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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 FREE CHAPTER 2. Shapes and Composites 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

Drawing rectangles


There are three different functions in the canvas API to draw rectangles. They are:

  • rect(xPos,yPos,width,height)

  • fillRect(xPos,yPos,width,height)

  • strokeRect(xPos,yPos,width,height)

Let's see these all together in a single recipe. So here is the output of our first recipe:

How to do it…

The output that shows three different rectangles, uses a call to three different functions, which are explained further. The recipe is as follows.

An HTML file that includes the canvas element:

<html>
<head>
<title>Rectangles</title>
<script src="Rectangles.js"></script>
</head>
<body onload="init()" bgcolor="#FFFFCC">
<canvas id="canvas" width="250" height="200" style="border:2px solid blue;" >
  your browser does not support canvas
</canvas>
<H1>Rectangles</H1>
</body>
</html>

The JavaScript file as mentioned in the <script> tag in the previously given code:

function init()
{
  var canvas = document.getElementById...
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