python opengl examples (multiple windows, multithreading)

py_tutorials/opengl.py

@@ -2,112 +2,76 @@ from netgen.csg import *
 import netgen.meshing as meshing
 import libvisual
 
-from OpenGL.GL import *
-from OpenGL.GLU import *
 from OpenGL.GLUT import *
 
-
+# import Window class from other file
+from opengl_window import Window
 
 sp1 = Sphere (Pnt(0,0,0), 0.2)
 sp2 = Sphere (Pnt(0.5,0,0), 0.2)
-
 all = sp1+sp2
 
-
 geom = CSGeometry()
 geom.Add (all)
 
-
 param = meshing.MeshingParameters()
 param.maxh = 0.1
 m1 = GenerateMesh (geom, param)
 
-
-
-vismesh = libvisual.meshvis.VS(m1)
-
 vis = VS(geom)
-# vis.Draw()
-
-
-window = 0                                             # glut window number
-width, height = 500, 500
-
 
 
+# window callback functions
 def mydraw():
     vis.Draw()
     glutSwapBuffers()
 
+def mymouse(xold, yold, x, y, mode):
+    MouseMove(vis,xold,yold, x,y, mode)
 
-xold = -1;
-yold = -1;
-mode = 'r'
+# init glut and create window
+glutInit("mainwin")
+win_geom = Window( name=b"ngs", drawfunc=mydraw, mousefunc=mymouse)
 
-def myMotionHandler( x, y ):
-    global xold, yold
-    MouseMove(vis,xold,yold, x,y, mode)  # 'm','z'
-    xold = x
-    yold = y
-    glutPostRedisplay()
-#    mydraw()
+###########################################
+# press ctrl+c to break loop
+try:
+    while(True):
+        for i in range(10000):
+            glutMainLoopEvent()
+        print('press ctrl+c to create second window!')
+except:
+    pass
 
-def myPassiveMotionHandler( x, y ):
-    global xold, yold
-    xold = x
-    yold = y
+###########################################
+# create second window (transformation matrices are shared)
+vismesh = libvisual.meshvis.VS(m1)
+def mydraw2():
+    vismesh.Draw()
+    glutSwapBuffers()
 
-def myMouseHandler( button, state, x, y ):
-    print(button,state,x,y)
-    modes = {0:'r', 1:'m', 2:'z'}
-    global mode
-    if button<3:
-        if state==0:
-            mode = modes[button]
-        else:
-            mode = 'r'
+win_mesh = Window( name=b"ngs2", drawfunc=mydraw2, mousefunc=mymouse)
 
+###########################################
+# press ctrl+c to break loop
+try:
+    while(True):
+        for i in range(10000):
+            glutMainLoopEvent()
+        print('press ctrl+c to hide/destroy first window!')
+except:
+    pass
 
+###########################################
 
-glutInit("mainwin")                                   # initialize glut
-glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
-glutInitWindowSize(width, height)                      # set window size
-glutInitWindowPosition(0, 0)                           # set window position
-window = glutCreateWindow(b"ngs")                      # create window with title
+## BREAKS (on numericus) as soon as mouse touches remaining window ("Error of failed request:  GLXBadContextTag")
+# glutDestroyWindow(win_geom.handle)
 
-glutMotionFunc(myMotionHandler)
-glutMouseFunc(myMouseHandler)
-glutPassiveMotionFunc(myPassiveMotionHandler)
-glutDisplayFunc(mydraw)                                 # set draw function callback
-# glutIdleFunc(mydraw)                                     # draw all the time
-
-
-
-glMatrixMode(GL_PROJECTION);
-glLoadIdentity();
-pnear = 0.1;
-pfar = 10;
-gluPerspective(20.0, 1.0*width / height, pnear, pfar);
-glViewport(0, 0, width, height);
-glMatrixMode(GL_MODELVIEW);
-
-
-
-glutMainLoop()
-
-
-# import threading
-# threading.start_new_thread (glutMainLoop, [])
-
-
-# from threading import Thread
-# thread = Thread(target = glutMainLoop)        
-# thread.start()
-# thread.join()
-
-
-
-# param = meshing.MeshingParameters(maxh=0.2)
-# mesh = GenerateMesh (geom, param)
-# mesh.Save ("test.vol")
+## WORKS
+glutHideWindow(win_geom.handle)
 
