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

Animating a rain effect

Rain is a very common but good-to-see animation. In this recipe, the droplets are small lines.

The output looks like this:

How to do it…

The recipe is as follows:

The HTML code:

<title>The Rain</title>
<script src="rain.js"></script>
<body onload="init();">
<canvas id="MyCanvasArea" width="800" height="500" style="border:2px solid blue;" >
   your browser does not support canvas

The JavaScript code:

var can;
var ctx;
var raindrops=[];
var raindrop;
var part;
var numraindrops=50;
var i;
var bounce=-1;
var r,g,b;

function animate()
  reqAnimFrame = window.mozRequestAnimationFrame    ||
                window.webkitRequestAnimationFrame ||
                window.msRequestAnimationFrame     ||