From: Carlos Pita <carlos@li...> - 2005-08-12 13:43:53
>> It works almost ok, but there are some quirks when repainting the
>> window, (i) sometimes
>> the rulers are not erased and (ii) they are not redrawn when the
>> window is fully repainted,
>> for example after being covered/discovered by other window. I want to
>> put the
>> ruler redrawing routine into the paint event handler in order to see
>> if this solves the
>> problem (which is caused by odd sequences of xor or invert -in my
>> case- line plots).
> I suspect that this is exactly what you need to do to solve the
> problem. My approach in wxmpl has been to stop drawing the crosshairs
> when the mouse is outside of the plot panel, which has allowed me to
> sidestep this particular problem.
I have been experimenting a little using Blit() in the PaintDC to save
background to a MemoryDC before drawing them and then restoring this
buffer again via the "inverse" Blit(). It works pretty well, don't have the
odd-xor-sequence problem and the lines' colours are not altered by xoring
with the colours below.
Once I decide how to implement my widget (which include the rulers
and some map-coordination between two function plots) I will send you
my code as an example. Perhaps it could be useful for someone.
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