PlaceEngine API Programming Samples
Here we introduce a collection of programming samples that use the PlaceEngine API.
Sample 1: Hybrid Position Estimation using JavaScript
This sample estimates the current position (latitude/longitude) using the Hybrid Estimation feature (only available when using the Windows version of PlaceEngine Client). Please click here to run this sample in a separate page.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>PlaceEngine Logger</title>
<script type="text/javascript">
var timer=null;
var appk="......"; // specify the application key here
var lastElement=null;
function startLogging()
{
timer = setTimeout("getPosition()",0);
}
function stopLogging()
{
if( timer != null ){
clearTimeout(timer);
timer=null;
}
}
function clearLog()
{
document.getElementById("output").innerHTML = "";
}
function getPosition()
{
if( timer==null )
return;
var script = document.createElement('script');
script.type = "text/javascript";
script.charset = "UTF-8";
script.src = "http://localhost:5448/getlocjs?m=g,l,p&usecache=0&fmt=jsonp&appk=" + appk
+ "&t=" + parseInt(((new Date()).getTime()/1000));
if( lastElement!=null ){
document.body.removeChild(lastElement);
lastElement = null;
}
lastElement = document.body.appendChild(script);
}
function recvLoc2(results)
{
if( timer==null )
return;
if(!(results instanceof Array)) {
results = [results];
}
for(var i=0; i<results.length; i++) {
var data = results[i];
var t = new Date();
t.setTime(data.t*1000);
var method="";
switch(data.m){
case "p": method="PlaceEngine server"; break;
case "l": method="LocalDB"; break;
case "g": method="GPS"; break;
}
var str = "time=" + t.toLocaleString()
+ ", result=" + data.r
+ "," + (data.r >= 0 ? " lat=" + data.y : "")
+ "," + (data.r >= 0 ? " lon=" + data.x : "")
+ ", method=" + method
;
if( data.info != null && data.info.addr != null )
str += ", addr=" + data.info.addr;
str += "<br>";
document.getElementById("output").innerHTML += str;
}
if( timer!=null )
timer = setTimeout("getPosition()",10000);
}
</script>
</head>
<body>
<input type="button" value="Start Logging" onClick="javascript:startLogging()">
<input type="button" value="Stop Logging" onClick="javascript:stopLogging()">
<input type="button" value="Clear Log" onClick="javascript:clearLog()">
<hr>
<span id="output"></span>
</body>
</html>