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Projecting HTML Elements on a circle using Javascript

Recently I wonted to create a tree control with a different approach. The requirement was to represent a node tree with main node on the circle center and it's child nodes projected on a circle around it. This is what i wanted.









My solution has 5 files


  1. prototype.js

    This is a handy javascript framework. You can download the latest version from there website (www.prototypejs.org/download). I am using this to simply handle the onload event in the page.

  2. circle.html

  3. script.js

  4. node-main-left.gif

  5. node-sub-left.gif


The circle.html, prototype.js and the script.js files are in the root folder and the two images are inside a folder named “images”.

This is how the html file looks(circle.html). 

<html>

<head>

<script src="prototype.js" type="text/javascript"></script>

<script src="script.js" type="text/javascript"></script>

<script language="javascript" xml:space="preserve">

   // <![CDATA[

   Event.observe(window, 'load', showTree);

   // ]]>

</script>

<style type="text/css">

   .asso-content {

       margin-left: 10px;

       height: 200px;

       overflow: auto;

   }



   .node-main div, .node-sub div {

       float: left;

   }



   .node-content {

       line-height: 29px;

       text-indent: 5px;

       border: solid 1px #cccccc;

       border-left: none;

       background-color: #ffffff;

       padding-right: 3px;

   }



   .node-sub {

       position: absolute;

   }

</style>



<title>Association Tree</title>

</head>

<body>

<div id="assoContent" class="asso-content">

</div>

</body>

</html>


The script.js file contain the logic to create the nodes in circle. The whole logic is base on the following principle.



This is the script.js file 

function showTree() {

  var assoContent = document.getElementById('assoContent');

  //Define the center of the circle (cs,cy)

  var cx = 100;

  var cy = 100;



  //Place the main node on the center of the circle (cx,cy)

  var main_node = "
\"\"
/foo/bar
";

  assoContent.innerHTML = main_node;



  //This has to be get from the server side

  var n = 6;                                //Number of child nodes

  var r = 100;                              //The radious of the circle



  //Calculate n if the number of child nodes are grater than 10

  if (n > 10) r = r + r * n;

  var cone = 2 * (22 / 7) / n;



  //Finding the cordinates of the points and show them

  var x,y,new_node;

  for (var i = 0; i < x =" cx" y =" cy" x =" Math.round(x);" y =" Math.round(y);" new_node =" document.createElement('DIV');" csstext = "margin-left:" classname = "node-sub" innerhtml =" ">\"\"
/foo/bar
"

      assoContent.appendChild(new_node);

  }



}

Please read the in-line comments in the script.js file.


The two images (node-main-left.gif, node-sub-left.gif) are here respectively.




Download code from
http://sites.google.com/site/chanaka3d/Home/code.zip?attredirects=0
Labels:

Comments

David Pahl said…
Seems the code-box is breaking the circle.js

Do you have a demo link?
September 29, 2008 at 8:06 AM
chanaka said…
Sorry.I haven't got a demo for this. But you can download the code from the following url.

http://download42.mediafire.com/fyytzetn3gsg/m3m5nmmynza/code.zip

And one more thing..

The lines connecting each element is not implemented on this code.
October 1, 2008 at 12:27 AM
rajika said…
Nice post machang!
October 1, 2008 at 6:53 PM
Wayde Gilliam said…
Couple of questions:

1. So how do you display the lines relating ea. child to the parent?

2. Does the code allow for variable sized nodes?

Thanks - wg
November 7, 2008 at 1:33 PM
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December 18, 2011 at 4:54 AM
Kev Zettler said…
Hey this is a great post How do you calculate the cone? whats the details on that
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