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;+
; NAME:
; COLORBAR
;
; PURPOSE:
;
; The purpose of this routine is to add a color bar to the current
; graphics window.
;
; AUTHOR:
;
; FANNING SOFTWARE CONSULTING
; David Fanning, Ph.D.
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: davidf@dfanning.com
; Coyote's Guide to IDL Programming: http://www.dfanning.com/
;
; CATEGORY:
;
; Graphics, Widgets.
;
; CALLING SEQUENCE:
;
; COLORBAR
;
; INPUTS:
;
; None.
;
; KEYWORD PARAMETERS:
;
; BOTTOM: The lowest color index of the colors to be loaded in
; the bar.
;
; CHARSIZE: The character size of the color bar annotations. Default is 1.0.
;
; COLOR: The color index of the bar outline and characters. Default
; is !P.Color..
;
; DIVISIONS: The number of divisions to divide the bar into. There will
; be (divisions + 1) annotations. The default is 6.
;
; FONT: Sets the font of the annotation. Hershey: -1, Hardware:0, True-Type: 1.
;
; FORMAT: The format of the bar annotations. Default is '(I5)'.
;
; INVERTCOLORS: Setting this keyword inverts the colors in the color bar.
;
; MAXRANGE: The maximum data value for the bar annotation. Default is
; NCOLORS.
;
; MINRANGE: The minimum data value for the bar annotation. Default is 0.
;
; MINOR: The number of minor tick divisions. Default is 2.
;
; NCOLORS: This is the number of colors in the color bar.
;
; POSITION: A four-element array of normalized coordinates in the same
; form as the POSITION keyword on a plot. Default is
; [0.88, 0.10, 0.95, 0.90] for a vertical bar and
; [0.10, 0.88, 0.90, 0.95] for a horizontal bar.
;;
; RANGE: A two-element vector of the form [min, max]. Provides an
; alternative way of setting the MINRANGE and MAXRANGE keywords.
;
; RIGHT: This puts the labels on the right-hand side of a vertical
; color bar. It applies only to vertical color bars.
;
; TICKNAMES: A string array of names or values for the tick marks.
;
; TITLE: This is title for the color bar. The default is to have
; no title.
;
; TOP: This puts the labels on top of the bar rather than under it.
; The keyword only applies if a horizontal color bar is rendered.
;
; VERTICAL: Setting this keyword give a vertical color bar. The default
; is a horizontal color bar.
;
; COMMON BLOCKS:
;
; None.
;
; SIDE EFFECTS:
;
; Color bar is drawn in the current graphics window.
;
; RESTRICTIONS:
;
; The number of colors available on the display device (not the
; PostScript device) is used unless the NCOLORS keyword is used.
;
; EXAMPLE:
;
; To display a horizontal color bar above a contour plot, type:
;
; LOADCT, 5, NCOLORS=100
; CONTOUR, DIST(31,41), POSITION=[0.15, 0.15, 0.95, 0.75], $
; C_COLORS=INDGEN(25)*4, NLEVELS=25
; COLORBAR, NCOLORS=100, POSITION=[0.15, 0.85, 0.95, 0.90]
;
; MODIFICATION HISTORY:
;
; Written by: David W. Fanning, 10 JUNE 96.
; 10/27/96: Added the ability to send output to PostScript. DWF
; 11/4/96: Substantially rewritten to go to screen or PostScript
; file without having to know much about the PostScript device
; or even what the current graphics device is. DWF
; 1/27/97: Added the RIGHT and TOP keywords. Also modified the
; way the TITLE keyword works. DWF
; 7/15/97: Fixed a problem some machines have with plots that have
; no valid data range in them. DWF
; 12/5/98: Fixed a problem in how the colorbar image is created that
; seemed to tickle a bug in some versions of IDL. DWF.
; 1/12/99: Fixed a problem caused by RSI fixing a bug in IDL 5.2. Sigh... DWF.
; 3/30/99: Modified a few of the defaults. DWF.
; 3/30/99: Used NORMAL rather than DEVICE coords for positioning bar. DWF.
; 3/30/99: Added the RANGE keyword. DWF.
; 3/30/99: Added FONT keyword. DWF
; 5/6/99: Many modifications to defaults. DWF.
; 5/6/99: Removed PSCOLOR keyword. DWF.
