2d_shapes.rs

//! Shows how to render simple primitive shapes with a single color.
//!
//! You can toggle wireframes with the space bar except on wasm. Wasm does not support
//! `POLYGON_MODE_LINE` on the gpu.

#[cfg(not(target_arch = "wasm32"))]
use bevy::sprite::{Wireframe2dConfig, Wireframe2dPlugin};
use bevy::{
    prelude::*,
    sprite::{MaterialMesh2dBundle, Mesh2dHandle},
};

fn main() {
    let mut app = App::new();
    app.add_plugins((
        DefaultPlugins,
        #[cfg(not(target_arch = "wasm32"))]
        Wireframe2dPlugin,
    ))
    .add_systems(Startup, setup);
    #[cfg(not(target_arch = "wasm32"))]
    app.add_systems(Update, toggle_wireframe);
    app.run();
}

const X_EXTENT: f32 = 900.;

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::new(50.0))),
        Mesh2dHandle(meshes.add(CircularSector::new(50.0, 1.0))),
        Mesh2dHandle(meshes.add(CircularSegment::new(50.0, 1.25))),
        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(Rhombus::new(75.0, 100.0))),
        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()
        });
    }

    #[cfg(not(target_arch = "wasm32"))]
    commands.spawn(
        TextBundle::from_section("Press space to toggle wireframes", TextStyle::default())
            .with_style(Style {
                position_type: PositionType::Absolute,
                top: Val::Px(12.0),
                left: Val::Px(12.0),
                ..default()
            }),
    );
}

#[cfg(not(target_arch = "wasm32"))]
fn toggle_wireframe(
    mut wireframe_config: ResMut<Wireframe2dConfig>,
    keyboard: Res<ButtonInput<KeyCode>>,
) {
    if keyboard.just_pressed(KeyCode::Space) {
        wireframe_config.global = !wireframe_config.global;
    }
}