bevy/examples/ui.rs

use bevy::{
    asset::{Asset, AssetStorage},
    math::{Mat4, Vec3},
    render::*,
    *,
};

fn main() {
    AppBuilder::new().add_defaults().setup(&setup).run();
}

fn setup(world: &mut World, scheduler: &mut SystemScheduler<AppStage>) {
    let cube = Mesh::load(MeshType::Cube);
    let cube_handle = {
        let mut mesh_storage = world
            .resources
            .get_mut::<AssetStorage<Mesh, MeshType>>()
            .unwrap();
        mesh_storage.add(cube, "cube")
    };

    let transform_system_bundle = transform_system_bundle::build(world);
    scheduler.add_systems(AppStage::Update, transform_system_bundle);

    world.insert(
        (),
        vec![(
            cube_handle,
            LocalToWorld::identity(),
            Material::new(math::vec4(0.5, 0.3, 0.3, 1.0)),
        )],
    );

    world.insert(
        (),
        vec![(
            Light {
                color: wgpu::Color {
                    r: 0.8,
                    g: 0.8,
                    b: 0.5,
                    a: 1.0,
                },
                fov: f32::to_radians(60.0),
                depth: 0.1..50.0,
                target_view: None,
            },
            LocalToWorld::identity(),
            Translation::new(4.0, -4.0, 5.0),
            Rotation::from_euler_angles(0.0, 0.0, 0.0),
        )],
    );

    world.insert(
        (),
        vec![
            // camera
            (
                Camera::new(CameraType::Projection {
                    fov: std::f32::consts::PI / 4.0,
                    near: 1.0,
                    far: 1000.0,
                    aspect_ratio: 1.0,
                }),
                ActiveCamera,
                LocalToWorld(Mat4::look_at_rh(
                    Vec3::new(3.0, -5.0, 3.0),
                    Vec3::new(0.0, 0.0, 0.0),
                    Vec3::new(0.0, 0.0, 1.0),
                )),
            ),
        ],
    );

    world.insert(
        (),
        vec![
            // camera
            (
                Camera::new(CameraType::Orthographic {
                    left: 0.0,
                    right: 0.0,
                    bottom: 0.0,
                    top: 0.0,
                    near: 0.0,
                    far: 1.0,
                }),
                ActiveCamera2d,
            ),
        ],
    );

    world.insert(
        (),
        vec![(Rect {
            position: math::vec2(75.0, 75.0),
            dimensions: math::vec2(100.0, 100.0),
            color: math::vec4(0.0, 1.0, 0.0, 1.0),
        },)],
    );

    world.insert(
        (),
        vec![(Rect {
            position: math::vec2(50.0, 50.0),
            dimensions: math::vec2(100.0, 100.0),
            color: math::vec4(1.0, 0.0, 0.0, 1.0),
        },)],
    );

    world.insert(
        (),
        vec![(Rect {
            position: math::vec2(100.0, 100.0),
            dimensions: math::vec2(100.0, 100.0),
            color: math::vec4(0.0, 0.0, 1.0, 1.0),
        },)],
    );
}