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pyqt example hellogl (snippet)

Author
compilerboiler
Published
2020/02/10
Updated
2020/03/14
python
Article Outline

Python pyqt (gui) example 'hellogl'

Modules used in program:

  • import math
  • import sys

hellogl

Python pyqt example: hellogl

#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2015 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 PyQt5.QtCore import pyqtSignal, QPoint, QSize, Qt
from PyQt5.QtGui import QColor
from PyQt5.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):
        self.gl = self.context().versionFunctions()
        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_())
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