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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2018-2019 European Synchrotron Radiation Facility
#
# 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.
#
# ###########################################################################*/
"""This module profile tools for scatter plots.
"""
__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "28/06/2018"
import logging
import weakref
import numpy
from ._BaseProfileToolBar import _BaseProfileToolBar
from ... import items
from ....utils.concurrent import submitToQtMainThread
_logger = logging.getLogger(__name__)
class ScatterProfileToolBar(_BaseProfileToolBar):
"""QToolBar providing scatter plot profiling tools
:param parent: See :class:`QToolBar`.
:param plot: :class:`~silx.gui.plot.PlotWidget` on which to operate.
:param str title: See :class:`QToolBar`.
"""
def __init__(self, parent=None, plot=None, title='Scatter Profile'):
super(ScatterProfileToolBar, self).__init__(parent, plot, title)
self.__nPoints = 1024
self.__scatterRef = None
self.__futureInterpolator = None
plot = self.getPlotWidget()
if plot is not None:
self._setScatterItem(plot._getActiveItem(kind='scatter'))
plot.sigActiveScatterChanged.connect(self.__activeScatterChanged)
def __activeScatterChanged(self, previous, legend):
"""Handle change of active scatter
:param Union[str,None] previous:
:param Union[str,None] legend:
"""
plot = self.getPlotWidget()
if plot is None or legend is None:
scatter = None
else:
scatter = plot.getScatter(legend)
self._setScatterItem(scatter)
def _getScatterItem(self):
"""Returns the scatter item currently handled by this tool.
:rtype: ~silx.gui.plot.items.Scatter
"""
return None if self.__scatterRef is None else self.__scatterRef()
def _setScatterItem(self, scatter):
"""Set the scatter tracked by this tool
:param Union[None,silx.gui.plot.items.Scatter] scatter:
"""
self.__futureInterpolator = None # Reset currently expected future
previousScatter = self._getScatterItem()
if previousScatter is not None:
previousScatter.sigItemChanged.disconnect(
self.__scatterItemChanged)
if scatter is None:
self.__scatterRef = None
else:
self.__scatterRef = weakref.ref(scatter)
scatter.sigItemChanged.connect(self.__scatterItemChanged)
# Refresh profile
self.updateProfile()
def __scatterItemChanged(self, event):
"""Handle update of active scatter plot item
:param ItemChangedType event:
"""
if event == items.ItemChangedType.DATA:
self.updateProfile() # Refresh profile
def hasPendingOperations(self):
"""Returns True if waiting for an interpolator to be ready
:rtype: bool
"""
return (self.__futureInterpolator is not None and
not self.__futureInterpolator.done())
# Number of points
def getNPoints(self):
"""Returns the number of points of the profiles
:rtype: int
"""
return self.__nPoints
def setNPoints(self, npoints):
"""Set the number of points of the profiles
:param int npoints:
"""
npoints = int(npoints)
if npoints < 1:
raise ValueError("Unsupported number of points: %d" % npoints)
elif npoints != self.__nPoints:
self.__nPoints = npoints
self.updateProfile()
# Overridden methods
def computeProfileTitle(self, x0, y0, x1, y1):
"""Compute corresponding plot title
:param float x0: Profile start point X coord
:param float y0: Profile start point Y coord
:param float x1: Profile end point X coord
:param float y1: Profile end point Y coord
:return: Title to use
:rtype: str
"""
if self.hasPendingOperations():
return 'Pre-processing data...'
else:
return super(ScatterProfileToolBar, self).computeProfileTitle(
x0, y0, x1, y1)
def __futureDone(self, future):
"""Handle completion of the interpolator creation"""
if future is self.__futureInterpolator:
# Only handle future callbacks for the current one
submitToQtMainThread(self.updateProfile)
def computeProfile(self, x0, y0, x1, y1):
"""Compute corresponding profile
:param float x0: Profile start point X coord
:param float y0: Profile start point Y coord
:param float x1: Profile end point X coord
:param float y1: Profile end point Y coord
:return: (points, values) profile data or None
"""
scatter = self._getScatterItem()
if scatter is None or self.hasPendingOperations():
return None
# Lazy async request of the interpolator
future = scatter._getInterpolator()
if future is not self.__futureInterpolator:
# First time we request this interpolator
self.__futureInterpolator = future
if not future.done():
future.add_done_callback(self.__futureDone)
return None
if future.cancelled() or future.exception() is not None:
return None # Something went wrong
interpolator = future.result()
if interpolator is None:
return None # Cannot init an interpolator
nPoints = self.getNPoints()
points = numpy.transpose((
numpy.linspace(x0, x1, nPoints, endpoint=True),
numpy.linspace(y0, y1, nPoints, endpoint=True)))
values = interpolator(points)
if not numpy.any(numpy.isfinite(values)):
return None # Profile outside convex hull
return points, values
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