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  """PySide6 QtDataVisualization example"""
  
  import sys
  from PySide6.QtCore import Qt
  from PySide6.QtGui import QGuiApplication
  from PySide6.QtWidgets import QApplication, QSizePolicy, QMainWindow, QWidget
  from PySide6.QtDataVisualization import (Q3DBars, QBar3DSeries, QBarDataItem,
                                           QCategory3DAxis, QValue3DAxis)
  
  
  def data_to_bar_data_row(data):
      return list(QBarDataItem(d) for d in data)
  
  
  def data_to_bar_data_array(data):
      return list(data_to_bar_data_row(row) for row in data)
  
  
  class MainWindow(QMainWindow):
  
      def __init__(self):
          super().__init__()
  
          self.setWindowTitle('Qt DataVisualization 3D Bars')
  
          self.bars = Q3DBars()
  
          self._column_axis = QCategory3DAxis()
          self._column_axis.setTitle('Columns')
          self._column_axis.setTitleVisible(True)
          self._column_axis.setLabels(['Column1', 'Column2'])
          self._column_axis.setLabelAutoRotation(30)
  
          self._row_axis = QCategory3DAxis()
          self._row_axis.setTitle('Rows')
          self._row_axis.setTitleVisible(True)
          self._row_axis.setLabels(['Row1', 'Row2'])
          self._row_axis.setLabelAutoRotation(30)
  
          self._value_axis = QValue3DAxis()
          self._value_axis.setTitle('Values')
          self._value_axis.setTitleVisible(True)
          self._value_axis.setRange(0, 5)
  
          self.bars.setRowAxis(self._row_axis)
          self.bars.setColumnAxis(self._column_axis)
          self.bars.setValueAxis(self._value_axis)
  
          self.series = QBar3DSeries()
          self._array_data = [[1, 2], [3, 4]]
          self.series.dataProxy().addRows(data_to_bar_data_array(self._array_data))
  
          self.bars.setPrimarySeries(self.series)
  
          self.container = QWidget.createWindowContainer(self.bars)
  
          if not self.bars.hasContext():
              print("Couldn't initialize the OpenGL context.")
              sys.exit(-1)
  
          camera = self.bars.scene().activeCamera()
          camera.setYRotation(22.5)
  
          geometry = QGuiApplication.primaryScreen().geometry()
          size = geometry.height() * 3 / 4
          self.container.setMinimumSize(size, size)
  
          self.container.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
          self.container.setFocusPolicy(Qt.StrongFocus)
          self.setCentralWidget(self.container)
  
  
  if __name__ == '__main__':
      app = QApplication(sys.argv)
      main_win = MainWindow()
      main_win.show()
      sys.exit(app.exec())
  