Re: AW: AW: [geclipse-dev] Traceview

[Thomas Köckerbauer <tkoeck@xxxxxxxxxx>]

Abstractions are nice but at some point I think it does not make any sense 
anymore, because either you have to throw away half of the functionality or 
its getting way to difficult. I'm sure that it is possible to build something 
like this, but that would also be true for lets say VTK and DirectSound, both 
use input data, can apply operations on the data and can output data. Just my 
2 cents.

Am Mittwoch 18 Juni 2008 15:04:37 schrieb Stuempert, Mathias IWR:
> I just take BIR*T* and VTK as an example because they definitely do not
> have too much in common ... at least at a first glance ...
>
> > BIRT does not have the concept of a visualisation pipeline, you just
>
> pass
>
> > arrays with the data for your axis and specify the chart type. In VTK
>
> you
>
> > specify a data source, data filters, a mapping from the derived data
>
> to
>
> > the
> > geometry do display and then render the result of this pipeline. Those
> > things
> > do not have much in common.
>
> OK
>
> data source + data filters <-> arrays with data
> mapping of data <-> birt axes
> geometry <-> chart type
>
> This mapping may not be perfect, but in fact it is the result of 10 secs
> thinking with my tiny black hole in my head ;-)
>
> Well, in fact ALL visualizations/chartings or whatever do have the same
> basic concepts. You always have some input data (let's call it
> IDataType) that you somehow map (let's call it Mapping) to some kind of
> axes (let's call it IAxisType) - whereas these axes are not limited to
> XYZ but may also be color or elevation or spherical coordinates or
> whatever - and afterwards project (let's call it IProjection) in a 2
> dimensional display. This even applies (at least partly) to AWT, SWT,
> QT, root, OpenGL, VisAD, Direct3D or whatever.
>
> So here is a first model:
> IDataType
>  + DataArray
>  + RealNumber
>  + ...
> IAxisType
>  + DisplayAxis
>  + ColorAxis
>  + ...
> IProjection
>  + Projection2D
>    + ...
>  + Projection3D
>    + ...
> Mapping( IDataType from, IAxisType to );
>
> Of course I know that finding an abstraction here is far beyond the
> scope of this project (Sylva will now be happy to hear that ;-) and as I
> said, I am just dreaming. But honestly, we always try to have a generic
> layer beyond our implementations. Visualization is the only thing that
> is not generalised. And if there is any chance to come up with something
> general, let's go for it. So you did not even have a try up to now, or
> did you. You're just saying it is impossible, shame on you :-P
>
> Mathias
> _______________________________________________
> geclipse-dev mailing list
> geclipse-dev@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/geclipse-dev