def _get_index_image(self):
        x, y, z = self.item
        if sqrt((x - 0.5) ** 2 + (y - 0.5) ** 2 + (z - 0.5) ** 2) <= 0.25:
            return '@icons:red_ball'

        return None

#-- ShowArray Class Definition -------------------------------------------------
dataset/ETHPy150Open enthought/traitsui/examples/demo/Advanced/NumPy_array_tabular_editor_demo.py/ArrayAdapter._get_index_image/original