使用Google Maps API v3的路线服务(directions service)。它基本上与路线API相同,但是很好地打包在Google Maps API中,还提供了方便的方式来轻松地在地图上渲染路线。
有关在地图上呈现方向路线的信息和示例可以在Google Maps API v3文档的呈现方向部分找到。
我创建了一个工作演示,展示了如何通过JavaScript使用Google Maps API Directions Service:
DirectionsService
对象用于发送和接收方向请求DirectionsRenderer
对象用于在地图上渲染返回的路线function initMap() {
var pointA = new google.maps.LatLng(51.7519, -1.2578),
pointB = new google.maps.LatLng(50.8429, -0.1313),
myOptions = {
zoom: 7,
center: pointA
},
map = new google.maps.Map(document.getElementById('map-canvas'), myOptions),
// Instantiate a directions service.
directionsService = new google.maps.DirectionsService,
directionsDisplay = new google.maps.DirectionsRenderer({
map: map
}),
markerA = new google.maps.Marker({
position: pointA,
title: "point A",
label: "A",
map: map
}),
markerB = new google.maps.Marker({
position: pointB,
title: "point B",
label: "B",
map: map
});
// get route from A to B
calculateAndDisplayRoute(directionsService, directionsDisplay, pointA, pointB);
}
function calculateAndDisplayRoute(directionsService, directionsDisplay, pointA, pointB) {
directionsService.route({
origin: pointA,
destination: pointB,
travelMode: google.maps.TravelMode.DRIVING
}, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
} else {
window.alert('Directions request failed due to ' + status);
}
});
}
initMap();
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#map-canvas {
height: 100%;
width: 100%;
}
<script src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<div id="map-canvas"></div>
在Jsfiddle上也可以找到示例代码: http://jsfiddle.net/user2314737/u9no8te4/
您可以使用API_KEY发出以下请求来使用Web服务:
https://maps.googleapis.com/maps/api/directions/json?origin=多伦多&destination=蒙特利尔&key=API_KEY
可以在Google开发者控制台中获取API_KEY,每天可免费请求2,500次。
请求的结果可以返回JSON或XML格式,用于在地图上绘制路径。
有关使用Google Maps Directions API的Web服务的官方文档在这里。
function displayRoute() {
var start = new google.maps.LatLng(28.694004, 77.110291);
var end = new google.maps.LatLng(28.72082, 77.107241);
var directionsDisplay = new google.maps.DirectionsRenderer();// also, constructor can get "DirectionsRendererOptions" object
directionsDisplay.setMap(map); // map should be already initialized.
var request = {
origin : start,
destination : end,
travelMode : google.maps.TravelMode.DRIVING
};
var directionsService = new google.maps.DirectionsService();
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});
}
// First Initiate your map. Tie it to some ID in the HTML eg. 'MyMapID'
var map = new google.maps.Map(
document.getElementById('MyMapID'),
{
center: {
lat: Some.latitude,
lng: Some.longitude
}
}
);
// Create a new directionsService object.
var directionsService = new google.maps.DirectionsService;
directionsService.route({
origin: origin.latitude +','+ origin.longitude,
destination: destination.latitude +','+ destination.longitude,
travelMode: 'DRIVING',
}, function(response, status) {
if (status === google.maps.DirectionsStatus.OK) {
var directionsDisplay = new google.maps.DirectionsRenderer({
suppressMarkers: true,
map: map,
directions: response,
draggable: false,
suppressPolylines: true,
// IF YOU SET `suppressPolylines` TO FALSE, THE LINE WILL BE
// AUTOMATICALLY DRAWN FOR YOU.
});
// IF YOU WISH TO APPLY USER ACTIONS TO YOUR LINE YOU NEED TO CREATE A
// `polyLine` OBJECT BY LOOPING THROUGH THE RESPONSE ROUTES AND CREATING A
// LIST
pathPoints = response.routes[0].overview_path.map(function (location) {
return {lat: location.lat(), lng: location.lng()};
});
var assumedPath = new google.maps.Polyline({
path: pathPoints, //APPLY LIST TO PATH
geodesic: true,
strokeColor: '#708090',
strokeOpacity: 0.7,
strokeWeight: 2.5
});
assumedPath.setMap(map); // Set the path object to the map
https://maps.googleapis.com/maps/api/directions/json?parameters
然后解析响应
我正在使用弹出窗口在新窗口中显示地图。我正在使用以下URL:
https://www.google.com/maps?z=15&daddr=LATITUDE,LONGITUDE
HTML片段
<a target='_blank' href='https://www.google.com/maps?z=15&daddr=${location.latitude},${location.longitude}'>Calculate route</a>