Google Maps API折线动画的线长速度

var polyline = new google.maps.Polyline({
  path: [/* 折线的路径 */],
  strokeColor: /* 折线的颜色 */,
  strokeOpacity: /* 折线的透明度 */,
  strokeWeight: /* 折线的宽度 */
});

var lineLength = google.maps.geometry.spherical.computeLength(polyline.getPath());
var animationDuration = /* 动画的持续时间 */;
var animationSpeed = lineLength / animationDuration; // 计算线长速度

var animateOptions = {
  path: polyline.getPath(),
  duration: animationDuration,
  easing: /* 动画的缓动函数 */,
  step: function(currentStep) {
    // 根据当前步数和线长速度计算折线的长度
    var currentLength = currentStep * animationSpeed;

    // 更新折线的路径
    var newPath = google.maps.geometry.spherical.computeOffset(polyline.getPath().getAt(0), currentLength, /* 折线的方向 */);
    polyline.setPath(newPath);
  }
};

// 启动折线动画
new google.maps.Animation.Polyline(polyline, animateOptions);