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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
A line bisection task.
This example is appropriate to illustrates the use of the Android runtime environment for Exypriment on tablet PC.
"""
from expyriment import control, stimuli, io, design, misc
# settings
design.defaults.experiment_background_colour = misc.constants.C_GREY
design.defaults.experiment_foreground_colour = misc.constants.C_BLACK
line_length = 200
def line_bisection_task(line_length, position):
# make button
button = stimuli.Rectangle(size=(40,20),
position=(exp.screen.size[0]/2-25, 15-exp.screen.size[1]/2))
button_text = stimuli.TextLine(text="ok", position=button.position,
text_colour=misc.constants.C_WHITE)
mark_position = None
while True:
canvas = stimuli.BlankScreen()
line = stimuli.Rectangle(size=(line_length,3), position=position,
colour=misc.constants.C_BLACK)
line.plot(canvas)
if mark_position is not None:
# plot button and mark line on canvas
button.plot(canvas)
button_text.plot(canvas)
markline = stimuli.Rectangle(size=(1,25),
position=(mark_position, line.position[1]),
colour=misc.constants.C_RED)
markline.plot(canvas)
# present stimulus
canvas.present()
# wait for mouse or touch screen response
_id, pos, _rt = exp.mouse.wait_press()
# process clicked position position
if abs(pos[1]-line.position[1])<=50 and\
abs(pos[0]-line.position[0])<=line_length/2:
mark_position = pos[0]
else:
if button.overlapping_with_position(pos): # is button pressed
return mark_position - line.position[0]
### init ###
exp = control.initialize()
# create touch button box
buttonA = stimuli.Rectangle(size=(80, 40), position=(-60, 0))
buttonB = stimuli.Rectangle(size=(80, 40), position=(60, 0))
textA = stimuli.TextLine(text="quit", position=buttonA.position,
text_colour=misc.constants.C_WHITE)
textB = stimuli.TextLine(text="next", position=buttonB.position,
text_colour=misc.constants.C_WHITE)
touchButtonBox = io.TouchScreenButtonBox(button_fields=[buttonA, buttonB],
stimuli=[textA, textB])
### start ###
control.start(exp)
exp.mouse.show_cursor()
# trial loop
while True:
# find random position
rx, ry = ((exp.screen.size[0]-line_length)/2, (exp.screen.size[1]-50)/2)
pos = [design.randomize.rand_int(-rx, rx), design.randomize.rand_int(-ry, ry)]
# present task
judgment = line_bisection_task(line_length, position=pos)
# save data
exp.data.add(pos +[judgment])
# ask for new trail
touchButtonBox.show()
btn, _rt = touchButtonBox.wait()
if btn==buttonA:
break
## end##
control.end()
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