Re: calling setPen for each symbol

Paul,

Can you dynamically divide your symbols into subsets by colour, then set 
the pen for each subset?  (That is, use a QwtPlotCurve for each set of 
like-coloured symbols).  This involves no hacking.

David
_______________________________________________________________
David Stranz, Ph.D.	david_stranz <at> MassSpec.com

Sierra Analytics, Inc.
5815 Stoddard Road, Suite 601
Modesto, CA  95356

Tel: (209) 545-8508
http://www.massspec.com
_______________________________________________________________

Paul Harris wrote:
> Hi,
> 
> I'd like to plot a bunch of symbols, but with a spectrum of colours.
> 
> Currently QwtPlotCurve allows you only define 1 pen/brush (ie one 
> colour) to paint all the symbols.
> I was thinking of hacking it a bit to allow me to specify a function 
> that will reset the pen/brush colour for every symbol.
> 
> But I'm worried about QT's performance, I see notes in the code stating 
> that its slow to draw lines with a brush set.  I'm wondering if it is 
> also slow to change pens/brushes a lot too?   I will check it out via a 
> quick hack + benchmark, but I'm hoping someone already knows the answer 
> as it might be different for different QT versions and different platforms.
> 
> thanks,
> Paul
> 
> 
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