Chart.js - 同一画布上的多个甜甜圈图

2022-01-22 00:00:00 canvas charts jquery javascript chart.js

我试图通过在同一画布上多次初始化 Chart.js 来模拟多层圆环图.当时只有一张图表可见.当您将鼠标悬停在其位置时，另一个将可见......

I´m trying to simulate a multi layer doughnut chart by initializing Chart.js multiple times over same canvas. There is only one chart visible at the time. The other will be visible when you hover over its position…

有人知道如何让两者同时可见吗?

Does somebody know how to make both visible at the same time?

这是我的代码:

<!doctype html>
<html>
    <head>
        <title>Doughnut Chart</title>
        <script src="../Chart.js"></script>
        <style>
            body{
                padding: 0;
                margin: 0;
            }
            #canvas-holder-1{
              position: fixed;
              top: 50%;
              left: 50%;
              margin-top: -250px;
              margin-left: -250px;
            }
        </style>
    </head>
    <body>
        <div id="canvas-holder-1">
            <canvas id="chart-area" width="500" height="500"/>
        </div>
<script>

        var doughnutData = [
                {
                    value: 20,
                    color:"#F7464A",
                    highlight: "#FF5A5E",
                    label: "Red",
                },
                {
                    value: 50,
                    color: "#46BFBD",
                    highlight: "#5AD3D1",
                    label: "Green"
                },
                {
                    value: 30,
                    color: "#FDB45C",
                    highlight: "#FFC870",
                    label: "Yellow"
                },
                {
                    value: 40,
                    color: "#949FB1",
                    highlight: "#A8B3C5",
                    label: "Grey"
                },
                {
                    value: 120,
                    color: "#4D5360",
                    highlight: "#616774",
                    label: "Dark Grey"
                }

            ];
            var doughnutData2 = [
                {
                    value: 10,
                    color:"#F7464A",
                    highlight: "#FF5A5E",
                    label: "Red",
                },
                {
                    value: 100,
                    color: "#46BFBD",
                    highlight: "#5AD3D1",
                    label: "Green"
                },
                {
                    value: 20,
                    color: "#FDB45C",
                    highlight: "#FFC870",
                    label: "Yellow"
                },
                {
                    value: 60,
                    color: "#949FB1",
                    highlight: "#A8B3C5",
                    label: "Grey"
                },
                {
                    value: 120,
                    color: "#4D5360",
                    highlight: "#616774",
                    label: "Dark Grey"
                }

            ];

            window.onload = function(){
                var ctx = document.getElementById("chart-area").getContext("2d");
                window.myDoughnut = new Chart(ctx).Doughnut(doughnutData, {
                  responsive : false,
                  animateScale: false,
                  animateRotate:false,
                  animationEasing : "easeOutSine",
                  animationSteps : 80,
                  percentageInnerCutout : 90,
                });
              myDoughnut.outerRadius= 200;
                window.myDoughnut2 = new Chart(ctx).Doughnut(doughnutData2, {
                  responsive : false,
                  animateScale: false,
                  animateRotate:false,
                  animationEasing : "easeOutSine",
                  animationSteps : 80,
                  percentageInnerCutout : 90
                                  });
            };



    </script>
    </body>
</html>

谢谢，乔辰

推荐答案

您可以使用多个数据集，查看 Chart JS 演示页面:

You can use multiple datasets, checkout the Chart JS demo page:

http://www.chartjs.org/samples/latest/charts/甜甜圈.html

此外，这里还有一个包含多个数据集和多个标签的示例:

Also, here is an example with multiple datasets and multiple labels too:

https://jsfiddle.net/moe2ggrd/1/

重要的部分:

  ...
  var myChart = new Chart(ctx, {
    type: 'doughnut',
    data: {
      labels: ["Green", "Yellow", "Red", "Purple", "Blue"],
      datasets: [{
        data: [1, 2, 3, 4, 5],
        backgroundColor: [
          'green',
          'yellow',
          'red',
          'purple',
          'blue',
        ],
        labels: [
          'green',
          'yellow',
          'red',
          'purple',
          'blue',
        ]
      }, {
        data: [6, 7, 8],
        backgroundColor: [
          'black',
          'grey',
          'lightgrey'
        ],
        labels: [
          'black',
          'grey',
          'lightgrey'
        ],
      }, ]
    },
    ...

希望它对尝试做同样事情的人有所帮助.

Hope it helps someone who's trying to do the same thing.

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