text: #!/usr/bin/env python
  
  
  #############################################################################
  ##
  ## Copyright (C) 2018 Riverbank Computing Limited.
  ## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  ## All rights reserved.
  ##
  ## This file is part of the examples of PyQt.
  ##
  ## $QT_BEGIN_LICENSE:BSD$
  ## You may use this file under the terms of the BSD license as follows:
  ##
  ## "Redistribution and use in source and binary forms, with or without
  ## modification, are permitted provided that the following conditions are
  ## met:
  ##   * Redistributions of source code must retain the above copyright
  ##     notice, this list of conditions and the following disclaimer.
  ##   * Redistributions in binary form must reproduce the above copyright
  ##     notice, this list of conditions and the following disclaimer in
  ##     the documentation and/or other materials provided with the
  ##     distribution.
  ##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
  ##     the names of its contributors may be used to endorse or promote
  ##     products derived from this software without specific prior written
  ##     permission.
  ##
  ## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  ## $QT_END_LICENSE$
  ##
  #############################################################################
  
  
  import sys
  import math
  
  from PySide2.QtCore import pyqtSignal, QPoint, QSize, Qt
  from PySide2.QtGui import QColor, QOpenGLVersionProfile
  from PySide2.QtWidgets import (QApplication, QHBoxLayout, QOpenGLWidget, QSlider,
          QWidget)
  
  
  class Window(QWidget):
      def __init__(self):
          super(Window, self).__init__()
  
          self.glWidget = GLWidget()
  
          self.xSlider = self.createSlider()
          self.ySlider = self.createSlider()
          self.zSlider = self.createSlider()
  
          self.xSlider.valueChanged.connect(self.glWidget.setXRotation)
          self.glWidget.xRotationChanged.connect(self.xSlider.setValue)
          self.ySlider.valueChanged.connect(self.glWidget.setYRotation)
          self.glWidget.yRotationChanged.connect(self.ySlider.setValue)
          self.zSlider.valueChanged.connect(self.glWidget.setZRotation)
          self.glWidget.zRotationChanged.connect(self.zSlider.setValue)
  
          mainLayout = QHBoxLayout()
          mainLayout.addWidget(self.glWidget)
          mainLayout.addWidget(self.xSlider)
          mainLayout.addWidget(self.ySlider)
          mainLayout.addWidget(self.zSlider)
          self.setLayout(mainLayout)
  
          self.xSlider.setValue(15 * 16)
          self.ySlider.setValue(345 * 16)
          self.zSlider.setValue(0 * 16)
  
          self.setWindowTitle("Hello GL")
  
      def createSlider(self):
          slider = QSlider(Qt.Vertical)
  
          slider.setRange(0, 360 * 16)
          slider.setSingleStep(16)
          slider.setPageStep(15 * 16)
          slider.setTickInterval(15 * 16)
          slider.setTickPosition(QSlider.TicksRight)
  
          return slider
  
  
  class GLWidget(QOpenGLWidget):
      xRotationChanged = pyqtSignal(int)
      yRotationChanged = pyqtSignal(int)
      zRotationChanged = pyqtSignal(int)
  
      def __init__(self, parent=None):
          super(GLWidget, self).__init__(parent)
  
          self.object = 0
          self.xRot = 0
          self.yRot = 0
          self.zRot = 0
  
          self.lastPos = QPoint()
  
          self.trolltechGreen = QColor.fromCmykF(0.40, 0.0, 1.0, 0.0)
          self.trolltechPurple = QColor.fromCmykF(0.39, 0.39, 0.0, 0.0)
  
      def minimumSizeHint(self):
          return QSize(50, 50)
  
      def sizeHint(self):
          return QSize(400, 400)
  
      def setXRotation(self, angle):
          angle = self.normalizeAngle(angle)
          if angle != self.xRot:
              self.xRot = angle
              self.xRotationChanged.emit(angle)
              self.update()
  
      def setYRotation(self, angle):
          angle = self.normalizeAngle(angle)
          if angle != self.yRot:
              self.yRot = angle
              self.yRotationChanged.emit(angle)
              self.update()
  
      def setZRotation(self, angle):
          angle = self.normalizeAngle(angle)
          if angle != self.zRot:
              self.zRot = angle
              self.zRotationChanged.emit(angle)
              self.update()
  
      def initializeGL(self):
          version_profile = QOpenGLVersionProfile()
          version_profile.setVersion(2, 0)
          self.gl = self.context().versionFunctions(version_profile)
          self.gl.initializeOpenGLFunctions()
  
          self.setClearColor(self.trolltechPurple.darker())
          self.object = self.makeObject()
          self.gl.glShadeModel(self.gl.GL_FLAT)
          self.gl.glEnable(self.gl.GL_DEPTH_TEST)
          self.gl.glEnable(self.gl.GL_CULL_FACE)
  
