条形图(图表.js）中的附加线条

Additional line in BarChart (Charts.js)

本文关键字：加线条 图表 js 条形图      更新时间：2023-09-26

我正在尝试通过以下代码生成的条形图添加一条水平线（例如计算的平均值）。有没有办法用另一个画布覆盖该条形图？还是我必须更改"图表.js"文件才能获得这样的线条？如果这是必要的，必须改变什么？

<!doctype html>
<html>
  <head>
    <script src="Chart.js"></script>
  </head>
  <body>
    <center>
    <h2>
    <u>Statistik</u>
    </h2>
    <canvas id="canvas" height="450" width="600"></canvas>
    <script>
        var jan = 12
        var feb = 23;
        var mar = 11;
        var apr = 65;
        var mai = 33;
        var jun = 1;
        var jul = 23;
        var aug = 0;
        var sep =0;
        var okt = 0;
        var nov =0;
        var dec = 0;
        var barChartData = {
            labels : ["Januar","Februar","März","April","Mai","Juni","Juli", "August", "September", "Oktober", "November", "Dezember"],
            datasets : [
            {
                label : "2014",
                fillColor: "rgba(220,220,220,0.5)",
                strokeColor: "rgba(220,220,220,0.8)",
                highlightFill: "rgba(220,220,220,0.75)",
                highlightStroke: "rgba(220,220,220,1)",
                data : [12,0,0,0,0,0,0,0,0,0,0,0]
            }, 
            {
                label : "2015",
                fillColor : "rgba(151,187,205,0.5)",
                strokeColor : "rgba(151,187,205,0.8)",
                highlightFill : "rgba(151,187,205,0.75)",
                highlightStroke : "rgba(151,187,205,1)",
                data : [jan,feb,mar,apr,mai,jun,jul,aug,sep,okt,nov,dec]
            }]
        }
        var ctx = document.getElementById("canvas").getContext("2d");
        var chart = new Chart(ctx).Bar(barChartData, {
            responsive : true
        });
    </script>
  </body>
</html>

感谢您的帮助！

亲切问候冯吉索

我创建了一个叫做叠加图的东西，我已将其添加到我的图表分支中.js （https://github.com/leighquince/Chart.js），可以在这种情况下使用。 它的工作方式与折线图或条形图相同，唯一的区别是您声明了一个名为 type 的额外属性，该属性可以是'line'的，也可以是'bar'的。然后打电话new Chart(ctx).Overlay(data)

更新：现在还添加到分叉中，可以选择传递一个名为堆叠overlayBars的选项（将名称从堆叠更改为堆叠，因为它正在做的事情有点误导），该选项将相互叠加条形图。

var data = {
  labels: ["January", "February", "March", "April", "May", "June", "July"],
  datasets: [{
    label: "My First dataset",
    //new option, barline will default to bar as that what is used to create the scale
    type: "line",
    fillColor: "rgba(120,120,120,0.2)",
    strokeColor: "rgba(120,120,120,1)",
    pointColor: "rgba(120,120,120,1)",
    pointStrokeColor: "#fff",
    pointHighlightFill: "#fff",
    pointHighlightStroke: "rgba(220,220,220,1)",
    data: [65, 59, 4, 81, 56, 55, 40]
  }, {
    label: "My First dataset",
    //new option, barline will default to bar as that what is used to create the scale
    type: "bar",
    fillColor: "rgba(220,20,220,1)",
    strokeColor: "rgba(220,20,220,1)",
    pointColor: "rgba(220,20,220,1)",
    pointStrokeColor: "#fff",
    pointHighlightFill: "#fff",
    pointHighlightStroke: "rgba(220,220,220,1)",
    data: [32, 25, 33, 88, 12, 92, 33]
  }, {
    label: "My Second dataset",
    //new option, barline will default to bar as that what is used to create the scale
    type: "bar",
    fillColor: "rgba(30,30,130,1)",
    strokeColor: "rgba(30,30,130,1)",
    pointColor: "rgba(30,30,130,1)",
    pointStrokeColor: "#fff",
    data: [13, 29, 22, 44, 34, 77, 10]
  }]
};
var ctx = document.getElementById("canvas").getContext("2d");
var chart = new Chart(ctx).Overlay(data, {
  responsive: false,
  overlayBars: true,
  datasetFill: false,
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://www.quincewebdesign.com/cdn/Chart.js"></script>
<canvas id="canvas" width="400"></canvas>

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