRadius::ZERO,
),
(
Vec2::new(50., 25.),
Vec2::splat(25.),
0.,
10.,
BorderRadius::ZERO,
),
(
Vec2::splat(50.),
Vec2::splat(10.),
0.,
10.,
BorderRadius::bottom_right(Val::Px(10.)),
),
(
Vec2::splat(50.),
Vec2::splat(10.),
0.,
3.,
BorderRadius::ZERO,
),
(
Vec2::new(50., 25.),
Vec2::splat(10.),
0.,
3.,
BorderRadius::ZERO,
),
(
Vec2::splat(50.),
Vec2::splat(10.),
0.,
3.,
BorderRadius::bottom_right(Val::Px(10.)),
),
(
Vec2::splat(50.),
Vec2::splat(10.),
0.,
3.,
BorderRadius::all(Val::Px(20.)),
),
(
Vec2::new(50., 25.),
Vec2::splat(10.),
0.,
3.,
BorderRadius::all(Val::Px(20.)),
),
(
Vec2::new(25., 50.),
Vec2::splat(10.),
0.,
3.,
BorderRadius::MAX,
),
(
Vec2::splat(50.),
Vec2::splat(10.),
0.,
10.,
BorderRadius::all(Val::Px(20.)),
),
(
Vec2::new(50., 25.),
Vec2::splat(10.),
0.,
10.,
BorderRadius::all(Val::Px(20.)),
),
(
Vec2::new(25., 50.),
Vec2::splat(10.),
0.,
10.,
BorderRadius::MAX,
),
];
for (size, offset, spread, blur, border_radius) in example_nodes {
commands.spawn(box_shadow_node_bundle(
size,
offset,
spread,
blur,
border_radius,
));
}
// Demonstrate multiple shadows on one node
commands.spawn((
Node {
width: Val::Px(40.),
height: Val::Px(40.),
border: UiRect::all(Val::Px(4.)),
..default()
},
BorderColor(LIGHT_SKY_BLUE.into()),
BorderRadius::all(Val::Px(20.)),
BackgroundColor(DEEP_SKY_BLUE.into()),
BoxShadow(vec![
ShadowStyle {
color: RED.with_alpha(0.7).into(),
x_offset: Val::Px(-20.),
y_offset: Val::Px(-5.),
spread_radius: Val::Percent(10.),
blur_radius: Val::Px(3.),
},
ShadowStyle {
color: BLUE.with_alpha(0.7).into(),
x_offset: Val::Px(-5.),
y_offset: Val::Px(-20.),
spread_radius: Val::Percent(10.),
blur_radius: Val::Px(3.),
},
ShadowStyle {
color: YELLOW.with_alpha(0.7).into(),
x_offset: Val::Px(20.),
y_offset: Val::Px(5.),
spread_radius: Val::Percent(10.),
blur_radius: Val::Px(3.),
},
ShadowStyle {
color: GREEN.with_alpha(0.7).into(),
x_offset: Val::Px(5.),
y_offset: Val::Px(20.),
spread_radius: Val::Percent(10.),
blur_radius: Val::Px(3.),
},
]),
));
});
}
fn box_shadow_node_bundle(
size: Vec2,
offset: Vec2,
spread: f32,
blur: f32,
border_radius: BorderRadius,
) -> impl Bundle {
(
Node {
width: Val::Px(size.x),
height: Val::Px(size.y),
border: UiRect::all(Val::Px(4.)),
..default()
},
BorderColor(LIGHT_SKY_BLUE.into()),
border_radius,
BackgroundColor(DEEP_SKY_BLUE.into()),
BoxShadow::new(
Color::BLACK.with_alpha(0.8),
Val::Percent(offset.x),
Val::Percent(offset.y),
Val::Percent(spread),
Val::Px(blur),
),
)
}