ECharts在散点图上绘制多边形

// 创建散点图的基础配置对象
var option = {
  xAxis: {},
  yAxis: {},
  series: [{
    type: 'scatter',
    data: [
      [10, 20],
      [30, 40],
      [50, 60],
      // ...
    ]
  }]
};

// 定义自定义系列
option.series.push({
  type: 'custom',
  renderItem: function(params, api) {
    var points = params.points; // 散点的坐标数组
    var context = api.getContext(); // 获取绘图上下文

    // 绘制多边形
    context.beginPath();
    context.moveTo(points[0][0], points[0][1]);
    for (var i = 1; i < points.length; i++) {
      context.lineTo(points[i][0], points[i][1]);
    }
    context.closePath();
    context.stroke();
  }
});

// 将配置应用到图表中
var chart = echarts.init(document.getElementById('chart-container'));
chart.setOption(option);