如何使用 Chart JS 将条形图转换为三角形图表?

How to convert a bar chart into a triangle shaped chart using Chart JS?

如何使用 Chart JS 将条形图转换为三角形图表?

例如:示例条形图:如何将其转换为三角形而不是条形?

var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
    type: 'bar',
    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: {
        scales: {
            y: {
                beginAtZero: true
            }
        }
    }
});

您必须实现您自己的自定义图表类型才能执行此操作,因为默认情况下这是不可能的,您可以在文档中阅读如何实现您自己的图表类型:https://www.chartjs.org/docs/master/developers/charts.html

您可以使用 scatter 图表并为每个值定义单独的 datasets

请查看您修改后的代码,看看它是如何工作的。

const labels = ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'];
const data = [12, 19, 3, 5, 2, 3];
const colors = ['255, 99, 132', '54, 162, 235', '255, 206, 86', '75, 192, 192', '153, 102, 255', '255, 159, 64'];

const datasets = labels.map((l, i) => ({
  label: l,
  data: [{ x: i + 1 - 0.45, y: 0 }, { x: i + 1, y: data[i] }, { x: i + 1 + 0.45, y: 0 }],
  fill: true,
  backgroundColor: 'rgba(' + colors[i] + ', 0.2)',
  borderColor: 'rgb(' + colors[i] + ')',
  showLine: true,
  borderWidth: 1,
  lineTension: 0,
  pointRadius: 0,
  pointHitRadius: 0
}));

new Chart('myChart', {
  type: 'scatter',
  data: {
    datasets: datasets
  },
  options: {
    scales: {
      y: {
        beginAtZero: true
      },
      x: {
        min: 0,
        max: labels.length + 1,
        ticks: {
          callback: (v, i) => labels[i - 1] 
        },
        grid: {
          display: false
        }
      }
    }
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.3.2/chart.min.js"></script>
<canvas id="myChart" height="110"></canvas>