2d shapes for bevy 0.8 blog

shapes.rs

// License: Apache-2.0 / MIT

use bevy::{prelude::*, sprite::MaterialMesh2dBundle};

fn main() {
    App::new()
        .insert_resource(ClearColor(Color::rgba(0.2, 0.2, 0.2, 1.0)))
        .add_plugins(DefaultPlugins)
        .add_startup_system(setup)
        .run();
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    commands.spawn_bundle(Camera2dBundle::default());

    let radius = 120.;

    let shapes = [
        (
            meshes.add(shape::Circle::new(radius).into()).into(),
            materials.add(ColorMaterial::from(Color::hex("FF1A1A").unwrap())),
        ),
        (
            meshes
                .add(shape::RegularPolygon::new(radius, 5).into())
                .into(),
            materials.add(ColorMaterial::from(Color::hex("FF821A").unwrap())),
        ),
        (
            meshes
                .add(shape::RegularPolygon::new(radius, 6).into())
                .into(),
            materials.add(ColorMaterial::from(Color::hex("12B2B2").unwrap())),
        ),
        (
            meshes
                .add(shape::RegularPolygon::new(radius, 8).into())
                .into(),
            materials.add(ColorMaterial::from(Color::hex("16D816").unwrap())),
        ),
    ];

    let w = 1280. + 200.;
    let spacing: f32 = w / (shapes.len() + 1) as f32;

    for (i, (shape, color)) in shapes.into_iter().enumerate() {
        let x = (i + 1) as f32 * spacing - w / 2.;

        commands.spawn_bundle(MaterialMesh2dBundle {
            mesh: shape,
            material: color,
            transform: Transform::from_xyz(x, 0., 0.),
            ..default()
        });
    }
}