Re: Object Graphics slow??

[Martin Schultz <martin.schultz(at)dkrz.de>]

David Fanning wrote:
> 
> Mark Hadfield (m.hadfield@niwa.cri.nz) writes:
> 
> > In recent discussion about object graphics vs direct graphics it has been
> > generally accepted that the object graphics system is slower. In an idle
> > moment (ha!) I was inspired to run a couple of quick tests to see just how
> > much slower. Here are the results:
> >
> > * Plot a line graph with 1000000 (that's 1 million) points:
> >
> > Object graphics (create and draw an IDLgrplot object): 1.45 s
> > Direct graphics (call 'plot'): 2.90 s
> >
> > * Draw 100 byte arrays, each [256, 256], in succession as gray-scale images:
> >
> > Object graphics (create, draw and destroy 100 IDLgrImage objects): 2.9 s
> > Direct graphics (call 'tv' 100 times): 6.2 s
> >
> > These examples (and I accept that they're limited) don't bear out the
> > general opinion.
> >
> > Tests done on Windows NT, IDL 5.3, Compaq machine with Pentium II 400 MHz
> > CPU, 256 MB RAM.
> 
> I've been coming to this conclusion over time, too.
> In fact, I'm beginning to think slow object graphics
> programs, like slow IDL programs in general, are due
> more to lousy programming than to lousy tools. :-)
> 
> Cheers,
> 
> David

... all the more important that RSI provides more high-level object
graphics routines (including contours and maps) !!!!

Martin


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