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

Clipping a path

Clipping an image is the concept of picking a part of the image. The part can be of any shape. In this recipe, I am using a circle. The output of the recipe is as shown here:

How to do it

The following is the code for the recipe:

The HTML code:

<script src="Clipping.js"></script>
<body onload="init();">
<canvas id="MyCanvasArea" width="500" height="500" style="border:2px solid blue;" >your browser does not support canvas</canvas>

The JavaScript code:

var can;
var ctx;
var boyimage;
var x,y;
var imageData;
var imgPixels;
var clipX,clipY,radius;

function init()
  can = document.getElementById('MyCanvasArea'),
  ctx = can.getContext('2d');
  var imageObj=new Image();