仪表盘自定义指针形状

import { Chart } from '@antv/g2';
import { Path } from '@antv/g';

const chart = new Chart({ container: 'container' });

function getOrigin(points) {
  if (points.length === 1) return points[0];
  const [[x0, y0, z0 = 0], [x2, y2, z2 = 0]] = points;
  return [(x0 + x2) / 2, (y0 + y2) / 2, (z0 + z2) / 2];
}
// 自定义指针形状
const customShape = (style) => {
  return (points, value, coordinate, theme) => {
    // 获取几何点中心坐标
    const [x, y] = getOrigin(points);
    const [cx, cy] = coordinate.getCenter();
    // 计算指针方向角度
    const angle = Math.atan2(y - cy, x - cx);
    const length = 100; // 指针长度
    const width = 8; // 指针底部宽度
    // 构造指针三角形路径
    return new Path({
      style: {
        d: [
          ['M', cx + Math.cos(angle) * length, cy + Math.sin(angle) * length], // 顶点
          [
            'L',
            cx + Math.cos(angle + Math.PI / 2) * width,
            cy + Math.sin(angle + Math.PI / 2) * width,
          ], // 底部左点
          [
            'L',
            cx + Math.cos(angle - Math.PI / 2) * width,
            cy + Math.sin(angle - Math.PI / 2) * width,
          ], // 底部右点
          ['Z'], // 闭合路径
        ],
        fill: '#30BF78', // 填充色
      },
    });
  };
};

chart.options({
  type: 'gauge',
  data: {
    value: {
      target: 159,
      total: 424,
      name: 'score',
    },
  },
  style: {
    pointerShape: customShape,
    pinShape: false,
    textContent: (target, total) => {
      return `得分：${target}\n占比：${(target / total) * 100}%`;
    },
  },
});

chart.render();