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# /*#########################################################################
#
# The PyMca X-Ray Fluorescence Toolkit
#
# Copyright (c) 2004-2015 European Synchrotron Radiation Facility
#
# This file is part of the PyMca X-ray Fluorescence Toolkit developed at
# the ESRF by the Software group.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ###########################################################################*/
from __future__ import absolute_import, division, print_function, \
unicode_literals
__author__ = "T. Vincent - ESRF Data Analysis"
__contact__ = "thomas.vincent@esrf.fr"
__license__ = "MIT"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
__doc__ = """Qhull library wrapper for Delaunay triangulation.
See http://www.qhull.org/.
Supports float32 and float64 formats depending on the Qhull library used.
"""
import numpy
import warnings
from . import _qhull64
try:
from . import _qhull32
except ImportError:
_qhull32 = None
__version__ = _qhull64.__version__
"""Version of the Qhull library."""
def delaunay(points, options=None, dtype=numpy.float64):
"""Delaunay triangulation using qhull library.
:param points: Array-like set of points to triangulate.
Array must be of dimension 2 and of type float32 or float64.
:param options: Options of the 'qhull d' command to run
or None (the default) for default flags.
See http://www.qhull.org/ for details.
:type options: iterable of str.
:param numpy.dtype dtype: The data type to use for computation.
numpy.float32 or numpy.float64 or None.
:returns: Indices of corners of simplex facets.
:rtype: numpy.ndarray of uint32 of shape (nbFacets, (points dim + 1)).
"""
assert dtype in (None, numpy.float32, numpy.float64)
if _qhull32 is None:
# Force dtype if qhull float32 is not available
if dtype == numpy.float32:
warnings.warn('Qhull for float32 not available', RuntimeWarning)
dtype = numpy.float64
points = numpy.array(points, dtype=dtype, order='C', copy=False)
if options is None:
options = ['Qbb', 'QJ', 'Qc']
if points.dtype == numpy.float32:
options.append('Po')
command = 'qhull d ' + ' '.join(options)
if points.dtype == numpy.float32:
return _qhull32.delaunay(points, command)
elif points.dtype == numpy.float64:
return _qhull64.delaunay(points, command)
else:
raise ValueError('Unsupported array dtype %s' % points.dtype)
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