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pdfjs-dist-tests.ts
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pdfjs-dist-tests.ts
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import { getDocument, PDFDocumentProxy, PDFPromise, Util } from 'pdfjs-dist';
//
// Fetch the PDF document from the URL using promises
//
var pdfDoc: PDFDocumentProxy;
var pageNum: number;
getDocument('helloworld.pdf').promise.then(function (pdf) {
// Using promise to fetch the page
pdfDoc = pdf;
pageNum = 1;
renderPage(pageNum);
});
function renderPage(pageNum: number) {
pdfDoc.getPage(pageNum).then(function (page) {
var scale = 1.5;
var viewport = page.getViewport({scale: scale});
//
// Prepare canvas using PDF page dimensions
//
var canvas = <HTMLCanvasElement>document.getElementById('the-canvas');
var context = canvas.getContext('2d');
canvas.height = viewport.height;
canvas.width = viewport.width;
//
// test viewport conversion methods
// convertToViewportRectangle and normalizeRect are used in the acroforms example:
// https://github.com/mozilla/pdf.js/blob/master/examples/acroforms/forms.js
//
const rect = viewport.convertToViewportRectangle([100,100,0,0]);
const normalizedRect = Util.normalizeRect(rect);
const point = viewport.convertToViewportPoint(100, 100);
const pdfPoint = viewport.convertToPdfPoint(100, 100);
//
// Render PDF page into canvas context
//
var renderContext = {
canvasContext: context,
viewport: viewport
};
page.render(renderContext);
});
}
function goNext() {
if (pdfDoc && pageNum < pdfDoc.numPages) {
++pageNum;
renderPage(pageNum);
}
}
//
// Test PDFPromise allows return value mutation
//
var promise: PDFPromise<string> = getDocument('helloworld.pdf').promise.then(pdf => {
return "arbitrary string";
});