chartjs-plugin-colorschemes

Predefined color schemes for Chart.js

You can pick the perfect color combination for your charts from the predefined color schemes, which are based on popular tools such as ColorBrewer, Microsoft Office and Tableau.

This plugin requires Chart.js 2.5.0 or later.

Installation

You can download the latest version of chartjs-plugin-colorschemes from the GitHub releases.

To install via npm:

1npm install chartjs-plugin-colorschemes --save

To install via bower:

1bower install chartjs-plugin-colorschemes --save

To use CDN:

1<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-colorschemes"></script>

1<script src="https://unpkg.com/chartjs-plugin-colorschemes"></script>

Usage

chartjs-plugin-colorschemes can be used with ES6 modules, plain JavaScript and module loaders.

Include Chart.js and chartjs-plugin-colorschemes.js to your page, and specify a color scheme as shown in the example below. You can pick a scheme from Color Chart.

1    options: {
2        plugins: {
3            colorschemes: {
4                scheme: 'brewer.Paired12'
5            }
6        }
7    }

Every color scheme has a number at the end of its name, which indicates the number of that colors included in the scheme. If the number of the datasets is larger than it, the same colors will appear repeatedly. A color is not modified if it is specified by dataset options.

Usage in ES6 as Module

Nothing else than importing the module should be enough.

1import 'chartjs-plugin-colorschemes';

If you want to reduce the size by only importing the plugin core and particular color schemes, see the example below.

1// import the plugin core
2import 'chartjs-plugin-colorschemes/src/plugins/plugin.colorschemes';
3
4// import a particular color scheme
5import { Aspect6 } from 'chartjs-plugin-colorschemes/src/colorschemes/colorschemes.office';
6
7// ...

8    options: {

9        plugins: {

10            colorschemes: {

11                scheme: Aspect6
12            }
13        }
14    }
15//...

Tutorial

You can find a tutorial at nagix.github.io/chartjs-plugin-colorschemes.

Configuration

The plugin options can be changed at 2 different levels and with the following priority:

• per chart: options.plugins.colorschemes.*
• globally: Chart.defaults.global.plugins.colorschemes.*

All available options are listed below.

Name	Type	Default	Description
fillAlpha	number	0.5	The transparency value for the line fill color. Must be a number between 0.0 (fully transparent) and 1.0 (no transparency).
scheme	string|string[]	'brewer.Paired12'	Color scheme name that is any of Color Chart. It also accepts an array of color strings, which is primarily for ES modules. more...
reverse	boolean	false	If set to true, the order of the colors in the selected scheme is reversed.
overrideExisting	boolean	false	If set to true, the specified color scheme will override the existing color options. If false, it is only applied when no color setting exists. more...
custom	function	undefined	A function that takes a copy of the color string array for scheme in order to extend the predefined scheme colors. more...

Overriding Existing Color Settings

By default, this plugin doesn't apply a color scheme if any color options are already specified. This may cause a problem if you are using a third party library such as ng-charts, which automatically applies default color settings. In that case, the existing color settings can be overridden by setting the overrideExisting option to true.

custom-Function

With the help of the custom-Function you can extend the predefined scheme colors. This function takes a copy of the current scheme and is expected to return an array with at least one element. See the example below.

1var customColorFunction = function(schemeColors) {
2    var myColors = ['#ff0000', '#00ff00', '#0000ff']; // define/generate own colors
3
4    // extend the color scheme with own colors
5    Array.prototype.push.apply(schemeColors, myColors);
6
7    return schemeColors; // optional: this is not needed if the array is modified in place
8};
9
10// ...
11    options: {
12        plugins: {
13            colorschemes: {
14                scheme: 'brewer.Paired12',
15                custom: customColorFunction
16            }
17        }
18    }
19//...
20

custom colorscheme from scratch

It is possible to build your custom colorscheme from scratch (without using the custom function) by simply defining the colors it contains. See example below.

1var myColors = ['red', 'green', 'blue', 'orange', 'black', 'yellow'];
2
3// ...
4    options: {
5        plugins: {
6            colorschemes: {
7                scheme: myColors
8            }
9        }
10    }
11//...
12

Building

You first need to install node dependencies (requires Node.js):

1npm install

The following commands will then be available from the repository root:

1gulp build            # build dist files
2gulp build --watch    # build and watch for changes
3gulp test             # run all tests
4gulp test --watch     # run all tests and watch for changes
5gulp test --coverage  # run all tests and generate code coverage
6gulp lint             # perform code linting
7gulp package          # create an archive with dist files and samples

License

chartjs-plugin-colorschemes is available under the MIT license.