--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lightsim/openglsim.py	Wed Jul 03 09:37:57 2002 +0000
@@ -0,0 +1,83 @@
+# see http://www.sgi.com/software/opengl/advanced97/notes/node57.html for accum notes
+
+import sys
+from Image import *
+from OpenGL.GL import *
+from OpenGL.Tk import *
+
+class Surface:
+  def Display(self, event=None):
+
+    glClearColor(0.0, 0.0, 0.0, 0)
+    glClear( GL_COLOR_BUFFER_BIT |GL_ACCUM_BUFFER_BIT)
+
+    l=glGenLists(1)
+    glNewList(l,GL_COMPILE)
+    glEndList()
+
+#    glDrawBuffer(GL_BACK)
+                
+    for x in range(1,2):
+
+      mag = self.scales[x].get()
+      print "pic %i at %f" % (x,mag)
+      glClear(GL_COLOR_BUFFER_BIT)
+      glDrawPixels(self.imageWidth, self.imageHeight, GL_RGB, GL_UNSIGNED_BYTE, self.image[x])
+
+      if x==0:
+        glAccum(GL_LOAD,mag)
+      else:
+        glAccum(GL_ACCUM,mag)
+
+      # glAccum(GL_ADD,self.x)
+      self.x=(self.x+.1)%2.0
+      print "return"
+      glAccum(GL_RETURN,1)
+
+  def SetupWindow(self):
+    self.OglFrame = Frame()
+    self.OglFrame.pack(side = 'top',fill='both',expand=1)
+    self.QuitButton = Button(self.OglFrame, {'text':'Quit'})
+    self.QuitButton.bind('<ButtonRelease-1>', sys.exit)
+    self.QuitButton.pack({'side':'top'})
+  
+  
+  def SetupOpenGL(self):
+    self.ogl = Opengl(master=self.OglFrame, width = 270, height = 270, double = 1, depth = 0)
+    self.ogl.pack(side = 'top', expand = 1, fill = 'both')
+    self.ogl.set_centerpoint(0, 0, 0)
+    self.ogl.redraw = self.Display
+  
+    for x in range(0,2):
+      self.scales[x] = Scale(self.OglFrame,label="s%i"%x,from_=0,to=1,res=.05,orient='horiz',command=self.ogl.tkRedraw)
+      self.scales[x].pack()
+  
+  
+  def __init__(self):
+    self.x=0
+    self.scales=[None,None]
+  
+    self.SetupWindow()
+  
+    self.image=[]
+    for filename in ('pic1.ppm','pic2.ppm'):
+      im = open(filename)
+      self.imageWidth = im.size[0]
+      self.imageHeight = im.size[1]
+      self.image.append(im.tostring("raw", "RGB", 0, -1))
+      print self.imageWidth, self.imageHeight, self.imageWidth * self.imageHeight*4, len(self.image)
+  
+    self.SetupOpenGL()
+  
+    glDisable(GL_CULL_FACE)
+    #         glEnable(GL_DEPTH_TEST)
+    #         glEnable(GL_NORMALIZE)
+    glShadeModel(GL_FLAT)
+  
+    self.ogl.tkRedraw()
+    self.ogl.mainloop()
+
+if __name__ == '__main__':
+  Surface()
+                
+demo = Surface