; 5/6/99: Improved error handling on position coordinates. DWF.
; 5/6/99. Added MINOR keyword. DWF.
; 5/6/99: Set Device, Decomposed=0 if necessary. DWF.
; 2/9/99: Fixed a problem caused by setting BOTTOM keyword, but not NCOLORS. DWF.
; 8/17/99. Fixed a problem with ambiguous MIN and MINOR keywords. DWF
; 8/25/99. I think I *finally* got the BOTTOM/NCOLORS thing sorted out. :-( DWF.
; 10/10/99. Modified the program so that current plot and map coordinates are
; saved and restored after the colorbar is drawn. DWF.
; 3/18/00. Moved a block of code to prevent a problem with color decomposition. DWF.
; 4/28/00. Made !P.Font default value for FONT keyword. DWF.
; 9/26/00. Made the code more general for scalable pixel devices. DWF.
; 1/16/01. Added INVERTCOLORS keyword. DWF.
; 5/11/04. Added TICKNAME keyword. DWF.
;-
;
;###########################################################################
;
; LICENSE
;
; This software is OSI Certified Open Source Software.
; OSI Certified is a certification mark of the Open Source Initiative.
;
; Copyright © 2000-2004 Fanning Software Consulting.
;
; This software is provided "as-is", without any express or
; implied warranty. In no event will the authors be held liable
; for any damages arising from the use of this software.
;
; Permission is granted to anyone to use this software for any
; purpose, including commercial applications, and to alter it and
; redistribute it freely, subject to the following restrictions:
;
; 1. The origin of this software must not be misrepresented; you must
; not claim you wrote the original software. If you use this software
; in a product, an acknowledgment in the product documentation
; would be appreciated, but is not required.
;
; 2. Altered source versions must be plainly marked as such, and must
; not be misrepresented as being the original software.
;
; 3. This notice may not be removed or altered from any source distribution.
;
; For more information on Open Source Software, visit the Open Source
; web site: http://www.opensource.org.
;
;###########################################################################
PRO colorbar, BOTTOM=bottom, CHARSIZE=charsize, COLOR=color, DIVISIONS=divisions, $
FORMAT=format, POSITION=position, MAXRANGE=maxrange, MINRANGE=minrange, NCOLORS=ncolors, $
TITLE=title, VERTICAL=vertical, TOP=top, RIGHT=right, MINOR=minor, $
RANGE=range, FONT=font, TICKLEN=ticklen, _EXTRA=extra, INVERTCOLORS=invertcolors, $
TICKNAMES=ticknames, bw_to_color = bw_to_color_keywords
; Return to caller on error.
On_Error, 2
; Save the current plot state.
bang_p = !P
bang_x = !X
bang_Y = !Y
bang_Z = !Z
bang_Map = !Map
; Are scalable pixels available on the device?
IF (!D.Flags AND 1) NE 0 THEN scalablePixels = 1 ELSE scalablePixels = 0
; Which release of IDL is this?
thisRelease = Float(!Version.Release)
; Check and define keywords.
IF N_ELEMENTS(ncolors) EQ 0 THEN BEGIN
; Most display devices to not use the 256 colors available to
; the PostScript device. This presents a problem when writing
; general-purpose programs that can be output to the display or
; to the PostScript device. This problem is especially bothersome
; if you don't specify the number of colors you are using in the
; program. One way to work around this problem is to make the
; default number of colors the same for the display device and for
; the PostScript device. Then, the colors you see in PostScript are
; identical to the colors you see on your display. Here is one way to
; do it.
IF scalablePixels THEN BEGIN
oldDevice = !D.NAME
; What kind of computer are we using? SET_PLOT to appropriate
; display device.
thisOS = !VERSION.OS_FAMILY
thisOS = STRMID(thisOS, 0, 3)
thisOS = STRUPCASE(thisOS)
CASE thisOS of
'MAC': SET_PLOT, thisOS
'WIN': SET_PLOT, thisOS
ELSE: SET_PLOT, 'X'
ENDCASE
; Here is how many colors we should use.
