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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

Drawing a line graph


Graphs are always informative. The basic graphical representation can be a line graph, which is demonstrated here:

How to do it…

The HTML code is as follows:

<html>
<head>
  <title>A simple Line chart</title>
  <script src="linechart.js"></script>
</head>
<body onload=init()>
  <h1>Your WhatsApp Usage</h1>
  <canvas width="600" height="500" id="MyCanvasArea" style="border:2px solid blue;" tabindex="0">
    Canvas tag is not supported by your browser
  </canvas>
</body>
</html>

The JavaScript code is as follows:

function init() {
  var gCanvas = document.getElementById('MyCanvasArea');
  // Ensure that the element is available within the DOM
  var ctx = gCanvas.getContext('2d');
  // Bar chart data
  var data = new Array(7);
  data[0] = "1,130";    data[1] = "2,140";    data[2] = "3,150";    data[3] = "4,140";
  data[4] = "5,180";  data[5] = "6,240";  data[6] = "7,340";
  // Draw the bar chart...
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