| PLOT() function THICK keyword in v8.2 just a guideline? [message #81326] |
Thu, 06 September 2012 15:14  |
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Paul Van Delst[1]
Messages: 1157
Registered: April 2002
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Senior Member |
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Hello,
I just got IDL v8.2 installed,
IDL> print, !version
{ x86 linux unix linux 8.2 Apr 10 2012 32 64}
I have a piece of code like that shown below (it's within a loop over
index "i"). It simply reads some "new" data and some "old" data, then it
plots the two of them together (the "pn" and "po" plots), and then it
plots the difference (the "pd" plot):
; Create window to hold plots
w = WINDOW( $
WINDOW_TITLE = rts_file_list[i], $
DIMENSIONS = [800,900], $
BUFFER = buffer )
; ...Initialise layout index
index = 0
; Loop over data items
FOR j = 0, n_items-1 DO BEGIN
; Extract the current data item from the RTS objects
new_data = new_rts.Get_Data(item_name[j], Profile=1)
old_data = old_rts.Get_Data(item_name[j], Profile=1)
; Plot the two data sets
index++
yrange = [MIN(new_data)<MIN(old_data), $
MAX(new_data)>MAX(old_data)]
pn = PLOT( $
new_data, $
TITLE = item_name[j], $
YRANGE = yrange, $
LAYOUT = [ n_col, n_row, index ], $
COLOR = 'red', $
THICK = 2, $
CURRENT = w )
po = PLOT( $
old_data, $
COLOR = 'green', $
OVERPLOT = w )
; Plot the difference
index++
pd = PLOT( $
new_data-old_data, $
TITLE = item_name[j]+" difference", $
LAYOUT = [ n_col, n_row, index ], $
CURRENT = w )
ENDFOR
Now, *most* of the time this code works fine. However, every now and
again the line that is plotted by the "pn" plot, that is the one that
has the keyword
THICK=2
plots the line with what looks like the equivalent of a thickness of
about 10, and then some subsequent lines with a thickness of zero (i.e.
not there, or hardly visible).
It's as though the first super-thick line uses up all the thick,
starving subsequent lines.
Here's an example of the wrong result, with incorrect line thicknesses:
http://tinyurl.com/bnchou4
And here's an example of the expected result, with correct line
thicknesses throughout:
http://tinyurl.com/d394vsy
I have the red line be twice as thick so I can see it behind the green
one when the data are the same (too many points to use symbols).
Is this a bug in IDL v8.2? Has anyone seen this behaviour before and
(fingers crossed) discovered a solution?
cheers,
paulv
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