/usr/share/pyshared/VisionEgg/Dots.py is in python-visionegg 1.2.1-1.
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#
# Copyright (C) 2001-2003 Andrew Straw.
# Copyright (C) 2005,2008 California Institute of Technology
#
# URL: <http://www.visionegg.org/>
#
# Distributed under the terms of the GNU Lesser General Public License
# (LGPL). See LICENSE.TXT that came with this file.
"""
Random dot stimuli.
"""
####################################################################
#
# Import all the necessary packages
#
####################################################################
import logging
import VisionEgg
import VisionEgg.Core
import VisionEgg.ParameterTypes as ve_types
import numpy.oldnumeric as Numeric, numpy.oldnumeric.random_array as RandomArray
import math, types, string
import VisionEgg.GL as gl # get all OpenGL stuff in one namespace
### C version of draw_dots() isn't (yet) as fast as Python version:
##import VisionEgg._draw_in_c
##draw_dots = VisionEgg._draw_in_c.draw_dots # draw in C for speed
def draw_dots(xs,ys,zs):
"""Python method for drawing dots. May be replaced by a faster C version."""
if not (len(xs) == len(ys) == len(zs)):
raise ValueError("All input arguments must be same length")
gl.glBegin(gl.GL_POINTS)
for i in xrange(len(xs)):
gl.glVertex3f(xs[i],ys[i],zs[i])
gl.glEnd()
class DotArea2D(VisionEgg.Core.Stimulus):
"""Random dots of constant velocity
Every dot has the same velocity. Some fraction of the dots all
move in the one direction, while the rest move in random
directions. Dots wrap around edges. Each dot has a lifespan.
This is just one example of the endless variations on drawing random dots.
Parameters
==========
anchor -- (String)
Default: center
anti_aliasing -- (Boolean)
Default: True
color -- (AnyOf(Sequence3 of Real or Sequence4 of Real))
Default: (1.0, 1.0, 1.0)
depth -- (Real)
Default: (determined at runtime)
dot_lifespan_sec -- (Real)
Default: 5.0
dot_size -- (Real)
Default: 4.0
on -- (Boolean)
Default: True
position -- (Sequence2 of Real)
Default: (320.0, 240.0)
signal_direction_deg -- (Real)
Default: 90.0
signal_fraction -- (Real)
Default: 0.5
size -- (Sequence2 of Real)
Default: (300.0, 300.0)
velocity_pixels_per_sec -- (Real)
Default: 10.0
Constant Parameters
===================
num_dots -- (UnsignedInteger)
Default: 100
"""
parameters_and_defaults = {
'on' : ( True,
ve_types.Boolean ),
'position' : ( ( 320.0, 240.0 ), # in eye coordinates
ve_types.Sequence2(ve_types.Real) ),
'anchor' : ('center',
ve_types.String),
'size' : ( ( 300.0, 300.0 ), # in eye coordinates
ve_types.Sequence2(ve_types.Real) ),
'signal_fraction' : ( 0.5,
ve_types.Real ),
'signal_direction_deg' : ( 90.0,
ve_types.Real ),
'velocity_pixels_per_sec' : ( 10.0,
ve_types.Real ),
'dot_lifespan_sec' : ( 5.0,
ve_types.Real ),
'color' : ((1.0,1.0,1.0),
ve_types.AnyOf(ve_types.Sequence3(ve_types.Real),
ve_types.Sequence4(ve_types.Real))),
'dot_size' : (4.0, # pixels
ve_types.Real),
'anti_aliasing' : ( True,
ve_types.Boolean ),
'depth' : ( None, # set for depth testing
ve_types.Real ),
'center' : (None, # DEPRECATED -- don't use
ve_types.Sequence2(ve_types.Real),
"",
VisionEgg.ParameterDefinition.DEPRECATED),
}
constant_parameters_and_defaults = {
'num_dots' : ( 100,
ve_types.UnsignedInteger ),
}
__slots__ = (
'x_positions',
'y_positions',
'random_directions_radians',
'last_time_sec',
'start_times_sec',
'_gave_alpha_warning',
)
def __init__(self, **kw):
VisionEgg.Core.Stimulus.__init__(self,**kw)
# store positions normalized between 0 and 1 so that re-sizing is ok
num_dots = self.constant_parameters.num_dots # shorthand
self.x_positions = RandomArray.uniform(0.0,1.0,(num_dots,))
self.y_positions = RandomArray.uniform(0.0,1.0,(num_dots,))
self.random_directions_radians = RandomArray.uniform(0.0,2*math.pi,(num_dots,))
self.last_time_sec = VisionEgg.time_func()
self.start_times_sec = None # setup variable, assign later
self._gave_alpha_warning = 0
def draw(self):
# XXX This method is not speed-optimized. I just wrote it to
# get the job done. (Nonetheless, it seems faster than the C
# version commented out above.)
p = self.parameters # shorthand
if p.center is not None:
if not hasattr(VisionEgg.config,"_GAVE_CENTER_DEPRECATION"):
logger = logging.getLogger('VisionEgg.Dots')
logger.warning("Specifying DotArea2D by deprecated "
"'center' parameter deprecated. Use "
"'position' parameter instead. (Allows "
"use of 'anchor' parameter to set to "
"other values.)")
