我正在尝试在播放映射路线时绘制已访问的路径，如以下示例所示:
加载 map 时，我希望绘制的点 A、B、C、D、E 和 F 一个接一个地连接起来。
我已经成功地绘制了这些点，但是我不能一个接一个地动态链接这些点。
这是我的代码:
<script type="text/javascript">
var markers = [{
"title": 'Alibaug',
"lat": '12.97721863',
"lng": '80.22206879',
"description": 'Alibaug is a coastal town and a municipal council in Raigad District in the Konkan region of Maharashtra, India.'
}, {
"title": 'Mumbai',
"lat": '12.9962529',
"lng": '80.2570098',
"description": 'Mumbai formerly Bombay, is the capital city of the Indian state of Maharashtra.'
}, {
"title": 'Pune',
"lat": '12.97722816',
"lng": '80.22219086',
"description": 'Pune is the seventh largest metropolis in India, the second largest in the state of Maharashtra after Mumbai.'
}];
window.onload = function() {
var mapOptions = {
center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
zoom: 10,
mapTypeId: google.maps.MapTypeId.ROADMAP,};
var map = new google.maps.Map(document.getElementById("dvMap"), mapOptions);
//*********** GOOGLE MAP SEARCH ****************//
// Create the search box and link it to the UI element.
var input = /** @type {HTMLInputElement} */ (
document.getElementById('pac-input'));
map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);
var searchBox = new google.maps.places.SearchBox(
/** @type {HTMLInputElement} */
(input));
// Listen for the event fired when the user selects an item from the
// pick list. Retrieve the matching places for that item.
google.maps.event.addListener(searchBox, 'places_changed', function() {
var places = searchBox.getPlaces();
for (var i = 0, marker; marker = markers[i]; i++) {
// marker.setMap(null);
}
// For each place, get the icon, place name, and location.
markers = [];
var bounds = new google.maps.LatLngBounds();
var place = null;
var viewport = null;
for (var i = 0; place = places[i]; i++) {
var image = {
url: place.icon,
size: new google.maps.Size(71, 71),
origin: new google.maps.Point(0, 0),
anchor: new google.maps.Point(17, 34),
scaledSize: new google.maps.Size(25, 25)
};
// Create a marker for each place.
var marker = new google.maps.Marker({
map: map,
icon: image,
title: place.name,
position: place.geometry.location
});
viewport = place.geometry.viewport;
markers.push(marker);
bounds.extend(place.geometry.location);
}
map.setCenter(bounds.getCenter());
});
// Bias the SearchBox results towards places that are within the bounds of the
// current map's viewport.
google.maps.event.addListener(map, 'bounds_changed', function() {
var bounds = map.getBounds();
searchBox.setBounds(bounds);
});
//***********Google Map Search Ends****************//
var infoWindow = new google.maps.InfoWindow();
var lat_lng = new Array();
var latlngbounds = new google.maps.LatLngBounds();
for (i = 0; i < markers.length; i++) {
var data = markers[i]
var myLatlng = new google.maps.LatLng(data.lat, data.lng);
lat_lng.push(myLatlng);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: data.title
});
latlngbounds.extend(marker.position);
(function(marker, data) {
google.maps.event.addListener(marker, "click", function(e) {
infoWindow.setContent(data.description);
infoWindow.open(map, marker);
});
})(marker, data);
}
map.setCenter(latlngbounds.getCenter());
map.fitBounds(latlngbounds);
//***********ROUTING****************//
//Initialize the Path Array
var path = new google.maps.MVCArray();
//Initialize the Direction Service
var service = new google.maps.DirectionsService();
//Set the Path Stroke Color
var poly = new google.maps.Polyline({
map: map,
strokeColor: '#4986E7'
});
//Loop and Draw Path Route between the Points on MAP
for (var i = 0; i < lat_lng.length; i++) {
if ((i + 1) < lat_lng.length) {
var src = lat_lng[i];
var des = lat_lng[i + 1];
path.push(src);
poly.setPath(path);
service.route({
origin: src,
destination: des,
travelMode: google.maps.DirectionsTravelMode.DRIVING
}, function(result, status) {
if (status == google.maps.DirectionsStatus.OK) {
for (var i = 0, len = result.routes[0].overview_path.length; i < len; i++) {
path.push(result.routes[0].overview_path[i]);
}
}
});
}
}
}
function handleLocationError(browserHasGeolocation, infoWindow, pos) {
infoWindow.setPosition(pos);
infoWindow.setContent(browserHasGeolocation ?
