我在地图上有几个标记，绘制了折线。我想沿着折线的路径移动每个标记，以模拟每个标记的同时移动。
我在做这个问题时遇到的问题只是移动的最后一个标记而其余部分没有。作为使用这种编程技术的新手，我认为我的代码有问题，特别是我试图为每个标记设置动画的方式。我需要一些指导。
到目前为止，这是我的工作：Jsbin DEMO
var startLoc = new Array();
startLoc[0] = 'rio claro, trinidad';
startLoc[1] = 'preysal, trinidad';
startLoc[2] = 'san fernando, trinidad';
startLoc[3] = 'couva, trinidad';
var endLoc = new Array();
endLoc[0] = 'princes town, trinidad';
endLoc[1] = 'tabaquite, trinidad';
endLoc[2] = 'mayaro, trinidad';
endLoc[3] = 'arima, trinidad';
var Colors = ["#FF0000", "#00FF00", "#0000FF"];
function initialize() {
infowindow = new google.maps.InfoWindow(
{
size: new google.maps.Size(150,50)
});
var myOptions = {
zoom: 10,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
address = 'Trinidad and Tobago'
geocoder = new google.maps.Geocoder();
geocoder.geocode( { 'address': address}, function(results, status) {
map.setCenter(results[0].geometry.location);
});
}
function createMarker(latlng, label, html) {
// alert("createMarker("+latlng+","+label+","+html+","+color+")");
var contentString = '<b>'+label+'</b><br>'+html;
var marker = new google.maps.Marker({
position: latlng,
map: map,
title: label,
zIndex: Math.round(latlng.lat()*-100000)<<5
});
marker.myname = label;
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(contentString);
infowindow.open(map,marker);
});
return marker;
}
function setRoutes(){
var directionsDisplay = new Array();
for (var i=0; i< startLoc.length; i++){
var rendererOptions = {
map: map,
suppressMarkers : true
}
directionsService = new google.maps.DirectionsService();
var travelMode = google.maps.DirectionsTravelMode.DRIVING;
var request = {
origin: startLoc[i],
destination: endLoc[i],
travelMode: travelMode
};
directionsService.route(request,makeRouteCallback(directionsDisplay[i]));
}
function makeRouteCallback(disp){
return function(response, status){
if (status == google.maps.DirectionsStatus.OK){
var bounds = new google.maps.LatLngBounds();
var route = response.routes[0];
startLocation = new Object();
endLocation = new Object();
polyline = new google.maps.Polyline({
path: [],
strokeColor: '#FFFF00',
strokeWeight: 3
});
poly2 = new google.maps.Polyline({
path: [],
strokeColor: '#FFFF00',
strokeWeight: 3
});
// For each route, display summary information.
var path = response.routes[0].overview_path;
var legs = response.routes[0].legs;
//Routes
if (status == google.maps.DirectionsStatus.OK){
console.log(response);
disp = new google.maps.DirectionsRenderer(rendererOptions);
disp.setMap(map);
disp.setDirections(response);
//Markers
for (i=0;i<legs.length;i++) {
if (i == 0) {
startLocation.latlng = legs[i].start_location;
startLocation.address = legs[i].start_address;
// marker = google.maps.Marker({map:map,position: startLocation.latlng});
marker = createMarker(legs[i].start_location,"start",legs[i].start_address,"green");
}
endLocation.latlng = legs[i].end_location;
endLocation.address = legs[i].end_address;
var steps = legs[i].steps;
for (j=0;j<steps.length;j++) {
var nextSegment = steps[j].path;
var nextSegment = steps[j].path;
for (k=0;k<nextSegment.length;k++) {
polyline.getPath().push(nextSegment[k]);
//bounds.extend(nextSegment[k]);
}
}
}
}
}
polyline.setMap(map);
//map.fitBounds(bounds);
startAnimation();
}
}
}
var lastVertex = 1;
var stepnum=0;
var step = 50; // 5; // metres
var tick = 100; // milliseconds
var eol;
//----------------------------------------------------------------------
function updatePoly(d) {
// Spawn a new polyline every 20 vertices, because updating a 100-vertex poly is too slow
if (poly2.getPath().getLength() > 20) {
poly2=new google.maps.Polyline([polyline.getPath().getAt(lastVertex-1)]);
// map.addOverlay(poly2)
}
if (polyline.GetIndexAtDistance(d) < lastVertex+2) {
if (poly2.getPath().getLength()>1) {
poly2.getPath().removeAt(poly2.getPath().getLength()-1)
