b39cd706a6
This is essentially a simplified version of the code that's used in `PDFPageView`, which will hopefully reduce the number of issues opened specifically about blurry rendering. However, note that *ideally* users should base their implementations on the `components/` examples rather than using the API directly (the "viewer components" already support HiDPI-screens).
79 lines
1.9 KiB
HTML
79 lines
1.9 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>'Hello, world!' example</title>
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</head>
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<body>
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<h1>'Hello, world!' example</h1>
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<canvas id="the-canvas" style="border: 1px solid black; direction: ltr;"></canvas>
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<script src="../../node_modules/pdfjs-dist/build/pdf.js"></script>
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<script id="script">
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//
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// If absolute URL from the remote server is provided, configure the CORS
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// header on that server.
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//
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var url = './helloworld.pdf';
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//
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// The workerSrc property shall be specified.
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//
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pdfjsLib.GlobalWorkerOptions.workerSrc =
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'../../node_modules/pdfjs-dist/build/pdf.worker.js';
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//
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// Asynchronous download PDF
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//
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var loadingTask = pdfjsLib.getDocument(url);
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loadingTask.promise.then(function(pdf) {
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//
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// Fetch the first page
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//
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pdf.getPage(1).then(function(page) {
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var scale = 1.5;
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var viewport = page.getViewport({ scale: scale, });
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// Support HiDPI-screens.
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var outputScale = window.devicePixelRatio || 1;
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//
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// Prepare canvas using PDF page dimensions
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//
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var canvas = document.getElementById('the-canvas');
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var context = canvas.getContext('2d');
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canvas.width = Math.floor(viewport.width * outputScale);
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canvas.height = Math.floor(viewport.height * outputScale);
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canvas.style.width = Math.floor(viewport.width) + "px";
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canvas.style.height = Math.floor(viewport.height) + "px";
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var transform = outputScale !== 1
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? [outputScale, 0, 0, outputScale, 0, 0]
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: null;
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//
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// Render PDF page into canvas context
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//
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var renderContext = {
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canvasContext: context,
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transform: transform,
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viewport: viewport,
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};
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page.render(renderContext);
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});
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});
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</script>
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<hr>
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<h2>JavaScript code:</h2>
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<pre id="code"></pre>
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<script>
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document.getElementById('code').textContent =
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document.getElementById('script').text;
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</script>
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</body>
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</html>
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