echarts export three types picture: png、html、svg 

import './styles.css'
import echarts from 'echarts'
import { saveAs } from 'file-saver'
import JSPDF from 'jspdf'
import { init } from 'canvas-to-blob'

init()

function exportImage(images) {
  const canvas = mergeCanvas(images)
  canvas.toBlob(blob => {
    saveAs(blob, 'exports-captcha.png')
  })
}

function exportHtml(images) {
  const canvas = mergeCanvas(images)
  const imageUrl = canvas.toDataURL('image/png', 1)
  var blob = new Blob(
    [
      `<!DOCTYPE html>
  <html>
    <head>
      <title>测试导出标题</title>
      <meta charset="UTF-8" />
    </head>
    <body>
      <img src="${imageUrl}" alt="测试导出标题">
    </body>
  </html>
  `
    ],
    { type: 'text/html;charset=utf-8' }
  )
  saveAs(blob, 'exports.html')
}

function exportPdf(images) {
  const pdf = new JSPDF()
  const canvas = mergeCanvas(images)
  const imageUrl = canvas.toDataURL('image/png', 1)
  pdf.text('Hello world!', 10, 10)
  pdf.addImage(imageUrl, 'png', 0, 20)
  pdf.save('exports.pdf')
}

function mergeCanvas(images) {
  var canvas = document.createElement('canvas')
  var [maxH, maxW] = images.reduce(
    (ac, image) => {
      ac[0] = ac[0] + image.getHeight()
      if (image.getWidth() > ac[1]) ac[1] = image.getWidth()
      return ac
    },
    [0, 0]
  )
  canvas.width = maxW
  canvas.height = maxH

  var context = canvas.getContext('2d')
  var top = 0,
    left = 0
  images.forEach(image => {
    const [w, h] = [image.getWidth(), image.getHeight()]
    context.drawImage(image.getRenderedCanvas(), left, top, w, h)
    top += h
  })
  return canvas
}

var myChart2 = echarts.init(document.getElementById('canvas2'))
var myChart = echarts.init(document.getElementById('canvas'))

function initLineChart() {
  var option = {
    xAxis: {
      type: 'category',
      data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
      type: 'value'
    },
    series: [
      {
        data: [820, 932, 901, 934, 1290, 1330, 1320],
        type: 'line'
      }
    ]
  }

  // 使用刚指定的配置项和数据显示图表。
  myChart2.setOption(option)
}

function initBarChart() {
  var option = {
    title: {
      text: 'ECharts 入门示例'
    },
    tooltip: {},
    legend: {
      data: ['销量']
    },
    xAxis: {
      data: ['衬衫', '羊毛衫', '雪纺衫', '裤子', '高跟鞋', '袜子']
    },
    yAxis: {},
    series: [
      {
        name: '销量',
        type: 'bar',
        data: [5, 20, 36, 10, 10, 20]
      }
    ]
  }

  // 使用刚指定的配置项和数据显示图表。
  myChart.setOption(option)
}

document.getElementById('export-image').onclick = () => exportImage([myChart, myChart2])
document.getElementById('export-html').onclick = () => exportHtml([myChart, myChart2])
document.getElementById('export-pdf').onclick = () => exportPdf([myChart, myChart2])

initLineChart()
initBarChart()

 

posted @ 2023-03-29 09:40  李卫泽  阅读(182)  评论(0)    收藏  举报