version 0.1.2 of the web API

* added an optional parameter "output", accepted values: "json"(default)|"png"

If output=png is specified, the service will redirect directly to the plot
image.  This is an easy way to use gpxplot almost anywere. You can embed
profile plots as ordinary images into any web page.

For example:

<img src="http://gpxplot.appspot.com/api/0.1.2/plot?gpxurl=URL_OF_YOUR_GPX_FILE&output=png" alt="Elevation profile" width="600" height="400">

Author: s.astanin

online/index.py

@@ -73,16 +73,23 @@ def get(self):
 	def post(self):
 		try:
 			url=plot_on_request(self.request)
-			self.response.headers['Content-Type']='application/json'
-			self.response.out.write(json.dumps({'url':url}))
+			format=self.request.get("output","json")
+			if format == "json":
+				self.response.headers['Content-Type']='application/json'
+				self.response.out.write(json.dumps({'url':url}))
+			elif format == "png":
+				self.redirect(url)
+			else:
+				raise Exception("Output format not supported.")
 		except Exception, e:
 			self.response.set_status(400,message='Exception: '+unicode(e))
 
 application = webapp.WSGIApplication(
 		 [('/', MainPage),
 		  (r'/api/0.1/plot',ApiHandler),
-		  (r'/api/0.1.1/plot',ApiHandler)],
-		 debug=True)
+		  (r'/api/0.1.1/plot',ApiHandler),
+		  (r'/api/0.1.2/plot',ApiHandler),
+		 ], debug=True)
 
 def main():
 	run_wsgi_app(application)