Google Maps API V3：如何显示从A点到B点（蓝线）的方向？
我有数据库上的2点经纬度，我希望我的Google地图显示从A点到B点的路线…
就像我们在这里看到的（Google Maps Directions）
如何在地图上绘制方向线？
使用Google Maps API v3的路线服务 。 它基本上与方向API相同，但很好地包装在Google Maps API中，这也提供了便捷的方式在地图上呈现路线。
有关在地图上呈现路线路线的信息和示例可以在Google Maps API v3文档的呈现路线部分中find。
使用Javascript
我创build了一个工作演示，演示如何通过JavaScript在Javascript中使用Google Maps API方向服务
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DirectionsService对象发送和接收方向请求 -
DirectionsRenderer对象在地图上呈现返回的路线
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>
在你的情况下，这是一个使用方向服务的实现。
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); } }); }
使用路线API 。
做一个Ajax调用即
https://maps.googleapis.com/maps/api/directions/json?parameters
然后parsing响应
// 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
