def level_indicator(value,
text,
scaling,
width=20,
text_size=14,
text_gap=20,
position=(0, 0),
thresholds=None,
colour=constants.C_EXPYRIMENT_ORANGE):
"""make an level indicator in for of an Expyriment stimulus
text_gap: gap between indicator and text
scaling: Scaling object
Returns
--------
expyriment.Canvas
"""
value = scaling.trim(value)
# indicator
height = scaling.pixel_max - scaling.pixel_min
indicator = Canvas(size=[width + 2, height + 2], colour=(30, 30, 30))
zero = scaling.data2pixel(0)
px_bar_height = scaling.data2pixel(value) - zero
bar = Rectangle(size=(width, abs(px_bar_height)),
position=(0, zero + int((px_bar_height + 1) / 2)),
colour=colour)
bar.plot(indicator)
# levels & horizontal lines
try:
px_horizontal_lines = scaling.data2pixel(
values=np.array(thresholds.thresholds))
except:
px_horizontal_lines = None
if px_horizontal_lines is not None:
for px in px_horizontal_lines:
level = Rectangle(size=(width + 6, 2),
position=(0, px),
colour=constants.C_WHITE)
level.plot(indicator)
# text labels
txt = TextLine(text=text,
text_size=text_size,
position=(0, -1 * (int(height / 2.0) + text_gap)),
text_colour=constants.C_YELLOW)
# make return canvas
w = max(txt.surface_size[0], indicator.size[0])
h = height + 2 * (txt.surface_size[1]) + text_gap
rtn = Canvas(size=(w, h), colour=(0, 0, 0), position=position)
indicator.plot(rtn)
txt.plot(rtn)
return rtn
def level_indicator(value, text, scaling, width=20,
text_size=14, text_gap=20, position=(0,0), thresholds = None,
colour=constants.C_EXPYRIMENT_ORANGE):
"""make an level indicator in for of an Expyriment stimulus
text_gap: gap between indicator and text
scaling: Scaling object
Returns
--------
expyriment.Canvas
"""
value = scaling.trim(value)
# indicator
height = scaling.pixel_max - scaling.pixel_min
indicator = Canvas(size=[width + 2, height + 2],
colour=(30, 30, 30))
zero = scaling.data2pixel(0)
px_bar_height = scaling.data2pixel(value) - zero
bar = Rectangle(size=(width, abs(px_bar_height)),
position=(0, zero + int((px_bar_height + 1) / 2)),
colour=colour)
bar.plot(indicator)
# levels & horizontal lines
try:
px_horizontal_lines = scaling.data2pixel(values=np.array(thresholds.thresholds))
except:
px_horizontal_lines = None
if px_horizontal_lines is not None:
for px in px_horizontal_lines:
level = Rectangle(size=(width+6, 2),
position=(0, px),
colour=constants.C_WHITE)
level.plot(indicator)
# text labels
txt = TextLine(text=text, text_size=text_size,
position=(0, -1 * (int(height / 2.0) + text_gap)),
text_colour=constants.C_YELLOW)
# make return canvas
w = max(txt.surface_size[0], indicator.size[0])
h = height + 2 * (txt.surface_size[1]) + text_gap
rtn = Canvas(size=(w, h), colour=(0, 0, 0), position=position)
indicator.plot(rtn)
txt.plot(rtn)
return rtn
def __init__(self, dot_array,
position=(0, 0),
colours = _colour.ImageColours(),
antialiasing=True):
if not isinstance(colours, _colour.ImageColours):
raise ValueError("Colours must be a ImageColours instance")
_Canvas.__init__(self, size=(0, 0), position=position)
self.dot_array = dot_array
self.colours = colours
self.antialiasing = antialiasing
self._image = None
def scramble(self, grain_size):
self.unlock_pixel_array()
return Canvas.scramble(self, grain_size)
def flip(self, booleans):
self.unlock_pixel_array()
return Canvas.flip(self, booleans)
def rotate(self, degree):
self.unlock_pixel_array()
return Canvas.rotate(self, degree)
def copy(self):
self.unlock_pixel_array()
return Canvas.copy(self)
def plot(self, stimulus):
self.unlock_pixel_array()
return Canvas.plot(self, stimulus)
def preload(self, inhibit_ogl_compress=False):
self.unlock_pixel_array()
return Canvas.preload(self, inhibit_ogl_compress)
def plot(self, stimulus):
self.unlock_pixel_array()
return Canvas.plot(self, stimulus)
def decompress(self):
self.unlock_pixel_array()
return Canvas.decompress(self)
def preload(self, inhibit_ogl_compress=False):
self.unlock_pixel_array()
return Canvas.preload(self, inhibit_ogl_compress)
def __init__(self,
