255 lines
7.2 KiB
JavaScript
255 lines
7.2 KiB
JavaScript
import { imgToDataUrl, downloadFile } from './utils'
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import JsPDF from 'jspdf'
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import { SVG } from '@svgdotjs/svg.js'
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import drawBackgroundImageToCanvas from './utils/simulateCSSBackgroundInCanvas'
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import { transformToMarkdown } from './parse/toMarkdown'
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const URL = window.URL || window.webkitURL || window
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// 导出类
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class Export {
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// 构造函数
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constructor(opt) {
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this.mindMap = opt.mindMap
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this.exportPadding = this.mindMap.opt.exportPadding
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}
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// 导出
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async export(type, isDownload = true, name = '思维导图', ...args) {
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if (this[type]) {
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let result = await this[type](name, ...args)
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if (isDownload && type !== 'pdf') {
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downloadFile(result, name + '.' + type)
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}
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return result
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} else {
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return null
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}
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}
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// 获取svg数据
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async getSvgData(domToImage) {
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let { svg, svgHTML } = this.mindMap.getSvgData()
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// 把图片的url转换成data:url类型，否则导出会丢失图片
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let imageList = svg.find('image')
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let task = imageList.map(async item => {
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let imgUlr = item.attr('href') || item.attr('xlink:href')
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let imgData = await imgToDataUrl(imgUlr)
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item.attr('href', imgData)
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})
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await Promise.all(task)
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// 如果开启了富文本编辑，需要把svg中的dom元素转换成图片
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let nodeWithDomToImg = null
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if (domToImage && this.mindMap.richText) {
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let res = await this.mindMap.richText.handleSvgDomElements(svg)
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if (res) {
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nodeWithDomToImg = res.svg
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svgHTML = res.svgHTML
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}
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}
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return {
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node: svg,
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str: svgHTML,
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nodeWithDomToImg
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}
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}
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// svg转png
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svgToPng(svgSrc) {
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return new Promise((resolve, reject) => {
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const img = new Image()
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// 跨域图片需要添加这个属性，否则画布被污染了无法导出图片
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img.setAttribute('crossOrigin', 'anonymous')
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img.onload = async () => {
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try {
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let canvas = document.createElement('canvas')
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canvas.width = img.width + this.exportPadding * 2
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canvas.height = img.height + this.exportPadding * 2
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let ctx = canvas.getContext('2d')
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// 绘制背景
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await this.drawBackgroundToCanvas(ctx, canvas.width, canvas.height)
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// 图片绘制到canvas里
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ctx.drawImage(
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img,
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0,
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0,
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img.width,
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img.height,
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this.exportPadding,
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this.exportPadding,
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img.width,
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img.height
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)
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resolve(canvas.toDataURL())
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} catch (error) {
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reject(error)
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}
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}
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img.onerror = e => {
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reject(e)
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}
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img.src = svgSrc
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})
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}
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// 在canvas上绘制思维导图背景
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drawBackgroundToCanvas(ctx, width, height) {
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return new Promise((resolve, reject) => {
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let {
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backgroundColor = '#fff',
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backgroundImage,
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backgroundRepeat = 'no-repeat',
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backgroundPosition = 'center center',
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backgroundSize = 'cover',
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} = this.mindMap.themeConfig
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// 背景颜色
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ctx.save()
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ctx.rect(0, 0, width, height)
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ctx.fillStyle = backgroundColor
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ctx.fill()
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ctx.restore()
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// 背景图片
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if (backgroundImage && backgroundImage !== 'none') {
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ctx.save()
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drawBackgroundImageToCanvas(ctx, width, height, backgroundImage, {
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backgroundRepeat,
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backgroundPosition,
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backgroundSize
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}, (err) => {
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if (err) {
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reject(err)
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} else {
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resolve()
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}
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ctx.restore()
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})
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} else {
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resolve()
