// 等待窗口加载完成
window.addEventListener('load', function() {
  const svgElement = document.getElementById('your-svg-element');
  const bbox = svgElement.getBBox();
  console.log(bbox);
});

function getBBoxSafe(element) {
  return new Promise(resolve => {
    requestAnimationFrame(() => {
      const bbox = element.getBBox();
      if (bbox.width === 0 || bbox.height === 0) {
        // 如果仍然为零，可以尝试强制重绘
        element.style.display = 'none';
        element.offsetHeight; // 触发重排
        element.style.display = '';
        requestAnimationFrame(() => {
          resolve(element.getBBox());
        });
      } else {
        resolve(bbox);
      }
    });
  });
}

// 使用示例
getBBoxSafe(document.getElementById('your-svg-element'))
  .then(bbox => console.log(bbox));

function isElementVisible(element) {
  return element.offsetWidth > 0 && 
         element.offsetHeight > 0 && 
         window.getComputedStyle(element).display !== 'none' &&
         window.getComputedStyle(element).visibility !== 'hidden';
}

function getBBoxIfVisible(element) {
  if (!isElementVisible(element)) {
    console.warn('Element is not visible');
    return null;
  }
  return element.getBBox();
}

function getSVGBBox(element) {
  // 尝试 getBBox() 首先
  try {
    const bbox = element.getBBox();
    if (bbox.width > 0 && bbox.height > 0) {
      return bbox;
    }
  } catch (e) {
    console.warn('getBBox failed:', e);
  }
  
  // 回退到 getBoundingClientRect()
  const rect = element.getBoundingClientRect();
  return {
    x: rect.left,
    y: rect.top,
    width: rect.width,
    height: rect.height
  };
}