#!/usr/bin/env python
 
 
#############################################################################
##
## Copyright (C) 2013 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.
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##   * 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
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##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
##     the names of its contributors may be used to endorse or promote
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#############################################################################
 
 
import sys
import math
 
from PyQt5.QtCore import pyqtSignal, QRegExp, QSize, Qt, QTimer
from PyQt5.QtGui import QPixmap
from PyQt5.QtWidgets import (QAction, QApplication, QGridLayout, QInputDialog,
        QLabel, QLineEdit, QMainWindow, QMessageBox, QScrollArea, QSizePolicy,
        QSlider, QWidget)
from PyQt5.QtOpenGL import QGLWidget
 
try:
    from OpenGL.GL import *
except ImportError:
    app = QApplication(sys.argv)
    QMessageBox.critical(None, "OpenGL grabber",
            "PyOpenGL must be installed to run this example.")
    sys.exit(1)
 
 
class GLWidget(QGLWidget):
    xRotationChanged = pyqtSignal(int)
    yRotationChanged = pyqtSignal(int)
    zRotationChanged = pyqtSignal(int)
 
    def __init__(self, parent=None):
        super(GLWidget, self).__init__(parent)
 
        self.gear1 = 0
        self.gear2 = 0
        self.gear3 = 0
        self.xRot = 0
        self.yRot = 0
        self.zRot = 0
        self.gear1Rot = 0
 
        timer = QTimer(self)
        timer.timeout.connect(self.advanceGears)
        timer.start(20)
 
    def setXRotation(self, angle):
        self.normalizeAngle(angle)
 
        if angle != self.xRot:
            self.xRot = angle
            self.xRotationChanged.emit(angle)
            self.updateGL()
 
    def setYRotation(self, angle):
        self.normalizeAngle(angle)
 
        if angle != self.yRot:
            self.yRot = angle
            self.yRotationChanged.emit(angle)
            self.updateGL()
 
    def setZRotation(self, angle):
        self.normalizeAngle(angle)
 
        if angle != self.zRot:
            self.zRot = angle
            self.zRotationChanged.emit(angle)
            self.updateGL()
 
    def initializeGL(self):
        lightPos = (5.0, 5.0, 10.0, 1.0)
        reflectance1 = (0.8, 0.1, 0.0, 1.0)
        reflectance2 = (0.0, 0.8, 0.2, 1.0)
        reflectance3 = (0.2, 0.2, 1.0, 1.0)
 
        glLightfv(GL_LIGHT0, GL_POSITION, lightPos)
        glEnable(GL_LIGHTING)
        glEnable(GL_LIGHT0)
        glEnable(GL_DEPTH_TEST)
 
        self.gear1 = self.makeGear(reflectance1, 1.0, 4.0, 1.0, 0.7, 20)
        self.gear2 = self.makeGear(reflectance2, 0.5, 2.0, 2.0, 0.7, 10)
        self.gear3 = self.makeGear(reflectance3, 1.3, 2.0, 0.5, 0.7, 10)
 
        glEnable(GL_NORMALIZE)
        glClearColor(0.0, 0.0, 0.0, 1.0)
 
    def paintGL(self):
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
 
        glPushMatrix()
        glRotated(self.xRot / 16.0, 1.0, 0.0, 0.0)
        glRotated(self.yRot / 16.0, 0.0, 1.0, 0.0)
        glRotated(self.zRot / 16.0, 0.0, 0.0, 1.0)
 
        self.drawGear(self.gear1, -3.0, -2.0, 0.0, self.gear1Rot / 16.0)
        self.drawGear(self.gear2, +3.1, -2.0, 0.0,
                -2.0 * (self.gear1Rot / 16.0) - 9.0)
 
        glRotated(+90.0, 1.0, 0.0, 0.0)
        self.drawGear(self.gear3, -3.1, -1.8, -2.2,
                +2.0 * (self.gear1Rot / 16.0) - 2.0)
 
        glPopMatrix()
 
    def resizeGL(self, width, height):
        side = min(width, height)
        if side < 0:
            return
 
        glViewport((width - side) // 2, (height - side) // 2, side, side)
 
        glMatrixMode(GL_PROJECTION)
        glLoadIdentity()
        glFrustum(-1.0, +1.0, -1.0, 1.0, 5.0, 60.0)
        glMatrixMode(GL_MODELVIEW)
        glLoadIdentity()
        glTranslated(0.0, 0.0, -40.0)
 
