https://www.datanormandie.fr/sites/default/files/api/portail_d4c/lib/chartjs-border/Plugin.Border.js

1(function (global, factory) {
2	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('chart.js')) :
3	typeof define === 'function' && define.amd ? define(['chart.js'], factory) :
4	(global.PluginBorder = factory(global.Chart));
5}(this, (function (Chart) { 'use strict';
6
7Chart = Chart && Chart.hasOwnProperty('default') ? Chart['default'] : Chart;
8
9var BorderPlugin = {
10  id: 'chartJsPluginBorder',
11
12  /**
13   * Plugin hook to draw the background
14   * @param chart chartjs instance
15   * @param options plugin options
16   */
17  beforeDraw(chart, args, options) {
18    if(options.borderWidth > 0){
19      const {ctx, chartArea: {left, top, right, bottom}} = chart;
20      
21      ctx.save();
22      ctx.strokeStyle = options.borderColor;
23      ctx.lineWidth = options.borderWidth;
24      ctx.setLineDash(options.borderDash || []);
25      ctx.lineDashOffset = options.borderDashOffset;
26  
27      // Calculate width
28      const width = right - left;
29      const height = bottom - top;
30  
31      ctx.strokeRect(left, top, width, height);
32      ctx.restore();
33    }
34  }
35};
36
37Chart.register(BorderPlugin);
38
39return BorderPlugin;
40
41})));