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}
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})
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}
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// 导出为png
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/**
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* 方法1.把svg的图片都转化成data:url格式，再转换
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* 方法2.把svg的图片提取出来再挨个绘制到canvas里，最后一起转换
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*/
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async png() {
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let { str } = await this.getSvgData(true)
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// 转换成blob数据
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let blob = new Blob([str], {
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type: 'image/svg+xml'
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})
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// 转换成data:url数据
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let svgUrl = URL.createObjectURL(blob)
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// 绘制到canvas上
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let imgDataUrl = await this.svgToPng(svgUrl)
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URL.revokeObjectURL(svgUrl)
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return imgDataUrl
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}
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// 导出为pdf
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async pdf(name) {
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let img = await this.png()
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let pdf = new JsPDF('', 'pt', 'a4')
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let a4Width = 595
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let a4Height = 841
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let a4Ratio = a4Width / a4Height
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let image = new Image()
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image.onload = () => {
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let imageWidth = image.width
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let imageHeight = image.height
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let imageRatio = imageWidth / imageHeight
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let w, h
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if (imageWidth <= a4Width && imageHeight <= a4Height) {
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// 使用图片原始宽高
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w = imageWidth
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h = imageHeight
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} else if (a4Ratio > imageRatio) {
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// 以a4Height为高度，缩放图片宽度
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w = imageRatio * a4Height
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h = a4Height
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} else {
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// 以a4Width为宽度，缩放图片高度
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w = a4Width
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h = a4Width / imageRatio
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}
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pdf.addImage(img, 'PNG', (a4Width - w) / 2, (a4Height - h) / 2, w, h)
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pdf.save(name)
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}
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image.src = img
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}
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// 在svg上绘制思维导图背景
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drawBackgroundToSvg(svg) {
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return new Promise(async resolve => {
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let {
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backgroundColor = '#fff',
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backgroundImage,
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backgroundRepeat = 'repeat'
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} = this.mindMap.themeConfig
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// 背景颜色
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svg.css('background-color', backgroundColor)
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// 背景图片
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if (backgroundImage && backgroundImage !== 'none') {
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let imgDataUrl = await imgToDataUrl(backgroundImage)
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svg.css('background-image', `url(${imgDataUrl})`)
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svg.css('background-repeat', backgroundRepeat)
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resolve()
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} else {
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resolve()
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}
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})
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}
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// 导出为svg
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// domToImage：是否将svg中的dom节点转换成图片的形式
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// plusCssText：附加的css样式，如果svg中存在dom节点，想要设置一些针对节点的样式可以通过这个参数传入
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async svg(name, domToImage = false, plusCssText) {
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let { node, nodeWithDomToImg } = await this.getSvgData(domToImage)
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// 开启了节点富文本编辑
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if (this.mindMap.richText) {
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if (domToImage) {
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node = nodeWithDomToImg
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} else if (plusCssText) {
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let foreignObjectList = node.find('foreignObject')
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if (foreignObjectList.length > 0) {
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foreignObjectList[0].add(SVG(`<style>${plusCssText}</style>`))
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}
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}
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}
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node.first().before(SVG(`<title>${name}</title>`))
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await this.drawBackgroundToSvg(node)
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let str = node.svg()
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// 转换成blob数据
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let blob = new Blob([str], {
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type: 'image/svg+xml'
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})
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return URL.createObjectURL(blob)
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}
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// 导出为json
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json(name, withConfig = true) {
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let data = this.mindMap.getData(withConfig)
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let str = JSON.stringify(data)
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let blob = new Blob([str])
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return URL.createObjectURL(blob)
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}
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// 专有文件，其实就是json文件
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smm(name, withConfig) {
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return this.json(name, withConfig)
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}
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// markdown文件
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md() {
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let data = this.mindMap.getData()
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let content = transformToMarkdown(data)
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let blob = new Blob([content])
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return URL.createObjectURL(blob)
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}
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}
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Export.instanceName = 'doExport'
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export default Export
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