+try:
+    while(True):
+        glutMainLoopEvent()
+except:
+    pass

py_tutorials/opengl_thread.py

@@ -0,0 +1,53 @@
+from netgen.csg import *
+import netgen.meshing as meshing
+import libvisual
+
+from OpenGL.GLUT import *
+
+# import Window class from other file
+from opengl_window import Window
+
+sp1 = Sphere (Pnt(0,0,0), 0.2)
+sp2 = Sphere (Pnt(0.5,0,0), 0.2)
+
+all = sp1+sp2
+
+geom = CSGeometry()
+geom.Add (all)
+
+
+param = meshing.MeshingParameters()
+param.maxh = 0.1
+m1 = GenerateMesh (geom, param)
+
+
+vis = VS(geom)
+
+
+# window callback functions
+def mydraw():
+    vis.Draw()
+    glutSwapBuffers()
+
+def mymouse(xold, yold, x, y, mode):
+    MouseMove(vis,xold,yold, x,y, mode)
+
+
+###########################################
+glutInit("mainwin")  
+
+# IMPORTANT: create window in the mainloop - thread!
+
+## not working:
+#win_geom = Window( name=b"ngs", drawfunc=mydraw, mousefunc=mymouse)
+
+def runVisualization():
+## working:
+    win_geom = Window( name=b"ngs", drawfunc=mydraw, mousefunc=mymouse)
+    glutMainLoop()
+
+# create thread
+from threading import Thread
+thread = Thread(target = runVisualization)        
+thread.start()
+thread.join()

py_tutorials/opengl_window.py

@@ -0,0 +1,57 @@
+from OpenGL.GL import *
+from OpenGL.GLU import *
+from OpenGL.GLUT import *
+
+class Window():
+    xold = -1;
+    yold = -1;
+    mode = 'r'
+    modes = {0:'r', 1:'m', 2:'z'}
+    drawfunc = None
+    mousefunc = None
+
+    def draw(self):
+        glutSetWindow(self.handle)
+        self.drawfunc()
+
+    def __init__( self, name=b"Window", width=500, height=500, drawfunc=None, mousefunc=None ):
+        glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE,GLUT_ACTION_GLUTMAINLOOP_RETURNS) 
+        glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
+        glutInitWindowSize(width, height)                      # set window size
+        glutInitWindowPosition(0, 0)                           # set window position
+        self.handle = glutCreateWindow(b"ngs")                      # create window with title
+        glutMotionFunc(self.motionHandler)
+        glutMouseFunc(self.mouseHandler)
+        glutPassiveMotionFunc(self.passiveMotionHandler)
+        glMatrixMode(GL_PROJECTION);
+        glLoadIdentity();
+        pnear = 0.1;
+        pfar = 10;
+        gluPerspective(20.0, 1.0*width / height, pnear, pfar);
+        glViewport(0, 0, width, height);
+        glMatrixMode(GL_MODELVIEW);
+        self.drawfunc = drawfunc
+        self.mousefunc = mousefunc
+        if drawfunc:
+            glutDisplayFunc(self.draw)                               # set draw function callback
+
+    def motionHandler(self, x, y ):
+        self.mousefunc(self.xold,self.yold, x,y, self.mode)  # 'm','z'
+        self.xold = x
+        self.yold = y
+        glutPostRedisplay()
+
+    def passiveMotionHandler(self, x, y ):
+        self.xold = x
+        self.yold = y
+
+    def mouseHandler(self, button, state, x, y ):
+        print(button,state,x,y)
+        if button<3:
+            if state==0:
+                self.mode = self.modes[button]
+            else:
+                self.mode = 'r'
+
+
+glutInit("mainwin")                                   # initialize glut