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Re: Delayed plotting in object graphics [message #23020 is a reply to message #22884] Thu, 14 December 2000 14:18 Go to previous message
Mark Hadfield is currently offline  Mark Hadfield
Messages: 783
Registered: May 1995
Senior Member
"Mark Hadfield" <m.hadfield@niwa.cri.nz> wrote in message
news:976672336.180471@clam-ext...
> "Ben Tupper" <pemaquidriver@tidewater.net> wrote in message
> news:3A36BBD9.1A4F589C@tidewater.net...
>> Hello,
>>
>> I am converting some 2d direct graphics to object graphics.
>> Past users of the program producing the graphics have wanted
>> to plot the points in 'slow motion'. That was easy to brute
>> force a lag using PLOTS and WAIT in a loop. Is there a way
>> of doing this with object graphics?
>
> Hmmm. Interesting. Some ideas:

One more idea: I have added a CUMULATIVE property to my MGHgrAnimator class.
Setting this property to an integer n greater than 1 causes n-1 frames to be
displayed in addition to the current one. Setting it to a negative value
causes *all* frames up to the current one to be displayed. Thus this allows
interactively controlled, progressive display of a cloud of points. The
value of the CUMULATIVE property can be changed at any time.

See http://katipo.niwa.cri.nz/~hadfield/gust/software/idl/

Performance is limited by the speed with which the scene can be drawn. With
each data point in a separate atom like this, drawing speed becomes very
slow when the number of points displayed at each time exceeds a few hundred.

---
Mark Hadfield
m.hadfield@niwa.cri.nz http://katipo.niwa.cri.nz/~hadfield/
National Institute for Water and Atmospheric Research
PO Box 14-901, Wellington, New Zealand

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