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<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Getting Started with Chart JS with www.chartjs3.com</title>
 
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.8.0/chart.min.js"></script>
</head>

<body>
  <div class="chartMenu">
    <p>WWW.CHARTJS3.COM (Chart JS 3.8.0)</p>
  </div>
  <div class="chartCard">
    <div class="chartBox">
      <canvas id="myChart"></canvas>
    </div>
  </div>
</body>

</html>

<script>
    // setup
const data = {
  labels: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun","Sun"],
  datasets: [
    {
      data: [1, 2, 3, 4, 5, 6,7,8],
      backgroundColor: [
        "#316065",
        "#1A7F89",
        "#2D9CA7",
        "#2D86A7",
        "#1167A7",
        "#142440",
        "#142460",
        "#142470"
      ],
      borderColor: [
        "#316065",
        "#1A7F89",
        "#2D9CA7",
        "#2D86A7",
        "#1167A7",
        "#142440",
        "#142460",
        "#142470",
      ]
    }
  ]
};

// pieLabelsLine plugin
const pieLabelsLine = {
  id: "pieLabelsLine",
  afterDraw(chart) {
    const {
      ctx,
      chartArea: { width, height }
    } = chart;

    const cx = chart._metasets[0].data[0].x;
    const cy = chart._metasets[0].data[0].y;

    const sum = chart.data.datasets[0].data.reduce((a, b) => a + b, 0);

    chart.data.datasets.forEach((dataset, i) => {
      chart.getDatasetMeta(i).data.forEach((datapoint, index) => {
        const { x: a, y: b } = datapoint.tooltipPosition();

        const x = 2 * a - cx;
        const y = 2 * b - cy;

        // draw line
        const halfwidth = width / 2;
        const halfheight = height / 2;
        const xLine = x >= halfwidth ? x + 20 : x - 20;
        const yLine = y >= halfheight ? y + 20 : y - 20;

        const extraLine = x >= halfwidth ? 10 : -10;

        ctx.beginPath();
        ctx.moveTo(x, y);
        ctx.arc(x, y, 2, 0, 2 * Math.PI, true);
        ctx.fill();
        ctx.moveTo(x, y);
        ctx.lineTo(xLine, yLine);
        ctx.lineTo(xLine + extraLine, yLine);
        // ctx.strokeStyle = dataset.backgroundColor[index];
        ctx.strokeStyle = "black";
        ctx.stroke();

        // text
        const textWidth = ctx.measureText(chart.data.labels[index]).width;
        ctx.font = "12px Arial";
        // control the position
        const textXPosition = x >= halfwidth ? "left" : "right";
        const plusFivePx = x >= halfwidth ? 5 : -5;
        ctx.textAlign = textXPosition;
        ctx.textBaseline = "middle";
        // ctx.fillStyle = dataset.backgroundColor[index];
        ctx.fillStyle = "black";

        ctx.fillText(
          chart.data.labels[index],
          xLine + extraLine + plusFivePx,
          yLine
        );
      });
    });
  }
};
// config
const config = {
  type: "pie",
  data,
  options: {
    maintainAspectRatio: false,
    layout: {
      padding: 30
    },
    scales: {
      y: {
        display: false,
        beginAtZero: true,
        ticks: {
          display: false
        },
        grid: {
          display: false
        }
      },
      x: {
        display: false,
        ticks: {
          display: false
        },
        grid: {
          display: false
        }
      }
    },
    plugins: {
      legend: {
        display: false
      }
    }
  },
  plugins: [pieLabelsLine]
};

// render init block
const myChart = new Chart(document.getElementById("myChart"),config);

    </script>