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 particle fountain

The particles in the previous recipe originate randomly and then move randomly. In this recipe, with a small change, we can give it a fountain effect. This is achieved by changing the origin of all the particles to a single point. One more change is done in the recipe by drawing a barrel. The output of the recipe is shown here:

How to do it…

The recipe goes as follows:

The HTML code:

<title>Particle demo</title>
<script src="ParticleFountain.js"></script>
<body onload="init();">
<canvas id="MyCanvasArea" width="800" height="500" style="border:2px solid blue;" >
   your browser does not support canvas
<h1>Particle Demo</h1>

The JavaScript code:

var can;
var ctx;
var particles=[];
var particle;
var part;
var numParticles=100;
var i;
var bounce=-1;
var r,g,b;
var gravity=0.4;

function animate()