Single mouse click within While loop (PsychoPy)

Question

I am using PsychoPy and I would like to print the position of my mouse when it has been clicked.

The actual printing of the position needs to be placed inside a while loop. Using the code below, when I click I get more than one output lines, which print the same positions. I would like to have only one output printing for each click.

This is the code I am using:

#!/usr/bin/env python2
from psychopy import visual, core, event
from pyglet.gl import *

width = 600
height = 600
myWin = visual.Window([width,height], color='white',units='pix',monitor='testMonitor')

#This will set the windows units (pixels) to GL units
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(0, width, 0, height, -1, 1)

glMatrixMode(GL_MODELVIEW)
glLoadIdentity()

glEnable(GL_BLEND)
glBlendFunc(GL_ZERO, GL_SRC_COLOR)

myMouse = event.Mouse()  #  will use myWin by default


while True:
    #Triangle left
    glColor3f(1.0, 0.0, 0.0)
    glBegin(GL_TRIANGLES)
    glVertex3f(150, 550, 1)
    glVertex3f(50, 350, 1)
    glVertex3f(250, 350, -1)
    glEnd()

    if myMouse.getPressed()[0]:
        myMouse.clickReset()
        print myMouse.getPos()

    myWin.flip()

core.quit()

Is there something wrong I am doing? Should the 'frame rate' of the while loop be changed?

Answer 1

I've not used the module, but it seems like mouse events are thrown for mouse raises as well.

You'll need to

• Store the mouse state for next time

• Each iteration, test whether the mouse state for button 0 has gone up → down

The mouse state is returned by myMouse.getPressed.

So something like:

oldMouseIsDown = False

while True:
    ...

    mouseIsDown = myMouse.getPressed()[0]
    myMouse.clickReset()

    if mouseIsDown and not oldMouseIsDown:
        print myMouse.getPos()

    oldMouseIsDown = mouseIsDown