如何在Bevy中任意移动摄像头

use bevy::prelude::*;

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

fn setup(commands: &mut Commands) {
    commands.spawn_bundle(OrthographicCameraBundle::new_2d());
}

use bevy::prelude::*;

fn main() {
    App::build()
        .add_plugins(DefaultPlugins)
        .add_startup_system(setup.system())
        .add_system(move_camera.system())
        .run();
}

fn setup(commands: &mut Commands) {
    commands.spawn_bundle(OrthographicCameraBundle::new_2d());
}

fn move_camera(
    windows: Res<Windows>,
    mut query: Query<&mut Transform, With<Camera>>,
    mouse_motion_events: Res<Events<MouseMotion>>,
) {
    for event in mouse_motion_events.iter() {
        let window = windows.get_primary().unwrap();
        let size = Vec2::new(window.width() as f32, window.height() as f32);
        let delta = event.delta / size;

        for mut transform in query.iter_mut() {
            transform.translation.x += delta.x;
            transform.translation.y -= delta.y;
        }
    }
}