84 lines
3.0 KiB
HTML
84 lines
3.0 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!' base64 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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// atob() is used to convert base64 encoded PDF to binary-like data.
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// (See also https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/
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// Base64_encoding_and_decoding.)
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var pdfData = atob(
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'JVBERi0xLjcKCjEgMCBvYmogICUgZW50cnkgcG9pbnQKPDwKICAvVHlwZSAvQ2F0YWxvZwog' +
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'IC9QYWdlcyAyIDAgUgo+PgplbmRvYmoKCjIgMCBvYmoKPDwKICAvVHlwZSAvUGFnZXMKICAv' +
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'TWVkaWFCb3ggWyAwIDAgMjAwIDIwMCBdCiAgL0NvdW50IDEKICAvS2lkcyBbIDMgMCBSIF0K' +
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'Pj4KZW5kb2JqCgozIDAgb2JqCjw8CiAgL1R5cGUgL1BhZ2UKICAvUGFyZW50IDIgMCBSCiAg' +
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'L1Jlc291cmNlcyA8PAogICAgL0ZvbnQgPDwKICAgICAgL0YxIDQgMCBSIAogICAgPj4KICA+' +
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'PgogIC9Db250ZW50cyA1IDAgUgo+PgplbmRvYmoKCjQgMCBvYmoKPDwKICAvVHlwZSAvRm9u' +
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'dAogIC9TdWJ0eXBlIC9UeXBlMQogIC9CYXNlRm9udCAvVGltZXMtUm9tYW4KPj4KZW5kb2Jq' +
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'Cgo1IDAgb2JqICAlIHBhZ2UgY29udGVudAo8PAogIC9MZW5ndGggNDQKPj4Kc3RyZWFtCkJU' +
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'CjcwIDUwIFRECi9GMSAxMiBUZgooSGVsbG8sIHdvcmxkISkgVGoKRVQKZW5kc3RyZWFtCmVu' +
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'ZG9iagoKeHJlZgowIDYKMDAwMDAwMDAwMCA2NTUzNSBmIAowMDAwMDAwMDEwIDAwMDAwIG4g' +
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'CjAwMDAwMDAwNzkgMDAwMDAgbiAKMDAwMDAwMDE3MyAwMDAwMCBuIAowMDAwMDAwMzAxIDAw' +
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'MDAwIG4gCjAwMDAwMDAzODAgMDAwMDAgbiAKdHJhaWxlcgo8PAogIC9TaXplIDYKICAvUm9v' +
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'dCAxIDAgUgo+PgpzdGFydHhyZWYKNDkyCiUlRU9G');
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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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// Opening PDF by passing its binary data as a string. It is still preferable
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// to use Uint8Array, but string or array-like structure will work too.
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var loadingTask = pdfjsLib.getDocument({ data: pdfData, });
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(async function() {
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var pdf = await loadingTask.promise;
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// Fetch the first page.
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var page = await pdf.getPage(1);
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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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// Prepare canvas using PDF page dimensions.
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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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// Render PDF page into canvas context.
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var renderContext = {
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canvasContext: context,
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transform,
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viewport,
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};
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page.render(renderContext);
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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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