examples/math.html

<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Math - Leap</title>

    <script src="../leap-1.1.1.js"></script>

    <script>

      Leap.loop({

        frame: function(frame){
          var hand = frame.hands[0];
          if (hand){
            var dot = Leap.vec3.dot(hand.direction, hand.indexFinger.direction);

            console.assert(!isNaN(dot));

            out.innerHTML = dot.toPrecision(2);
          }
        }

      });

    </script>

    <style>
      body {
        line-height: 2em;
        font-family: Helvetica;
      }
      #out{
        font-weight: bold;
      }
    </style>

  </head>

  <body>

  <p>
    This page demonstrates the usage of basic vector Math with the Leap.  In this example, we will compute the dot-product,
    of hand direction and index finger direction. This is a measure of how close two vectors are.
  </p>

  <p>
    Find out more in the <a target="_blank" href="http://glmatrix.net/docs/2.2.0/">GL-Matrix Documentation</a> and
    <a href="http://en.wikipedia.org/wiki/Dot_product" target="_blank">Wikipedia</a>.
  </p>

  <p>
    <img src="images/dot-product.png"/>
  </p>

  <br/>
  <p>
    hand.direction &#xb7; hand.indexFinger.direction =
    <span id="out"></span>
  </p>


  </body>

</html>