area_radius,
n_dots,
target_direction,
target_dot_ratio,
position=None,
dot_speed=None,
dot_lifetime=None,
dot_radius=None,
dot_colour=None,
background_colour=None,
north_up_clockwise=None):
"""Create a Random Dot Kinematogram
Parameters:
-----------
area_radius : int
the radius of the stimulus area
n_dots : int
number of moving dots
target_direction : int, float (0-360)
movement target direction in degrees
target_dot_ratio : float (0-1)
ratio of dots that move consistently in the same target direction
(the rest of the target moves in a random direction)
can be sometimes only approximated! self.target_dot_ratio returns the
precise actual target dot ratio
position : (int, int), optional
position of the stimulus
dot_speed : int, optional
the moving speed in pixel per second (default=100)
dot_lifetime : int, optional
the time the object lives in milliseconds (default 400)
dot_radius : int, optional
radius of the dots (default = 3)
dot_colour : (int, int, int), optional
colour (RGB) of the dots (default=experiment.foreground_colour)
background_colour : (int, int, int), optional
colour (RGB) of the background (default=experiment.background_colour)
north_up_clockwise : bool, optional
if true (default) all directional information refer to an
north up and clockwise system
otherwise 0 is right, counterclockwise (default=True)
Notes:
------
Logging is switch off per default
"""
if dot_speed is None:
dot_speed = defaults.randomdotkinematogram_dot_speed
if dot_lifetime is None:
dot_lifetime = defaults.randomdotkinematogram_dot_lifetime
if dot_radius is None:
dot_radius = defaults.randomdotkinematogram_dot_radius
if dot_colour is None:
dot_colour = defaults.randomdotkinematogram_dot_colour
if north_up_clockwise is None:
north_up_clockwise = defaults.randomdotkinematogram_north_up_clockwise
if position is None:
position = defaults.randomdotkinematogram_position
if background_colour is None:
background_colour = defaults.randomdotkinematogram_background_colour
self.area_radius = area_radius
self.dot_speed = dot_speed
self.dot_lifetime = dot_lifetime
self.dot_radius = dot_radius
self.dot_colour = dot_colour
self.north_up_clockwise = north_up_clockwise
self._canvas = Canvas(size=(2 * (self.area_radius + self.dot_radius),
2 * (self.area_radius + self.dot_radius)),
position=position,
colour=background_colour)
self.reset(n_dots=n_dots,
target_direction=target_direction,
target_dot_ratio=target_dot_ratio)
self.set_logging(False)
class RandomDotKinematogram(Stimulus):
"""Random Dot Kinematogram"""
def __init__(self,
area_radius,
n_dots,
target_direction,
target_dot_ratio,
position=None,
dot_speed=None,
dot_lifetime=None,
dot_radius=None,
dot_colour=None,
background_colour=None,
north_up_clockwise=None):
"""Create a Random Dot Kinematogram
Parameters:
-----------
area_radius : int
the radius of the stimulus area
n_dots : int
number of moving dots
target_direction : int, float (0-360)
movement target direction in degrees
target_dot_ratio : float (0-1)
ratio of dots that move consistently in the same target direction
(the rest of the target moves in a random direction)
can be sometimes only approximated! self.target_dot_ratio returns the
precise actual target dot ratio
position : (int, int), optional
position of the stimulus
dot_speed : int, optional
the moving speed in pixel per second (default=100)
dot_lifetime : int, optional
the time the object lives in milliseconds (default 400)
dot_radius : int, optional
radius of the dots (default = 3)
dot_colour : (int, int, int), optional
colour (RGB) of the dots (default=experiment.foreground_colour)
background_colour : (int, int, int), optional
colour (RGB) of the background (default=experiment.background_colour)
north_up_clockwise : bool, optional
if true (default) all directional information refer to an
north up and clockwise system
otherwise 0 is right, counterclockwise (default=True)
Notes:
------
Logging is switch off per default
"""
if dot_speed is None:
