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Canvas Cookbook

You're reading from   Canvas Cookbook Over 80 simple but creative and structured recipes to explore the capabilities of HTML5 Canvas

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Product type Paperback
Published in May 2019
Publisher
ISBN-13 9781785284892
Length 254 pages
Edition 1st Edition
Languages
Tools
Concepts
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Toc

Table of Contents (11) Chapters Close

Preface 1. Paths and Text 2. Shapes and Composites FREE CHAPTER 3. Animation 4. Images and Videos 5. Interactivity through Events 6. Creating Graphs and Charts 7. 3D Modeling 8. Game Development 9. Interoperability and Deployment Index

Animating a line


This animated line recipe shows a very basic animation, in which the line moves to and fro. The output of the recipe is shown here:

How to do it…

The actual output is a single canvas with the animated line. The previous image tries to help you visualize the frames in different stages of the animation. You need to try this example to get a feel. The code is given as follows:

The HTML code:

<html>
<head>
<title>A simple line animation</title>
<script src="LineAnimation.js"></script>
</head>
<body onload="init();">
<canvas id="MyCanvasArea" width="300" height="200" style="border:2px solid blue;" >
   your browser does not support canvas
</canvas>
<h1>An animated line</h1>
</body>
</html>

The JavaScript file, as mentioned in the <script> tag in the previous code:

var x =  0;
var y = 80;
var xEnd=200;
var goRight=true;
var canvas;
var context;
function animate() {   
reqAnimFrame = window.mozRequestAnimationFrame...
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