Aide pour OpenGL

**rambc** · 04/04/2009, 18h10

Bonjour,
j'ai essayé d'adapter le très bon code d'exemple "Hello GL" proposé par PyQT.
Je voudrais tracer deux triangles, l'un en rouge et l'autre en bleu. Malheureusement je n'y arrive pas.

Toute info. est la bienvenue.

Voici le code.

Code :

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#!/usr/bin/env python
 
"""PyQt4 port of the opengl/hellogl example from Qt v4.x"""
 
import sys
import math
from PyQt4 import QtCore, QtGui, QtOpenGL
 
try:
   from OpenGL import GL
except ImportError:
   app = QtGui.QApplication(sys.argv)
   QtGui.QMessageBox.critical(None, "OpenGL hellogl",
                           "PyOpenGL must be installed to run this example.",
                           QtGui.QMessageBox.Ok | QtGui.QMessageBox.Default,
                           QtGui.QMessageBox.NoButton)
   sys.exit(1)
 
 
class Window(QtGui.QWidget):
   def __init__(self, parent=None):
       QtGui.QWidget.__init__(self, parent)
 
       self.glWidget = GLWidget()
 
       self.xSlider = self.createSlider(QtCore.SIGNAL("xRotationChanged(int)"),
                                        self.glWidget.setXRotation)
       self.ySlider = self.createSlider(QtCore.SIGNAL("yRotationChanged(int)"),
                                        self.glWidget.setYRotation)
       self.zSlider = self.createSlider(QtCore.SIGNAL("zRotationChanged(int)"),
                                        self.glWidget.setZRotation)
 
       mainLayout = QtGui.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(self.tr("Hello GL"))
 
   def createSlider(self, changedSignal, setterSlot):
       slider = QtGui.QSlider(QtCore.Qt.Vertical)
 
       slider.setRange(0, 360 * 16)
       slider.setSingleStep(16)
       slider.setPageStep(15 * 16)
       slider.setTickInterval(15 * 16)
       slider.setTickPosition(QtGui.QSlider.TicksRight)
 
       self.glWidget.connect(slider, QtCore.SIGNAL("valueChanged(int)"), setterSlot)
       self.connect(self.glWidget, changedSignal, slider, QtCore.SLOT("setValue(int)"))
 
       return slider
 
 
class GLWidget(QtOpenGL.QGLWidget):
   def __init__(self, parent=None):
       QtOpenGL.QGLWidget.__init__(self, parent)
 
       self.object = 0
       self.xRot = 0
       self.yRot = 0
       self.zRot = 0
 
       self.lastPos = QtCore.QPoint()
 
       self.trolltechGreen = QtGui.QColor.fromCmykF(0.40, 0.0, 1.0, 0.0)
       self.trolltechPurple = QtGui.QColor.fromCmykF(0.39, 0.39, 0.0, 0.0)
 
   def xRotation(self):
       return self.xRot
 
   def yRotation(self):
       return self.yRot
 
   def zRotation(self):
       return self.zRot
 
   def minimumSizeHint(self):
       return QtCore.QSize(50, 50)
 
   def sizeHint(self):
       return QtCore.QSize(400, 400)
 
   def setXRotation(self, angle):
       angle = self.normalizeAngle(angle)
       if angle != self.xRot:
           self.xRot = angle
           self.emit(QtCore.SIGNAL("xRotationChanged(int)"), angle)
           self.updateGL()
 
   def setYRotation(self, angle):
       angle = self.normalizeAngle(angle)
       if angle != self.yRot:
           self.yRot = angle
           self.emit(QtCore.SIGNAL("yRotationChanged(int)"), angle)
           self.updateGL()
 
   def setZRotation(self, angle):
       angle = self.normalizeAngle(angle)
       if angle != self.zRot:
           self.zRot = angle
           self.emit(QtCore.SIGNAL("zRotationChanged(int)"), angle)
           self.updateGL()
 
