感谢您在这个论坛的帮助，我几乎完成了我在寻找一个起点，许多标记之间的最短路线分配。然而，我的距离measurment简直是采用半正矢公式，但它没有显示两点之间的真实路由距离。我想结合这已经在谷歌地图合作，以获得使用DirectionServices两点之间最短的距离以前发达的功能。从下面的主页，我发现计算每个路径的距离的方法。 http://ratan.com.np/calculate-distance-location-longitude-latitude-google-maps-v3-route/
我已经反复检查我的代码，但我仍然不知道为什么代码失败......它返回一个语法错误“意外的标记<” ....
谁能帮我拿的代码一看...看到任何概念的错误在我修改后的方案....非常非常感谢...
点击一个按钮来调用“Submit2（）函数
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var map;
var origin = null;
var destination = null;
var markersArray = [];
var start_lat = null;
var start_long = null;
var end_lat = null;
var end_long = null;
var station_num = null;
var trig_name = null;
var total_dist;
var closest_dist;
var closest_marker;
var Submit2=function() {
var URL2="Search_nearest_trig_advanced.php"; //Call another PHP to load all markers in JSON format
$.ajax({
url: URL2,
type: "POST",
dataType: "json",
success: function(data){
$.each(data, function(i, item) {
start_lat = item.start_lat; //Return the Lat, Lng of the Starting point from Textbox
start_long = item.start_long;
station_num = item.station_num;
trig_name = item.trig_name;
end_lat = item.end_lat;
end_long = item.end_long;
origin = new google.maps.LatLng(start_lat, start_long); //Origin and Destination parameters are used for Google Direction Services
destination = new google.maps.LatLng(end_lat, end_long);
marker = new google.maps.Marker({
map: map,
position: destination,
icon: trigicon,
title: trig_name
})
markersArray.push(marker);
calcRoute2(); //find the total distance 'total_dist' for each route
if (total_dist > closest_dist) { //Replace the closest_marker by the one with shorter distance
closest_dist = total;
closest_marker.setMap(null);
closest_marker = marker;
}
});
},
error:function(xhr, ajaxOptions, thrownError){
alert(xhr.status);
alert(thrownError);
}
});
destination = closest_marker.getPosition();
calcRoute(); //the original method to show the route
};
调用calcRoute（）函数来计算线路距离
function calcRoute2() {
document.getElementById("directions_panel").innerHTML = "";
directionsDisplay = new google.maps.DirectionsRenderer({
'map': map,
'preserveViewport': false, //Google Map will change the zoom extent to match with the Direction route if set false
'draggable': true
});
var request = {
origin: origin,
destination: destination,
waypoints: waypoints,
travelMode: google.maps.DirectionsTravelMode.DRIVING,
optimizeWaypoints: document.getElementById('optimize').checked,
avoidHighways: document.getElementById('highways').checked,
avoidTolls: document.getElementById('tolls').checked
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
computeTotalDistance(response);
}
});
directionsVisible = false;
}
function computeTotalDistance(result) {
var total_dist = 0;
var myroute = result.routes[0];
for (i = 0; i < myroute.legs.length; i++) {
total_dist += myroute.legs[i].distance.value;
}
total_dist = total_dist / 1000 // the distance output is converted to KiloMeter
}
该“search_nearest_trig_advanced.php”
<?php
require_once "dbconnect.php";
require_once "hk1980.php";
$coor_x = $_POST['hk80_x'];
$coor_y = $_POST['hk80_y'];
/* Connect to the MySQL database. */
if (!($connection = @ mysql_connect($remotehost, $username, $password)))
die("Connection failed");
if (!(mysql_select_db($database, $connection)))
die("Couldn't select testing database");
// Run the query on the connection
$sql_query = "Select station_num, trig_name, X(trig_xy_pos) as X_Coor, Y(trig_xy_pos) as Y_Coor From trig_station";
if (!($sql_result = @ mysql_query($sql_query, $connection)))
die("Couldn't run query");
while ($row = @ mysql_fetch_array($sql_result, MYSQL_ASSOC))
{
$start_east = floatval($coor_x);
$start_north = floatval($coor_y);
$hk1980_start = array($start_east, $start_north);
$end_east = floatval($row['X_Coor']);
$end_north = floatval($row['Y_Coor']);
$hk1980_end = array($end_east,$end_north);
$wgs84_start = hk1980_to_wgs84($hk1980_start[1],$hk1980_start[0],2);
$wgs84_end = hk1980_to_wgs84($hk1980_end[1],$hk1980_end[0],2);
$row_set[] = array("start_lat" => $wgs84_start[0], "start_long" => $wgs84_start[1], "station_num" => $row['station_num'],"trig_name" => $row['trig_name'],"end_lat" => $wgs84_end[0],"end_long" => $wgs84_end[1]);
}
echo json_encode($row_set);
?>
该DistanceMatrix不会返回路线转由转动方向。你必须使用DirectionsService了点。所以，你想要做的是首先通过你的起点和目的地矩阵，并找到最短的路线。你发现后的最短路线传递路线导航服务，以获得转由转信息。
如果通过多条路径需要周期，你可能必须使用一个优质的服务。谷歌限制了它的服务，以防止滥用自由进入。
Here is a working example of the concept
相关的代码：
function calculateDistances() {
var service = new google.maps.DistanceMatrixService();
service.getDistanceMatrix({
origins: [origin], //array of origins
destinations: destinations, //array of destinations
travelMode: google.maps.TravelMode.DRIVING,
unitSystem: google.maps.UnitSystem.METRIC,
avoidHighways: false,
avoidTolls: false
}, callback);
}
function callback(response, status) {
if (status != google.maps.DistanceMatrixStatus.OK) {
alert('Error was: ' + status);
} else {
//we only have one origin so there should only be one row
var routes = response.rows[0];
//need to find the shortest
var lowest = Number.POSITIVE_INFINITY;
var tmp;
var shortestRouteIdx;
var resultText = "Possible Routes: <br/>";
for (var i = routes.elements.length - 1; i >= 0; i--) {
tmp = routes.elements[i].duration.value;
resultText += "Route " + destinations[i] + ": " + tmp + "<br/>";
if (tmp < lowest) {
lowest = tmp;
shortestRouteIdx = i;
}
}
//log the routes and duration.
$('#results').html(resultText);
//get the shortest route
var shortestRoute = destinations[shortestRouteIdx];
//now we need to map the route.
calculateRoute(origin, shortestRoute)
}
}
//Calculate the route of the shortest distance we found.
function calculateRoute(start, end) {
var request = {
origin: start,
destination: end,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request, function (result, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(result);
}
});
}
如果你试图去多个位置行进距离和不需要的路线，使用DistanceMatrix