Matrix

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This example is adapted from the Processing Distance 2D example. We demonstrate an equivalent technique for computing the distance from the panel to the mouse using pv.Mark.mouse. One benefit of a pure-JavaScript approach is that user interface events that happen outside of the canvas—such as mouse movement—can still be captured by visualization.

Next: Eyes

Source

<html>
  <head>
    <title>Matrix</title>
    <link rel="stylesheet" type="text/css" href="ex.css"/>
    <script type="text/javascript" src="../protovis-r3.1.0.js"></script>
    <style type="text/css">
      body {
        background: #222;
      }
      #fig {
        width: 200px;
        height: 200px;
      }
    </style>
  </head>
  <body><div id="center"><div id="fig">
    <script type="text/javascript+protovis">

      var vis = new pv.Panel()
          .width(200)
          .height(200)
          .strokeStyle("#aaa");

      vis.add(pv.Panel)
          .data(pv.range(0, 201, 20))
          .left(function(x) x)
        .add(pv.Panel)
          .data(pv.range(0, 201, 20))
          .top(function(y) y)
        .add(pv.Dot)
          .fillStyle("#fff")
          .strokeStyle(null)
          .size(function() this.mouse().length());

      vis.render();
      self.onmousemove = function() vis.render();

    </script>
  </div></div></body>
</html>

Data

This example has no data, making it a meaningless (though fun) visualization!