polygon_test.py

# coding: utf-8
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"""Interactive test of silx polygon filling"""


__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "03/06/2016"


import logging

import numpy

from silx.gui import qt
from silx.gui.plot import PlotWindow
from silx.image.shapes import polygon_fill_mask


logging.basicConfig()
_logger = logging.getLogger(__name__)


class TestPolygon(PlotWindow):
    SIZE = 4096  # 1024

    def __init__(self, *args, **kwargs):
        super(TestPolygon, self).__init__(*args, **kwargs)
        self.image = numpy.arange(self.SIZE ** 2, dtype=numpy.float32).reshape(
            self.SIZE, self.SIZE
        )
        colormap = {
            "name": "temperature",
            "normalization": "linear",
            "autoscale": True,
            "vmin": 0.0,
            "vmax": 1.0,
        }
        self.addImage(self.image, legend="image", colormap=colormap)

        self._mask_colormap = {
            "name": None,
            "normalization": "linear",
            "autoscale": False,
            "vmin": 0.0,
            "vmax": 1.0,
            "colors": numpy.array(
                ((0.0, 0.0, 0.0, 0.0), (0.5, 0.5, 0.5, 0.5)), dtype=numpy.float32
            ),
        }

        self.sigPlotSignal.connect(self._handleDraw)
        self.setInteractiveMode("draw", shape="polygon", color="pink")

    def _handleDraw(self, event):
        if event["event"] not in ("drawingProgress", "drawingFinished"):
            return

        points = numpy.array((event["ydata"], event["xdata"])).T

        mask = polygon_fill_mask(points, (self.SIZE, self.SIZE))
        self.addImage(
            mask,
            legend="mask",
            colormap=self._mask_colormap,
            replace=False,
            resetzoom=False,
        )


def main(argv=None):
    global app  # To avoid seg fault on quit
    app = qt.QApplication([])
    plot = TestPolygon()
    plot.show()
    return app.exec_()


if __name__ == "__main__":
    import sys

    sys.exit(main(sys.argv[1:]))