add app folder

app/pub/scripts/anpdf.js

@@ -0,0 +1,42 @@
+   // If absolute URL from the remote server is provided, configure the CORS
+// header on that server.
+
+// Loaded via <script> tag, create shortcut to access PDF.js exports.
+var pdfjsLib = window['pdfjs-dist/build/pdf'];
+
+// The workerSrc property shall be specified.
+pdfjsLib.GlobalWorkerOptions.workerSrc = '//mozilla.github.io/pdf.js/build/pdf.worker.js';
+
+// Asynchronous download of PDF
+var loadingTask = pdfjsLib.getDocument(url);
+loadingTask.promise.then(function(pdf) {
+  console.log('PDF loaded');
+  
+  // Fetch the first page
+  
+  pdf.getPage(pageNumber).then(function(page) {
+    console.log('Page loaded');
+    
+    
+    var viewport = page.getViewport({scale: scale});
+
+    // Prepare canvas using PDF page dimensions
+    var canvas = document.getElementById('the-canvas');
+    var context = canvas.getContext('2d');
+    canvas.height = viewport.height;
+    canvas.width = viewport.width;
+
+    // Render PDF page into canvas context
+    var renderContext = {
+      canvasContext: context,
+      viewport: viewport
+    };
+    var renderTask = page.render(renderContext);
+    renderTask.promise.then(function () {
+      console.log('Page rendered');
+    });
+  });
+}, function (reason) {
+  // PDF loading error
+  console.error(reason);
+});