ncolors = !D.TABLE_SIZE
SET_PLOT, oldDevice
ENDIF ELSE ncolors = !D.TABLE_SIZE
ENDIF
IF N_ELEMENTS(bottom) EQ 0 THEN bottom = 0B
IF N_ELEMENTS(charsize) EQ 0 THEN charsize = 1.0
IF N_ELEMENTS(format) EQ 0 THEN format = '(I5)'
IF N_ELEMENTS(color) EQ 0 THEN color = !P.Color
IF N_ELEMENTS(minrange) EQ 0 THEN minrange = 0
IF N_ELEMENTS(maxrange) EQ 0 THEN maxrange = ncolors
IF N_ELEMENTS(ticklen) EQ 0 THEN ticklen = 0.2
IF N_ELEMENTS(minor) EQ 0 THEN minor = 2
IF N_ELEMENTS(range) NE 0 THEN BEGIN
minrange = range[0]
maxrange = range[1]
ENDIF
IF N_ELEMENTS(divisions) EQ 0 THEN divisions = 6
IF N_ELEMENTS(font) EQ 0 THEN font = !P.Font
IF N_ELEMENTS(title) EQ 0 THEN title = ''
; You can't have a format set *and* use ticknames.
IF N_ELEMENTS(ticknames) NE 0 THEN format = ""
IF KEYWORD_SET(vertical) THEN BEGIN
bar = REPLICATE(1B,20) # BINDGEN(ncolors)
IF Keyword_Set(invertcolors) THEN bar = Reverse(bar, 2)
IF N_ELEMENTS(position) EQ 0 THEN BEGIN
position = [0.88, 0.1, 0.95, 0.9]
ENDIF ELSE BEGIN
IF position[2]-position[0] GT position[3]-position[1] THEN BEGIN
position = [position[1], position[0], position[3], position[2]]
ENDIF
IF position[0] GE position[2] THEN Message, "Position coordinates can't be reconciled."
IF position[1] GE position[3] THEN Message, "Position coordinates can't be reconciled."
ENDELSE
ENDIF ELSE BEGIN
bar = BINDGEN(ncolors) # REPLICATE(1B, 20)
IF Keyword_Set(invertcolors) THEN bar = Reverse(bar, 1)
IF N_ELEMENTS(position) EQ 0 THEN BEGIN
position = [0.1, 0.88, 0.9, 0.95]
ENDIF ELSE BEGIN
IF position[3]-position[1] GT position[2]-position[0] THEN BEGIN
position = [position[1], position[0], position[3], position[2]]
ENDIF
IF position[0] GE position[2] THEN Message, "Position coordinates can't be reconciled."
IF position[1] GE position[3] THEN Message, "Position coordinates can't be reconciled."
ENDELSE
ENDELSE
; Scale the color bar.
bar = BYTSCL(bar, TOP=(ncolors-1 < (255-bottom))) + bottom
; Get starting locations in NORMAL coordinates.
xstart = position(0)
ystart = position(1)
; Get the size of the bar in NORMAL coordinates.
xsize = (position(2) - position(0))
ysize = (position(3) - position(1))
; Display the color bar in the window. Sizing is
; different for PostScript and regular display.
IF scalablePixels THEN BEGIN
if keyword_set(bw_to_color_keywords) then begin
dum = bw_to_color(bar, _extra = bw_to_color_keywords)
TV, dum, xstart, ystart, XSIZE=xsize, YSIZE=ysize, /Normal, true = 3
endif else begin
TV, bar, xstart, ystart, XSIZE=xsize, YSIZE=ysize, /Normal
endelse
ENDIF ELSE BEGIN
bar = CONGRID(bar, CEIL(xsize*!D.X_VSize), CEIL(ysize*!D.Y_VSize), /INTERP)
; Decomposed color off if device supports it.
CASE StrUpCase(!D.NAME) OF
'X': BEGIN
IF thisRelease GE 5.2 THEN Device, Get_Decomposed=thisDecomposed
Device, Decomposed=0
ENDCASE
'WIN': BEGIN
IF thisRelease GE 5.2 THEN Device, Get_Decomposed=thisDecomposed
Device, Decomposed=0
ENDCASE
'MAC': BEGIN
IF thisRelease GE 5.2 THEN Device, Get_Decomposed=thisDecomposed
Device, Decomposed=0
ENDCASE
ELSE:
ENDCASE
if keyword_set(bw_to_color_keywords) then begin
dum = bw_to_color(bar, _extra = bw_to_color_keywords)
TV, dum, xstart, ystart, /Normal, true = 3
endif else begin
TV, bar, xstart, ystart, /Normal
endelse
; Restore Decomposed state if necessary.