dot_speed = defaults.randomdotkinematogram_dot_speed
if dot_lifetime is None:
dot_lifetime = defaults.randomdotkinematogram_dot_lifetime
if dot_radius is None:
dot_radius = defaults.randomdotkinematogram_dot_radius
if dot_colour is None:
dot_colour = defaults.randomdotkinematogram_dot_colour
if north_up_clockwise is None:
north_up_clockwise = defaults.randomdotkinematogram_north_up_clockwise
if position is None:
position = defaults.randomdotkinematogram_position
if background_colour is None:
background_colour = defaults.randomdotkinematogram_background_colour
self.area_radius = area_radius
self.dot_speed = dot_speed
self.dot_lifetime = dot_lifetime
self.dot_radius = dot_radius
self.dot_colour = dot_colour
self.north_up_clockwise = north_up_clockwise
self._canvas = Canvas(size=(2 * (self.area_radius + self.dot_radius),
2 * (self.area_radius + self.dot_radius)),
position=position,
colour=background_colour)
self.reset(n_dots=n_dots,
target_direction=target_direction,
target_dot_ratio=target_dot_ratio)
self.set_logging(False)
def reset(self, n_dots, target_direction, target_dot_ratio):
"""Reset and recreate dot pattern
Parameters:
-----------
n_dots : int
number of moving dots
target_direction : int, float (0-360)
movement target direction in degrees
target_dot_ratio : float (0-1)
ratio of dots that move consistently in the same target direction
(the rest of the target moves in a random direction)
can be sometimes only approximated! self.target_dot_ratio returns the
precise actual target dot ratio
"""
self.target_direction = target_direction
self.dots = map(lambda x: self._make_random_dot(direction=None),
range(n_dots))
self.target_dot_ratio = target_dot_ratio
def reset_all_ages(self, randomize_ages=False):
"""Reset all ages (born at current time) and randomize start age if required"""
map(lambda x: x.reset_age(randomize_age=randomize_ages), self.dots)
@property
def n_dots(self):
"""Getter for n_dots."""
return len(self.dots)
@property
def logging(self):
"""Getter for logging."""
return self._canvas.logging
def set_logging(self, onoff):
"""Set logging of this object on or off
Parameters:
-----------
onoff : bool
set logging on (True) or off (False)
"""
self._canvas.set_logging(onoff)
@property
def n_target_dots(self):
return sum(map(lambda x: int(x.is_target), self.dots))
@property
def target_dot_ratio(self):
"""Getter for target dot ratio"""
return self.n_target_dots / float(len(self.dots))
@target_dot_ratio.setter
def target_dot_ratio(self, value):
if value < 0:
value = 0
if value > 1:
value = 1
curr_n_targets = self.n_target_dots
goal_n_targets = int(len(self.dots) * value)
while goal_n_targets != curr_n_targets:
if goal_n_targets > curr_n_targets:
# remove non target and add target
for d in self.dots:
if not d.is_target:
self.dots.remove(d)
break
d = self._make_random_dot(direction=self.target_direction,
randomize_age=True)
d.is_target = True
self.dots.append(d)
elif goal_n_targets < curr_n_targets:
# remove a target and add non target
for d in self.dots:
if d.is_target:
self.dots.remove(d)
break
self.dots.append(
self._make_random_dot(direction=None, randomize_age=True))
curr_n_targets = self.n_target_dots
@property
def last_stimulus(self):
"""Getter for the last plotted stimulus"""
return self._canvas
def _make_random_dot(self, direction=None, randomize_age=False):
"""make a random dot"""
while (True):
pos = (int(self.area_radius -
random.random() * 2 * self.area_radius),
int(self.area_radius -
random.random() * 2 * self.area_radius))
if math.hypot(pos[0], pos[1]) < self.area_radius:
break
if direction is None:
direction = random.random() * 360
rtn = MovingPosition(position=pos,
direction=direction,
speed=self.dot_speed,
lifetime=self.dot_lifetime,
north_up_clockwise=self.north_up_clockwise)
if randomize_age:
rtn.reset_age(randomize_age=True)
return rtn
def make_frame(self, background_stimulus=None):
"""Make new frame. The function creates the current random dot kinematogram
and returns it as Expyriment stimulus.