    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 advanceGears(self):
        self.gear1Rot += 2 * 16
        self.updateGL()    
 
    def xRotation(self):
        return self.xRot
 
    def yRotation(self):
        return self.yRot
 
    def zRotation(self):
        return self.zRot
 
    def makeGear(self, reflectance, innerRadius, outerRadius, thickness, toothSize, toothCount):
        list = glGenLists(1)
        glNewList(list, GL_COMPILE)
        glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, reflectance)
 
        r0 = innerRadius
        r1 = outerRadius - toothSize / 2.0
        r2 = outerRadius + toothSize / 2.0
        delta = (2.0 * math.pi / toothCount) / 4.0
        z = thickness / 2.0
 
        glShadeModel(GL_FLAT)
 
        for i in range(2):
            if i == 0:
                sign = +1.0
            else:
                sign = -1.0
 
            glNormal3d(0.0, 0.0, sign)
 
            glBegin(GL_QUAD_STRIP)
 
            for j in range(toothCount+1):
                angle = 2.0 * math.pi * j / toothCount
                glVertex3d(r0 * math.cos(angle), r0 * math.sin(angle), sign * z)
                glVertex3d(r1 * math.cos(angle), r1 * math.sin(angle), sign * z)
                glVertex3d(r0 * math.cos(angle), r0 * math.sin(angle), sign * z)
                glVertex3d(r1 * math.cos(angle + 3 * delta), r1 * math.sin(angle + 3 * delta), sign * z)
 
            glEnd()
 
            glBegin(GL_QUADS)
 
            for j in range(toothCount):
                angle = 2.0 * math.pi * j / toothCount                
                glVertex3d(r1 * math.cos(angle), r1 * math.sin(angle), sign * z)
                glVertex3d(r2 * math.cos(angle + delta), r2 * math.sin(angle + delta), sign * z)
                glVertex3d(r2 * math.cos(angle + 2 * delta), r2 * math.sin(angle + 2 * delta), sign * z)
                glVertex3d(r1 * math.cos(angle + 3 * delta), r1 * math.sin(angle + 3 * delta), sign * z)
 
            glEnd()
 
        glBegin(GL_QUAD_STRIP)
 
        for i in range(toothCount):
            for j in range(2):
                angle = 2.0 * math.pi * (i + (j / 2.0)) / toothCount
                s1 = r1
                s2 = r2
 
                if j == 1:
                    s1, s2 = s2, s1
 
                glNormal3d(math.cos(angle), math.sin(angle), 0.0)
                glVertex3d(s1 * math.cos(angle), s1 * math.sin(angle), +z)
                glVertex3d(s1 * math.cos(angle), s1 * math.sin(angle), -z)
 
                glNormal3d(s2 * math.sin(angle + delta) - s1 * math.sin(angle), s1 * math.cos(angle) - s2 * math.cos(angle + delta), 0.0)
                glVertex3d(s2 * math.cos(angle + delta), s2 * math.sin(angle + delta), +z)
                glVertex3d(s2 * math.cos(angle + delta), s2 * math.sin(angle + delta), -z)
 
        glVertex3d(r1, 0.0, +z)
        glVertex3d(r1, 0.0, -z)
        glEnd()
 
        glShadeModel(GL_SMOOTH)
 
        glBegin(GL_QUAD_STRIP)
 
        for i in range(toothCount+1):
            angle = i * 2.0 * math.pi / toothCount
            glNormal3d(-math.cos(angle), -math.sin(angle), 0.0)
            glVertex3d(r0 * math.cos(angle), r0 * math.sin(angle), +z)
            glVertex3d(r0 * math.cos(angle), r0 * math.sin(angle), -z)
 
        glEnd()
 
        glEndList()
 
        return list    
 
    def drawGear(self, gear, dx, dy, dz, angle):
        glPushMatrix()
        glTranslated(dx, dy, dz)
        glRotated(angle, 0.0, 0.0, 1.0)
        glCallList(gear)
        glPopMatrix()
 
    def normalizeAngle(self, angle):
        while (angle < 0):
            angle += 360 * 16
 
        while (angle > 360 * 16):
            angle -= 360 * 16
 
 
class MainWindow(QMainWindow):
    def __init__(self):        
        super(MainWindow, self).__init__()
 
        centralWidget = QWidget()
        self.setCentralWidget(centralWidget)
 
        self.glWidget = GLWidget()
        self.pixmapLabel = QLabel()
 
        self.glWidgetArea = QScrollArea()
        self.glWidgetArea.setWidget(self.glWidget)
        self.glWidgetArea.setWidgetResizable(True)
        self.glWidgetArea.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.glWidgetArea.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.glWidgetArea.setSizePolicy(QSizePolicy.Ignored,
                QSizePolicy.Ignored)
        self.glWidgetArea.setMinimumSize(50, 50)
 
        self.pixmapLabelArea = QScrollArea()
        self.pixmapLabelArea.setWidget(self.pixmapLabel)
        self.pixmapLabelArea.setSizePolicy(QSizePolicy.Ignored,
                QSizePolicy.Ignored)
        self.pixmapLabelArea.setMinimumSize(50, 50)
 
