通过垂直子午线的两点

Question

我们在Polyline上绘制标记时遇到问题，该标记穿过垂直子午线（我选择了红线）。

图片供您参考

当标记没有超过此行时，一切正常。

代码：

<div id="map" style="height:100%;"></div>
<script async defer
    src="https://maps.googleapis.com/maps/api/js?callback=initialize&libraries=geometry">
</script>

function initialize() {

var path = [
    {"lat":8.35750896119,"lng":-83.91185135579997},
    {"lat":49.93177613,"lng":155.39886474599996},
    {"lat":35.93177613,"lng":130.39886474599996}
];
    var offset = 1;

var mapOptions = {
        zoom: 6,
    mapTypeId: 'terrain'
};

var map = new google.maps.Map(document.getElementById('map'), mapOptions);

var line = new google.maps.Polyline({
    path: path,
  map: map
});

var position = getLatLngForDistanceOnPolyline(line, offset);

var marker = new google.maps.Marker({
    map: map
});
map.setCenter(position);

 var interval = window.setInterval(function() {
    var newPosition = getLatLngForDistanceOnPolyline(line, offset);
    marker.setPosition(newPosition);
    offset++;
    if(offset > 100) offset = 1;
 }, 50);}
function getLatLngForDistanceOnPolyline(polyline, offset){
var dist = 0;
var distance = google.maps.geometry.spherical.computeLength(polyline.getPath(), 0);
var offsetDistance = distance * offset / 100.00;

var points = polyline.getPath().getArray();

if(points.length > 0) {
    for(var i = 0; i < points.length - 1; i++){
        var pointStart  = new google.maps.LatLng(points[i].lat(), points[i].lng());
        var pointEnd    = new google.maps.LatLng(points[i + 1].lat(), points[i + 1].lng());
        var curDistance = google.maps.geometry.spherical.computeDistanceBetween(pointStart, pointEnd);
        var prevDist = dist;
        dist += curDistance;

        if(offsetDistance <= dist) {
            var diff = offsetDistance - prevDist;
            diff = diff / curDistance;
            var d = diff / (1.0 - diff);

            return new google.maps.LatLng(
                ( points[i].lat() + ( d * points[i + 1].lat() ) ) / (1.0 + d),
                ( points[i].lng() + ( d * points[i + 1].lng() ) ) / (1.0 + d)
            )
        }
    }
}
}

如果对此错误有任何意见或帮助，请回复我。