examples-zh

Latest commit 07ed1d0

use bevy::prelude::*;

/// 生成2D文本
fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_startup_system(初始设置)
        .add_system(动画_平移)
        .add_system(动画_旋转)
        .add_system(动画_缩放)
        .run();
}

#[derive(Component)]
struct AnimateTranslation;
#[derive(Component)]
struct AnimateRotation;
#[derive(Component)]
struct AnimateScale;

fn 初始设置(mut commands: Commands, asset_server: Res<AssetServer>) {
    let font = asset_server.load("fonts/LXGWWenKai.ttf");
    let text_style = TextStyle {
        font,
        font_size: 60.0,
        color: Color::WHITE,
    };
    let text_alignment = TextAlignment {
        vertical: VerticalAlign::Center,
        horizontal: HorizontalAlign::Center,
    };
    // 2D摄像机
    commands.spawn_bundle(OrthographicCameraBundle::new_2d());
    commands
        .spawn_bundle(Text2dBundle {
            text: Text::with_section("平移", text_style.clone(), text_alignment),
            ..Default::default()
        })
        // 用 AnimateTranslation 组件来标记这段 Text
        .insert(AnimateTranslation);
    commands
        .spawn_bundle(Text2dBundle {
            text: Text::with_section("旋转", text_style.clone(), text_alignment),
            ..Default::default()
        })
        // 用 AnimateRotation 组件来标记这段 Text
        .insert(AnimateRotation);
    commands
        .spawn_bundle(Text2dBundle {
            text: Text::with_section("缩放", text_style.clone(), text_alignment),
            ..Default::default()
        })
        // 用 AnimateScale 组件来标记这段 Text
        .insert(AnimateScale);
}

fn 动画_平移(
    mut query: Query<&mut Transform, (With<Text>, With<AnimateTranslation>)>,
    time: Res<Time>,
) {
    for mut transform in query.iter_mut() {
        transform.translation.x = 100.0 * time.seconds_since_startup().sin() as f32 - 400.0;
        transform.translation.y = 100.0 * time.seconds_since_startup().cos() as f32;
    }
}

fn 动画_旋转(
    mut query: Query<&mut Transform, (With<Text>, With<AnimateRotation>)>,
    time: Res<Time>,
) {
    for mut transform in query.iter_mut() {
        transform.rotation = Quat::from_rotation_z(time.seconds_since_startup().cos() as f32);
    }
}

fn 动画_缩放(
    mut query: Query<&mut Transform, (With<Text>, With<AnimateScale>)>,
    time: Res<Time>,
) {
    for mut transform in query.iter_mut() {
        transform.translation = Vec3::new(400.0, 0.0, 0.0);
        transform.scale = Vec3::splat((time.seconds_since_startup().sin() as f32 + 1.1) * 2.0);
    }
}