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Merge pull request #225 from ssshooter/feat/export-svg
Yeah! Finally we can export image!
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,205 @@ | ||
| import type { Topic } from '../types/dom' | ||
| import type { MindElixirInstance } from '../types' | ||
| import { setAttributes } from '../utils' | ||
| import { getOffsetLT } from '../utils' | ||
|
|
||
| function createSvgDom(height: string, width: string) { | ||
| const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg') | ||
| setAttributes(svg, { | ||
| version: '1.1', | ||
| xmlns: 'http://www.w3.org/2000/svg', | ||
| height, | ||
| width, | ||
| }) | ||
| return svg | ||
| } | ||
|
|
||
| function lineHightToPadding(lineHeight: string, fontSize: string) { | ||
| return (parseInt(lineHeight) - parseInt(fontSize)) / 2 | ||
| } | ||
|
|
||
| function generateSvgText(tpc: HTMLElement, tpcStyle: CSSStyleDeclaration, x: number, y: number) { | ||
| const g = document.createElementNS('http://www.w3.org/2000/svg', 'g') | ||
| const content = tpc.childNodes[0].textContent | ||
| const lines = content!.split('\n') | ||
| lines.forEach((line, index) => { | ||
| const text = document.createElementNS('http://www.w3.org/2000/svg', 'text') | ||
| setAttributes(text, { | ||
| x: x + parseInt(tpcStyle.paddingLeft) + '', | ||
| y: | ||
| y + | ||
| parseInt(tpcStyle.paddingTop) + | ||
| lineHightToPadding(tpcStyle.lineHeight, tpcStyle.fontSize) * (index + 1) + | ||
| parseFloat(tpcStyle.fontSize) * (index + 1) + | ||
| '', | ||
| 'text-anchor': 'start', | ||
| 'font-family': tpcStyle.fontFamily, | ||
| 'font-size': `${tpcStyle.fontSize}`, | ||
| 'font-weight': `${tpcStyle.fontWeight}`, | ||
| fill: `${tpcStyle.color}`, | ||
| }) | ||
| text.innerHTML = line | ||
| g.appendChild(text) | ||
| }) | ||
| return g | ||
| } | ||
|
|
||
| function generateSvgTextUsingForeignObject(tpc: HTMLElement, tpcStyle: CSSStyleDeclaration, x: number, y: number) { | ||
| const content = tpc.childNodes[0].textContent! | ||
| const foreignObject = document.createElementNS('http://www.w3.org/2000/svg', 'foreignObject') | ||
| setAttributes(foreignObject, { | ||
| x: x + parseInt(tpcStyle.paddingLeft) + '', | ||
| y: y + parseInt(tpcStyle.paddingTop) + '', | ||
| width: tpcStyle.width, | ||
| height: tpcStyle.height, | ||
| }) | ||
| const div = document.createElement('div') | ||
| setAttributes(div, { | ||
| xmlns: 'http://www.w3.org/1999/xhtml', | ||
| style: `font-family: ${tpcStyle.fontFamily}; font-size: ${tpcStyle.fontSize}; font-weight: ${tpcStyle.fontWeight}; color: ${tpcStyle.color}; white-space: pre-wrap;`, | ||
| }) | ||
| div.innerHTML = content | ||
| foreignObject.appendChild(div) | ||
| return foreignObject | ||
| } | ||
|
|
||
| function convertDivToSvg(mei: MindElixirInstance, tpc: HTMLElement, useForeignObject = false) { | ||
| const tpcStyle = getComputedStyle(tpc) | ||
| const { offsetLeft: x, offsetTop: y } = getOffsetLT(mei.nodes, tpc) | ||
|
|
||
| const bg = document.createElementNS('http://www.w3.org/2000/svg', 'rect') | ||
| setAttributes(bg, { | ||
| x: x + '', | ||
| y: y + '', | ||
| rx: tpcStyle.borderRadius, | ||
| ry: tpcStyle.borderRadius, | ||
| width: tpcStyle.width, | ||
| height: tpcStyle.height, | ||
| fill: tpcStyle.backgroundColor, | ||
| stroke: tpcStyle.borderColor, | ||
| 'stroke-width': tpcStyle.borderWidth, | ||
| }) | ||
| const g = document.createElementNS('http://www.w3.org/2000/svg', 'g') | ||
| g.appendChild(bg) | ||
| let text: SVGGElement | null | ||
| if (useForeignObject) { | ||
| text = generateSvgTextUsingForeignObject(tpc, tpcStyle, x, y) | ||
| } else text = generateSvgText(tpc, tpcStyle, x, y) | ||
| g.appendChild(text) | ||
| return g | ||
| } | ||
|
|
||
| function convertAToSvg(mei: MindElixirInstance, a: HTMLAnchorElement) { | ||
| const aStyle = getComputedStyle(a) | ||
| const { offsetLeft: x, offsetTop: y } = getOffsetLT(mei.nodes, a) | ||
| const svgA = document.createElementNS('http://www.w3.org/2000/svg', 'a') | ||
| const text = document.createElementNS('http://www.w3.org/2000/svg', 'text') | ||
