Rename GnuBook to BookReader

[bookreader.git] / BookReaderDemo / BookReaderJSSimple.js

diff --git a/BookReaderDemo/BookReaderJSSimple.js b/BookReaderDemo/BookReaderJSSimple.js
new file mode 100644 (file)
index 0000000..4d08470
--- /dev/null
+++ b/BookReaderDemo/BookReaderJSSimple.js
@@ -0,0 +1,84 @@
+// 
+// This file shows the minimum you need to provide to BookReader to display a book
+//
+// Copyright(c)2008-2009 Internet Archive. Software license AGPL version 3.
+
+// Create the BookReader object
+br = new BookReader();
+
+// Return the width of a given page.  Here we assume all images are 800 pixels wide
+br.getPageWidth = function(index) {
+    return 800;
+}
+
+// Return the height of a given page.  Here we assume all images are 1200 pixels high
+br.getPageHeight = function(index) {
+    return 1200;
+}
+
+// We load the images from archive.org -- you can modify this function to retrieve images
+// using a different URL structure
+br.getPageURI = function(index) {
+    var leafStr = '000';            
+    var imgStr = (index+1).toString();
+    var re = new RegExp("0{"+imgStr.length+"}$");
+    var url = 'http://www.archive.org/download/BookReader/img/page'+leafStr.replace(re, imgStr) + '.jpg';
+    return url;
+}
+
+// Return which side, left or right, that a given page should be displayed on
+br.getPageSide = function(index) {
+    if (0 == (index & 0x1)) {
+        return 'R';
+    } else {
+        return 'L';
+    }
+}
+
+// This function returns the left and right indices for the user-visible
+// spread that contains the given index.  The return values may be
+// null if there is no facing page or the index is invalid.
+br.getSpreadIndices = function(pindex) {   
+    var spreadIndices = [null, null]; 
+    if ('rl' == this.pageProgression) {
+        // Right to Left
+        if (this.getPageSide(pindex) == 'R') {
+            spreadIndices[1] = pindex;
+            spreadIndices[0] = pindex + 1;
+        } else {
+            // Given index was LHS
+            spreadIndices[0] = pindex;
+            spreadIndices[1] = pindex - 1;
+        }
+    } else {
+        // Left to right
+        if (this.getPageSide(pindex) == 'L') {
+            spreadIndices[0] = pindex;
+            spreadIndices[1] = pindex + 1;
+        } else {
+            // Given index was RHS
+            spreadIndices[1] = pindex;
+            spreadIndices[0] = pindex - 1;
+        }
+    }
+    
+    return spreadIndices;
+}
+
+// For a given "accessible page index" return the page number in the book.
+//
+// For example, index 5 might correspond to "Page 1" if there is front matter such
+// as a title page and table of contents.
+br.getPageNum = function(index) {
+    return index+1;
+}
+
+// Total number of leafs
+br.numLeafs = 15;
+
+// Book title and the URL used for the book title link
+br.bookTitle= 'Open Library Bookreader Presentation';
+br.bookUrl  = 'http://openlibrary.org';
+
+// Let's go!
+br.init();