I want to animate a marker on a route defined between a source and a destination. I got a working example code to understand but it does not seem to be working. When i click on Start Button, I get a javascript error. Object does not support this property or method on the line.
eol=poly.Distance();
Please find the below code. Request you all to please guide if i am missing anything.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script src="epoly.js" type="text/javascript"></script>
</head>
<body onunload="GUnload()">
<div id="controls">
<form onsubmit="start();return false" action="#">
Enter start and end addresses.<br />
<input type="text" size="80" maxlength="200" id="startpoint" value="Briarcrest Rd, 90046" /><br />
<input type="text" size="80" maxlength="200" id="endpoint" value="Hollywood Hills Rd, 90046@34.11327,-118.39089" /><br />
<input type="submit" value="Start" />
</form>
</div>
<div id="map" style="width: 700px; height: 500px"></div>
<div id="step"> </div>
<div id="distance">Miles: 0.00</div>
<script type="text/javascript">
//<![CDATA[
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById("map"));
map.addControl(new GMapTypeControl());
map.setCenter(new GLatLng(0,0),2);
var dirn = new GDirections();
var step = 5; // metres
var tick = 100; // milliseconds
var poly;
var poly2;
var lastVertex = 0;
var eol;
var car = new GIcon();
car.image="caricon.png"
car.iconSize=new GSize(32,18);
car.iconAnchor=new GPoint(16,9);
var marker;
var k=0;
var stepnum=0;
var speed = "";
function updatePoly(d) {
// Spawn a new polyline every 20 vertices, because updating a 100-vertex poly is too slow
if (poly2.getVertexCount() > 20) {
poly2=new GPolyline([poly.getVertex(lastVertex-1)]);
map.addOverlay(poly2)
}
if (poly.GetIndexAtDistance(d) < lastVertex+2) {
if (poly2.getVertexCount()>1) {
poly2.deleteVertex(poly2.getVertexCount()-1)
}
poly2.insertVertex(poly2.getVertexCount(),poly.GetPointAtDistance(d));
} else {
poly2.insertVertex(poly2.getVertexCount(),poly.getVertex(lastVertex++));
}
}
function animate(d) {
if (d>eol) {
document.getElementById("step").innerHTML = "<b>Trip completed<\/b>";
document.getElementById("distance").innerHTML = "Miles: "+(d/1609.344).toFixed(2);
return;
}
var p = poly.GetPointAtDistance(d);
if (k++>=180/step) {
map.panTo(p);
k=0;
}
marker.setPoint(p);
document.getElementById("distance").innerHTML = "Miles: "+(d/1609.344).toFixed(2)+speed;
if (stepnum+1 < dirn.getRoute(0).getNumSteps()) {
if (dirn.getRoute(0).getStep(stepnum).getPolylineIndex() < poly.GetIndexAtDistance(d)) {
stepnum++;
var steptext = dirn.getRoute(0).getStep(stepnum).getDescriptionHtml();
document.getElementById("step").innerHTML = "<b>Next:<\/b> "+steptext;
var stepdist = dirn.getRoute(0).getStep(stepnum-1).getDistance().meters;
var steptime = dirn.getRoute(0).getStep(stepnum-1).getDuration().seconds;
var stepspeed = ((stepdist/steptime) * 2.24).toFixed(0);
step = stepspeed/2.5;
speed = "<br>Current speed: " + stepspeed +" mph";
}
} else {
if (dirn.getRoute(0).getStep(stepnum).getPolylineIndex() < poly.GetIndexAtDistance(d)) {
document.getElementById("step").innerHTML = "<b>Next: Arrive at your destination<\/b>";
}
}
updatePoly(d);
setTimeout("animate("+(d+step)+")", tick);
}
GEvent.addListener(dirn,"load", function() {
document.getElementById("controls").style.display="none";
poly=dirn.getPolyline();
eol=poly.Distance();
map.setCenter(poly.getVertex(0),17);
map.addOverlay(new GMarker(poly.getVertex(0),G_START_ICON));
map.addOverlay(new GMarker(poly.getVertex(poly.getVertexCount()-1),G_END_ICON));
marker = new GMarker(poly.getVertex(0),{icon:car});
map.addOverlay(marker);
var steptext = dirn.getRoute(0).getStep(stepnum).getDescriptionHtml();
document.getElementById("step").innerHTML = steptext;
poly2 = new GPolyline([poly.getVertex(0)]);
map.addOverlay(poly2);
setTimeout("animate(0)",2000); // Allow time for the initial map display
});
GEvent.addListener(dirn,"error", function() {
alert("Location(s) not recognised. Code: "+dirn.getStatus().code);
});
function start() {
var startpoint = document.getElementById("startpoint").value;
var endpoint = document.getElementById("endpoint").value;
dirn.loadFromWaypoints([startpoint,endpoint],{getPolyline:true,getSteps:true});
}
}
// This Javascript is based on code provided by the
// Community Church Javascript Team
// http://www.bisphamchurch.org.uk/
// http://econym.org.uk/gmap/
//]]>
</script>
</body>
</html>
You are using the deprecated (and turned off) Google Maps Javascript API v2:
<script src="http://maps.google.com/maps?file=api&v=2&sensor=false" type="text/javascript"></script>
That is currently being replaced by a wrapper for the Google Maps Javascript API v3. It will only work for simple maps.
And update to the v3 version of epoly, this is the v2 version (unless you modified it yourself).
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
来源：https://stackoverflow.com/questions/20145848/marker-animation-not-working-on-google-maps-api