I'd like to be able to make plsurf3d or plplot3d plots of complex data where
the Z axis is the magnitude and the color is the phase of the complex values.
Currently, these methods only offer a "MAG_COLOR" option. I think this colors
the plots based on the real (i.e. signed) value rather than the absolute value.
That semantical distinction aside, the point is that the 3D plots can only be
colored, if at all, based on the z axis displacement of the surface (or line)
plot rather than some other attribute of the 2D data field being plotted.
I think this would be best implemented by creating enhanced versions of these
functions that accept an additional 2D data field whose values would be used to
determine colors. Here is the current declaration of plfplot3dcl...
void
plfplot3dcl( PLFLT *x, PLFLT *y, PLF2OPS zops, PLPointer zp,
PLINT nx, PLINT ny, PLINT opt,
PLFLT *clevel, PLINT nlevel,
PLINT ixstart, PLINT ixn, PLINT *indexymin, PLINT *indexymax );
The enhanced, arbitrary color version would be this...
void
plfplot3dcl2( PLFLT *x, PLFLT *y, PLF2OPS zops, PLPointer zp,
PLF2OPS cops, PLPointer cp, // <---- NEW PARAMETERS
PLINT nx, PLINT ny, PLINT opt,
PLFLT *clevel, PLINT nlevel,
PLINT ixstart, PLINT ixn, PLINT *indexymin, PLINT *indexymax );
...where the two new parameters, cops and cp, would represent the 2D data field
to be used to determine colors. cops==NULL would be the same as not specifying
MAG_COLOR, and the MAG_COLOR flag of opt would be ignored.
Using this approach to make the 3D plots of complex data described above, I
would pass the pointer to the 2D complex data for both zp and cp. zops would
point to a plf2ops structure whose "get" function returns the magnitude of the
desired point and cops would point to a plf2ops structure whose "get" function
returns the phase of the desired point.
I'd like to get some feedback/encouragement/lack-of-discouragement before I
embark on this change, so if you have any of the above please let me know.
Thanks,
Dave
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