[visionegg] Re: collecting keyboard input

Alessandro -

Visionegg is based on Pygame and is a library for python, so anything you can program, you can do in Visionegg. I haven't used PyEPL, so I really don't know how that experience compares to Visionegg.

It shouldn't be too difficult to make the subject's response show up on the screen as they type it. You will have to program it yourself, however, as visionegg doesn't have a specific class for handling such cases. You'll want to look at the Text class (as Chao Tang pointed out). Essentially, you'll have to read the keypresses with a handler and change the text parameter of a Text class object.

Check out the demos: displayText.py shows how to display text, gamma.py shows how to handle responses with pygame, or you can look into using demo_keyboardresponse.py.

The best way to try visionegg is to install it and get your feet wet with the demos. Once you get an idea of how they work, you can look at the library reference, which will help you the most. If you really need to figure something out, check out the source, it's the advantage of using an open source project to program your stimuli.

Demos:
from http://www.visionegg.org/Download_and_Install :
http://prdownloads.sourceforge.net/visionegg/visionegg-1.0- demos.tar.gz?download
Library Reference:
http://visionegg.org/reference/index.html
Source (you'll install it, so you have your own copy, but you can look at the current version here):
http://visionegg.org/cgi-bin/viewcvs.cgi/trunk/visionegg

Pygame.event docs may be relevant, particularly keydown:
http://www.pygame.org/docs/ref/event.html

Mark

On May 9, 2006, at 4:19 PM, Alessandro Gagliardi wrote:

I haven't touched Vision Egg yet, so forgive me my ignorant questions but: how hard would it be to echo that input on the screen?  I ask because in PyEPL (which I have been using), to repeatedly update the screen with every key press is a bit of a pain.  It's not like you can have a textbox with the input fed from the keyboard, like you might be able to in other systems.  How is it in Vision Egg?  (And for the record, I did take a look at the documentation on the website and I didn't see anything about tracking key presses.  Though perhaps I didn't look hard enough.)

Thanks!
-Alessandro

On 5/9/06, Chao Tang <tang@xxxxxxxxxxx> wrote:Hi, 
 
You may use pygame.event to get what you want...see code snap bellow.
 
import pygame
 
# get one key press
for event in pygame.event.get():
   # event.type and event.key are ready for you to use
   if event.type == pygame.KEYDOWN:
      ...          
   if event.type == pygame.KEYUP:
      ...
 
HTH.

 
Chao

 
-----Original Message-----
From: visionegg-bounce@xxxxxxxxxxxxx [mailto:visionegg-bounce@xxxxxxxxxxxxx]On Behalf Of Alessandro Gagliardi
Sent: Tuesday, May 09, 2006 3:09 PM
To: visionegg@xxxxxxxxxxxxx
Subject: [visionegg] collecting keyboard input

Hello Vision Egg users,

I'm currently designing an experiment in which I want to collect keyboard input from a participant typing one word answers to questions.  Obviously, I would like their input echoed on the screen.  Is there an easy way to do this with Vision Egg?  There is no way in the software that I'm currently using, so I'm thinking of switching.

Thanks in advance,
--
Alessandro Gagliardi
Integrative Neuroscience
Rutgers University
alessandro@xxxxxxxxxxxxxx



--
Alessandro Gagliardi
Integrative Neuroscience
Rutgers University
alessandro@xxxxxxxxxxxxxx

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