colorbrewer2.html

<html>

<head>
  <meta charset="utf-8">
  <title>Material brewer</title>
  <!-- source Colorpicker slider: http://jqueryui.com/slider/#colorpicker -->
  <link rel="stylesheet" type="text/css" href="x3dom.css">
  <link rel="stylesheet" href="https://code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css">
  </link>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
  <script src="https://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
  </link>
  <style>
    #red,
    #green,
    #blue {
      float: left;
      clear: left;
      width: 300px;
      margin: 15px;
    }

    #red .ui-slider-range {
      background: #ef2929;
    }

    #red .ui-slider-handle {
      border-color: #ef2929;
    }

    #green .ui-slider-range {
      background: #8ae234;
    }

    #green .ui-slider-handle {
      border-color: #8ae234;
    }

    #blue .ui-slider-range {
      background: #729fcf;
    }

    #blue .ui-slider-handle {
      border-color: #729fcf;
    }
  </style>
</head>

<body class="ui-widget-content" style="border:0;">
  <table width="100%" height="85%" border="0">
    <tr>
      <td width="50%" align="center" valign="top" scope="col">
        <X3D id="shapedata" width="600px" height="600px" style="float:left">
          <Scene>
            <Shape>
              <Appearance>
                <Material id="material" diffuseColor="0.980, 0.502, 0.447"> </Material>
              </Appearance>
              <Sphere radius="2.0"> </Sphere>
            </Shape>
          </Scene>
        </X3D>
      </td>
      <td width="50%" align="left" valign="top" scope="col">
        <p>The following example will show you haw to interactively modify the 3D scene.</p>
        <div id="red"></div>
        <div id="green"></div>
        <div id="blue"></div>
        <p>
          <br><br><br><br><br><br><br><br><br><br>
          The diffuse color of a material will be interactively changed.
          A JavaScript <a href="https://jqueryui.com/slider/#colorpicker target=" _blank"> RGB color picker </a> is used
          and modified.
          If the RGB color value is changed, the diffuse material of the sphere shall be changed as well. So we need to
          get the Material node first.
          This is done by the getElementById function in X3DOM. Of course, the Material node needs to have an unique id.
        <pre>
	&lt;X3D id="shapedata" width="600px" height="600px" style="float:left"&gt;
	  &lt;Scene&gt;
	    &lt;Shape&gt; 
   	      &lt;Appearance&gt;
     	        &lt;Material id="material" diffuseColor="0.980, 0.502, 0.447"&gt; &lt;/Material&gt;
   	      &lt;/Appearance&gt;
	      &lt;Sphere radius="2.0"&gt; &lt;/Sphere&gt;
 	    &lt;/Shape&gt;
	  &lt;/Scene&gt;
	&lt;/X3D&gt;
    </pre>
        <br>
        For example, if the diffuse color should be set to red, the Material node is referenced by its id and the
        attribute diffuseColor is set to
        "1.0 0.0 0.0". The attribute value is always a string.
        <pre>
    var mat = document.getElementById("material");
    mat.setAttribute("diffuseColor", "1.0 0.0 0.0");      
    </pre>
        In the example, the RGB value is fetched from the slider. As the slider gives the RGB values between 0 and 255,
        they have to be transformed to
        arithmetic values between 0.0 and 1.0. After that, the RBG value has to be formatted as string.
        <pre>
      var mat = document.getElementById("material");
      rgbstring = " "+ red/255 + " " + green/255 + " " + blue/255;
      mat.setAttribute("diffuseColor", rgbstring);
    </pre>
      </td>
    </tr>
  </table>
  <script type="text/javascript" src="x3dom.js"></script>
  <script>
    function refreshDiffuseMaterial() {
      var red = $("#red").slider("value"),
        green = $("#green").slider("value"),
        blue = $("#blue").slider("value");
      var mat = document.getElementById("material");
      rgbstring = " " + red / 255 + " " + green / 255 + " " + blue / 255;
      mat.setAttribute("diffuseColor", rgbstring);
    }
    $(function () {
      $("#red, #green, #blue").slider({
        orientation: "horizontal",
        range: "min",
        max: 255,
        value: 127,
        slide: refreshDiffuseMaterial,
        change: refreshDiffuseMaterial
      });
      $("#red").slider("value", 255);
      $("#green").slider("value", 140);
      $("#blue").slider("value", 60);
    });
  </script>
</body>

</html>