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.
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.horizontalBar.prototype.draw;Chart.helpers.extend(Chart.controllers.horizontalBar.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="horizontalBarPlugin.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.
Horizontal line on horizontal line chart Vertical line on horizontal line chart Horizontal line on vertical bar chartThere 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>