bevy/examples/ui/text.rs

use bevy::prelude::*;

fn main() {
    App::build()
        .add_default_plugins()
        .add_startup_system(setup.system())
        .run();
}

fn setup(
    command_buffer: &mut CommandBuffer,
    asset_server: Res<AssetServer>,
    mut fonts: ResMut<Assets<Font>>,
    mut textures: ResMut<Assets<Texture>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    let font_handle = asset_server
        .load_sync(&mut fonts, "assets/fonts/FiraSans-Bold.ttf")
        .unwrap();
    let font = fonts.get(&font_handle).unwrap();

    let texture = font.render_text("Hello from Bevy!", Color::rgba(0.9, 0.9, 0.9, 1.0), 500, 60);
    let half_width = texture.width as f32 / 2.0;
    let half_height = texture.height as f32 / 2.0;
    let texture_handle = textures.add(texture);
    command_buffer
        .build()
        // 2d camera
        .add_entity(Camera2dEntity::default())
        // texture
        .add_entity(UiEntity {
            node: Node::new(
                math::vec2(0.0, 0.0),
                Anchors::CENTER,
                Margins::new(-half_width, half_width, -half_height, half_height),
            ),
            material: materials.add(ColorMaterial::texture(texture_handle)),
            ..Default::default()
        });
}