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https://github.com/upsetjs/chartjs-chart-venn

Chart.js Venn and Euler Diagrams
https://github.com/upsetjs/chartjs-chart-venn

chartjs chartjs-plugin euler euler-diagram set-theory venn-diagram venndiagram

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Chart.js Venn and Euler Diagrams

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# Chart.js Venn and Euler Diagram Chart



[![NPM Package][npm-image]][npm-url] [![Github Actions][github-actions-image]][github-actions-url]



Chart.js module for charting venn diagrams with up to five sets. Adding new chart type: `venn` and `euler`.



![Sports Venn Diagram](https://user-images.githubusercontent.com/4129778/84571515-f32f9100-ad93-11ea-9354-039411eef43a.png)



![five sets](https://user-images.githubusercontent.com/4129778/86374498-eca28400-bc84-11ea-8494-ea7d9cd11781.png)



## Related Plugins



Check out also my other chart.js plugins:



- [chartjs-chart-boxplot](https://github.com/sgratzl/chartjs-chart-boxplot) for rendering boxplots and violin plots

- [chartjs-chart-error-bars](https://github.com/sgratzl/chartjs-chart-error-bars) for rendering errors bars to bars and line charts

- [chartjs-chart-geo](https://github.com/sgratzl/chartjs-chart-geo) for rendering map, bubble maps, and choropleth charts

- [chartjs-chart-graph](https://github.com/sgratzl/chartjs-chart-graph) for rendering graphs, trees, and networks

- [chartjs-chart-pcp](https://github.com/sgratzl/chartjs-chart-pcp) for rendering parallel coordinate plots

- [chartjs-chart-wordcloud](https://github.com/sgratzl/chartjs-chart-wordcloud) for rendering word clouds

- [chartjs-plugin-hierarchical](https://github.com/sgratzl/chartjs-plugin-hierarchical) for rendering hierarchical categorical axes which can be expanded and collapsed



## Install



```bash

npm install --save chart.js chartjs-chart-venn

```



## Usage



see [Examples](https://upset.js.org/chartjs-chart-venn/examples/)



or at this [![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/ExPyZjG)



## Venn Diagram



### Data Structure



```ts

const config = {

  type: 'venn',

  data: ChartVenn.extractSets(

    [

      { label: 'Soccer', values: ['alex', 'casey', 'drew', 'hunter'] },

      { label: 'Tennis', values: ['casey', 'drew', 'jade'] },

      { label: 'Volleyball', values: ['drew', 'glen', 'jade'] },

    ],

    {

      label: 'Sports',

    }

  ),

  options: {},

};

```



Alternative data structure



```ts

const config = {

  type: 'venn',

  data: {

    labels: [

      'Soccer',

      'Tennis',

      'Volleyball',

      'Soccer ∩ Tennis',

      'Soccer ∩ Volleyball',

      'Tennis ∩ Volleyball',

      'Soccer ∩ Tennis ∩ Volleyball',

    ],

    datasets: [

      {

        label: 'Sports',

        data: [

          { sets: ['Soccer'], value: 2 },

          { sets: ['Tennis'], value: 0 },

          { sets: ['Volleyball'], value: 1 },

          { sets: ['Soccer', 'Tennis'], value: 1 },

          { sets: ['Soccer', 'Volleyball'], value: 0 },

          { sets: ['Tennis', 'Volleyball'], value: 1 },

          { sets: ['Soccer', 'Tennis', 'Volleyball'], value: 1 },

        ],

      },

    ],

  },

  options: {},

};

```



### Styling of elements



`ArcSlice` elements have the basic `backgroundColor`, `borderColor`, and `borderWidth` properties similar to a regular rectangle.



### Styling of labels



The `x` scale _ticks_ options are used to configure the _set value_ labels within the intersections.

The `y` scale _ticks_ options are used to configure the _set label_ labels next ot the set circles.

Changing the tick display options (e.g. `scales.x.ticks.display = false`) will disable the set value labels.

Similarly, its font spec and color are used to the styling of the labels.



## Euler Diagram



Euler diagrams are relaxed proportional venn diagrams such that the area of the circles and overlap try to fit the overlapping value.

It is a relaxed in a way that is just approximates the proportions using a numerical optimization process.

Moreover, only one and two set overlaps are used for the computation.

The library uses [venn.js](https://github.com/upsetjs/venn.js) in the background.



### Data Structure



```ts

const config = {

  type: 'euler',

  data: ChartVenn.extractSets(

    [

      { label: 'A', values: [1, 2, 3, 4, 11, 12, 13, 14, 15, 16, 17, 18] },

      { label: 'B', values: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20, 21, 22, 23] },

      { label: 'C', values: [1, 11, 12, 4, 5, 24, 25, 26, 27, 28, 29, 30] },

    ],

    {

      label: 'Sets',

    }

  ),

  options: {},

};

```



### Styling of elements



see Venn Diagram



## ESM and Tree Shaking



The ESM build of the library supports tree shaking thus having no side effects. As a consequence the chart.js library won't be automatically manipulated nor new controllers automatically registered. One has to manually import and register them.



Variant A:



```js

import { Chart, LinearScale } from 'chart.js';

import { VennDiagramController, ArcSlice } from 'chartjs-chart-venn';



Chart.register(VennDiagramController, ArcSlice, LinearScale);

...



new Chart(ctx, {

  type: VennDiagramController.id,

  data: [...],

});

```



Variant B:



```js

import { VennDiagramChart } from 'chartjs-chart-venn';



new VennDiagramChart(ctx, {

  data: [...],

});

```



## Development Environment



```sh

npm i -g yarn

yarn install

yarn sdks vscode

```



### Common commands



```sh

yarn compile

yarn test

yarn lint

yarn fix

yarn build

yarn docs

```



[mit-image]: https://img.shields.io/badge/License-MIT-yellow.svg

[mit-url]: https://opensource.org/licenses/MIT

[npm-image]: https://badge.fury.io/js/chartjs-chart-venn.svg

[npm-url]: https://npmjs.org/package/chartjs-chart-venn

[github-actions-image]: https://github.com/upsetjs/chartjs-chart-venn/workflows/ci/badge.svg

[github-actions-url]: https://github.com/upsetjs/chartjs-chart-venn/actions

[codepen]: https://img.shields.io/badge/CodePen-open-blue?logo=codepen