| Using [XYZ]TICKFORMAT for dynamic formatting [message #66498] |
Tue, 19 May 2009 08:09  |
![Paul Van Delst[1] is currently offline](theme/default/images/xoffline.png.pagespeed.ic.XRkd1fkXye.png "Paul Van Delst[1] is currently offline")
Paul Van Delst[1]
Messages: 1157
Registered: April 2002
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Senior Member |
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Hello,
Given the following xtickformat function,
FUNCTION lowticks, axis, index, value
RETURN, STRING( value, FORMAT = '("!C",f7.3)' )
END
I am doing something like the following to get the x-axis tick labels on every other plot
printed on the next line:
!P.MULTI = [0,n_xplots,1]
!X.OMARGIN = [10,3]
!X.MARGIN = [0,0]
!Y.OMARGIN = [2,0]
!Y.MARGIN = [4,2]
FOR i = 0, n_xplots-1 DO BEGIN
IF ( i EQ 1 OR i EQ 3 ) THEN BEGIN
xtickformat = 'lowticks'
ENDIF ELSE BEGIN
xtickformat = ''
ENDELSE
PLOT, x, y, XTICKFORMAT = xtickformat
...etc...
to prevent the end-of-axis tick labels from adjacent plots overwriting each other.
The problem is that I want the format in the "lowticks" function, the "f7.3", to be the
same as those automagically chosen by IDL in the plots where the xtickformat defaults.
Does anyone know if there is any way to dynamically set the format string itself in this
fashion? I.e. pass in the "f7.3" (or f4.1 or f5.2 etc) ?
cheers,
paulv
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| Re: Using [XYZ]TICKFORMAT for dynamic formatting [message #66546 is a reply to message #66498] |
Thu, 21 May 2009 15:32  |
Mark[1]
Messages: 66
Registered: February 2008
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Member |
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On May 22, 9:40 am, Paul van Delst <paul.vande...@noaa.gov> wrote:
You can pass whatever data you want to your TICKFORMAT function via
the TICKFRMTDATA keyword. Thus MGH_TF_LINEAR (below) can be called as
...TICKFORMAT='mgh_tf_linear', TICKFRMTDATA={format: '(F0.3)', scale:
1000}
and will show tick values x 1000 to 3 decimal places.
;+
; NAME:
; MGH_TF_LINEAR
;
; PURPOSE:
; This function is designed for use with the TICKFORMAT and
; TICKFRMTDATA properties of IDLgrAxis. Given a real value, it
; applies a linear transformation & returns a string representing
; the result.
;
; CALLING SEQUENCE:
; Result = MGH_TF_LINEAR(Direction, Index, Value)
;
; POSITIONAL PARAMETERS:
; Direction
; Axis direction, required by the TICKFORMAT interface but
ignored.
;
; Index
; Axis index, required by the TICKFORMAT interface but ignored.
;
; Value
; The real value to be formatted.
;
; Level
; Level is the index of the axis level for the current tick value
; to be labeled. (Level indices start at 0.) This parameter takes
; its value from the dimension of TICKUNITS.
;
; KEYWORD PARAMETERS:
; DATA
; Specify this keyword to control the linear transformation and
; format. The keyword value should be a structure with one or more
; of the tags "offset", "scale", "format" and "round". The default
; is equivalent to {offset: 0., scale: 1., format: '', round: 0}.
;
; RETURN VALUE:
; The function returns a scalar string representing:
; output = data.offset + data.scale * input
; If data.round is set to a 'true' value then this is rounded. The
; format is controlled by data.format. If this is not supplied a
; default format is generated by MGH_FORMAT_FLOAT.
;
;########################################################### ################
;
; This software is provided subject to the following conditions:
;
; 1. NIWA makes no representations or warranties regarding the
; accuracy of the software, the use to which the software may
; be put or the results to be obtained from the use of the
; software. Accordingly NIWA accepts no liability for any loss
; or damage (whether direct of indirect) incurred by any person
; through the use of or reliance on the software.
;
; 2. NIWA is to be acknowledged as the original author of the
; software where the software is used or presented in any form.
;
;########################################################### ################
;
; MODIFICATION HISTORY:
; Mark Hadfield, 1999-05:
; Written.
; Mark Hadfield, 2001-03:
; Merged changes by George Constantinides to take advantage of
; multi level axis of IDL 5.4
; Mark Hadfield, 2001-05:
; Added rounding via the "round" tag in DATA. I might generalise
; this some day.
; Mark Hadfield, 2003-01:
; Now accepts a "floor" tag in DATA.
;-
function MGH_TF_LINEAR, direction, index, value, level, DATA=data
compile_opt DEFINT32
compile_opt STRICTARR
offset = 0 & scale = 1. & format = '' & round = 0 & floor
= 0
if size(data, /TYPE) eq 8 then begin
if n_elements(data) ne 1 then message, 'The DATA structure
must have one element'
if mgh_struct_has_tag(data, 'offset') then offset =
data.offset
if mgh_struct_has_tag(data, 'scale') then scale = data.scale
if mgh_struct_has_tag(data, 'format') then format =
data.format
if mgh_struct_has_tag(data, 'round') then round = data.round
if mgh_struct_has_tag(data, 'floor') then floor = data.floor
endif
if n_elements(level) gt 0 then format=format[level]
rvalue = offset+scale*value
if keyword_set(round) then rvalue = round(rvalue)
if keyword_set(floor) then rvalue = floor(rvalue)
result = strlen(format) gt 0 $
? string(rvalue, FORMAT=format) $
: mgh_format_float(rvalue)
; Force scalar output
return, result[0]
end
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