}
poly2.getPath().insertAt(poly2.getPath().getLength(),polyline.GetPointAtDistance(d));
} else {
poly2.getPath().insertAt(poly2.getPath().getLength(),endLocation.latlng);
}
}
//----------------------------------------------------------------------------
function animate(d) {
if (d>eol) {
marker.setPosition(endLocation.latlng);
return;
}
var p = polyline.GetPointAtDistance(d);
//map.panTo(p);
marker.setPosition(p);
updatePoly(d);
timerHandle = setTimeout("animate("+(d+step)+")", tick);
}
//-------------------------------------------------------------------------
function startAnimation() {
eol=polyline.Distance();
map.setCenter(polyline.getPath().getAt(0));
poly2 = new google.maps.Polyline({path: [polyline.getPath().getAt(0)], strokeColor:"#FFFF00", strokeWeight:3});
setTimeout("animate(50)",2000); // Allow time for the initial map display
}
//----------------------------------------------------------------------------
</script>
</head>
<body onload="initialize()">
<div id="tools">
<button onclick="setRoutes();">Start</button>
</div>
<div id="map_canvas" style="width:100%;height:100%;"></div>
答案 0 :(得分：3)
如果要为多个标记设置动画，则必须更改animate和startAnimation函数以处理多个标记（可能将所有变量都放入数组中）。
代码段：
var map;
var directionDisplay;
var directionsService;
var stepDisplay;
var position;
var marker = [];
var polyline = [];
var poly2 = [];
var poly = null;
var startLocation = [];
var endLocation = [];
var timerHandle = [];
var speed = 0.000005, wait = 1;
var infowindow = null;
var myPano;
var panoClient;
var nextPanoId;
var startLoc = new Array();
startLoc[0] = 'rio claro, trinidad';
startLoc[1] = 'preysal, trinidad';
startLoc[2] = 'san fernando, trinidad';
startLoc[3] = 'couva, trinidad';
var endLoc = new Array();
endLoc[0] = 'princes town, trinidad';
endLoc[1] = 'tabaquite, trinidad';
endLoc[2] = 'mayaro, trinidad';
endLoc[3] = 'arima, trinidad';
var Colors = ["#FF0000", "#00FF00", "#0000FF"];
function initialize() {
infowindow = new google.maps.InfoWindow(
{
size: new google.maps.Size(150,50)
});
var myOptions = {
zoom: 10,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
address = 'Trinidad and Tobago'
geocoder = new google.maps.Geocoder();
geocoder.geocode( { 'address': address}, function(results, status) {
map.fitBounds(results[0].geometry.viewport);
});
// setRoutes();
}
function createMarker(latlng, label, html) {
// alert("createMarker("+latlng+","+label+","+html+","+color+")");
var contentString = '<b>'+label+'</b><br>'+html;
var marker = new google.maps.Marker({
position: latlng,
map: map,
title: label,
zIndex: Math.round(latlng.lat()*-100000)<<5
});
marker.myname = label;
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(contentString);
infowindow.open(map,marker);
});
return marker;
}
function setRoutes(){
var directionsDisplay = new Array();
for (var i=0; i< startLoc.length; i++){
var rendererOptions = {
map: map,
suppressMarkers : true,
preserveViewport: true
}
directionsService = new google.maps.DirectionsService();
var travelMode = google.maps.DirectionsTravelMode.DRIVING;
var request = {
origin: startLoc[i],
destination: endLoc[i],
travelMode: travelMode
};
directionsService.route(request,makeRouteCallback(i,directionsDisplay[i]));
}
function makeRouteCallback(routeNum,disp){
if (polyline[routeNum] && (polyline[routeNum].getMap() != null)) {
startAnimation(routeNum);
return;
}
return function(response, status){
if (status == google.maps.DirectionsStatus.OK){
var bounds = new google.maps.LatLngBounds();
var route = response.routes[0];
startLocation[routeNum] = new Object();
endLocation[routeNum] = new Object();
polyline[routeNum] = new google.maps.Polyline({
path: [],
strokeColor: '#FFFF00',
strokeWeight: 3
});
poly2[routeNum] = new google.maps.Polyline({
path: [],
strokeColor: '#FFFF00',
strokeWeight: 3
});
// For each route, display summary information.
