55 lines
1.3 KiB
JavaScript
55 lines
1.3 KiB
JavaScript
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
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//
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// See README for overview
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//
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'use strict';
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//
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// Ajax GET request, for binary files
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// (like jQuery's $.get(), but supports the binary type ArrayBuffer)
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//
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var ajaxGet = function(url, callback) {
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var xhr = new XMLHttpRequest();
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xhr.open('GET', url);
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xhr.mozResponseType = xhr.responseType = 'arraybuffer';
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xhr.expected = (document.URL.indexOf('file:') === 0) ? 0 : 200;
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xhr.onreadystatechange = function() {
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if (xhr.readyState === 4 && xhr.status === xhr.expected) {
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var data = (xhr.mozResponseArrayBuffer || xhr.mozResponse ||
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xhr.responseArrayBuffer || xhr.response);
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callback(data);
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}
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};
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xhr.send(null);
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};
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//
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// This is where the fun happens
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//
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ajaxGet('helloworld.pdf', function ajaxGetHelloWorld(data) {
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//
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// Instantiate PDFDoc with PDF data
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//
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var pdf = new PDFDoc(new Stream(data));
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var page = pdf.getPage(1);
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var scale = 1.5;
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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.height = page.height * scale;
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canvas.width = page.width * scale;
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//
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// Render PDF page into canvas context
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//
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page.startRendering(context);
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});
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