Parameters:
-----------
background_stimulus : Expyriment stimulus, optional
optional stimulus to be plotted in the background
(default=None)
Notes:
------
Just loop this function and plot the returned stimulus.
See present_and_wait_keyboard
Returns:
--------
stimulus : return the current as Expyriment stimulus
"""
self._canvas.clear_surface()
if background_stimulus is not None:
background_stimulus.plot(self._canvas)
def _process_dot(d):
if d.is_dead or d.is_outside(self.area_radius):
if d.is_target:
d = self._make_random_dot(direction=d.direction)
d.is_target = True
else:
d = self._make_random_dot()
Circle(position=d.position,
radius=self.dot_radius,
colour=self.dot_colour).plot(self._canvas)
return d
self.dots = map(_process_dot, self.dots)
return self._canvas
def present_and_wait_keyboard(self,
background_stimulus=None,
check_keys=None,
change_parameter=(None, None),
duration=None,
button_box=None):
"""Present the random dot kinematogram and wait for keyboard press.
Parameters:
-----------
background_stimulus : Expyriment stimulus, optional
optional stimulus to be plotted in the background
(default=None)
check_keys : int or list, optional
a specific key or list of keys to check
change_parameter : tuple (int, int), optional, default = (None, None)
[step size (target dot ratio), step interval (ms)]
if both parameter are defined (not None), target dot ratio changes
accordingly while presentation
duration: int, optional
maximum duration to wait for keypress
button_box: expyriment io.ButtonBox object, optional
if not the keyboard but a button_box should be used
(e.g. io.StreamingButtonBox)
"""
from expyriment import _active_exp
RT = Clock()
if button_box is None:
button_box = _active_exp.keyboard
button_box.clear()
self.reset_all_ages(randomize_ages=True)
last_change_time = RT.stopwatch_time
while (True):
if None not in change_parameter:
if RT.stopwatch_time >= change_parameter[1] + last_change_time:
last_change_time = RT.stopwatch_time
self.target_dot_ratio = self.target_dot_ratio + \
change_parameter[0]
self.make_frame(background_stimulus=background_stimulus).present()
if isinstance(button_box, Keyboard):
key = button_box.check(keys=check_keys)
else:
_active_exp.keyboard.process_control_keys()
key = button_box.check(codes=check_keys)
if key is not None:
break
if duration is not None and RT.stopwatch_time >= duration:
return (None, None)
return key, RT.stopwatch_time
def rotate(self, degree, filter=True): # Exypriment >=.9
self.unlock_pixel_array()
return Canvas.rotate(self, degree, filter)
def clear_surface(self):
self.unlock_pixel_array()
return Canvas.clear_surface(self)
def __init__(
self,
area_radius,
n_dots,
target_direction,
target_dot_ratio,
position=None,
dot_speed=None,
dot_lifetime=None,
dot_radius=None,
dot_colour=None,
background_colour=None,
north_up_clockwise=None,
):
"""Create a Random Dot Kinematogram
Parameters:
-----------
area_radius : int
the radius of the stimulus area
n_dots : int
number of moving dots
target_direction : int, float (0-360)
movement target direction in degrees
target_dot_ratio : float (0-1)
ratio of dots that move consistently in the same target direction
(the rest of the target moves in a random direction)
can be sometimes only approximated! self.target_dot_ratio returns the
precise actual target dot ratio
position : (int, int), optional
position of the stimulus
dot_speed : int, optional