var path = response.routes[0].overview_path;
var legs = response.routes[0].legs;
disp = new google.maps.DirectionsRenderer(rendererOptions);
disp.setMap(map);
disp.setDirections(response);
//Markers
for (i=0;i<legs.length;i++) {
if (i == 0) {
startLocation[routeNum].latlng = legs[i].start_location;
startLocation[routeNum].address = legs[i].start_address;
// marker = google.maps.Marker({map:map,position: startLocation.latlng});
marker[routeNum] = createMarker(legs[i].start_location,"start",legs[i].start_address,"green");
}
endLocation[routeNum].latlng = legs[i].end_location;
endLocation[routeNum].address = legs[i].end_address;
var steps = legs[i].steps;
for (j=0;j<steps.length;j++) {
var nextSegment = steps[j].path;
var nextSegment = steps[j].path;
for (k=0;k<nextSegment.length;k++) {
polyline[routeNum].getPath().push(nextSegment[k]);
//bounds.extend(nextSegment[k]);
}
}
}
}
polyline[routeNum].setMap(map);
//map.fitBounds(bounds);
startAnimation(routeNum);
} // else alert("Directions request failed: "+status);
}
}
var lastVertex = 1;
var stepnum=0;
var step = 50; // 5; // metres
var tick = 100; // milliseconds
var eol= [];
//----------------------------------------------------------------------
function updatePoly(i,d) {
// Spawn a new polyline every 20 vertices, because updating a 100-vertex poly is too slow
if (poly2[i].getPath().getLength() > 20) {
poly2[i]=new google.maps.Polyline([polyline[i].getPath().getAt(lastVertex-1)]);
// map.addOverlay(poly2)
}
if (polyline[i].GetIndexAtDistance(d) < lastVertex+2) {
if (poly2[i].getPath().getLength()>1) {
poly2[i].getPath().removeAt(poly2[i].getPath().getLength()-1)
}
poly2[i].getPath().insertAt(poly2[i].getPath().getLength(),polyline[i].GetPointAtDistance(d));
} else {
poly2[i].getPath().insertAt(poly2[i].getPath().getLength(),endLocation[i].latlng);
}
}
//----------------------------------------------------------------------------
function animate(index,d) {
if (d>eol[index]) {
marker[index].setPosition(endLocation[index].latlng);
return;
}
var p = polyline[index].GetPointAtDistance(d);
//map.panTo(p);
marker[index].setPosition(p);
updatePoly(index,d);
timerHandle[index] = setTimeout("animate("+index+","+(d+step)+")", tick);
}
//-------------------------------------------------------------------------
function startAnimation(index) {
if (timerHandle[index]) clearTimeout(timerHandle[index]);
eol[index]=polyline[index].Distance();
map.setCenter(polyline[index].getPath().getAt(0));
poly2[index] = new google.maps.Polyline({path: [polyline[index].getPath().getAt(0)], strokeColor:"#FFFF00", strokeWeight:3});
timerHandle[index] = setTimeout("animate("+index+",50)",2000); // Allow time for the initial map display
}
//----------------------------------------------------------------------------
google.maps.event.addDomListener(window,'load',initialize);
//src="http://www.geocodezip.com/scripts/v3_epoly.js"
/*********************************************************************\
* *
* epolys.js by Mike Williams *
* updated to API v3 by Larry Ross *
* *
* A Google Maps API Extension *
* *
* Adds various Methods to google.maps.Polygon and google.maps.Polyline *
* .Distance() returns the length of the poly path *
* *
* .GetPointAtDistance() returns a GLatLng at the specified distance *
* along the path. *
* The distance is specified in metres *
* Reurns null if the path is shorter than that *
* *
* .GetPointsAtDistance() returns an array of GLatLngs at the *
* specified interval along the path. *
* The distance is specified in metres *
* *
\*********************************************************************/
