Book Image

Canvas Cookbook

Book Image

Canvas Cookbook

Overview of this book

With the growing popularity of HTML5 Canvas, this book offers tailored recipes to help you develop portable applications, presentations, and games. The recipes are simple yet creative and build on each other. At every step, the book inspires the reader to develop his/her own recipe. From basic to advanced, every aspect of Canvas API has been covered to guide readers to develop their own application, presentation, or game.
Table of Contents (16 chapters)
Canvas Cookbook
About the Author
About the Reviewer

Combining events and animation

This is one of the simplest possible games to start with. It's a recipe that combines events with animation. The output is as follows:

How to do it

The recipe is as follows:

The HTML code:

  <title>Event Handling example</title>
  <script src="simplegame.js"></script>
<body onload=animate()>
  <h1>Score Area</h1>
  <canvas width="300" height="100" id="MyScoreArea" style="border:2px solid green;" tabindex="0">
    Canvas tag is not supported by your browser
  <h1>click the yellow circle to score</h1>
  <canvas style="background-image:-webkit-canvas(mask);" width="800" height="500" id="MyCanvasArea" style="border:2px solid blue;" tabindex="0">
    Canvas tag is not supported by your browser

The JavaScript code:

var can;
var ctx;
var isAnimating=true;
var cd;
var flag=1;
var cd;