the moving speed in pixel per second (default=100)
dot_lifetime : int, optional
the time the object lives in milliseconds (default 400)
dot_radius : int, optional
radius of the dots (default = 3)
dot_colour : (int, int, int), optional
colour (RGB) of the dots (default=experiment.foreground_colour)
background_colour : (int, int, int), optional
colour (RGB) of the background (default=experiment.background_colour)
north_up_clockwise : bool, optional
if true (default) all directional information refer to an
north up and clockwise system
otherwise 0 is right, counterclockwise (default=True)
Notes:
------
Logging is switch off per default
"""
if dot_speed is None:
dot_speed = defaults.randomdotkinematogram_dot_speed
if dot_lifetime is None:
dot_lifetime = defaults.randomdotkinematogram_dot_lifetime
if dot_radius is None:
dot_radius = defaults.randomdotkinematogram_dot_radius
if dot_colour is None:
dot_colour = defaults.randomdotkinematogram_dot_colour
if north_up_clockwise is None:
north_up_clockwise = defaults.randomdotkinematogram_north_up_clockwise
if position is None:
position = defaults.randomdotkinematogram_position
if background_colour is None:
background_colour = defaults.randomdotkinematogram_background_colour
self.area_radius = area_radius
self.dot_speed = dot_speed
self.dot_lifetime = dot_lifetime
self.dot_radius = dot_radius
self.dot_colour = dot_colour
self.north_up_clockwise = north_up_clockwise
self._canvas = Canvas(
size=(2 * (self.area_radius + self.dot_radius), 2 * (self.area_radius + self.dot_radius)),
position=position,
colour=background_colour,
)
self.reset(n_dots=n_dots, target_direction=target_direction, target_dot_ratio=target_dot_ratio)
self.set_logging(False)
def copy(self):
self.unlock_pixel_array()
return Canvas.copy(self)
def __init__(self, size, position=None, colour=None):
Canvas.__init__(self, size, position, colour)
self._px_array = None
def unload(self, keep_surface=False):
if not keep_surface:
self.unlock_pixel_array()
return Canvas.unload(self, keep_surface)
def decompress(self):
self.unlock_pixel_array()
return Canvas.decompress(self)
def rotate(self, degree):
self.unlock_pixel_array()
return Canvas.rotate(self, degree)
def clear_surface(self):
self.unlock_pixel_array()
return Canvas.clear_surface(self)
def scale(self, factors):
self.unlock_pixel_array()
return Canvas.scale(self, factors)
def unload(self, keep_surface=False):
if not keep_surface:
self.unlock_pixel_array()
return Canvas.unload(self, keep_surface)
def flip(self, booleans):
self.unlock_pixel_array()
return Canvas.flip(self, booleans)
def scale(self, factors):
self.unlock_pixel_array()
return Canvas.scale(self, factors)
def blur(self, level):
self.unlock_pixel_array()
return Canvas.blur(self, level)
def blur(self, level):
self.unlock_pixel_array()
return Canvas.blur(self, level)
def scramble(self, grain_size):
self.unlock_pixel_array()
return Canvas.scramble(self, grain_size)
def add_noise(self, grain_size, percentage, colour):
self.unlock_pixel_array()
return Canvas.add_noise(self, grain_size, percentage, colour)
def add_noise(self, grain_size, percentage, colour):
self.unlock_pixel_array()
return Canvas.add_noise(self, grain_size, percentage, colour)
def __init__(self, size, position=None, colour=None):
Canvas.__init__(self, size, position, colour)
self._px_array = None
class RandomDotKinematogram(Stimulus):
"""Random Dot Kinematogram"""
def __init__(
self,
area_radius,
n_dots,