// === first support methods that don't (yet) exist in v3
google.maps.LatLng.prototype.distanceFrom = function(newLatLng) {
var EarthRadiusMeters = 6378137.0; // meters
var lat1 = this.lat();
var lon1 = this.lng();
var lat2 = newLatLng.lat();
var lon2 = newLatLng.lng();
var dLat = (lat2-lat1) * Math.PI / 180;
var dLon = (lon2-lon1) * Math.PI / 180;
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(lat1 * Math.PI / 180 ) * Math.cos(lat2 * Math.PI / 180 ) *
Math.sin(dLon/2) * Math.sin(dLon/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = EarthRadiusMeters * c;
return d;
}
google.maps.LatLng.prototype.latRadians = function() {
return this.lat() * Math.PI/180;
}
google.maps.LatLng.prototype.lngRadians = function() {
return this.lng() * Math.PI/180;
}
// === A method which returns the length of a path in metres ===
google.maps.Polyline.prototype.Distance = function() {
var dist = 0;
for (var i=1; i < this.getPath().getLength(); i++) {
dist += this.getPath().getAt(i).distanceFrom(this.getPath().getAt(i-1));
}
return dist;
}
// === A method which returns a GLatLng of a point a given distance along the path ===
// === Returns null if the path is shorter than the specified distance ===
google.maps.Polyline.prototype.GetPointAtDistance = function(metres) {
// some awkward special cases
if (metres == 0) return this.getPath().getAt(0);
if (metres < 0) return null;
if (this.getPath().getLength() < 2) return null;
var dist=0;
var olddist=0;
for (var i=1; (i < this.getPath().getLength() && dist < metres); i++) {
olddist = dist;
dist += this.getPath().getAt(i).distanceFrom(this.getPath().getAt(i-1));
}
if (dist < metres) {
return null;
}
var p1= this.getPath().getAt(i-2);
var p2= this.getPath().getAt(i-1);
var m = (metres-olddist)/(dist-olddist);
return new google.maps.LatLng( p1.lat() + (p2.lat()-p1.lat())*m, p1.lng() + (p2.lng()-p1.lng())*m);
}
// === A method which returns an array of GLatLngs of points a given interval along the path ===
google.maps.Polyline.prototype.GetPointsAtDistance = function(metres) {
var next = metres;
var points = [];
// some awkward special cases
if (metres <= 0) return points;
var dist=0;
var olddist=0;
for (var i=1; (i < this.getPath().getLength()); i++) {
olddist = dist;
dist += this.getPath().getAt(i).distanceFrom(this.getPath().getAt(i-1));
while (dist > next) {
var p1= this.getPath().getAt(i-1);
var p2= this.getPath().getAt(i);
var m = (next-olddist)/(dist-olddist);
points.push(new google.maps.LatLng( p1.lat() + (p2.lat()-p1.lat())*m, p1.lng() + (p2.lng()-p1.lng())*m));
next += metres;
}
}
return points;
}
// === A method which returns the Vertex number at a given distance along the path ===
// === Returns null if the path is shorter than the specified distance ===
google.maps.Polyline.prototype.GetIndexAtDistance = function(metres) {
// some awkward special cases
if (metres == 0) return this.getPath().getAt(0);
if (metres < 0) return null;
var dist=0;
var olddist=0;
for (var i=1; (i < this.getPath().getLength() && dist < metres); i++) {
olddist = dist;
dist += this.getPath().getAt(i).distanceFrom(this.getPath().getAt(i-1));
}
if (dist < metres) {return null;}
return i;
}html{height:100%;}
body{height:100%;margin:0px;font-family: Helvetica,Arial;}<script type="text/javascript" src="http://maps.google.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="tools">
<button onclick="setRoutes();">Start</button>
</div>
<div id="map_canvas" style="width:100%;height:100%;"></div>
答案 1 :(得分：0)
你在var循环中使用了许多未在for()中声明的变量。最值得注意的是for (i=...中的makeRouteCallback(disp) i setRoutes()。{{1}}中已存在变量{{1}}。我认为这可能会导致这种行为。