   def initializeGL(self):
       self.qglClearColor(self.trolltechPurple.dark())
       self.object = self.makeObject()
       GL.glShadeModel(GL.GL_FLAT)
       GL.glEnable(GL.GL_DEPTH_TEST)
       GL.glEnable(GL.GL_CULL_FACE)
 
   def paintGL(self):
       GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
       GL.glLoadIdentity()
       GL.glTranslated(0.0, 0.0, -10.0)
       GL.glRotated(self.xRot / 16.0, 1.0, 0.0, 0.0)
       GL.glRotated(self.yRot / 16.0, 0.0, 1.0, 0.0)
       GL.glRotated(self.zRot / 16.0, 0.0, 0.0, 1.0)
       GL.glCallList(self.object)
 
   def resizeGL(self, width, height):
       side = min(width, height)
       GL.glViewport((width - side) / 2, (height - side) / 2, side, side)
 
       GL.glMatrixMode(GL.GL_PROJECTION)
       GL.glLoadIdentity()
       GL.glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0)
       GL.glMatrixMode(GL.GL_MODELVIEW)
 
   def mousePressEvent(self, event):
       self.lastPos = QtCore.QPoint(event.pos())
 
   def mouseMoveEvent(self, event):
       dx = event.x() - self.lastPos.x()
       dy = event.y() - self.lastPos.y()
 
       if event.buttons() & QtCore.Qt.LeftButton:
           self.setXRotation(self.xRot + 8 * dy)
           self.setYRotation(self.yRot + 8 * dx)
       elif event.buttons() & QtCore.Qt.RightButton:
           self.setXRotation(self.xRot + 8 * dy)
           self.setZRotation(self.zRot + 8 * dx)
 
       self.lastPos = QtCore.QPoint(event.pos())
 
   def makeObject(self):
       genList = GL.glGenLists(1)
       GL.glNewList(genList, GL.GL_COMPILE)
 
       GL.glBegin(GL.GL_QUADS)
 
       x1 = +0.06
       y1 = +0.06
       z1 = -0.54
 
       x2 = +0.14
       y2 = +0.06
       z2 = -0.54
 
       x3 = +0.08
       y3 = +0.00
       z3 = -0.54
 
              self.triangle(x1, y1, z1, x2, y2, z2, x3, y3, z3,255,0,0)
 
 
       GL.glBegin(GL.GL_QUADS)
              x1 = +0.06
       y1 = +0.06
       z1 = 0.54
              x2 = +0.14
       y2 = +0.06
       z2 = 0.54
              x3 = +0.08
       y3 = +0.00
       z3 = 0.54
              self.triangle(x1, y1, z1, x2, y2, z2, x3, y3, z3,0,0,255)
              GL.glEnd()
       GL.glEndList()
 
       return genList
 
   def triangle(self, x1, y1, z1, x2, y2, z2, x3, y3, z3,r,g,b):
       self.qglColor(QtGui.QColor(r,g,b))
 
       GL.glVertex3d(x1, y1, z1)
       GL.glVertex3d(x2, y2, z2)
       GL.glVertex3d(x3, y3, z3)
 
 
   def extrude(self, x1, y1, x2, y2):
       self.qglColor(self.trolltechGreen.dark(250 + int(100 * x1)))
 
       GL.glVertex3d(x1, y1, +0.05)
       GL.glVertex3d(x2, y2, +0.05)
       GL.glVertex3d(x2, y2, -0.05)
       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
 
 
if __name__ == '__main__':
   app = QtGui.QApplication(sys.argv)
   window = Window()
   window.show()
   sys.exit(app.exec_())

**rambc** · 04/04/2009, 18h38

En fait il faut changer makeObject et triangle comme suit.

