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Learn Chart.js

You're reading from   Learn Chart.js Create interactive visualizations for the Web with Chart.js 2

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Product type Paperback
Published in Feb 2019
Publisher
ISBN-13 9781789342482
Length 284 pages
Edition 1st Edition
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Author (1):
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Helder da Rocha Helder da Rocha
Author Profile Icon Helder da Rocha
Helder da Rocha
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Table of Contents (9) Chapters Close

Preface 1. Introduction FREE CHAPTER 2. Technology Fundamentals 3. Chart.js - Quick Start 4. Creating Charts 5. Scales and Grid Configuration 6. Configuring Styles and Interactivity 7. Advanced Chart.js 8. Other Books You May Enjoy

Patterns


Patterns are a great way to create charts that don't depend on color-coding, and they can be used in color or monochromatic devices or print media. And they are, of course, color-blind safe. You can create patterns using HTML Canvas commands somewhat similar to the ones used for gradients, but it's much easier to use a plugin, such as the Patternomaly plugin, listed in the Chart.js official documentation.

You can obtain Patternomaly by downloading the JavaScript library from its GitHub repository (github.com/ashiguruma/patternomaly) or by using a CDN link:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/patternomaly.min.js">
</script>

To generate a pattern, all you have to do is choose a color and call pattern.generate(), which will randomly select 1 of the 21 patterns available:

pattern.generate('rgb(50%,20%,10%');

You can also choose a specific pattern as the first argument of pattern.draw():

pattern.draw('triangle', 'lightblue');

A list of the supported...

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