        xSlider = self.createSlider(self.glWidget.xRotationChanged,
                self.glWidget.setXRotation)
        ySlider = self.createSlider(self.glWidget.yRotationChanged,
                self.glWidget.setYRotation)
        zSlider = self.createSlider(self.glWidget.zRotationChanged,
                self.glWidget.setZRotation)
 
        self.createActions()
        self.createMenus()
 
        centralLayout = QGridLayout()
        centralLayout.addWidget(self.glWidgetArea, 0, 0)
        centralLayout.addWidget(self.pixmapLabelArea, 0, 1)
        centralLayout.addWidget(xSlider, 1, 0, 1, 2)
        centralLayout.addWidget(ySlider, 2, 0, 1, 2)
        centralLayout.addWidget(zSlider, 3, 0, 1, 2)
        centralWidget.setLayout(centralLayout)
 
        xSlider.setValue(15 * 16)
        ySlider.setValue(345 * 16)
        zSlider.setValue(0 * 16)
 
        self.setWindowTitle("Grabber")
        self.resize(400, 300)
 
    def renderIntoPixmap(self):
        size = self.getSize()
 
        if size.isValid():
            pixmap = self.glWidget.renderPixmap(size.width(), size.height())
            self.setPixmap(pixmap)
 
    def grabFrameBuffer(self):
        image = self.glWidget.grabFrameBuffer()
        self.setPixmap(QPixmap.fromImage(image))
 
    def clearPixmap(self):
        self.setPixmap(QPixmap())
 
    def about(self):
        QMessageBox.about(self, "About Grabber",
                "The <b>Grabber</b> example demonstrates two approaches for "
                "rendering OpenGL into a Qt pixmap.")
 
    def createActions(self):
        self.renderIntoPixmapAct = QAction("&Render into Pixmap...",
                self, shortcut="Ctrl+R", triggered=self.renderIntoPixmap)
 
        self.grabFrameBufferAct = QAction("&Grab Frame Buffer", self,
                shortcut="Ctrl+G", triggered=self.grabFrameBuffer)
 
        self.clearPixmapAct = QAction("&Clear Pixmap", self,
                shortcut="Ctrl+L", triggered=self.clearPixmap)
 
        self.exitAct = QAction("E&xit", self, shortcut="Ctrl+Q",
                triggered=self.close)
 
        self.aboutAct = QAction("&About", self, triggered=self.about)
 
        self.aboutQtAct = QAction("About &Qt", self,
                triggered=QApplication.instance().aboutQt)
 
    def createMenus(self):
        self.fileMenu = self.menuBar().addMenu("&File")
        self.fileMenu.addAction(self.renderIntoPixmapAct)
        self.fileMenu.addAction(self.grabFrameBufferAct)
        self.fileMenu.addAction(self.clearPixmapAct)
        self.fileMenu.addSeparator()
        self.fileMenu.addAction(self.exitAct)
 
        self.helpMenu = self.menuBar().addMenu("&Help")
        self.helpMenu.addAction(self.aboutAct)
        self.helpMenu.addAction(self.aboutQtAct)
 
    def createSlider(self, changedSignal, setterSlot):
        slider = QSlider(Qt.Horizontal)
        slider.setRange(0, 360 * 16)
        slider.setSingleStep(16)
        slider.setPageStep(15 * 16)
        slider.setTickInterval(15 * 16)
        slider.setTickPosition(QSlider.TicksRight)
 
        slider.valueChanged.connect(setterSlot)
        changedSignal.connect(slider.setValue)
 
        return slider
 
    def setPixmap(self, pixmap):
        self.pixmapLabel.setPixmap(pixmap)
        size = pixmap.size()
 
        if size - QSize(1, 0) == self.pixmapLabelArea.maximumViewportSize():
            size -= QSize(1, 0)
 
        self.pixmapLabel.resize(size)
 
    def getSize(self):
        text, ok = QInputDialog.getText(self, "Grabber",
                "Enter pixmap size:", QLineEdit.Normal,
                "%d x %d" % (self.glWidget.width(), self.glWidget.height()))
 
        if not ok:
            return QSize()
 
        regExp = QRegExp(r'([0-9]+) *x *([0-9]+)')
 
        if regExp.exactMatch(text):
            width = int(regExp.cap(1))
            height = int(regExp.cap(2))
            if width > 0 and width < 2048 and height > 0 and height < 2048:
                return QSize(width, height)
 
        return self.glWidget.size()
 
 
if __name__ == '__main__':
 
    app = QApplication(sys.argv)
    mainWin = MainWindow()
    mainWin.show()
    sys.exit(app.exec_())