我在绘制了折线的地图上有几个标记。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。
我在执行此操作时遇到问题，我只能移动最后一个标记，其余的则没有。作为使用这种编程技术的新手，我认为我的代码有问题，尤其是我尝试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>