      def paintGL(self):
          self.gl.glClear(
                  self.gl.GL_COLOR_BUFFER_BIT | self.gl.GL_DEPTH_BUFFER_BIT)
          self.gl.glLoadIdentity()
          self.gl.glTranslated(0.0, 0.0, -10.0)
          self.gl.glRotated(self.xRot / 16.0, 1.0, 0.0, 0.0)
          self.gl.glRotated(self.yRot / 16.0, 0.0, 1.0, 0.0)
          self.gl.glRotated(self.zRot / 16.0, 0.0, 0.0, 1.0)
          self.gl.glCallList(self.object)
  
      def resizeGL(self, width, height):
          side = min(width, height)
          if side < 0:
              return
  
          self.gl.glViewport((width - side) // 2, (height - side) // 2, side,
                  side)
  
          self.gl.glMatrixMode(self.gl.GL_PROJECTION)
          self.gl.glLoadIdentity()
          self.gl.glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0)
          self.gl.glMatrixMode(self.gl.GL_MODELVIEW)
  
      def mousePressEvent(self, event):
          self.lastPos = event.pos()
  
      def mouseMoveEvent(self, event):
          dx = event.x() - self.lastPos.x()
          dy = event.y() - self.lastPos.y()
  
          if event.buttons() & Qt.LeftButton:
              self.setXRotation(self.xRot + 8 * dy)
              self.setYRotation(self.yRot + 8 * dx)
          elif event.buttons() & Qt.RightButton:
              self.setXRotation(self.xRot + 8 * dy)
              self.setZRotation(self.zRot + 8 * dx)
  
          self.lastPos = event.pos()
  
      def makeObject(self):
          genList = self.gl.glGenLists(1)
          self.gl.glNewList(genList, self.gl.GL_COMPILE)
  
          self.gl.glBegin(self.gl.GL_QUADS)
  
          x1 = +0.06
          y1 = -0.14
          x2 = +0.14
          y2 = -0.06
          x3 = +0.08
          y3 = +0.00
          x4 = +0.30
          y4 = +0.22
  
          self.quad(x1, y1, x2, y2, y2, x2, y1, x1)
          self.quad(x3, y3, x4, y4, y4, x4, y3, x3)
  
          self.extrude(x1, y1, x2, y2)
          self.extrude(x2, y2, y2, x2)
          self.extrude(y2, x2, y1, x1)
          self.extrude(y1, x1, x1, y1)
          self.extrude(x3, y3, x4, y4)
          self.extrude(x4, y4, y4, x4)
          self.extrude(y4, x4, y3, x3)
  
          NumSectors = 200
  
          for i in range(NumSectors):
              angle1 = (i * 2 * math.pi) / NumSectors
              x5 = 0.30 * math.sin(angle1)
              y5 = 0.30 * math.cos(angle1)
              x6 = 0.20 * math.sin(angle1)
              y6 = 0.20 * math.cos(angle1)
  
              angle2 = ((i + 1) * 2 * math.pi) / NumSectors
              x7 = 0.20 * math.sin(angle2)
              y7 = 0.20 * math.cos(angle2)
              x8 = 0.30 * math.sin(angle2)
              y8 = 0.30 * math.cos(angle2)
  
              self.quad(x5, y5, x6, y6, x7, y7, x8, y8)
  
              self.extrude(x6, y6, x7, y7)
              self.extrude(x8, y8, x5, y5)
  
          self.gl.glEnd()
          self.gl.glEndList()
  
          return genList
  
      def quad(self, x1, y1, x2, y2, x3, y3, x4, y4):
          self.setColor(self.trolltechGreen)
  
          self.gl.glVertex3d(x1, y1, -0.05)
          self.gl.glVertex3d(x2, y2, -0.05)
          self.gl.glVertex3d(x3, y3, -0.05)
          self.gl.glVertex3d(x4, y4, -0.05)
  
          self.gl.glVertex3d(x4, y4, +0.05)
          self.gl.glVertex3d(x3, y3, +0.05)
          self.gl.glVertex3d(x2, y2, +0.05)
          self.gl.glVertex3d(x1, y1, +0.05)
  
      def extrude(self, x1, y1, x2, y2):
          self.setColor(self.trolltechGreen.darker(250 + int(100 * x1)))
  
          self.gl.glVertex3d(x1, y1, +0.05)
          self.gl.glVertex3d(x2, y2, +0.05)
          self.gl.glVertex3d(x2, y2, -0.05)
          self.gl.glVertex3d(x1, y1, -0.05)
  
      def normalizeAngle(self, angle):
          while angle < 0:
              angle += 360 * 16
          while angle > 360 * 16:
              angle -= 360 * 16
          return angle
  
      def setClearColor(self, c):
          self.gl.glClearColor(c.redF(), c.greenF(), c.blueF(), c.alphaF())
  
      def setColor(self, c):
          self.gl.glColor4f(c.redF(), c.greenF(), c.blueF(), c.alphaF())
  
  
  if __name__ == '__main__':
  
      app = QApplication(sys.argv)
      window = Window()
      window.show()
      sys.exit(app.exec_())
  