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Distance calculator using Google Maps API

Posted on 2012-03-09
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Last Modified: 2012-03-22
Please let me know how I can calculate the walking and driving distances using Google Maps API.

If possible, please provide some sample code. Thanks!
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Question by:dshrenik
  • 3
4 Comments
 
LVL 13

Expert Comment

by:Molnar István
ID: 37704444
here is the code i used to calculate the distance from two addresses
in <head></head> put this code:
<script src="http://maps.google.com/maps?file=api&amp;v=2&amp;key=PASTE_API_KEY" type="text/javascript"></script>
       <script language="javascript" type="text/javascript">
     var map = null;
    var geocoder = null;
    var marker1=null;
    var marker2=null;
    var marker1_lat=null;
    var marker2_lat=null;
     var marker1_lon=null;
    var marker2_lon=null;
    var polyline=null;
    function load() 
    {
      if (GBrowserIsCompatible()) 
      {
        map = new GMap2(document.getElementById("map"));
        map.setCenter(new GLatLng(47.4984056, 19.0407578), 13);
        map.setUIToDefault();
        map.addControl(new GOverviewMapControl());
        geocoder = new GClientGeocoder();
      }
    }
    function GeoKodolo(address1,address2) 
    {
    map.clearOverlays();
    polyline=null;
      if (geocoder) 
      {
      //address1
        geocoder.getLatLng
        (
          address1,
          function(point) 
          {
            if (!point) 
            {
              alert("Not found: "+address1+"'");
            } 
            else 
            {
              marker1 = new GMarker(point);
              map.addOverlay(marker1);
              marker1_lat=marker1.getPoint().lat();
              marker1_lon=marker1.getPoint().lng();           
            }
          }
        );
       //address2
       geocoder.getLatLng
        (
          address2,
          function(point) 
          {
            if (!point) 
            {
              alert("Not found: "+address2+" '");
            } 
            else 
            {
              marker2 = new GMarker(point);
              map.addOverlay(marker2);
             marker2_lat=marker2.getPoint().lat();
              marker2_lon=marker2.getPoint().lng();
            }
          }
        ); 
      var polyOptions = {geodesic:true};
      polyline = new GPolyline([
      new GLatLng(marker1_lat, marker1_lon),
      new GLatLng(marker2_lat, marker2_lon)
    ], "#ff0000", 10, 1, polyOptions);
       var mark1=new GLatLng(marker1_lat, marker1_lon);
       var mark2=new GLatLng(marker2_lat, marker2_lon);
       var dist=document.getElementById("dist_lbl");
       dist.innerHTML="Distance"+address1+" and "+address2+" is: "+distance(marker1_lat,marker1_lon,marker2_lat,marker2_lon,"K").toFixed(0)+" Km";    
    map.addOverlay(polyline);
    map.setCenter(polyline,10);
      }//ifend

    }//fugg end
    function distance(lat1, lon1, lat2, lon2, unit) //the funtion that calculates the distance
    {
		var theta = lon1 - lon2;
		var dist = Math.sin(Deg2Rad(lat1)) * Math.sin(Deg2Rad(lat2)) + 
						Math.cos(Deg2Rad(lat1)) * Math.cos(Deg2Rad(lat2)) * Math.cos(Deg2Rad(theta));
		if (dist > 1.0)
			dist=1.0;
		dist = Math.acos(dist);
		dist = Rad2Deg(dist);
		var result = dist * 60 * 1.1515;
		switch (unit.toUpperCase())
		{
			case "M": //mile
				return result;
			break;
			case "K"://km
				return result * 1.609344;
			break;
			case "N"://nautic mile
				return result * 0.8684;
			break;
			default:
				return result * 1.609344;
			break;
		}
    }
 
    function Deg2Rad(deg)
    {
		return deg * Math.PI / 180;
    }
    
    function Rad2Deg(rad)
    {
		 return rad * 180 / Math.PI;
    }
 
</script>    

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in <body></body> put this code:
<center>
			<input type="text" name="address1" id="addr1" value="Budapest, Hungary" style="width: 180px" />
                <input type="text" name="addres2" id="addr2" value="Szeged, Hungary" style="width: 180px; position: static" />
	<a onclick="GeoKodolo(document.getElementById('addr1').value,document.getElementById('addr2').value)"><img alt="[show]" src="img/web_find.png" style="vertical-align: middle; cursor: pointer;" title="[show]" /></a>
                <br/>	
                <div id="dist_lbl"></div>
            </center>		
            <br/>
		    <div id="map" style="width: 620px; height: 400px"></div> 

Open in new window



hope it helps
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LVL 13

Expert Comment

by:Molnar István
ID: 37704446
oh, and i forgot that you must add the following code to initialize the map:
<body onload="load()" onunload="GUnload()">
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Author Comment

by:dshrenik
ID: 37739158
I am having trouble integrating all the pieces. If possible, could you please combine everything into 1 file? Thanks!
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LVL 13

Accepted Solution

by:
Molnar István earned 500 total points
ID: 37753882
here is the entire file
i created a button to search and a select to change the driving type

hope it helps
driving4.html
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