target_direction,
target_dot_ratio,
position=None,
dot_speed=None,
dot_lifetime=None,
dot_radius=None,
dot_colour=None,
background_colour=None,
north_up_clockwise=None,
):
"""Create a Random Dot Kinematogram
Parameters:
-----------
area_radius : int
the radius of the stimulus area
n_dots : int
number of moving dots
target_direction : int, float (0-360)
movement target direction in degrees
target_dot_ratio : float (0-1)
ratio of dots that move consistently in the same target direction
(the rest of the target moves in a random direction)
can be sometimes only approximated! self.target_dot_ratio returns the
precise actual target dot ratio
position : (int, int), optional
position of the stimulus
dot_speed : int, optional
the moving speed in pixel per second (default=100)
dot_lifetime : int, optional
the time the object lives in milliseconds (default 400)
dot_radius : int, optional
radius of the dots (default = 3)
dot_colour : (int, int, int), optional
colour (RGB) of the dots (default=experiment.foreground_colour)
background_colour : (int, int, int), optional
colour (RGB) of the background (default=experiment.background_colour)
north_up_clockwise : bool, optional
if true (default) all directional information refer to an
north up and clockwise system
otherwise 0 is right, counterclockwise (default=True)
Notes:
------
Logging is switch off per default
"""
if dot_speed is None:
dot_speed = defaults.randomdotkinematogram_dot_speed
if dot_lifetime is None:
dot_lifetime = defaults.randomdotkinematogram_dot_lifetime
if dot_radius is None:
dot_radius = defaults.randomdotkinematogram_dot_radius
if dot_colour is None:
dot_colour = defaults.randomdotkinematogram_dot_colour
if north_up_clockwise is None:
north_up_clockwise = defaults.randomdotkinematogram_north_up_clockwise
if position is None:
position = defaults.randomdotkinematogram_position
if background_colour is None:
background_colour = defaults.randomdotkinematogram_background_colour
self.area_radius = area_radius
self.dot_speed = dot_speed
self.dot_lifetime = dot_lifetime
self.dot_radius = dot_radius
self.dot_colour = dot_colour
self.north_up_clockwise = north_up_clockwise
self._canvas = Canvas(
size=(2 * (self.area_radius + self.dot_radius), 2 * (self.area_radius + self.dot_radius)),
position=position,
colour=background_colour,
)
self.reset(n_dots=n_dots, target_direction=target_direction, target_dot_ratio=target_dot_ratio)
self.set_logging(False)
def reset(self, n_dots, target_direction, target_dot_ratio):
"""Reset and recreate dot pattern
Parameters:
-----------
n_dots : int
number of moving dots
target_direction : int, float (0-360)
movement target direction in degrees
target_dot_ratio : float (0-1)
ratio of dots that move consistently in the same target direction
(the rest of the target moves in a random direction)
can be sometimes only approximated! self.target_dot_ratio returns the
precise actual target dot ratio
"""
self.target_direction = target_direction
self.dots = map(lambda x: self._make_random_dot(direction=None), range(n_dots))
self.target_dot_ratio = target_dot_ratio
def reset_all_ages(self, randomize_ages=False):
"""Reset all ages (born at current time) and randomize start age if required"""
map(lambda x: x.reset_age(randomize_age=randomize_ages), self.dots)
@property
def n_dots(self):
"""Getter for n_dots."""
return len(self.dots)
@property
def logging(self):
"""Getter for logging."""