VisionEgg.config._GAVE_CENTER_DEPRECATION = 1
p.anchor = 'center'
p.position = p.center[0], p.center[1] # copy values (don't copy ref to tuple)
if p.on:
# calculate center
center = VisionEgg._get_center(p.position,p.anchor,p.size)
if p.anti_aliasing:
if len(p.color) == 4 and not self._gave_alpha_warning:
if p.color[3] != 1.0:
logger = logging.getLogger('VisionEgg.Dots')
logger.warning("The parameter anti_aliasing is "
"set to true in the DotArea2D "
"stimulus class, but the color "
"parameter specifies an alpha "
"value other than 1.0. To "
"acheive the best anti-aliasing, "
"ensure that the alpha value for "
"the color parameter is 1.0.")
self._gave_alpha_warning = 1
gl.glEnable( gl.GL_POINT_SMOOTH )
# allow max_alpha value to control blending
gl.glEnable( gl.GL_BLEND )
gl.glBlendFunc( gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA )
else:
gl.glDisable( gl.GL_BLEND )
now_sec = VisionEgg.time_func()
if self.start_times_sec is not None:
# compute extinct dots and generate new positions
replace_indices = Numeric.nonzero( Numeric.greater( now_sec - self.start_times_sec, p.dot_lifespan_sec) )
Numeric.put( self.start_times_sec, replace_indices, now_sec )
new_x_positions = RandomArray.uniform(0.0,1.0,
(len(replace_indices),))
Numeric.put( self.x_positions, replace_indices, new_x_positions )
new_y_positions = RandomArray.uniform(0.0,1.0,
(len(replace_indices),))
Numeric.put( self.y_positions, replace_indices, new_y_positions )
new_random_directions_radians = RandomArray.uniform(0.0,2*math.pi,
(len(replace_indices),))
Numeric.put( self.random_directions_radians, replace_indices, new_random_directions_radians )
else:
# initialize dot extinction values to random (uniform) distribution
self.start_times_sec = RandomArray.uniform( now_sec - p.dot_lifespan_sec, now_sec,
(self.constant_parameters.num_dots,))
signal_num_dots = int(round(p.signal_fraction * self.constant_parameters.num_dots))
time_delta_sec = now_sec - self.last_time_sec
self.last_time_sec = now_sec # reset for next loop
x_increment_normalized = math.cos(p.signal_direction_deg/180.0*math.pi) * p.velocity_pixels_per_sec / p.size[0] * time_delta_sec
y_increment_normalized = -math.sin(p.signal_direction_deg/180.0*math.pi) * p.velocity_pixels_per_sec / p.size[1] * time_delta_sec
self.x_positions[:signal_num_dots] += x_increment_normalized
self.y_positions[:signal_num_dots] += y_increment_normalized
num_random_dots = self.constant_parameters.num_dots - signal_num_dots
random_x_increment_normalized = Numeric.cos(self.random_directions_radians[signal_num_dots:]) * p.velocity_pixels_per_sec / p.size[0] * time_delta_sec
random_y_increment_normalized = -Numeric.sin(self.random_directions_radians[signal_num_dots:]) * p.velocity_pixels_per_sec / p.size[1] * time_delta_sec
self.x_positions[signal_num_dots:] += random_x_increment_normalized
self.y_positions[signal_num_dots:] += random_y_increment_normalized
self.x_positions = Numeric.fmod( self.x_positions, 1.0 ) # wrap
self.y_positions = Numeric.fmod( self.y_positions, 1.0 )
self.x_positions = Numeric.fmod( self.x_positions+1, 1.0 ) # wrap again for values < 1
self.y_positions = Numeric.fmod( self.y_positions+1, 1.0 )
xs = (self.x_positions - 0.5) * p.size[0] + center[0]
ys = (self.y_positions - 0.5) * p.size[1] + center[1]
if len(p.color)==3:
gl.glColor3f(*p.color)
elif len(p.color)==4:
gl.glColor4f(*p.color)
gl.glPointSize(p.dot_size)
# Clear the modeview matrix
gl.glMatrixMode(gl.GL_MODELVIEW)
gl.glPushMatrix()
gl.glDisable(gl.GL_TEXTURE_2D)
if p.depth is None:
depth = 0.0
else:
gl.glEnable(gl.GL_DEPTH_TEST)
depth = p.depth
zs = (depth,)*len(xs) # make N tuple with repeat value of depth
draw_dots(xs,ys,zs)
if p.anti_aliasing:
gl.glDisable( gl.GL_POINT_SMOOTH ) # turn off
gl.glPopMatrix()
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