Function extendRect

packages/common/utils/math.ts:18–24

(box1: Rect, box2: Rect)

 * extendARect
 */
export function extendRect(box1: Rect, box2: Rect): Rect {
  const x = Math.min(box1.x, box2.x);
  const y = Math.min(box1.y, box2.y);
  const width = Math.max(box1.x + box1.width, box2.x + box2.width) - x;
  const height = Math.max(box1.y + box1.height, box2.y + box2.height) - y;
  return { x, y, width, height };
}

/**
 * 判断一个 Rect 是否包含另外一个 Rect