chart.js - 更改 Chartjs 图例图标样式

Question

我正在尝试更改我的 Chartjs 图标图例样式，如我的屏幕截图所示。是否可以 ？

<!-- https://codepen.io/IrvingLee/pen/boqrEQ --> 

Answer 1

是的! 有可能的。

第一

设置 usePointStyle 属性(property)到 true 对于图例标签，在您的图表选项中，如下所示:

options: {
      legend: {
         labels: {
            usePointStyle: true
         }
      },
      ...

第二

套装 pointStyle 每个数据集的属性(根据您的要求)，例如:

datasets: [{
   ...
   pointStyle: 'line'
}, {
   ...
   pointStyle: 'rect'
}]

ᴡᴏʀᴋɪɴɢ ᴇxᴀᴍᴘʟᴇ ⧩

var data = {
   labels: ['Value [mm]', ''],
   datasets: [{
      label: "Hi-Hi Limit",
      type: 'line',
      data: [5432, 5432],
      backgroundColor: 'rgba(250, 255, 255, 0)',
      borderColor: 'rgba(255, 4, 0, 100)',
      borderWidth: 3,
      radius: 0,
      pointStyle: 'line'
   }, {
      label: "Hi Limit",
      type: 'line',
      data: [5130, 5130],
      backgroundColor: 'rgba(250, 255, 255, 0)',
      borderColor: 'rgba(250, 255, 0, 100)',
      borderWidth: 3,
      radius: 0,
      pointStyle: 'line'
   }, {
      label: "Lo Limit",
      type: 'line',
      data: [905, 905],
      backgroundColor: 'rgba(250, 255, 255, 0)',
      borderColor: 'rgba(250, 255, 0, 100)',
      borderWidth: 3,
      radius: 0,
      pointStyle: 'line'
   }, {
      label: "Lo-Lo Limit",
      type: 'line',
      data: [604, 604],
      backgroundColor: 'rgba(250, 255, 255, 0)',
      borderColor: 'rgba(255, 4, 0, 100)',
      borderWidth: 3,
      radius: 0,
      pointStyle: 'line'
   }, {
      type: 'line',
      label: "Level",
      data: [4800, 4800],
      backgroundColor: 'rgba(0, 119, 220, 1)',
      borderColor: 'rgba(0, 119, 220, 1)',
      borderWidth: 1,
      radius: 0,
      pointStyle: 'rect'
   }],

};

var options = {
   legend: {
      position: 'right',
      labels: {
         usePointStyle: true
      }
   },
   scales: {
      yAxes: [{
         gridLines: {
            display: true,
            color: "rgba(255,99,132,0.2)"
         }
      }],
      xAxes: [{
         gridLines: {
            display: false
         }
      }]
   }
};

Chart.Bar('chart', {
   options: options,
   data: data
});

body {
   background: #1D1F20;
   padding: 16px;
}

.chart-container {
   position: relative;
   margin: auto;
   height: 80vh;
   width: 80vw;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<div class="chart-container">
   <canvas id="chart"></canvas>
</div>