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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
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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

Drawing gradients

Here we implement some effects. Applying a gradient is quite a colorful activity. The output of our recipe demonstrating gradients looks like this:

Drawing gradients

How to do it…

The recipe uses four new methods, namely createRadialGradient(), createLinearGradient(), addColorStop(), and rgb(). The recipe is as follows.

The HTML code:

<html>
<head>
<title>Gradients</title>
<script src="gradients.js"></script>
</head>
<body onload="init()">
<canvas id="MyCanvasArea" width="500" height="200" style="border:2px solid blue;" >
your browser does not support canvas</canvas>
<h1>Radial and Linear Gradient</h1>
</body>
</html>

The JavaScript code:

function init()
{
  var can=document.getElementById("MyCanvasArea");
  var ctx=can.getContext("2d");     

  //coordinates of center of 1st circle and a radius  
  var x1 = 100;   // x of 1...
You have been reading a chapter from
Canvas Cookbook
Published in: May 2019
Publisher:
ISBN-13: 9781785284892
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