new phantom pdf export script that works with 3.4.0 #1815

plugin/print-pdf/print-pdf.js

@@ -4,30 +4,15 @@
  * Example:
  * phantomjs print-pdf.js "http://lab.hakim.se/reveal-js?print-pdf" reveal-demo.pdf
  *
- * By Manuel Bieh (https://github.com/manuelbieh)
+ * @author Manuel Bieh (https://github.com/manuelbieh)
+ * @author Hakim El Hattab (https://github.com/hakimel)
  */
 
 // html2pdf.js
-var page = new WebPage();
 var system = require( 'system' );
 
-var slideWidth = system.args[3] ? system.args[3].split( 'x' )[0] : 960;
-var slideHeight = system.args[3] ? system.args[3].split( 'x' )[1] : 700;
-
-page.viewportSize = {
-	width: slideWidth,
-	height: slideHeight
-};
-
-// TODO
-// Something is wrong with these config values. An input
-// paper width of 1920px actually results in a 756px wide
-// PDF.
-page.paperSize = {
-	width: Math.round( slideWidth * 2 ),
-	height: Math.round( slideHeight * 2 ),
-	border: 0
-};
+var probePage = new WebPage();
+var printPage = new WebPage();
 
 var inputFile = system.args[1] || 'index.html?print-pdf';
 var outputFile = system.args[2] || 'slides.pdf';
@@ -36,13 +21,31 @@ if( outputFile.match( /\.pdf$/gi ) === null ) {
 	outputFile += '.pdf';
 }
 
-console.log( 'Printing PDF (Paper size: '+ page.paperSize.width + 'x' + page.paperSize.height +')' );
+console.log( 'Export PDF: Reading reveal.js config [1/3]' );
+
+probePage.open( inputFile, function( status ) {
+
+	console.log( 'Export PDF: Preparing print layout [2/3]' );
+
+	var config = probePage.evaluate( function() {
+		return Reveal.getConfig();
+	} );
+
+	printPage.paperSize = {
+		width: config.width * ( 1 + config.margin ),
+		height: config.height * ( 1 + config.margin ),
+		border: 0
+	};
+
+	printPage.open( inputFile, function( status ) {
+		window.setTimeout( function() {
+			console.log( 'Export PDF: Writing file [3/3]' );
+			printPage.render( outputFile );
+			console.log( 'Export PDF: Finished successfully!' );
+			phantom.exit();
+		}, 1000 );
+	} );
 
-page.open( inputFile, function( status ) {
-	window.setTimeout( function() {
-		console.log( 'Printed successfully' );
-		page.render( outputFile );
-		phantom.exit();
-	}, 1000 );
 } );
 
+