/
canvas.py
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/
canvas.py
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#-*- coding:utf-8 -*-
"""
This file is part of OpenSesame.
OpenSesame is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenSesame is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with OpenSesame. If not, see <http://www.gnu.org/licenses/>.
"""
from libopensesame.py3compat import *
from openexp import backend
import tempfile
try:
import pygame
except ImportError:
pass
import os
# A list of temporary files that should be cleaned up.
temp_files = []
def canvas(experiment, *arglist, **kwdict):
"""
desc:
A factory that returns a back-end specific canvas object.
arguments:
experiment:
desc: The experiment object.
type: experiment
argument-list:
arglist: See canvas.__init__().
keyword-dict:
kwdict: See canvas.__init__().
"""
cls = backend.get_backend_class(experiment, u'canvas')
return cls(experiment, *arglist, **kwdict)
def init_display(experiment):
"""
desc:
Calls the back-end specific init_display function.
arguments:
experiment: The experiment object.
type: experiment
"""
cls = backend.get_backend_class(experiment, u'canvas')
cls.init_display(experiment)
def close_display(experiment):
"""
desc:
Calls the back-end specific close_display function.
arguments:
experiment: The experiment object.
type: experiment
"""
cls = backend.get_backend_class(experiment, u'canvas')
cls.close_display(experiment)
def clean_up(verbose=False):
"""
desc:
Cleans up temporary pool folders.
keywords:
verbose:
desc: Indicates if debugging output should be provided.
type: bool
"""
global temp_files
if verbose:
print(u"canvas.clean_up()")
for path in temp_files:
if verbose:
print(u"canvas.clean_up(): removing '%s'" % path)
try:
os.remove(path)
except Exception as e:
if verbose:
print(u"canvas.clean_up(): failed to remove '%s': %s" \
% (path, e))
def gabor_file(*arglist, **kwdict):
"""
desc:
Creates a temporary file containing a Gabor patch.
argument-list:
arglist: See canvas.gabor() for a description of arguments.
keyword-dict:
kwdict: See canvas.gabor() for a description of keywords.
returns:
A path to the image file.
"""
from openexp._canvas import canvas as _canvas
surface = _canvas._gabor(*arglist, **kwdict)
fd, fname = tempfile.mkstemp(suffix=u'.png')
pygame.image.save(surface, fname)
temp_files.append(fname)
os.close(fd)
return fname
def noise_file(*arglist, **kwdict):
"""
desc:
Creates a temporary file containing a noise patch.
argument-list:
arglist: See canvas.noise_path() for a description of arguments.
keyword-dict:
kwdict: See canvas.noise_path() for a description of keywords.
returns:
A path to the image file.
"""
from openexp._canvas import canvas as _canvas
surface = _canvas._noise_patch(*arglist, **kwdict)
fd, fname = tempfile.mkstemp(suffix=u'.png')
pygame.image.save(surface, fname)
temp_files.append(fname)
os.close(fd)
return fname