CASE StrUpCase(!D.NAME) OF
'X': BEGIN
IF thisRelease GE 5.2 THEN Device, Decomposed=thisDecomposed
ENDCASE
'WIN': BEGIN
IF thisRelease GE 5.2 THEN Device, Decomposed=thisDecomposed
ENDCASE
'MAC': BEGIN
IF thisRelease GE 5.2 THEN Device, Decomposed=thisDecomposed
ENDCASE
ELSE:
ENDCASE
ENDELSE
; Annotate the color bar.
IF KEYWORD_SET(vertical) THEN BEGIN
IF KEYWORD_SET(right) THEN BEGIN
PLOT, [minrange,maxrange], [minrange,maxrange], /NODATA, XTICKS=1, $
YTICKS=divisions, XSTYLE=1, YSTYLE=9, $
POSITION=position, COLOR=color, CHARSIZE=charsize, /NOERASE, $
YTICKFORMAT='(A1)', XTICKFORMAT='(A1)', YTICKLEN=ticklen , $
YRANGE=[minrange, maxrange], FONT=font, _EXTRA=extra, YMINOR=minor
AXIS, YAXIS=1, YRANGE=[minrange, maxrange], YTICKFORMAT=format, YTICKS=divisions, $
YTICKLEN=ticklen, YSTYLE=1, COLOR=color, CHARSIZE=charsize, $
FONT=font, YTITLE=title, _EXTRA=extra, YMINOR=minor, YTICKNAME=ticknames
ENDIF ELSE BEGIN
PLOT, [minrange,maxrange], [minrange,maxrange], /NODATA, XTICKS=1, $
YTICKS=divisions, XSTYLE=1, YSTYLE=9, YMINOR=minor, $
POSITION=position, COLOR=color, CHARSIZE=charsize, /NOERASE, $
YTICKFORMAT=format, XTICKFORMAT='(A1)', YTICKLEN=ticklen , $
YRANGE=[minrange, maxrange], FONT=font, YTITLE=title, _EXTRA=extra, $
YTICKNAME=ticknames
AXIS, YAXIS=1, YRANGE=[minrange, maxrange], YTICKFORMAT='(A1)', YTICKS=divisions, $
YTICKLEN=ticklen, YSTYLE=1, COLOR=color, CHARSIZE=charsize, $
FONT=font, _EXTRA=extra, YMINOR=minor
ENDELSE
ENDIF ELSE BEGIN
IF KEYWORD_SET(top) THEN BEGIN
PLOT, [minrange,maxrange], [minrange,maxrange], /NODATA, XTICKS=divisions, $
YTICKS=1, XSTYLE=9, YSTYLE=1, $
POSITION=position, COLOR=color, CHARSIZE=charsize, /NOERASE, $
YTICKFORMAT='(A1)', XTICKFORMAT='(A1)', XTICKLEN=ticklen, $
XRANGE=[minrange, maxrange], FONT=font, _EXTRA=extra, XMINOR=minor
AXIS, XTICKS=divisions, XSTYLE=1, COLOR=color, CHARSIZE=charsize, $
XTICKFORMAT=format, XTICKLEN=ticklen, XRANGE=[minrange, maxrange], XAXIS=1, $
FONT=font, XTITLE=title, _EXTRA=extra, XCHARSIZE=charsize, XMINOR=minor, $
XTICKNAME=ticknames
ENDIF ELSE BEGIN
PLOT, [minrange,maxrange], [minrange,maxrange], /NODATA, XTICKS=divisions, $
YTICKS=1, XSTYLE=1, YSTYLE=1, TITLE=title, $
POSITION=position, COLOR=color, CHARSIZE=charsize, /NOERASE, $
YTICKFORMAT='(A1)', XTICKFORMAT=format, XTICKLEN=ticklen, $
XRANGE=[minrange, maxrange], FONT=font, XMinor=minor, _EXTRA=extra, $
XTICKNAME=ticknames
ENDELSE
ENDELSE
; Restore the previous plot and map system variables.
!P = bang_p
!X = bang_x
!Y = bang_y
!Z = bang_z
!Map = bang_map
END
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