Display line chart with connected dots using chart

Question

I want to draw a chart like this using ChartJS. But I couldn't find a solution for connect first and last dots and show single unique dot inside that connected area. And also I need to style each dot with different colors. I tried exploring ChartJS documentation but couldn't find a solution. Is there any chart drawing library which has these features or how to do this with ChartJS?

Answer 1

You can create a scatter chart instead of line.

Here is an example :
^{( tried to replicate your given image amap )}

var chart = new Chart(ctx, {
   type: 'scatter',
   data: {
      datasets: [{
         data: [{
            x: 1,
            y: 1
         }, {
            x: 3,
            y: 7
         }, {
            x: 6,
            y: 5
         }, { // add same data as the first one, to draw the closing line
            x: 1,
            y: 1
         }],
         borderColor: 'black',
         borderWidth: 1,
         pointBackgroundColor: ['#000', '#00bcd6', '#d300d6'],
         pointBorderColor: ['#000', '#00bcd6', '#d300d6'],
         pointRadius: 5,
         pointHoverRadius: 5,
         fill: false,
         tension: 0,
         showLine: true
      }, {
         data: [{
            x: 3.5,
            y: 4.5
         }],
         pointBackgroundColor: 'orange',
         pointBorderColor: 'darkorange',
         pointRadius: 10,
         pointHoverRadius: 10
      }]
   },
   options: {
      legend: false,
      tooltips: false,
      scales: {
         xAxes: [{
            ticks: {
               min: 0,
               max: 10
            },
            gridLines: {
               color: '#888',
               drawOnChartArea: false
            }
         }],
         yAxes: [{
            ticks: {
               min: 0,
               max: 8,
               padding: 10
            },
            gridLines: {
               color: '#888',
               drawOnChartArea: false
            }
         }]
      }
   }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.min.js"></script>
<canvas id="ctx"></canvas>

^{note : this is just an example, and you can customize it further to fit your need, following the official documentation.}