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45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
import JsPDF from 'jspdf'
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// 导出PDF插件，需要通过Export插件使用
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class ExportPDF {
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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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}
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// 导出为pdf
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pdf(name, img) {
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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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}
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ExportPDF.instanceName = 'doExportPDF'
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export default ExportPDF
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