#!/usr/bin/env python
# coding: utf-8
# /*##########################################################################
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# Copyright (c) 2018 European Synchrotron Radiation Facility
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"""
This script illustrates image ROI selection in a :class:`~silx.gui.plot.PlotWidget`

It uses :class:`~silx.gui.plot.tools.roi.RegionOfInterestManager` and
:class:`~silx.gui.plot.tools.roi.RegionOfInterestTableWidget` to handle the
interactive ROI selection and to display the list of ROIs.
"""

import sys
import numpy

from silx.gui import qt
from silx.gui.plot import Plot2D
from silx.gui.plot.tools.roi import RegionOfInterestManager
from silx.gui.plot.tools.roi import RegionOfInterestTableWidget
from silx.gui.plot.items.roi import RectangleROI


def dummy_image():
    """Create a dummy image"""
    x = numpy.linspace(-1.5, 1.5, 1024)
    xv, yv = numpy.meshgrid(x, x)
    signal = numpy.exp(- (xv ** 2 / 0.15 ** 2
                          + yv ** 2 / 0.25 ** 2))
    # add noise
    signal += 0.3 * numpy.random.random(size=signal.shape)
    return signal


app = qt.QApplication([])  # Start QApplication

# Create the plot widget and add an image
plot = Plot2D()
plot.getDefaultColormap().setName('viridis')
plot.addImage(dummy_image())

# Create the object controlling the ROIs and set it up
roiManager = RegionOfInterestManager(plot)
roiManager.setColor('pink')  # Set the color of ROI


# Set the name of each created region of interest
def updateAddedRegionOfInterest(roi):
    """Called for each added region of interest: set the name"""
    if roi.getLabel() == '':
        roi.setLabel('ROI %d' % len(roiManager.getRois()))


roiManager.sigRoiAdded.connect(updateAddedRegionOfInterest)

# Add a rectangular region of interest
roi = RectangleROI()
roi.setGeometry(origin=(50, 50), size=(200, 200))
roi.setLabel('Initial ROI')
roiManager.addRoi(roi)

# Create the table widget displaying
roiTable = RegionOfInterestTableWidget()
roiTable.setRegionOfInterestManager(roiManager)

# Create a toolbar containing buttons for all ROI 'drawing' modes
roiToolbar = qt.QToolBar()  # The layout to store the buttons
roiToolbar.setIconSize(qt.QSize(16, 16))

for roiClass in roiManager.getSupportedRoiClasses():
    # Create a tool button and associate it with the QAction of each mode
    action = roiManager.getInteractionModeAction(roiClass)
    roiToolbar.addAction(action)

# Add the region of interest table and the buttons to a dock widget
widget = qt.QWidget()
layout = qt.QVBoxLayout()
widget.setLayout(layout)
layout.addWidget(roiToolbar)
layout.addWidget(roiTable)

dock = qt.QDockWidget('Image ROI')
dock.setWidget(widget)
plot.addTabbedDockWidget(dock)

# Show the widget and start the application
plot.show()
result = app.exec_()
app.deleteLater()
sys.exit(result)