[wxPython-users] Bitmap in a wxScrolledWindow

[Gavana, Andrea]

Hello NG,

thank you Simon, the EVT_ERASE_BACKGROUND cured almost all the flicker (but not all). I have tried to implement Peter's suggestion in this way:

    def OnPaint(self, event):

        width = self.currentbmp.GetWidth()
        height = self.currentbmp.GetHeight()
        
        size = self.scrolled.GetSize()
        xmin = (size.x - width)/2
        ymin = (size.y - height)/2

        dc = wx.PaintDC(self.scrolled)

        self.PrepareDC(dc)
        dc.Clear()

        memdc = wx.MemoryDC()
        bmp = wx.EmptyBitmap(width, height)
        memdc.SelectObject(bmp)
        memdc.DrawBitmap(self.currentbmp, 0, 0)
        
        dc.Blit(xmin, ymin, width, height, memdc, 0, 0)

        memdc.SelectObject(wx.NullBitmap)        

        event.Skip()


But it seems to me that the reduction of the flicker is almost zero. It flickers as before :-D
Probably it is my poor knowledge of wx.DC things.
Or probably it is that the images are quite big (1.5 MB, 2000 pixels wide), and so I have to live with some of the flicker :-)

Mhm... Will double buffering help here?

Thanks for your comments...

Andrea.

_________________________________________
Andrea Gavana (gavana at kpo.kz)
Reservoir Engineer
KPDL
4, Millbank
SW1P 3JA London
 
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