| Re: plotting data as it arrives using objects [message #44315] |
Mon, 06 June 2005 14:37  |
Rick Towler
Messages: 821
Registered: August 1998
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Senior Member |
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clive_cook wrote:
> I think that the problem with this technique might be that each time a
> new file is written the contour will have to be re-calculated and
> re-drawn which considering the data can be a large 3-d array
> (4000x452x452) could make the program slow. I have yet to test this so
> i am not completely sure.
Well, I don't know exactly what you are doing so what do I know but...
I can't quite make the connection between your 4000x450x450 dataset and
the plots you did in DG. What do you mean by this "contour" you created
with plots? Is it 2d, is it 3d? How do you get from 4000x450x450 to
your plot?
Regardless, with the proper hardware I doubt that OG would be a show
stopper. I have found that for 3d plots using modern graphics hardware
that except for very simple plots OG is always faster so the re-draw
shouldn't be an issue (at least when compared to your DG application).
As for the re-calculation part, what can I say. You are obviously
minimizing the re-calculations in your DG application so why couldn't
you do the same in the OG application?
But then again, I thought I sort of understood what you were plotting
but your response makes me think otherwise. Maybe some more detail
would help.
-Rick
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| Re: plotting data as it arrives using objects [message #44444 is a reply to message #44315] |
Mon, 13 June 2005 10:12  |
clive_cook59
Messages: 6
Registered: January 2005
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Junior Member |
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Ok, i didn't do a good job of explaining myself. I've also done a
little bit of research. Ultimately i'm looking to produce a contour
plot (usually you can use the contour function in direct graphics or
the idlgrcontour object). The idea is to produce this plot as data
arrives, arriving approximately one profile every 2.5 seconds. Its a
slow inefficient way to re-calculate the contour so in direct graphics
i drew one profile at a time onto a plot using the plots command and
scaling the colours to the data values (so a series of these profiles
produces a contour plot however it is drawn on the fly).
So now i am trying to do something similar with object graphics. I
tried doing it by updating my data to the idlgrcontour object using
contour->setproperty,data_values=new_data as new data arrives. The
problem with this is as the new_data array increases in size the time
taken to re-calculate the contour also increases, eventually it becomes
far to slow. I'm looking for a way to do this in a more efficicent way.
I hope this is clearer
many thanks
Clive Cook
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