46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
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import PDFDocument from 'pdfkit/js/pdfkit.standalone'
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/**
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* PdfKit, the library we're using for pdf generation, uses points as a unit, so when we tell it things like where to put the svg and how big the svg is, we need those numbers to be in points
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* The svg uses mm internally, so when we do spatial reasoning inside the svg, we need to know values in mm
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* */
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export const mmToPoints = 2.834645669291339
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/**
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* A PDFKit Pdf with a few of our utilities included
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* @returns
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*/
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export const Pdf = ({ size, layout }) => {
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const pdf = new PDFDocument({
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size,
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layout,
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})
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// PdfKit wants to flush the buffer on each new page.
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// We can't save directly from inside a worker, so we have to manage the buffers ourselves so we can return a blob
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const buffers = []
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// use a listener to add new data to our buffer storage
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pdf.on('data', buffers.push.bind(buffers))
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/** convert the pdf to a blob */
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pdf.toBlob = function () {
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return new Promise((resolve) => {
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// have to do it this way so that the document flushes everything to buffers
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pdf.on('end', () => {
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// convert buffers to a blob
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resolve(
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new Blob(buffers, {
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type: 'application/pdf',
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})
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)
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})
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// end the stream
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pdf.end()
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})
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}
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return pdf
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}
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