问题描述

有许多扩展图表以包含水平和垂直线的示例.但是，我还没有找到用水平条形图绘制垂直线的方法.

1. 解决方案

   ChartJS 支持自定义插件.创建一个插件，该插件将从图表选项中读取新属性并在指定索引处绘制线条.

   在 Plunkr 上查看

   //创建插件var originalLineDraw = Chart.controllers.horizo​​ntalBar.prototype.draw;Chart.helpers.extend(Chart.controllers.horizo​​ntalBar.prototype, {画:函数(){originalLineDraw.apply(this, arguments);var 图表 = this.chart;var ctx = 图表.chart.ctx;var index = chart.config.options.lineAtIndex;如果(索引){var xaxis = chart.scales['x-axis-0'];var yaxis = chart.scales['y-axis-0'];var x1 = xaxis.getPixelForValue(index);var y1 = yaxis.top;var x2 = xaxis.getPixelForValue(index);var y2 = yaxis.bottom;ctx.save();ctx.beginPath();ctx.moveTo(x1, y1);ctx.strokeStyle = '红色';ctx.lineTo(x2, y2);ctx.stroke();ctx.restore();}}});//设置图表数据变量数据 = {标签:[一月"，二月"，三月"，四月"，五月"，六月"，七月"]，数据集:[{标签:我的第一个数据集"，背景颜色: ['rgba(255, 99, 132, 0.2)','rgba(54, 162, 235, 0.2)','rgba(255, 206, 86, 0.2)','rgba(75, 192, 192, 0.2)','rgba(153, 102, 255, 0.2)','rgba(255, 159, 64, 0.2)'],边框颜色: ['rgba(255,99,132,1)','rgba(54, 162, 235, 1)','rgba(255, 206, 86, 1)','rgba(75, 192, 192, 1)','rgba(153, 102, 255, 1)','rgba(255, 159, 64, 1)'],边框宽度:1，数据:[65、59、80、81、56、55、40]，}]};//加载图表var ctx = $("#myChart");var myBarChart = new Chart(ctx, {类型:'水平条'，数据:数据，选项: {//设置要画线的值的索引lineAtIndex:60，传奇: {显示:假}}});

    <canvas id="myChart"></canvas><script src="https://code.jquery.com/jquery-2.2.4.min.js" 完整性="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script><script src='https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.2.2/Chart.min.js'></script><script src="horizo​​ntalBarPlugin.js"></script><script src="buildChart.js"></script>

   There are many examples of extending a Chart to include a line, both horizontal and vertical. However, I have not found a way to draw a vertical line with a horizontal bar chart.

   1. Horizontal line on horizontal line chart
   2. Vertical line on horizontal line chart
   3. Horizontal line on vertical bar chart

   There is not a "vertical line chart" option like there is a "horizontal bar chart" option. How do I combine a horizontal bar chart with a vertical line?

   Chart.js documentation

   The result would have a bar dataset and a line dataset that can be used on the same chart using the same axis like below:

   解决方案

   ChartJS supports custom plugins. Create a plug in that will read a new property from the chart options and draw the line at the specified index.

   See it on Plunkr

    //Create the plug in
     var originalLineDraw = Chart.controllers.horizontalBar.prototype.draw;
     Chart.helpers.extend(Chart.controllers.horizontalBar.prototype, {
     
         draw: function () {
             originalLineDraw.apply(this, arguments);
     
             var chart = this.chart;
             var ctx = chart.chart.ctx;
     
             var index = chart.config.options.lineAtIndex;
             if (index) {
     
                 var xaxis = chart.scales['x-axis-0'];
                 var yaxis = chart.scales['y-axis-0'];
     
                 var x1 = xaxis.getPixelForValue(index);                       
                 var y1 = yaxis.top;                                                   
     
                 var x2 = xaxis.getPixelForValue(index);                       
                 var y2 = yaxis.bottom;                                        
     
                 ctx.save();
                 ctx.beginPath();
                 ctx.moveTo(x1, y1);
                 ctx.strokeStyle = 'red';
                 ctx.lineTo(x2, y2);
                 ctx.stroke();
     
                 ctx.restore();
             }
         }
     });
   
   //Set up the chart data
     var data = {
         labels: ["January", "February", "March", "April", "May", "June", "July"],
         datasets: [
             {
                 label: "My First dataset",
                 backgroundColor: [
                     'rgba(255, 99, 132, 0.2)',
                     'rgba(54, 162, 235, 0.2)',
                     'rgba(255, 206, 86, 0.2)',
                     'rgba(75, 192, 192, 0.2)',
                     'rgba(153, 102, 255, 0.2)',
                     'rgba(255, 159, 64, 0.2)'
                 ],
                 borderColor: [
                     'rgba(255,99,132,1)',
                     'rgba(54, 162, 235, 1)',
                     'rgba(255, 206, 86, 1)',
                     'rgba(75, 192, 192, 1)',
                     'rgba(153, 102, 255, 1)',
                     'rgba(255, 159, 64, 1)'
                 ],
                 borderWidth: 1,
                 data: [65, 59, 80, 81, 56, 55, 40],
             }
         ]
     };
   
     //Load Chart
     var ctx = $("#myChart");
     var myBarChart = new Chart(ctx, {
         type: 'horizontalBar',
         data: data,
         options: {
             //Set the index of the value where you want to draw the line
             lineAtIndex: 60,
             legend: {
               display: false
             }
         }
     });

       <canvas id="myChart"></canvas>
   
       <script   src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44="   crossorigin="anonymous"></script>
       <script src='https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.2.2/Chart.min.js'></script>
   
       <script src="horizontalBarPlugin.js"></script>
       <script src="buildChart.js"></script>

   这篇关于如何使用 ChartJS 在水平条形图上绘制垂直线?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！