[visionegg] Re: change the texture parameter of a texture object inthe main loop

shame to me...


I need to use the 'parameters' attribute
stimulus.parameters.texture = preloaded_texture_list[i]

and not:
 
stimulus.texture = preloaded_texture_list[i]

one cannot set the "texture" attribute directly

c

On Tue, 2003-04-15 at 14:22, Christoph Lehmann wrote:
> Hi Andrew
> (I know it must be an easy question, but I didn't solve it myself so
> far.. :)
> ------------------------
> in the code below:
> 
> I have a preloaded_texture_list  with textures from files loaded.
> The TextureStimulus object, linked to the viewport is called in the main
> loop, since there I want to change the texture-parameter after each
> received trigger signal.
> But I didn't succeed.. (well the code runs,but it doesn't change the
> textures..)
> before I enter the main loop, I define a TextureStimulus object (for
> afterward linking to the viewport): do I need there to specify the
> texture-parameter already?
> 
> thanks a lot
> 
> christoph
> 
> Cooooooooooooooooooooooooooooode:
> 
> 
> 
> #!/usr/bin/env python
> 
> #This bypasses the VisionEgg.Core.Presentation class.  It may be easier
> #to create simple experiments this way."""
> 
> import VisionEgg
> from VisionEgg.Core import *
> import pygame
> from pygame.locals import *
> from VisionEgg.Text import *
> 
> 
> from random import *
> import VisionEgg.Daq
> from VisionEgg.DaqLPT import *
> from VisionEgg.Textures import *
> 
> 
> screen = get_default_screen()
> screen.parameters.bgcolor = (0.0,0.0,0.0,0.0) # black (RGBA)
> 
> 
> path =
> "/home/christoph/work/programming/my_ve_projects/load_picture/data/"
> #the path the images are in
> 
> photo = []
> photoX = []
> 
> # present them in random order
> for filename in os.listdir(path):
>     photo.append(filename)
> length = len(photo)
> for i in range(0, length):
>     ran = randint(0, len(photo)-1)
>     file = photo[ran]
>     photoX.append(file)
>     photo.pop(ran)
> 
> os.chdir(path)
> 
> num_images = len(photoX)
> 
> # Create list of stimuli
> preloaded_texture_list = [] # empty at first
> for i in range(num_images):
>     # Read the texture file
>     texture = TextureFromFile(photoX[i])
> 
>     # Add to list of stimuli
>     preloaded_texture_list.append( texture )
> #
> 
> x = screen.size[0]/2 - preloaded_texture_list[0].size[0]/2
> y = screen.size[1]/2 - preloaded_texture_list[0].size[1]/2
> stimulus = TextureStimulus(on = 1,
>                            texture = preloaded_texture_list[0],
>                            size = preloaded_texture_list[0].size,
>                            lowerleft=(x,y))
> 
> viewport = Viewport( screen=screen, stimuli=[stimulus] )
> 
> # The main loop below is an alternative to using the
> # VisionEgg.Core.Presentation class.
> 
> i = 1
> while not pygame.event.peek((QUIT,KEYDOWN,MOUSEBUTTONDOWN)):  
>     # poll the LPT for the TTL trigger, sent by the MR scanner
>     input_value = 0
>  
>     while (input_value == 0):
>         input_value = raw_lpt_module.inp(0x379) & 0x20 # pin nr 12
> 
>     stimulus.texture = preloaded_texture_list[i]
> 
>     screen.clear()
>     viewport.draw()
>     swap_buffers()
>     if i == num_images - 1:
>         i = 0
>     else: 
>         i = i + 1
> 
> -- 
> Christoph Lehmann                            Phone:  ++41 31 930 93 83 
> Department of Psychiatric Neurophysiology    Mobile: ++41 76 570 28 00
> University Hospital of Clinical Psychiatry   Fax:    ++41 31 930 99 61 
> Waldau                                            lehmann@xxxxxxxxxxxx 
> CH-3000 Bern 60            http://www.puk.unibe.ch/cl/pn_ni_cv_cl.html
> 
> ======================================
> The Vision Egg mailing list
> Archives: http://www.freelists.org/archives/visionegg
> Website: http://www.visionegg.org/mailinglist.html
-- 
Christoph Lehmann                            Phone:  ++41 31 930 93 83 
Department of Psychiatric Neurophysiology    Mobile: ++41 76 570 28 00
University Hospital of Clinical Psychiatry   Fax:    ++41 31 930 99 61 
Waldau                                            lehmann@xxxxxxxxxxxx 
CH-3000 Bern 60            http://www.puk.unibe.ch/cl/pn_ni_cv_cl.html

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