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

Demonstrating translation, rotation, and scaling

These three 2D transformation techniques are quite useful:

  • Translation means changing the position of the origin (0,0) of the context

  • Rotation means moving the context by a particular angle

  • Scaling means changing the size of the drawing along the x axis and/or along the y axis

All three techniques are demonstrated in our new recipe whose output looks like this:

How to do it…

The following code does the job.

The HTML code:

<title>Translate, rotate and scale</title>
<script src="TRS.js"></script>
<body onload="drawTRS();">
<table border="1" align="center" bgcolor="lightyellow">
  <caption><b>Translation, Rotation and Scaling</b></caption>
<td><canvas id="can0" width="300" height="200"></canvas><br/>
<b><label id="lbl0"></label></b>

<td><canvas id="can1" width="300" height...