我正在尝试创建一个如下图所示的图表。
到目前为止,我设法用甜甜圈图获得了显示在中间的值,但没有像圆弧图那样显示在中间。这是我的代码
Chart.pluginService.register({
beforeDraw: function(chart) {
var width = chart.chart.width,
height = chart.chart.height,
ctx = chart.chart.ctx
ctx.restore()
var fontSize = (height / 114).toFixed(2)
ctx.font = fontSize + 'em sans-serif'
ctx.textBaseline = 'middle'
var text = chart.config.data.text,
textX = Math.round((width - ctx.measureText(text).width) / 2),
textY = height / 2
ctx.fillText(text, textX, textY)
ctx.save()
},
})
关于如何实现这一目标的任何想法?
答案 0 :(得分:1)
您可能想在rotation
对象中circumference
,options
:
var ctx = document.getElementById("myChart");
var myChart = new Chart(ctx, {
type: 'doughnut',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
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
}]
},
options: {
rotation: 1 * Math.PI,
circumference: 1 * Math.PI
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.bundle.js"></script>
<div id="canvas-holder" style="width:40%">
<canvas id="myChart" width="533" height="266" class="my-chart">
</canvas>
</div>
<style>
canvas {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
.my-chart {
display: block;
width: 533px;
height: 266px;
}
</style>