Thursday, June 6, 2013

HTML5 Canvas Example

To show how to put the Canvas element to work, we’re going to create an example named canvas.html, which you can see running in Firefox in Figure



Canvas example
Canvas example
To get started with the canvas.html example, follow these steps:

  1. Create canvas.html using a text editor such as Windows WordPad .
  2. Enter the following code to create the <canvas> element and to set up the JavaScript. Note that we’re going to put our JavaScript in a function named loader, which is run only after the Canvas element is fully loaded by the browser:

    <!DOCTYPE html>
      <html>
        <head>

          <title>
            Canvas Example
          </title>
          <script type=”text/javascript”>
            function loader()
              {
              }

         </script>
      </head>

      <body onload=”loader()”>
        <h1>Canvas Example</h1>
        <canvas id=”canvas” width=”600”
        height=”500”>
        </canvas>
      </body>
    </html>
  3. Add the JavaScript to create an object corresponding to the Canvas element as shown. We’ll use this object to access the Canvas element in JavaScript.

    <!DOCTYPE html>
      <html>
          <head>
              <title>
                Canvas Example
                  </title>
                    <script type=”text/javascript”>
                        function loader()
                          {
                              var canvas = document.getElementById
                                (‘canvas’);
                                  var canvas1 = canvas.getContext(‘2d’); .
                                  </script>
                                  </head>
                                    <body onload=”loader()”>
                                        <h1>Canvas Example</h1>
                                        <canvas id=”canvas” width=”600”
                                         height=”500”>
                                        </canvas>
                                      </body>
                                    </html>
                                  1. Save canvas.html. Make sure you save this code in text format.The default format for WordPad, for example, is RTF, rich-textformat, which won’t work with browsers.



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