[visionegg] Re: collecting keyboard input

A quick example (edited displayText.py):
#!/usr/bin/env python
"""Display text strings."""

import VisionEgg
VisionEgg.start_default_logging(); VisionEgg.watch_exceptions()

from VisionEgg.Core import *
from VisionEgg.FlowControl import Presentation
from VisionEgg.Text import *
import sys

screen = get_default_screen()
screen.parameters.bgcolor = (0.0,0.0,1.0) # background blue (RGB)

text = Text(text="",anchor='center',position=(screen.size[0]/2,screen.size[1]/ 2))

viewport = Viewport(screen=screen,size=screen.size,stimuli=[text])

def keydown(event) :
    global text
    if event.key == pygame.locals.K_ESCAPE :
        sys.exit()
    elif event.key == pygame.locals.K_RETURN :
        print text.parameters.text
        text.parameters.text=""
    elif event.key == pygame.locals.K_BACKSPACE :
        text.parameters.text=text.parameters.text[:-1]
    else :
        text.parameters.text+=event.unicode

p = Presentation(go_duration=('forever',),viewports=[viewport])
p.parameters.handle_event_callbacks = [(pygame.locals.QUIT, sys.exit),
(pygame.locals.KEYDOWN, keydown)]
p.go()
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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