#!/usr/bin/env python
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"""Example demonstrating the use of the widget CompareImages"""

import sys
import logging
import numpy
import argparse

import silx.io
from silx.gui import qt
import silx.test.utils
from silx.gui.plot.CompareImages import CompareImages

_logger = logging.getLogger(__name__)


def createTestData():
    data = numpy.arange(100 * 100)
    data = (data % 100) / 5.0
    data = numpy.sin(data)
    data1 = data.copy()
    data1.shape = 100, 100
    data2 = silx.test.utils.add_gaussian_noise(data, stdev=0.1)
    data2.shape = 100, 100
    return data1, data2


def createParser():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument(
        "--debug",
        dest="debug",
        action="store_true",
        default=False,
        help="Set logging system in debug mode",
    )
    parser.add_argument(
        "--use-opengl-plot",
        dest="use_opengl_plot",
        action="store_true",
        default=False,
        help="Use OpenGL for plots (instead of matplotlib)",
    )
    return parser


if __name__ == "__main__":
    parser = createParser()
    options = parser.parse_args(sys.argv[1:])

    if options.debug:
        logging.root.setLevel(logging.DEBUG)

    if options.use_opengl_plot:
        backend = "gl"
    else:
        backend = "mpl"

    app = qt.QApplication([])

    data1, data2 = createTestData()
    window = CompareImages(backend=backend)
    window.setData(data1, data2)
    window.setVisible(True)
    app.exec()