Skip to main content

Drive along - Cool coding

         This is something that will demonstrate to you the power of mapping! This is a Google Maps API v2 example, but just copy and paste the code in an html file and you will see something very cool! This will prove that mapping is real fun!

         Let's have a look at the code first. Copy this code in your html file. Don't worry about the length of the code and the post in general. Just execute the code and you will surely enjoy what you see!

<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>
Drive Along
</title>

<script src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=false&amp;key=ABQIAAAAu3HXU_hLdVPTFGqLed_FCxT2yXp_ZAY8_ufC3CFXhHIE1NvwkxQbblEPYBGNoRsuuSU9aBfSq4VAZA" type="text/javascript">
</script>

<script src="http://econym.org.uk/gmap/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=" " />
<br />
<input type="text" size="80" maxlength="200" id="endpoint" value=" " />
<br />
<input type="submit" value="Start"  />
</form>
</div>

<div id="map" style="width: 700px; height: 500px">
</div>
<div id="step">&nbsp;
</div>
<div id="distance">Miles: 0.00
</div>

<script type="text/javascript">
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 eol;
          var car = new GIcon();
        car.image="http://www.freeiconsweb.com/Freeicons/Car_icon/Dodge%20Viper%20SRT-10.png"
        car.iconSize=new GSize(28,28);
        car.iconAnchor=new GPoint(16,9);
          var marker;
          var k=0;
          var stepnum=0;
          var speed = "";  

          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>";
                  }
            }
            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;
            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});
          }

}
</script>
</body>
</html>


         Please execute the above code and please drop in your comments about what you think about it. You can also drop me a mail about your feedbacks about this code or the blog in general!
Labels:

Comments

  1. OlivierDecember 1, 2010 at 8:20 AM

    Very nice code! Thank you for sharing it =)

    ReplyDelete
  2. Shreerang PatwardhanDecember 1, 2010 at 8:43 AM

    Thanx Olivier...:)

    ReplyDelete
  3. BharathiFebruary 17, 2011 at 12:41 AM

    Shreerang it is really a nice and cool post. Thanks , I am learning a lot from your blog.Keep posting..

    ReplyDelete
  4. Shreerang PatwardhanFebruary 17, 2011 at 8:18 PM

    Thanx Bharathi...:)

    ReplyDelete
  5. AnonymousJune 11, 2011 at 3:17 PM

    what is the format for writing the coordinates in the boxes, as its not working either by dms or dc formats

    ReplyDelete
    Replies
    1. Shreerang PatwardhanOctober 12, 2012 at 3:58 AM

      Co-ordinates should be in degree-decimal format or you can directly enter the addresses also.

      Delete

Post a Comment

Please leave your comments here...

Recommended for You

Where does Google get it's live traffic data from?

Referring to a post that I wrote earlier, Google’s - Live traffic Layer , ever wondered how Google collected this data? I was wondering the other day, how Google received live data to display it on their maps as a layer! I looked up the web and found something very interesting and am sharing the same with you all. As we all know, the traffic layer is available most accurately in several states in USA. Most major metro areas in the US have sensors embedded in their highways. These sensors track real time traffic data. Easy to miss at high speeds (hopefully anyway, traffic permitting), more commonly noticed may be the similar sensors that often exist at many busy intersections that help the traffic lights most efficiently let the most amount of people through. The information from these tracking sensors is reported back to the Department of Transportation (DOT). The DOT uses this data to update some of the digital signs that report traffic conditions in many metro areas. They als...
17 comments
Read more

Playing with the markers and info window bubbles...

    In the last few posts, we have seen some marker examples and some information window examples. Now, lets do something interesting combining these two things. Just writing that "This is an info window" in the information bubble is not very interesting! And I know this...Have gone through the same phase!     So, today we will do something interesting! We will display the latitude- longitude co-ordinates of the point that the user clicks on the map! Doing this is not at all complex! Copy paste the following code and you will see for yourself a map coming to life!     The output of the above code looks as seen in the result section above! If you have any queries regarding the above code please comment on the blog post or feel free to contact me at my mail ID .
3 comments
Read more

Two maps on the same page - Side-by-side

    How good I am feeling to post a code example after such a long time! It's been all "news" over the past so many posts! Well now that I am finally doing a code example, I am posting a very highly requested code sample. Placing two Google Maps on the same page (Now that's simple you would say!), but side by side. Now this is the thing that most people struggle with. Well, implementing the second part is also very simple, as you will see in today's code.     Let's see the code. Here it is!     The output of the above code will be as seen in the result section above.     As most of you will realize, there are two maps, one centered at "Pune" and other at "Noida". Why I chose these two locations? Well, just like that!...The main issue of concern is how the maps appeared side-by-side and not one below the other as would be normal behavior of two "div" elements used in the same page. Now here is the trick! Check out the...
10 comments
Read more

A Giant called Google...

    Wondering what you will be reading in this post today and what is "Google Giant"! Well, I was working on a simple project a couple of months back and that is the time when I was amazed and by the size of data that Google Maps servers might be having! As most of the readers (developers and enthusiast included) would know or might have noticed, Google maps are rendered by stitching small images together. You must have observed this on quite a number of occasions, when you see grey tiles when you have a slow internet connection in particular. It takes time for the images or tiles as we call them to be displayed.     Let us try and estimate what could be the size of the Google Maps data! Before proceeding, let's make a few assumptions and considerations. 1. Let's consider the Google Street View maps only. 2. The zoom level that is considered for the calculations is 21 - the max zoom level allowed on Google Maps API. 3. All the numbers are just an esti...
6 comments
Read more

Jquery Mobile Form - Radio buttons

    Radio buttons - popularly used in forms for single option selection, pose a problem in the mobile web world! The radio buttons being so small as they are, reduce the touch area and it becomes really difficult for selection. Jquery Mobile styles these radio buttons in such a way that they become touch friendly and gel with their overall framework design. Jquery Mobile styles the label for the radio buttons so that they are larger and clickable. A custom set of icons to represent the radio button is added to provide additional visual feedback.     The radio buttons can be used singularly or in a vertical group or can be even grouped horizontally. These radio buttons can be used along with data-mini="true" too, which renders the radio buttons in a smaller size. We will take a look at all this in the example that follows.     In the first implementation you will see, 3 singular radio buttons which are not attached to each other like in the secon...
Post a Comment
Read more