| IDL 5.2.1 -- bug in filled contours? [message #17450] |
Tue, 26 October 1999 00:00  |
Bob Yantosca
Messages: 6
Registered: March 1998
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Junior Member |
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Hi all,
I've noticed a potential bug in IDL 5.2.1 when you try to overplot filled
contours atop a map. Basically, what happens is that you get a
small square of color that covers a tiny square centered on Lat=0,
Lon=0, instead of covering the entire map area.
See below for a test program I've devised to illustrate the error. The
first plot (with regular color contours) comes out fine. When you use the
/FILL keyword then you run into this bug. (I tried /CELL_FILL too, but
that didn't make any difference).
Per Martin Schultz's suggestion, I tried resetting the Y-axis indices so
that the poles were -89.9 and +89.9 (instead of -90 and +90), but on my
system (SGI-IRIX), that didn't help at all.
Any suggestions?
Thanks much,
Bob Yantosca
bmy@io.harvard.edu
------------------------------------------------------------ ----------
pro Test_Contour
loadct, 27 ; EOS-B Colortable
!P.MULTI = [0, 1, 2, 0, 0] ; 2 plots per page
TmpData = Dist(72, 46) ; Test array for plot
XArr = findgen(72)*5.0 - 180.0 ; X-indices
YArr = findgen(46)*4.0 - 90.0 ; Y-indices
C_Levels = findgen(10)*4 ; Contour levels
C_Colors = findgen(10)*10 ; Contour colors
; Call MAP_SET and CONTOUR with unfilled color contours
Map_Set, /Grid, /Continents, Color=2, $
Title='IDL 5.2 Color Contours (OK)'
Contour, TmpData, XArr, YArr, $
Levels=C_Levels, C_Colors=C_Colors, /OverPlot
; Call MAP_SET and CONTOUR with filled contours
Map_Set, /Grid, /Continents, Color=2, /Advance, $
Title='IDL 5.2 Filled Contours (/FILL)...screwed up'
Contour, TmpData, XArr, YArr, $
Levels=C_Levels, C_Colors=C_Colors, /OverPlot, /Fill
end
----
Bob Yantosca | Phone: (617) 495-4517 \ "Ooooh...floor pie!"
Scientific Programmer | FAX: (617) 495-4551 \ -- Homer J. Simpson
Atmospheric Chemistry | Email: bmy@io.harvard.edu +-------------------------
Harvard University | WWW: http://www-as.harvard.edu/people/staff/bmy/
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