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#!/usr/bin/env python
"""
A fixation cross stimulus.
This module contains a class implementing a fixation cross stimulus.
"""
__author__ = 'Florian Krause <florian@expyriment.org>, \
Oliver Lindemann <oliver@expyriment.org>'
__version__ = '0.7.0'
__revision__ = '55a4e7e'
__date__ = 'Wed Mar 26 14:33:37 2014 +0100'
import defaults
from _shape import Shape
import expyriment
class FixCross(Shape):
"""A class implementing a general fixation cross."""
def __init__(self, size=None, position=None, line_width=None,
colour=None, anti_aliasing=None, cross_size=None):
"""Create a fixation cross.
Parameters
----------
size : (int, int), optional
size of the cross
position : (int, int), optional
position of the stimulus
line_width : (int, int), optional
width of the lines
colour : (int, int), optional
colour of the cross
anti_aliasing : (int, int), optional
anti aliasing parameter
cross_size : (int, int) DEPRECATED argument
please use 'size' and specify x and y dimensions.
"""
if cross_size is not None and size is None:
size = (cross_size, cross_size)
if position is None:
position = defaults.fixcross_position
if colour is None:
colour = defaults.fixcross_colour
if colour is not None:
self._colour = colour
else:
self._colour = expyriment._active_exp.foreground_colour
if anti_aliasing is None:
anti_aliasing = defaults.fixcross_anti_aliasing
Shape.__init__(self, position=position, colour=colour,
anti_aliasing=anti_aliasing)
if size is None:
size = defaults.fixcross_size
if line_width is None:
line_width = defaults.fixcross_line_width
self._size = size
self._line_width = line_width
x = (self._size[0] - line_width) / 2
y = (self._size[1] - line_width) / 2
self.add_vertex((line_width, 0))
self.add_vertex((0, -y))
self.add_vertex((x, 0))
self.add_vertex((0, -line_width))
self.add_vertex((-x, 0))
self.add_vertex((0, -y))
self.add_vertex((-line_width , 0))
self.add_vertex((0, y))
self.add_vertex((-x, 0))
self.add_vertex((0, line_width))
self.add_vertex((x, 0))
@property
def size(self):
"""Getter for size."""
return self._size
@property
def cross_size(self):
"""DEPRECATED getter, please use size"""
return self.size
@property
def line_width(self):
"""Getter for line_width."""
return self._line_width
if __name__ == "__main__":
from expyriment import control
control.set_develop_mode(True)
defaults.event_logging = 0
exp = control.initialize()
fixcross = FixCross(size=(100, 100))
fixcross.present()
exp.clock.wait(1000)
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