Method inCenter

packages/shapes/src/Rectangle.ts:22–26

* 构造一个相对于屏幕来说内容居中的矩形 * 用于UI初始化窗口

(size: Vector)

   * 用于UI初始化窗口
   */
  public static inCenter(size: Vector): Rectangle {
    const screenCenter = new Vector(window.innerWidth, window.innerHeight).divide(2);
    const location = screenCenter.subtract(size.divide(2));
    return new Rectangle(location, size);
  }

  public get left(): number {
    return this.location.x;