| setAttributes(text, { | ||
| x: x + '', | ||
| y: y + parseInt(aStyle.fontSize) + '', | ||
| 'text-anchor': 'start', | ||
| 'font-family': aStyle.fontFamily, | ||
| 'font-size': `${aStyle.fontSize}`, | ||
| 'font-weight': `${aStyle.fontWeight}`, | ||
| fill: `${aStyle.color}`, | ||
| }) | ||
| text.innerHTML = a.textContent! | ||
| svgA.appendChild(text) | ||
| svgA.setAttribute('href', a.href) | ||
| return svgA | ||
| } | ||
|
|
||
| const padding = 100 | ||
|
|
||
| const head = `<?xml version="1.0" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">` | ||
|
|
||
| const generateSvg = (mei: MindElixirInstance) => { | ||
| const mapDiv = mei.nodes | ||
| const height = mapDiv.offsetHeight + padding * 2 | ||
| const width = mapDiv.offsetWidth + padding * 2 | ||
| const svg = createSvgDom(height + 'px', width + 'px') | ||
| const g = document.createElementNS('http://www.w3.org/2000/svg', 'svg') | ||
| const bgColor = document.createElementNS('http://www.w3.org/2000/svg', 'rect') | ||
| setAttributes(bgColor, { | ||
| x: '0', | ||
| y: '0', | ||
| width: `${width}`, | ||
| height: `${height}`, | ||
| fill: mei.theme.cssVar['--bgcolor'] as string, | ||
| }) | ||
| svg.appendChild(bgColor) | ||
| mapDiv.querySelectorAll('.subLines').forEach(item => { | ||
| const clone = item.cloneNode(true) as SVGSVGElement | ||
| const { offsetLeft, offsetTop } = getOffsetLT(mapDiv, item.parentElement as HTMLElement) | ||
| clone.setAttribute('x', `${offsetLeft}`) | ||
| clone.setAttribute('y', `${offsetTop}`) | ||
| g.appendChild(clone) | ||
| }) | ||
|
|
||
| const mainLine = mapDiv.querySelector('.lines')?.cloneNode(true) | ||
| mainLine && g.appendChild(mainLine) | ||
| const topiclinks = mapDiv.querySelector('.topiclinks')?.cloneNode(true) | ||
| topiclinks && g.appendChild(topiclinks) | ||
| const summaries = mapDiv.querySelector('.summary')?.cloneNode(true) | ||
| summaries && g.appendChild(summaries) | ||
|
|
||
| mapDiv.querySelectorAll('me-tpc').forEach(tpc => { | ||
| g.appendChild(convertDivToSvg(mei, tpc as Topic, true)) | ||
| }) | ||
| mapDiv.querySelectorAll('.tags > span').forEach(tag => { | ||
| g.appendChild(convertDivToSvg(mei, tag as HTMLElement)) | ||
| }) | ||
| mapDiv.querySelectorAll('.icons > span').forEach(icon => { | ||
| g.appendChild(convertDivToSvg(mei, icon as HTMLElement)) | ||
| }) | ||
| mapDiv.querySelectorAll('.hyper-link').forEach(hl => { | ||
| g.appendChild(convertAToSvg(mei, hl as HTMLAnchorElement)) | ||
| }) | ||
| setAttributes(g, { | ||
| x: padding + '', | ||
| y: padding + '', | ||
| overflow: 'visible', | ||
| }) | ||
| svg.appendChild(g) | ||
| return head + svg.outerHTML | ||
| } | ||
|
|
||
| function blobToUrl(blob: Blob): Promise<string> { | ||
| return new Promise((resolve, reject) => { | ||
| const reader = new FileReader() | ||
| reader.onload = evt => { | ||
| resolve(evt.target!.result as string) | ||
| } | ||
| reader.onerror = err => { | ||
| reject(err) | ||
| } | ||
| reader.readAsDataURL(blob) | ||
| }) | ||
| } | ||
|
|
||
| export const exportSvg = function (this: MindElixirInstance) { | ||
| const svgString = generateSvg(this) | ||
| const blob = new Blob([svgString], { type: 'image/svg+xml' }) | ||
| return blob | ||
| } | ||
|
|
||
| export const exportPng = async function (this: MindElixirInstance): Promise<Blob | null> { | ||
| const svgString = generateSvg(this) | ||
| const blob = new Blob([svgString], { type: 'image/svg+xml' }) | ||
| // use base64 to bypass canvas taint | ||
| const url = await blobToUrl(blob) | ||
| return new Promise((resolve, reject) => { | ||
| const img = new Image() | ||
| img.setAttribute('crossOrigin', 'anonymous') | ||
| img.onload = () => { | ||
| const canvas = document.createElement('canvas') | ||
| canvas.width = img.width | ||
| canvas.height = img.height | ||
| const ctx = canvas.getContext('2d')! | ||
| ctx.drawImage(img, 0, 0) | ||
| canvas.toBlob(resolve, 'image/png', 1) | ||
| } | ||
| img.src = url | ||
| img.onerror = reject | ||
| }) | ||
| } |
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