Prerendering of GUI for voting machines

From: Alan Dechert <dechert_at_gmail_dot_com>
Date: Fri Nov 30 2007 - 02:36:10 CST

I attended a talk by Ka-Ping Yee today (well, yesterday, actually, since
it's now morning) at UC Berkeley. "Ping," talked about how much of the
computer code used in computerized voting interfaces could be eliminated by
prerendering. He has written code for a DRE that consists of only 640 lines
of Python code, in contrast to 10's of thousands (or even 100s of thousands)
of lines that the usual vendors have been selling.

All of this sounded pretty familiar. In fact, we used a prerendered GUI for
our demo in 2004. OVS has carried on by using prerendered screens in their
designs. Prerendering has enabled OVC and OVS to get something done with
very little code.

Before seeing what OVS had come up with, I did not think of prerendering as
a way to make a better voting system with less code. OVC used prerendering
just to get the thing done. I never intended the demo to be done that way!

Have a look at our page on Sourceforge:

and check out the architecture link ...

Note the picture of the ballot:

I created this in a painting program just to show developers what I wanted
to see. It turns out that this picture became the interface by putting
Python code behind it to capture clicks (or touches) on the screen at the
circles where choices are to be indicated.

This is in contrast to our web demo (where the screen is rendering by the
browser ).

I'm not sure who first suggested we use the prerendered screen for the OVC
standalone demo -- maybe Fred McLain, David Mertz, or Jean-Paul Gignac.
This may have been a key feature of our demo that we did not advertise.

Ping explains the advantages of prerendering in some detail.... sounds like
the way to go.

Alan D.

OVC-discuss mailing list
By sending email to the OVC-discuss list, you thereby agree to release the content of your posts to the Public Domain--with the exception of copyrighted material quoted according to fair use, including publicly archiving at
= The content of this message, with the exception of any external
= quotations under fair use, are released to the Public Domain
Received on Fri Nov 30 23:17:30 2007

This archive was generated by hypermail 2.1.8 : Fri Nov 30 2007 - 23:17:32 CST