return self._canvas.logging
def set_logging(self, onoff):
"""Set logging of this object on or off
Parameters:
-----------
onoff : bool
set logging on (True) or off (False)
"""
self._canvas.set_logging(onoff)
@property
def n_target_dots(self):
return sum(map(lambda x: int(x.is_target), self.dots))
@property
def target_dot_ratio(self):
"""Getter for target dot ratio"""
return self.n_target_dots / float(len(self.dots))
@target_dot_ratio.setter
def target_dot_ratio(self, value):
if value < 0:
value = 0
if value > 1:
value = 1
curr_n_targets = self.n_target_dots
goal_n_targets = int(len(self.dots) * value)
while goal_n_targets != curr_n_targets:
if goal_n_targets > curr_n_targets:
# remove non target and add target
for d in self.dots:
if not d.is_target:
self.dots.remove(d)
break
d = self._make_random_dot(direction=self.target_direction, randomize_age=True)
d.is_target = True
self.dots.append(d)
elif goal_n_targets < curr_n_targets:
# remove a target and add non target
for d in self.dots:
if d.is_target:
self.dots.remove(d)
break
self.dots.append(self._make_random_dot(direction=None, randomize_age=True))
curr_n_targets = self.n_target_dots
@property
def last_stimulus(self):
"""Getter for the last plotted stimulus"""
return self._canvas
def _make_random_dot(self, direction=None, randomize_age=False):
"""make a random dot"""
while True:
pos = (
int(self.area_radius - random.random() * 2 * self.area_radius),
int(self.area_radius - random.random() * 2 * self.area_radius),
)
if math.hypot(pos[0], pos[1]) < self.area_radius:
break
if direction is None:
direction = random.random() * 360
rtn = MovingPosition(
position=pos,
direction=direction,
speed=self.dot_speed,
lifetime=self.dot_lifetime,
north_up_clockwise=self.north_up_clockwise,
)
if randomize_age:
rtn.reset_age(randomize_age=True)
return rtn
def make_frame(self, background_stimulus=None):
"""Make new frame. The function creates the current random dot kinematogram
and returns it as Expyriment stimulus.
Parameters:
-----------
background_stimulus : Expyriment stimulus, optional
optional stimulus to be plotted in the background
(default=None)
Notes:
------
Just loop this function and plot the returned stimulus.
See present_and_wait_keyboard
Returns:
--------
stimulus : return the current as Expyriment stimulus
"""
self._canvas.clear_surface()
if background_stimulus is not None:
background_stimulus.plot(self._canvas)
def _process_dot(d):
if d.is_dead or d.is_outside(self.area_radius):
if d.is_target:
d = self._make_random_dot(direction=d.direction)
d.is_target = True
else:
d = self._make_random_dot()
Circle(position=d.position, radius=self.dot_radius, colour=self.dot_colour).plot(self._canvas)
return d
self.dots = map(_process_dot, self.dots)
return self._canvas
def present_and_wait_keyboard(
self, background_stimulus=None, check_keys=None, change_parameter=(None, None), duration=None, button_box=None
):
"""Present the random dot kinematogram and wait for keyboard press.
Parameters:
-----------
background_stimulus : Expyriment stimulus, optional
optional stimulus to be plotted in the background
(default=None)
check_keys : int or list, optional
a specific key or list of keys to check
change_parameter : tuple (int, int), optional, default = (None, None)
[step size (target dot ratio), step interval (ms)]
if both parameter are defined (not None), target dot ratio changes
accordingly while presentation
duration: int, optional
maximum duration to wait for keypress
button_box: expyriment io.ButtonBox object, optional
if not the keyboard but a button_box should be used
(e.g. io.StreamingButtonBox)
"""
from expyriment import _active_exp
RT = Clock()
if button_box is None:
button_box = _active_exp.keyboard
button_box.clear()
self.reset_all_ages(randomize_ages=True)
last_change_time = RT.stopwatch_time
while True:
if None not in change_parameter:
if RT.stopwatch_time >= change_parameter[1] + last_change_time:
last_change_time = RT.stopwatch_time
self.target_dot_ratio = self.target_dot_ratio + change_parameter[0]
self.make_frame(background_stimulus=background_stimulus).present()
if isinstance(button_box, Keyboard):
key = button_box.check(keys=check_keys)
else:
_active_exp.keyboard.process_control_keys()
key = button_box.check(codes=check_keys)
if key is not None:
break
if duration is not None and RT.stopwatch_time >= duration:
return (None, None)
return key, RT.stopwatch_time