Code :

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    def makeObject(self):
        genList = GL.glGenLists(1)
        GL.glNewList(genList, GL.GL_COMPILE)
 
        x1 = +0.06
        y1 = +0.06
        z1 = -0.54
 
        x2 = +0.14
        y2 = +0.06
        z2 = -0.54
 
        x3 = +0.08
        y3 = +0.00
        z3 = -0.54
 
 
        self.triangle(x1, y1, z1, x2, y2, z2, x3, y3, z3,255,0,0)
 
 
        x1 = +0.06
        y1 = +0.06
        z1 = 0.54
 
        x2 = +0.14
        y2 = +0.06
        z2 = 0.54
 
        x3 = +0.08
        y3 = +0.00
        z3 = 0.54
 
        self.triangle(x1, y1, z1, x2, y2, z2, x3, y3, z3,0,0,255)
 
        GL.glEndList()
 
        return genList
 
    def triangle(self, x1, y1, z1, x2, y2, z2, x3, y3, z3,r,g,b):
        self.qglColor(QtGui.QColor(r,g,b))
        GL.glBegin(GL.GL_TRIANGLES)
        GL.glVertex3d(x1, y1, z1)
        GL.glVertex3d(x2, y2, z2)
        GL.glVertex3d(x3, y3, z3)
        GL.glEnd()

**rambc** · 04/04/2009, 18h53

Le code suivant produit un hideux dessin mais qui contient plein de triangles. J'ai testé avec 6000 est la fabrication est très rapide.

Code :

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#!/usr/bin/env python
 
"""PyQt4 port of the opengl/hellogl example from Qt v4.x"""
 
import sys
import math, random
from PyQt4 import QtCore, QtGui, QtOpenGL
 
try:
    from OpenGL import GL
except ImportError:
    app = QtGui.QApplication(sys.argv)
    QtGui.QMessageBox.critical(None, "OpenGL hellogl",
                            "PyOpenGL must be installed to run this example.",
                            QtGui.QMessageBox.Ok | QtGui.QMessageBox.Default,
                            QtGui.QMessageBox.NoButton)
    sys.exit(1)
 
 
class Window(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
 
        self.glWidget = GLWidget()
 
        self.xSlider = self.createSlider(QtCore.SIGNAL("xRotationChanged(int)"),
                                         self.glWidget.setXRotation)
        self.ySlider = self.createSlider(QtCore.SIGNAL("yRotationChanged(int)"),
                                         self.glWidget.setYRotation)
        self.zSlider = self.createSlider(QtCore.SIGNAL("zRotationChanged(int)"),
                                         self.glWidget.setZRotation)
 
        mainLayout = QtGui.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(self.tr("Hello GL"))
 
    def createSlider(self, changedSignal, setterSlot):
        slider = QtGui.QSlider(QtCore.Qt.Vertical)
 
        slider.setRange(0, 360 * 16)
        slider.setSingleStep(16)
        slider.setPageStep(15 * 16)
        slider.setTickInterval(15 * 16)
        slider.setTickPosition(QtGui.QSlider.TicksRight)
 
        self.glWidget.connect(slider, QtCore.SIGNAL("valueChanged(int)"), setterSlot)
        self.connect(self.glWidget, changedSignal, slider, QtCore.SLOT("setValue(int)"))
 
        return slider
 
 
class GLWidget(QtOpenGL.QGLWidget):
    def __init__(self, parent=None):
        QtOpenGL.QGLWidget.__init__(self, parent)
 
        self.object = 0
        self.xRot = 0
        self.yRot = 0
        self.zRot = 0
 
        self.lastPos = QtCore.QPoint()
 
        self.trolltechGreen = QtGui.QColor.fromCmykF(0.40, 0.0, 1.0, 0.0)
        self.trolltechPurple = QtGui.QColor.fromCmykF(0.39, 0.39, 0.0, 0.0)
 
    def xRotation(self):
        return self.xRot
 
    def yRotation(self):
        return self.yRot
 
    def zRotation(self):
        return self.zRot
 
    def minimumSizeHint(self):
        return QtCore.QSize(50, 50)
 
    def sizeHint(self):
        return QtCore.QSize(400, 400)
 
