fae2200b1a
# Objective - There is a little mistake in a line comment. ## Solution - Fixed the comment to correctly describe what happens in the documented calculation.
56 lines
1.6 KiB
Rust
56 lines
1.6 KiB
Rust
//! Shows how to render simple primitive shapes with a single color.
|
|
|
|
use bevy::{
|
|
prelude::*,
|
|
sprite::{MaterialMesh2dBundle, Mesh2dHandle},
|
|
};
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup)
|
|
.run();
|
|
}
|
|
|
|
const X_EXTENT: f32 = 600.;
|
|
|
|
fn setup(
|
|
mut commands: Commands,
|
|
mut meshes: ResMut<Assets<Mesh>>,
|
|
mut materials: ResMut<Assets<ColorMaterial>>,
|
|
) {
|
|
commands.spawn(Camera2dBundle::default());
|
|
|
|
let shapes = [
|
|
Mesh2dHandle(meshes.add(Circle { radius: 50.0 })),
|
|
Mesh2dHandle(meshes.add(Ellipse::new(25.0, 50.0))),
|
|
Mesh2dHandle(meshes.add(Annulus::new(25.0, 50.0))),
|
|
Mesh2dHandle(meshes.add(Capsule2d::new(25.0, 50.0))),
|
|
Mesh2dHandle(meshes.add(Rectangle::new(50.0, 100.0))),
|
|
Mesh2dHandle(meshes.add(RegularPolygon::new(50.0, 6))),
|
|
Mesh2dHandle(meshes.add(Triangle2d::new(
|
|
Vec2::Y * 50.0,
|
|
Vec2::new(-50.0, -50.0),
|
|
Vec2::new(50.0, -50.0),
|
|
))),
|
|
];
|
|
let num_shapes = shapes.len();
|
|
|
|
for (i, shape) in shapes.into_iter().enumerate() {
|
|
// Distribute colors evenly across the rainbow.
|
|
let color = Color::hsl(360. * i as f32 / num_shapes as f32, 0.95, 0.7);
|
|
|
|
commands.spawn(MaterialMesh2dBundle {
|
|
mesh: shape,
|
|
material: materials.add(color),
|
|
transform: Transform::from_xyz(
|
|
// Distribute shapes from -X_EXTENT/2 to +X_EXTENT/2.
|
|
-X_EXTENT / 2. + i as f32 / (num_shapes - 1) as f32 * X_EXTENT,
|
|
0.0,
|
|
0.0,
|
|
),
|
|
..default()
|
|
});
|
|
}
|
|
}
|