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Re: POLYFILL erases my tick values - solution? [message #21864 is a reply to message #21862] Fri, 22 September 2000 00:00 Go to previous messageGo to previous message
Liam E. Gumley is currently offline  Liam E. Gumley
Messages: 378
Registered: January 2000
Senior Member
Andrew <noymer@my-deja.com> wrote in message
news:8qgda2$ml8$1@nnrp1.deja.com...
> I am using POLYFILL to shade various regions of an X-Y plot different
> shades of grey. I use PLOT (with /nodata) to draw the axes, then I
> use PLOTS to draw a bunch of lines, etc. (In this case, I'm making a
> simple diagram, not really plotting data, but the question is pretty
> general.)
>
> I'm making PostScript output so I am limited to solid colors
> as opposed to patterns (is there a good reason for that???), but
> so far that's not my real problem.
>
> The problem is that POLYFILL seems to obliterate everything in
> its path, including axis tick values. For the lines I draw, there is
> an easy solution: I just shade first, then draw. But I am working with
> \DATA coordinates, so I'm quite sure (???) I have to PLOT before I can
> POLYFILL, hence the problem that the tick values are over-shaded.
>
> Even the RSI "Using IDL" manual, 1998 paper version, p. 190,
> shows a (very ugly!) example of shading that erases tick values.
>
> The best solution I have found is to use the AXIS procedure
> after POLYFILL, to re-draw the axis.
>
> IS THIS THE BEST SOLUTION?

Here's another solution:

;- Make sure decomposed color is off, and load grayscale
device, decomposed=0
loadct, 0

;- Set plot position (normal coordinates)
p = [0.1, 0.1, 0.9, 0.9]

;- Fill plot window
polyfill, [p[0], p[2], p[2], p[0], p[0]], [p[1], p[1], p[3], p[3], p[1]], $
/normal, color=(0.5 * !d.table_size)

;- Create plot
plot, indgen(10), /noerase, position=p

Cheers,
Liam.
http://cimss.ssec.wisc.edu/~gumley

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