    def setXRotation(self, angle):
        angle = self.normalizeAngle(angle)
        if angle != self.xRot:
            self.xRot = angle
            self.emit(QtCore.SIGNAL("xRotationChanged(int)"), angle)
            self.updateGL()
 
    def setYRotation(self, angle):
        angle = self.normalizeAngle(angle)
        if angle != self.yRot:
            self.yRot = angle
            self.emit(QtCore.SIGNAL("yRotationChanged(int)"), angle)
            self.updateGL()
 
    def setZRotation(self, angle):
        angle = self.normalizeAngle(angle)
        if angle != self.zRot:
            self.zRot = angle
            self.emit(QtCore.SIGNAL("zRotationChanged(int)"), angle)
            self.updateGL()
 
    def initializeGL(self):
        self.qglClearColor(self.trolltechPurple.dark())
        self.object = self.makeObject()
        GL.glShadeModel(GL.GL_FLAT)
        GL.glEnable(GL.GL_DEPTH_TEST)
        GL.glEnable(GL.GL_CULL_FACE)
 
    def paintGL(self):
        GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
        GL.glLoadIdentity()
        GL.glTranslated(0.0, 0.0, -10.0)
        GL.glRotated(self.xRot / 16.0, 1.0, 0.0, 0.0)
        GL.glRotated(self.yRot / 16.0, 0.0, 1.0, 0.0)
        GL.glRotated(self.zRot / 16.0, 0.0, 0.0, 1.0)
        GL.glCallList(self.object)
 
    def resizeGL(self, width, height):
        side = min(width, height)
        GL.glViewport((width - side) / 2, (height - side) / 2, side, side)
 
        GL.glMatrixMode(GL.GL_PROJECTION)
        GL.glLoadIdentity()
        GL.glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0)
        GL.glMatrixMode(GL.GL_MODELVIEW)
 
    def mousePressEvent(self, event):
        self.lastPos = QtCore.QPoint(event.pos())
 
    def mouseMoveEvent(self, event):
        dx = event.x() - self.lastPos.x()
        dy = event.y() - self.lastPos.y()
 
        if event.buttons() & QtCore.Qt.LeftButton:
            self.setXRotation(self.xRot + 8 * dy)
            self.setYRotation(self.yRot + 8 * dx)
        elif event.buttons() & QtCore.Qt.RightButton:
            self.setXRotation(self.xRot + 8 * dy)
            self.setZRotation(self.zRot + 8 * dx)
 
        self.lastPos = QtCore.QPoint(event.pos())
 
    def makeObject(self):
        genList = GL.glGenLists(1)
        GL.glNewList(genList, GL.GL_COMPILE)
 
        x=[0,0,0]
        y=[0,0,0]
        z=[0,0,0]
 
        for i in range(1000):
            for j in range(3):
                x[j] = -0.16 + 0.16*random.random()
                y[j] = +0.06 - 0.06*random.random()
                z[j] = -0.54 + 0.54*random.random()
 
            self.triangle(x[0], y[0], z[0], x[1], y[1], z[1], x[2], y[2], z[2], random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))
 
        GL.glEndList()
 
        return genList
 
    def triangle(self, x1, y1, z1, x2, y2, z2, x3, y3, z3,r,g,b):
        self.qglColor(QtGui.QColor(r,g,b))
        GL.glBegin(GL.GL_TRIANGLES)
        GL.glVertex3d(x1, y1, z1)
        GL.glVertex3d(x2, y2, z2)
        GL.glVertex3d(x3, y3, z3)
        GL.glEnd()
 
 
 
    def extrude(self, x1, y1, x2, y2):
        self.qglColor(self.trolltechGreen.dark(250 + int(100 * x1)))
 
        GL.glVertex3d(x1, y1, +0.05)
        GL.glVertex3d(x2, y2, +0.05)
        GL.glVertex3d(x2, y2, -0.05)
        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
 
 
if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

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