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#!/usr/bin/env python
"""PyQt4 port of the opengl/samplebuffers 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 samplebuffers",
"PyOpenGL must be installed to run this example.")
sys.exit(1)
class GLWidget(QtOpenGL.QGLWidget):
GL_MULTISAMPLE = 0x809D
rot = 0.0
def __init__(self, parent):
super(GLWidget, self).__init__(QtOpenGL.QGLFormat(QtOpenGL.QGL.SampleBuffers), parent)
self.list_ = []
self.startTimer(40)
self.setWindowTitle("Sample Buffers")
def initializeGL(self):
GL.glMatrixMode(GL.GL_PROJECTION)
GL.glLoadIdentity()
GL.glOrtho( -.5, .5, .5, -.5, -1000, 1000)
GL.glMatrixMode(GL.GL_MODELVIEW)
GL.glLoadIdentity()
GL.glClearColor(1.0, 1.0, 1.0, 1.0)
self.makeObject()
def resizeGL(self, w, h):
GL.glViewport(0, 0, w, h)
def paintGL(self):
GL.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT)
GL.glMatrixMode(GL.GL_MODELVIEW)
GL.glPushMatrix()
GL.glEnable(GLWidget.GL_MULTISAMPLE)
GL.glTranslatef( -0.25, -0.10, 0.0)
GL.glScalef(0.75, 1.15, 0.0)
GL.glRotatef(GLWidget.rot, 0.0, 0.0, 1.0)
GL.glCallList(self.list_)
GL.glPopMatrix()
GL.glPushMatrix()
GL.glDisable(GLWidget.GL_MULTISAMPLE)
GL.glTranslatef(0.25, -0.10, 0.0)
GL.glScalef(0.75, 1.15, 0.0)
GL.glRotatef(GLWidget.rot, 0.0, 0.0, 1.0)
GL.glCallList(self.list_)
GL.glPopMatrix()
GLWidget.rot += 0.2
self.qglColor(QtCore.Qt.black)
self.renderText(-0.35, 0.4, 0.0, "Multisampling enabled")
self.renderText(0.15, 0.4, 0.0, "Multisampling disabled")
def timerEvent(self, event):
self.update()
def makeObject(self):
trolltechGreen = QtGui.QColor.fromCmykF(0.40, 0.0, 1.0, 0.0)
NumSectors = 15
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.list_ = GL.glGenLists(1)
GL.glNewList(self.list_, GL.GL_COMPILE)
for i in range(NumSectors):
angle1 = float((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 = float(((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.qglColor(trolltechGreen)
self.quad(GL.GL_QUADS, x5, y5, x6, y6, x7, y7, x8, y8)
self.qglColor(QtCore.Qt.black)
self.quad(GL.GL_LINE_LOOP, x5, y5, x6, y6, x7, y7, x8, y8)
self.qglColor(trolltechGreen)
self.quad(GL.GL_QUADS, x1, y1, x2, y2, y2, x2, y1, x1)
self.quad(GL.GL_QUADS, x3, y3, x4, y4, y4, x4, y3, x3)
self.qglColor(QtCore.Qt.black)
self.quad(GL.GL_LINE_LOOP, x1, y1, x2, y2, y2, x2, y1, x1)
self.quad(GL.GL_LINE_LOOP, x3, y3, x4, y4, y4, x4, y3, x3)
GL.glEndList()
def quad(self, primitive, x1, y1, x2, y2, x3, y3, x4, y4):
GL.glBegin(primitive)
GL.glVertex2d(x1, y1)
GL.glVertex2d(x2, y2)
GL.glVertex2d(x3, y3)
GL.glVertex2d(x4, y4)
GL.glEnd()
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
f = QtOpenGL.QGLFormat.defaultFormat()
f.setSampleBuffers(True)
QtOpenGL.QGLFormat.setDefaultFormat(f)
if not QtOpenGL.QGLFormat.hasOpenGL():
QtGui.QMessageBox.information(None, "OpenGL samplebuffers",
"This system does not support OpenGL.")
sys.exit(0)
widget = GLWidget(None)
if not widget.format().sampleBuffers():
QtGui.QMessageBox.information(None, "OpenGL samplebuffers",
"This system does not have sample buffer support.")
sys.exit(0)
widget.resize(640, 480)
widget.show()
sys.exit(app.exec_())
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