How to use the klayout.QtGui function in klayout

# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
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# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA


import klayout.QtCore
import klayout.QtGui
if not "QApplication" in klayout.QtGui.__all__:
  import klayout.QtWidgets  # Qt5
import klayout.lay as lay
import unittest
import sys

# Tests the basic abilities of the module

class BasicTest(unittest.TestCase):

  def test_1(self):
    self.assertEqual("Annotation" in lay.__all__, True)

  def test_2(self):
    # Some smoke test
    ant = lay.Annotation()
    ant.style = lay.Annotation.StyleRuler

def test_2(self):
    # Some smoke test
    v = QtGui.QColor(12, 34, 68)
    self.assertEqual(v.red, 12)
    v.red = 17
    self.assertEqual(v.red, 17)
    self.assertEqual(v.green, 34)
    self.assertEqual(v.blue, 68)

def test_1(self):
    self.assertEqual("QColor" in QtGui.__all__, True)