| Re: Object graphic 3d Scatterplot [message #19487 is a reply to message #19485] |
Wed, 22 March 2000 00:00   |
Martin Schultz
Messages: 515
Registered: August 1997
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Senior Member |
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Ben Tupper wrote:
> Hello,
>
> Well, I found that I couldn't manage more than 10-100 points without
> seeing performance drop. For each point, I defined a symbol obect and
> placed them all in an array. A lot depended on whether or not these
> points were draped across a surface with some kind of image texture. A
> lot depends on the platform I suppose. After posting this, I'llprobably
> find out it is the programmer. The data sets I am using are numbering
> 1000s of data points. To be sure, a visualization with 5000-1000
> points can begin to obscure the different class distributions if the are
> more than just a few data classes (colors).
>
> It seems like such a simple thing (and wicked, as we DownEasters say,
> vital to datah vizulizin'). In direct graphics, I use colored (sized,
> etc.) data symbols all of the time to communicate some extra
> dimensionality to the data.
>
> Here's what all I know about the relationship between this attribute
> object (IDLgrSymbol) and its parent (IDLgrPlot, IDLgrPolyLine,...)
>
> So the plot object would have to perform umpteen GetProperty calls to
> umpteen symbol objects. (Which, by the way, the documentation doesn't
> make it very clear that this field can be set to an array of symbol
> objects.)
just an unsolicited question: wouldn't this be a good example for a new
subclass of IDLgrPlot? You could extend the object definition by a new
property (a pointer to an array DataClass for example) modify the
SetProperty and GetProperty methods to allow changing/retrieving the
DataClass values and change the Show (or whatever) method to use the
DataClass values as a color coding for example. In pseudo code this
would be something like:
ClassgrPlot::Overplot,Data
; get all DataClass values and loop using them as colors
uclass = uclass(uniq(*self.DataClass,sort(self.DataClass)))
for i=0L,n_elements(uclass)-1 do begin
; define a suitable color or symbol/property object
color = i
w = where(self.DataClass eq uclass)
inherited->Overplot,self.Data[w],color=color
endfor
end
Please note that this is not a working example and that I have only gone
2 mm into object land so far. I'm just speculating ...
Cheers,
Martin
--
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
[[ Dr. Martin Schultz Max-Planck-Institut fuer Meteorologie [[
[[ Bundesstr. 55, 20146 Hamburg [[
[[ phone: +49 40 41173-308 [[
[[ fax: +49 40 41173-298 [[
[[ martin.schultz@dkrz.de [[
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