Creating your own stimuli in Python

Every mPsy stimulus contains at least two elements: function draw() and field params. The latter is an associative array: a fundamental object type such as struct in MATLAB and named list in R.

A definition of stimulus in mPsy is illustrated just below using stimulus Text, a simple yet functional example of text label:

from pyglet import text

class Text:
    def __init__(self,**params):
        self.params = Params(\**params)
        self.text = text.Label(self.params.msg,anchor_x='center',halign='center')
    def draw(self):
        self.text.draw()

Each mPsy stimulus [is an independent program], for which several examples appear module stimuli.py. The examples in stimuli.py (and the one above) can be used outside of mPsy, which is useful for the developing your own stimuli.

The following code shows how to set up a window and call the draw() function for an mPsy stimulus.

from pyglet import text

class Text:
    def __init__(self,\**params):
        print params
        self.params = Params(\**params)
        self.text = text.Label(self.params.msg,halign='center',anchor_x='center')
    def draw(self):
        self.text.draw()

if __name__ == "__main__":
    import sys
    sys.path[:0] = ['packages.zip']

    from pyglet.gl import *
    from pyglet.window import key
    from pyglet import clock, clock, font, graphics, window, text

    class Params:
        def __init__(self,**kwargs):
            self.__dict__.update(kwargs)
        def update(self,**kwargs):
            self.__dict__.update(kwargs)
        def __str__(self):
            return '\n'.join( '%s = %s'%x for x in self.__dict__.items() )
        def __repr__(self):
            return 'Params(%s)'%(', '.join( '%s=%s'%x for x in self.__dict__.items() ),)
        def default(self):
            return self.__dict__

    win = window.Window()
    stim = Text(msg='Welcome to Movable Psychophysics.')

    def update(dt):
        win.clear()
        glPushMatrix()
        glTranslatef(320,240,0)
        stim.draw()
        glPopMatrix()

    clock.schedule_interval(update,1/60.0)
    pyglet.app.run()