[PyOpenGL-Users] glCanvas and wxPaintDC

[Ian K. <Ian...@rm...>]

Using glcanvas I have implemented a crude map browser.  I am now trying to draw wxpython graphics onto the canvas, lines, rectangles etc - the endstate is to track mouse movements, but just a libe would be good for now.

Do I need to create a transparent bitmap and overlay this on top of the glCanvas ?

Is there an easier way?  Right now I am trying to draw to the wx.PaintDC (see code below) and not having much luck.  When I insert a draw command such as DrawLine the appication spins in an infinite loop.

I am using a glFrustum projection and varying the camera position to zoom and pan - I would track mouse movement with opengl lines but mapping opengl to window coords is difficult (possible ?)

Here is the code that spins me in a loop

def OnPaint(self, event=None):
        
        dc = wx.PaintDC(self) 
        self.DoDrawing(dc) #call to draw some shapes in pixel coord
        self.SetCurrent()    #set this canvas to recieve Opengl calls
        size = self.GetClientSize()   
        #glViewport( 0,0, *size )  #viewport fixed 
        self.DrawGL()   #call to draw opengl model
        #??need to confirm if I double buffer only opengl and/or wxpython??
        print"paint"
        self.SwapBuffers()
    
    def DoDrawing(self, dc = None): #draw wxpython graphics 
        if dc is None:
            dc = wx.Client(self)
        dc.BeginDrawing()
        pen = wx.Pen(wx.WHITE,4,wx.SOLID)
        dc.SetPen(pen)
        dc.DrawRectangle(10,10,300,300)  #does not like this
        print"draw here"
        dc.EndDrawing()

Ian Krepps
Ian...@rm...