pythoncard-users

[Pythoncard-users] tips on reducing flicker?

[Alec B. <wry...@gm...>]

I have a PythonCard app that creates collages from a directory of pictures.
It makes a show of the process, displaying each picture as its added, about
two per second, full screen.

My problem is that every time a new picture is added, the whole screen
flickers. This isn't really that surprising consdiering the way I'm doing
it: the new image gets pasted onto a fresh canvas and then the old image
(the previous frame) gets swapped out for the new image (the current frame).
When this image swap happens the screen flickers a little bit, but since it
happens twice per second its very distracting.

Can anyone think of a way to reduce this flicker?

In wx I could set something like
self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM), but not in PythonCard as far as
I can tell?

Or some other way to do this?

Thanks for any tips.

Re: [Pythoncard-users] tips on reducing flicker?

[Phil E. <ph...@li...>]

Alec Bennett wrote:
> 
> In wx I could set something like 
> self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM), but not in PythonCard as 
> far as I can tell?
> 

Hi Alec:

You should still be able to do all the regular 'raw' wxPython stuff in 
your PythonCard application, since most of the PythonCard objects are 
subclassed from their wxPython equivalents.

As an example, I have the following code in a little applet I wrote to 
simplify the management of profiles for the various wireless networks I 
use regularly:

     def on_scanBtn_mouseClick(self, event):
         win = MyMiniFrame(self, "Wireless Network Scan",
                           style=wx.DEFAULT_FRAME_STYLE | 					 
wx.TINY_CAPTION_HORIZ)
         win.SetSize((200, 60))
         win.CenterOnParent(wx.BOTH)
         win.Show(True)
         win.Update()
         win.Refresh()
         wx.Yield()

This is just some raw wxPython code called from in the middle of the 
PythonCard app that surrouonds it.

-- 

Regards

Phil Edwards   |  PGP/GnuPG Key Id
Brighton, UK   |  0x68393AEE