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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
import os
from packaging.version import Version
from vispy.util import use_log_level
def has_matplotlib(version='1.2'):
"""Determine if mpl is a usable version"""
try:
import matplotlib
except Exception:
has_mpl = False
else:
if Version(matplotlib.__version__) >= Version(version):
has_mpl = True
else:
has_mpl = False
return has_mpl
def has_skimage(version='0.11'):
"""Determine if scikit-image is a usable version"""
try:
import skimage
except ImportError:
return False
sk_version = Version(skimage.__version__)
return sk_version >= Version(version)
def has_backend(backend, has=(), capable=(), out=()):
from ..app.backends import BACKENDMAP
using = os.getenv('_VISPY_TESTING_APP', None)
if using is not None and using != backend:
# e.g., we are on a 'pyglet' run but the test requires PyQt4
ret = (False,) if len(out) > 0 else False
for o in out:
ret += (None,)
return ret
# let's follow the standard code path
module_name = BACKENDMAP[backend.lower()][1]
with use_log_level('warning', print_msg=False):
mod = __import__('app.backends.%s' % module_name, globals(), level=2)
mod = getattr(mod.backends, module_name)
good = mod.testable
for h in has:
good = (good and getattr(mod, 'has_%s' % h))
for cap in capable:
good = (good and mod.capability[cap])
ret = (good,) if len(out) > 0 else good
for o in out:
ret += (getattr(mod, o),)
return ret
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