'Error: The Geolocation service failed.' :
'Error: Your browser doesn\'t support geolocation.');
}
输出类似于:
我如何回放显示这条 map 路线上的点？有没有实例？
最佳答案
在 https://duncan99.wordpress.com/2015/01/22/animated-paths-with-google-maps/ 有一篇很好的博文和示例代码解释如何为路线设置动画。
该示例与您的问题之间的区别在于您的 route 有路标。您可以使用路标一次获取整个路线，也可以像在上面的代码中那样获取路线。我在下面包含了一个使用航路点的编码片段(免费版本的谷歌地图最多 8 个)。如果您在代码中使用该方法，则需要确保在开始动画之前已加载整个路径。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Map Example</title>
</head>
<body>
<button id="animate">Redo Animation</button>
<div id="map_canvas" style="width: 600px;height: 600px"></div>
<script type="text/javascript">
var markers = [{
"title": 'Alibaug',
"lat": '18.6581725',
"lng": '72.8637616',
"description": 'Alibaug is a coastal town and a municipal council in Raigad District in the Konkan region of Maharashtra, India.'
}, {
"title": 'Mumbai',
"lat": '19.0458547',
"lng": '72.9434202',
"description": 'Mumbai formerly Bombay, is the capital city of the Indian state of Maharashtra.'
}, {
"title": 'Pune',
"lat": '18.5247663',
"lng": '73.7929273',
"description": 'Pune is the seventh largest metropolis in India, the second largest in the state of Maharashtra after Mumbai.'
}];
function animatePath(map, route, marker, pathCoords) {
var index = 0;
route.setPath([]);
for (var index = 0; index < pathCoords.length; index++)
setTimeout(function(offset) {
route.getPath().push(pathCoords.getAt(offset));
marker.setPosition(pathCoords.getAt(offset));
map.panTo(pathCoords.getAt(offset));
}, index * 30, index);
}
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
zoom: 20,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
var infoWindow = new google.maps.InfoWindow();
var latlngbounds = new google.maps.LatLngBounds();
for (i = 0; i < markers.length; i++) {
var data = markers[i];
markers[i].latLng = new google.maps.LatLng(data.lat, data.lng);
var marker = new google.maps.Marker({
position: markers[i].latLng,
map: map,
title: data.title
});
marker.description = markers[i].description;
latlngbounds.extend(marker.position);
google.maps.event.addListener(marker, "click", function(e) {
infoWindow.setContent(this.description);
infoWindow.open(map, this);
});
}
map.setCenter(latlngbounds.getCenter());
map.fitBounds(latlngbounds);
//Initialize the Path Array
var path = new google.maps.MVCArray();
//Initialize the Direction Service
var service = new google.maps.DirectionsService();
// Get the route between the points on the map
var wayPoints = [];
for (var i = 1; i < markers.length - 1; i++) {
wayPoints.push({
location: markers[i].latLng,
stopover: false
});
}
//Initialize the path
var poly = new google.maps.Polyline({
map: map,
strokeColor: '#4986E7'
});
var traceMarker = new google.maps.Marker({
map: map,
icon: "http://maps.google.com/mapfiles/ms/micons/blue.png"
});
if (markers.length >= 2) {
service.route({
origin: markers[0].latLng,
destination: markers[markers.length - 1].latLng,
waypoints: wayPoints,
travelMode: google.maps.DirectionsTravelMode.DRIVING
}, function(result, status) {
if (status == google.maps.DirectionsStatus.OK) {
for (var j = 0, len = result.routes[0].overview_path.length; j < len; j++) {
path.push(result.routes[0].overview_path[j]);
}
animatePath(map, poly, traceMarker, path);
}
});
}
document.getElementById("animate").addEventListener("click", function() {
// Animate the path when the button is clicked
animatePath(map, poly, traceMarker, path);
});
};
</script>
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false&callback=initialize"></script>
</body>
</html>关于javascript - 使用 Google Maps API 绘制 map 路径/航路点并播放路线，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36846983/