fixes #24 support setting zoom level

lib/rasterize/rasterize.js

@@ -2,8 +2,8 @@ var page = require('webpage').create();
 var system = require('system');
 var address, output, size;
 
-if (system.args.length < 3 || system.args.length > 6) {
-	console.log('Usage: rasterize.js URL filename paperwidth*paperheight|paperformat portrait|landscape margin');
+if (system.args.length < 3 || system.args.length > 7) {
+	console.log('Usage: rasterize.js URL filename paperwidth*paperheight|paperformat portrait|landscape margin zoomfactor');
 	console.log('  paperwidth*paperheight|paperformat examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
 	console.log('  margin examples: "1cm", "2in"');
 	phantom.exit(1);
@@ -17,7 +17,7 @@ if (system.args.length < 3 || system.args.length > 6) {
 		size.length === 2 ?
 		{ width: size[0], height: size[1], orientation: system.args[4], margin: system.args[5] } :
 		{ format: system.args[3], orientation: system.args[4], margin: system.args[5] };
-
+    page.zoomFactor = Number(system.args[6]);
 	var statusCode;
 
 	page.onResourceReceived = function (resource) {

lib/webservices/pdf.js

@@ -17,6 +17,7 @@ if (process.platform !== 'darwin') {
 var FORMATS = ['A3', 'A4', 'A5', 'Legal', 'Letter', 'Tabloid'];
 var ORIENTATIONS = ['portrait', 'landscape'];
 var marginRegExp = /^\d+(in|cm|mm)$/;
+var zoomRegExp = /^\d(\.\d{1,3})?$/;
 
 module.exports = function (app) {
 	app.get('/', function (req, res, next) {
@@ -45,6 +46,11 @@ module.exports = function (app) {
 		if(!marginRegExp.test(margin)){
 			return res.status(400).send(format('Invalid margin, the following formats are supported: 0cm, 1cm, 2cm, 1in, 13mm'));
 		}
+		var zoom = req.query.zoom || '1';
+		if(!zoomRegExp.test(zoom)){
+			return res.status(400).send(format('Invalid zoom, the following kind of formats are supported: 1, 0.5, 9.25, 0.105'));
+		}
+
 		request.head(url, function (err, resp) {
 			if (err) {
 				return res.status(400).send(format('Cannot get %s: %s', url, err.message));
@@ -73,7 +79,8 @@ module.exports = function (app) {
 					tmpFile,
 					paperFormat,
 					orientation,
-					margin
+					margin,
+					zoom
 				];
 				var pdfProcess = spawn(pdfExecutable, options);
 				pdfProcess.stdout.on('data', function (data) {

public/index.html

@@ -303,6 +303,11 @@ <h2>Querystring parameters</h2>
 				<td>portrait | landscape</td>
 				<td>The page orientation of the pdf generated</td>
 			</tr>
+			<tr>
+				<td><code>zoom</code></td>
+				<td>1 | 0.1 | 0.25 | 3.75 | 5.125</td>
+				<td>The zoom factor of the page. This makes the content larger or smaller.</td>
+			</tr>
 			<tr>
 				<td><code>download</code></td>
 				<td>true | false</td>