data_analysis/utils/chart-kit.js

// npm install echarts canvas

const fs = require('fs');
const { createCanvas } = require('canvas');
const echarts = require('echarts');

module.exports = class ChartKit {
  static printChart(dataList) {
    // 创建一个 canvas 实例
    const width = 1920; // 宽度
    const height = 1080; // 高度
    const canvas = createCanvas(width, height);

    // 初始化 ECharts 实例
    const chart = echarts.init(canvas);

    // ECharts 配置项
    let option = {
      title: {
        text: '散点图'
      },
      xAxis: {},
      yAxis: {},
      series: [
        {
          symbolSize: 10,
          data: dataList,
          type: 'scatter'
        }
      ]
    };

    // 设置图表的配置项和数据
    chart.setOption(option);

    // 等待图表渲染完毕
    setTimeout(() => {
      const buffer = canvas.toBuffer('image/png');
      fs.writeFileSync('chart.png', buffer);
      chart.dispose(); // 释放图表实例，防止内存泄漏
      console.log('图表已保存为 chart.png');
    }, 1000); // 设置一个延时以确保图表渲染完成
  }
}