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# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2004-2018 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.
#
# ###########################################################################*/
"""A QComboBox to display prefered colormaps
"""
from __future__ import division
__authors__ = ["V.A. Sole", "T. Vincent", "H. Payno"]
__license__ = "MIT"
__date__ = "27/11/2018"
import logging
import numpy
from .. import qt
from .. import colors as colors_mdl
_logger = logging.getLogger(__name__)
_colormapIconPreview = {}
class ColormapNameComboBox(qt.QComboBox):
def __init__(self, parent=None):
qt.QComboBox.__init__(self, parent)
self.__initItems()
LUT_NAME = qt.Qt.UserRole + 1
LUT_COLORS = qt.Qt.UserRole + 2
def __initItems(self):
for colormapName in colors_mdl.preferredColormaps():
index = self.count()
self.addItem(str.title(colormapName))
self.setItemIcon(index, self.getIconPreview(name=colormapName))
self.setItemData(index, colormapName, role=self.LUT_NAME)
def getIconPreview(self, name=None, colors=None):
"""Return an icon preview from a LUT name.
This icons are cached into a global structure.
:param str name: Name of the LUT
:param numpy.ndarray colors: Colors identify the LUT
:rtype: qt.QIcon
"""
if name is not None:
iconKey = name
else:
iconKey = tuple(colors)
icon = _colormapIconPreview.get(iconKey, None)
if icon is None:
icon = self.createIconPreview(name, colors)
_colormapIconPreview[iconKey] = icon
return icon
def createIconPreview(self, name=None, colors=None):
"""Create and return an icon preview from a LUT name.
This icons are cached into a global structure.
:param str name: Name of the LUT
:param numpy.ndarray colors: Colors identify the LUT
:rtype: qt.QIcon
"""
colormap = colors_mdl.Colormap(name)
size = 32
if name is not None:
lut = colormap.getNColors(size)
else:
lut = colors
if len(lut) > size:
# Down sample
step = int(len(lut) / size)
lut = lut[::step]
elif len(lut) < size:
# Over sample
indexes = numpy.arange(size) / float(size) * (len(lut) - 1)
indexes = indexes.astype("int")
lut = lut[indexes]
if lut is None or len(lut) == 0:
return qt.QIcon()
pixmap = qt.QPixmap(size, size)
painter = qt.QPainter(pixmap)
for i in range(size):
rgb = lut[i]
r, g, b = rgb[0], rgb[1], rgb[2]
painter.setPen(qt.QColor(r, g, b))
painter.drawPoint(qt.QPoint(i, 0))
painter.drawPixmap(0, 1, size, size - 1, pixmap, 0, 0, size, 1)
painter.end()
return qt.QIcon(pixmap)
def getCurrentName(self):
return self.itemData(self.currentIndex(), self.LUT_NAME)
def getCurrentColors(self):
return self.itemData(self.currentIndex(), self.LUT_COLORS)
def findLutName(self, name):
return self.findData(name, role=self.LUT_NAME)
def findLutColors(self, lut):
for index in range(self.count()):
if self.itemData(index, role=self.LUT_NAME) is not None:
continue
colors = self.itemData(index, role=self.LUT_COLORS)
if colors is None:
continue
if numpy.array_equal(colors, lut):
return index
return -1
def setCurrentLut(self, colormap):
name = colormap.getName()
if name is not None:
self._setCurrentName(name)
else:
lut = colormap.getColormapLUT()
self._setCurrentLut(lut)
def _setCurrentLut(self, lut):
index = self.findLutColors(lut)
if index == -1:
index = self.count()
self.addItem("Custom")
self.setItemIcon(index, self.getIconPreview(colors=lut))
self.setItemData(index, None, role=self.LUT_NAME)
self.setItemData(index, lut, role=self.LUT_COLORS)
self.setCurrentIndex(index)
def _setCurrentName(self, name):
index = self.findLutName(name)
if index < 0:
index = self.count()
self.addItem(str.title(name))
self.setItemIcon(index, self.getIconPreview(name=name))
self.setItemData(index, name, role=self.LUT_NAME)
self.setCurrentIndex(index)
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