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Chart.js module for charting graphs
# Chart.js Graphs
[![NPM Package][npm-image]][npm-url] [![Github Actions][github-actions-image]][github-actions-url]
Chart.js module for charting graphs. Adding new chart types: `graph`, `forceDirectedGraph`, `dendrogram`, and `tree`.
Works great with https://github.com/chartjs/chartjs-plugin-datalabels or https://github.com/chrispahm/chartjs-plugin-dragdata
[![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/vYNVbgd)
## 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-pcp](https://github.com/sgratzl/chartjs-chart-pcp) for rendering parallel coordinate plots
- [chartjs-chart-venn](https://github.com/sgratzl/chartjs-chart-venn) for rendering venn and euler diagrams
- [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-graph
```
## Usage
see [Examples](https://www.sgratzl.com/chartjs-chart-graph/examples/)
CodePens
- [Force Directed Layout](https://codepen.io/sgratzl/pen/mdezvmL)
- [Tree Layouts](https://codepen.io/sgratzl/pen/jObedwg)
- [Tree With Data Labels](https://codepen.io/sgratzl/pen/vYNVbgd)
## Graphviz Dot File Parsing
A Graphviz Dot File parsing package is located at https://github.com/sgratzl/chartjs-chart-graph-dot-parser.
It creates compatible data structures to be consumed by this plugin.
## Styling
The new chart types are based on the existing `line` controller. Tho, instead of showing a line per dataset it shows edges as lines. Therefore, the styling options for points and lines are the same. See also https://www.chartjs.org/docs/latest/charts/line.html. However, to avoid confusion, the line options have a default `line` prefix, e..g `lineBorderColor` to specify the edge border color and `pointBorderColor` to specify the node border color.
## Data Structure
```js
data: {
labels: ['A', 'B', 'C'], // node labels
datasets: [{
data: [ // nodes as objects
{ x: 1, y: 2 }, // x, y will be set by the force directed graph and can be omitted
{ x: 3, y: 1 },
{ x: 5, y: 3 }
],
edges: [ // edge list where source/target refers to the node index
{ source: 0, target: 1},
{ source: 0, target: 2}
]
}]
},
```
Alternative structure for trees
```js
data: {
labels: ['A', 'B', 'C'], // node labels
datasets: [{
data: [ // nodes as objects
{ x: 1, y: 2 }, // x, y will be set by the force directed graph and can be omitted
{ x: 3, y: 1, parent: 0 },
{ x: 5, y: 3, parent: 0 }
]
}]
},
```
## Force Directed Graph
chart type: `forceDirectedGraph`
Computes the x,y position of nodes based on a force simulation. It is based on https://github.com/d3/d3-force/.
[![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/mdezvmL)
### Options
## Dendrogram, Tree
chart types: `dendrogram`, `tree`
The tree and dendrograms layouts are based on https://github.com/d3/d3-hierarchy.
**Dendrogram Horizontal**
[![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/jObedwg)
**Dendrogram Vertical**
[![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/jObedwg)
**Dendrogram Radial**
[![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/jObedwg)
**Tidy Tree Horizontal**
[![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/jObedwg)
**Tidy Tree Vertical**
[![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/jObedwg)
**Tidy Tree Radial**
[![Open in CodePen][codepen]](https://codepen.io/sgratzl/pen/jObedwg)
### Options
### 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, PointElement } from 'chart.js';
import { ForceDirectedGraphController, EdgeLine } from 'chartjs-chart-graph';
// register controller in chart.js and ensure the defaults are set
Chart.register(ForceDirectedGraphController, EdgeLine, LinearScale, PointElement);
...
new Chart(ctx, {
type: ForceDirectedGraphController.id,
data: [...],
});
```
Variant B:
```js
import { ForceDirectedGraphChart } from 'chartjs-chart-graph';
new ForceDirectedGraphChart(ctx, {
data: [...],
});
```
## Development Environment
```sh
npm i -g yarn
yarn install
yarn sdks vscode
```
### Building
```sh
yarn install
yarn build
```
[npm-image]: https://badge.fury.io/js/chartjs-chart-graph.svg
[npm-url]: https://npmjs.org/package/chartjs-chart-graph
[github-actions-image]: https://github.com/sgratzl/chartjs-chart-graph/workflows/ci/badge.svg
[github-actions-url]: https://github.com/sgratzl/chartjs-chart-graph/actions
[codepen]: https://img.shields.io/badge/CodePen-open-blue?logo=codepen
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