Question

我可以使用航路点perfectyl.but我不能得到最短的方向。我尝试使用路线选择，但它不起作用。我需要这样的事情：http://i58.tinypic.com/2vjbt6d.jpg

有什么办法吗？

我的代码

function codeAddress(adres) {
        var address = adres;  
        geocoder.geocode({ 'address': address }, function (results, status) {
            if (status == google.maps.GeocoderStatus.OK) {
                map.setCenter(results[0].geometry.location);
            }
        });

    }

    function calcRoute() {
        var grid = document.getElementById('GridView1');
        var start = document.getElementById('DropDownList_ilce').value + "," + document.getElementById('DropDownList_il').value;
        var end = document.getElementById('GridView1').rows[grid.rows.length - 1].cells[4].innerHTML + "," + document.getElementById('GridView1').rows[grid.rows.length - 1].cells[3].innerHTML;

        var waypts = [];
        for (var i = 0; i < grid.rows.length - 2; i++) {
            waypts.push({
                location: document.getElementById('GridView1').rows[i+1].cells[4].innerHTML + "," + document.getElementById('GridView1').rows[i+1].cells[3].innerHTML,
                stopover: true
            });
        }


        var request = {
            origin: start,
            destination: end,
            waypoints: waypts,
            optimizeWaypoints: true,
            travelMode: google.maps.TravelMode.DRIVING
        };
        directionsService.route(request, function (response, status) {
            if (status == google.maps.DirectionsStatus.OK) {
                directionsDisplay.setDirections(response);
            }
        });

Answer 1

正如我在评论中所说，API似乎没有提供选项参数来默认返回最短路径。

此处的关键是使用provideRouteAlternatives: true作为DirectionsRequest属性：

var request = {
    origin: 'cerkeş,çankırı',
    destination: 'diyarbakır',
    travelMode: google.maps.DirectionsTravelMode.DRIVING,
    provideRouteAlternatives: true
};

对于给定的起点和终点，这将返回2个单独的路线。其中一个970公里，一个1137公里。

然后你必须计算哪条路线最短。你可以这样做：

directionsService.route(request, function (response, status) {

    if (status == google.maps.DirectionsStatus.OK) {

        var distance = null;
        var routeIndex = 0;

        // Loop through the routes to find the shortest one
        for (var i=0; i<response['routes'].length; i++) {

            var routeDistance = response['routes'][i].legs[0].distance.value;

            if (distance === null) {

                distance = routeDistance;
                routeIndex = i;
            }

            if (routeDistance < distance) {

                distance = routeDistance;
                routeIndex = i;
            }
        }

        directionsDisplay.setDirections(response);

        // Set route index
        directionsDisplay.setOptions({ 
            routeIndex: routeIndex
        });
    }
});

请注意，当您有多条路线时，关键是设置您想要显示的路线索引。

// Set route index
directionsDisplay.setOptions({
    routeIndex: routeIndex
});

此示例不使用航点。我相信如果你使用航点，你最终会有多条DirectionsLeg腿。在这种情况下，您将需要进行更多计算以添加每个腿距以查找总路线距离。

希望这有帮助！

使用航点时的最短路线

1 个答案: