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# /*##########################################################################
# Copyright (c) 2016-2018 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.
#
# ###########################################################################*/
"""
This example demonstrates how to use ScatterMaskToolsWidget
and NamedScatterAlphaSlider with a PlotWidget.
"""
import numpy
from silx.gui import qt
from silx.gui.plot import PlotWidget
from silx.gui.plot.AlphaSlider import NamedScatterAlphaSlider
from silx.gui.plot import ScatterMaskToolsWidget
class MaskScatterWidget(qt.QMainWindow):
"""Simple plot widget designed to display a scatter plot on top
of a background image.
A transparency slider is provided to adjust the transparency of the
scatter points.
A mask tools widget is provided to select/mask points of the scatter
plot.
"""
def __init__(self, parent=None):
super(MaskScatterWidget, self).__init__(parent=parent)
self._activeScatterLegend = "active scatter"
self._bgImageLegend = "background image"
# widgets
centralWidget = qt.QWidget(self)
self._plot = PlotWidget(parent=centralWidget)
self._maskToolsWidget = ScatterMaskToolsWidget.ScatterMaskToolsWidget(
plot=self._plot, parent=centralWidget
)
self._alphaSlider = NamedScatterAlphaSlider(parent=self, plot=self._plot)
self._alphaSlider.setOrientation(qt.Qt.Horizontal)
self._alphaSlider.setToolTip("Adjust scatter opacity")
# layout
layout = qt.QVBoxLayout(centralWidget)
layout.addWidget(self._plot)
layout.addWidget(self._alphaSlider)
layout.addWidget(self._maskToolsWidget)
centralWidget.setLayout(layout)
self.setCentralWidget(centralWidget)
def setSelectionMask(self, mask, copy=True):
"""Set the mask to a new array.
:param numpy.ndarray mask: The array to use for the mask.
Mask type: array of uint8 of dimension 1,
Array of other types are converted.
:param bool copy: True (the default) to copy the array,
False to use it as is if possible.
:return: None if failed, shape of mask as 1-tuple if successful.
"""
return self._maskToolsWidget.setSelectionMask(mask, copy=copy)
def getSelectionMask(self, copy=True):
"""Get the current mask as a 1D array.
:param bool copy: True (default) to get a copy of the mask.
If False, the returned array MUST not be modified.
:return: The array of the mask with dimension of the scatter data.
If there is no scatter data, None is returned.
:rtype: 1D numpy.ndarray of uint8
"""
return self._maskToolsWidget.getSelectionMask(copy=copy)
def setBackgroundImage(
self, image, xscale=(0, 1.0), yscale=(0, 1.0), colormap=None
):
"""Set a background image
:param image: 2D image, array of shape (nrows, ncolumns)
or (nrows, ncolumns, 3) or (nrows, ncolumns, 4) RGB(A) pixmap
:param xscale: Factors for polynomial scaling for x-axis,
*(a, b)* such as :math:`x \mapsto a + bx`
:param yscale: Factors for polynomial scaling for y-axis
"""
self._plot.addImage(
image,
legend=self._bgImageLegend,
origin=(xscale[0], yscale[0]),
scale=(xscale[1], yscale[1]),
z=0,
colormap=colormap,
)
def setScatter(self, x, y, v=None, info=None, colormap=None):
"""Set the scatter data, by providing its data as a 1D
array or as a pixmap.
The scatter plot set through this method is associated
with the transparency slider.
:param x: 1D array of x coordinates
:param y: 1D array of y coordinates
:param v: Array of values for each point, represented as the color
of the point on the plot.
"""
self._plot.addScatter(
x, y, v, legend=self._activeScatterLegend, info=info, colormap=colormap
)
# the mask is associated with the active scatter
self._plot.setActiveScatter(self._activeScatterLegend)
self._alphaSlider.setLegend(self._activeScatterLegend)
if __name__ == "__main__":
app = qt.QApplication([])
msw = MaskScatterWidget()
# create a synthetic bg image
bg_img = numpy.arange(200 * 150).reshape((200, 150))
bg_img[75:125, 80:120] = 1000
# create synthetic data for a scatter plot
twopi = numpy.pi * 2
x = 50 + 80 * numpy.linspace(0, twopi, num=100) / twopi * numpy.cos(
numpy.linspace(0, twopi, num=100)
)
y = 150 + 150 * numpy.linspace(0, twopi, num=100) / twopi * numpy.sin(
numpy.linspace(0, twopi, num=100)
)
v = numpy.arange(100) / 3.14
msw.setScatter(x, y, v=v)
msw.setBackgroundImage(bg_img)
msw.show()
app.exec()
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