PyGaze with Pyglet

jlda

Hi all,

I have a stimulus code that uses the Pyglet library to create and animate some OpenGL figures. I would like to use an EyeTracker to synchronize with the stimulus and then get the eye gaze data.

I understand that PyGaze is already prepared for PsychoPy and PyGame. Since I have the stimulus in Pyglet, I believe that I would have to modify the libscreen, libtime and libinput libraries.

Is modifying these files the only solution? Has anybody used Pyglet with PyGaze?

Thank you,
jl

Edwin

Hi jl,

There are two options:

1) Rewrite Display and Screen (and possibly Keyboard and Mouse). Basically, this means implementing all the existing functionality (provided through PyGame and PsychoPy) by wrapping Pyglet.

2) Use the EyeTracker class with an active PyGaze Display under the PsychoPy display type, then hijack the Pyglet window. The recipe would be fairly straightforward:

constants.py

# set the display size to the same display size as your 
DISPSIZE = (1920,1080)
# important: set the display type to 'psychopy'!
DISPTYPE = 'psychopy'
# set the tracker type to the type of your choice
TRACKERTYPE = 'eyetribe'

# you can add more stuff here, to overwrite the defaults

experiment.py

import pygaze
from pygaze.display import Display
from pygaze.eyetracker import EyeTracker

# initialize a Display
disp = Display()
# create a new EyeTracker instance
tracker = EyeTracker(disp)

# get the handle to the pyglet window
pygletwin = pygaze.expdisplay.winHandle

# next do whatever you want with the Pyglet handle!

Good luck!

jlda

Hi Edwin,

Thank you very much for your answer.

I have tried to put the second option in practice, but I have not succeeded. I understand that
pygletwin = pygaze.expdisplay.winHandle

will create a pyglet window, but I have not found any documentation on how to use it.

Following the code in your answer, I have tried to make something simple as to display a square on the screen, but the screen remains empty and there is no error message.

This is the code I am using:

import pygaze
from pygaze.libscreen import Display
from pygaze.eyetracker import EyeTracker
from pygaze.libinput import Keyboard
import pyglet
from pyglet.gl import *
from random import random

def main():
    # initialize a Display
    disp = Display()

    # create a new EyeTracker instance
    tracker = EyeTracker(disp)

    # calibrate eye tracker
    tracker.calibrate()

    # get the handle to the pyglet window
    pygletwin = disp.expdisplay.winHandle

    kb = Keyboard(keylist=['space'],timeout=None)
    x = pygletwin.width/2
    y = pygletwin.height/2
    w = 3000

    color = (1,1,1)

    # next do whatever you want with the Pyglet handle!
    while kb.get_key()[0] == None:

        pyglet.graphics.draw(4, pyglet.gl.GL_QUAD, 
                    ('v2i', (x-w, y-w, x-w, y+w, x+w, y-w, x+w, y+w)),                                                                                  # position of each vertices
                    ('c3B', (color[0], color[1], color[2], color[0], color[1], color[2], color[0], color[1], color[2], color[0], color[1], color[2]))   # color of each vertex                  
                    )   
        pygletwin.dispatch_events()
        pygletwin.clear()
        pygletwin.flip()
        pass

    pygletwin.close()

if __name__=='__main__':
    main()

Thanks for your help.

Edwin

Could it be because you call pygletwin.clear() before calling pygletwin.flip()?

You mention you already have the Pyglet code for your stimulus, so I assumed you were familiar with it's Window class. I am not, but I did find some documentation here.

Good luck!

jlda

Hi Edwin,

Thank you for your answer.

I made the following mistake (but I have not solved my problem): nothing was being drawn because the pyglet.clear() call was after drawing the square. Now the while loop looks like this:

def my_function():
    while kb.get_key()[0] == None:

        pygletwin.dispatch_events()     # dispatch events of pyglet window
        pygletwin.clear()               # clear pyglet window

        pyglet.graphics.draw(4, pyglet.gl.GL_QUADS,             # draw square 
                    ('v2i', (x-w, y-w, x-w, y+w, x+w, y-w, x+w, y+w)),
                    )   

        pygletwin.flip()        # flip pyglet window
        pass

When pygletwin is initialzed as a normal pyglet window, i.e. pygletwin = pyglet.window.Window(), the square is drawn. However, when I use pygletwin = disp.expdisplay.winHandle, nothing is drawn.

I am more or less familiar with the Pyglet Window class, but, sorry, I was not clear that I was refering to the winHandle method, that I believe it is a method of the PsychoPy window, but I have not found any documentation at all.

Thank you very much for your help, I really appreciate it.

jl