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greek.pro
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greek.pro
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;+
; NAME:
; GREEK
;
; PURPOSE:
;
; This function provides a device-independent way to ask for a Greek letter as
; a string that can be included, for example, in a plot title. It uses the Greek
; simplex font (!4) when used with Hershey fonts, and the Symbol font (!9) when
; used with PostScript or True-Type fonts. Selects the type of Greek character to
; return based on value of !P.FONT. Updated now to return the UNICODE values for
; Greek characters for those fonts that support them (Macintosh?).
;
; AUTHOR:
;
; FANNING SOFTWARE CONSULTING
; David Fanning, Ph.D.
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: [email protected]
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
;
; CATEGORY:
;
; Graphics, Utilities
;
; CALLING SEQUENCE:
;
; greekString = Greek(greekLetter)
;
; RETURN VALUE:
;
; greekString A string that represents the Greek letter.
;
; ARGUMENTS:
;
; greekLetter: The name of the Greek letter desired. A string. Default: 'alpha'.
; Valid string names are the 24 characters of the Greek alphabet.
; alpha nu
; beta xi
; gamma omicron
; delta pi
; epsilon rho
; zeta sigma
; eta tau
; theta upsilon
; iota phi
; kappa chi
; lambda psi
; mu omega
;
; Note that if the first letter of the name is capitalized, this is
; the equivalent of setting the CAPITAL keyword.
;
; KEYWORDRS:
;
; CAPTIAL: If this keyword is set, the captial Greek letter is returned rather
; than the lowercase Greek letter. An alternative way of capitalizing
; the letter is to make the first letter of the name an uppercase letter.
;
; EXAMPLE: If this keyword is set, the names of the Greek characters and their
; symbols are written out in the current graphics window.
;
; PS: Normally, the PostScript version of the greek letter is returned if
; the current device is PostScript and !P.Font is 0 or 1. But, the
; PostScript version of the greek letter can be obtained at any time
; and in any device, by setting this keyword.
;
; UNICODE: If this keyword is set, the function returns the Unicode for the Greek
; letter.
;
; EXAMPLE:
;
; Lowercase PSI:
;
; IDL> Plot, findgen(11), XTitle='This title contains ' + $
; Greek('psi') + ' as a Greek letter'
;
; Uppercase PSI:
;
; IDL> Plot, findgen(11), XTitle='This title contains ' + $
; Greek('Psi') + ' as a Greek letter'
; NOTES:
;
; See the following article for additional information:
;
; http://www.idlcoyote.com/ps_tips/greeksym.html
;
; RESTRICTIONS:
;
; For this program to work correctly on your graphics display, you should be using
; Hershey fonts (!P.Font=-1). It will work correctly in PostScript with either
; hardware fonts (!P.Font=0) or True-Type fonts (!P.Font=1).
;
; MODIFICATION HISTORY:
;
; Written by: David W. Fanning, 9 January 2010.
; An alternative way to get an uppercase letter is to make the first letter of
; the Greek name uppercase. (Maarten Sneep's suggestion!) 11 Jan 2010. DWF
; Had the wrong value for the PostScript version of Phi. 26 January 2010. DWF
; Added UNICODE keyword and values for Greek characters. 11 June 2010. DWF.
; Changed the branching from !D.NAME EQ 'PS' to !P.FONT NE -1. (This is actually
; what the documentation says, and what I intended.) 13 Dec 2010. DWF.
; I don't think the last change did quite want I wanted. More tweaking to make
; this more responsive to being in a PostScript file. 31 July 2011. DWF.
; Added PS keyword so the return value is the PostScript file. This is for
; convenience only, as the return value will be the PostScript value if
; the current graphics device is PS and FONT is not equal to -1. 30 Aug 2011. DWF.
;-
;******************************************************************************************;
; Copyright (c) 2010, by Fanning Software Consulting, Inc. ;
; All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
Forward_Function Greek
PRO Greek_Example, UNICODE=unicode, PS=ps
Compile_Opt hidden
; The 24 Greek letters.
letter = [ 'alpha', 'beta', 'gamma', 'delta', 'epsilon', 'zeta', $
'eta', 'theta', 'iota', 'kappa', 'lambda', 'mu', $
'nu', 'xi', 'omicron', 'pi', 'rho', 'sigma', 'tau', $
'upsilon', 'phi', 'chi', 'psi', 'omega' ]
; Output positions.
x = [0.25, 0.6]
y = Reverse((Indgen(12) + 1) * (1.0 / 13))
; Need PostScript output?
IF Keyword_Set(ps) || (!D.Name EQ 'PS') THEN PS_Start
; Create a window.
cgDisplay, 600, 500
; Output the letters.
FOR j=0,11 DO BEGIN
cgText, x[0], y[j], letter[j] + ': ' + $
Greek(letter[j], UNICODE=unicode) + Greek(letter[j], /CAPITAL, UNICODE=unicode), $
/NORMAL, CHARSIZE=1.5
cgText, x[1], y[j], letter[j+12] + ': ' + $
Greek(letter[j+12], UNICODE=unicode) + Greek(letter[j+12], /CAPITAL, UNICODE=unicode), $
/NORMAL, CHARSIZE=1.5
ENDFOR
; Clean up PostScript, if needed.
IF Keyword_Set(ps) || (!D.Name EQ 'PS') THEN PS_End
; Restore the users window.
IF N_Elements(thisWindow) NE 0 THEN BEGIN
IF thisWindow GE 0 THEN WSet, thisWindow
ENDIF
END ; --------------------------------------------------------------------------------------
FUNCTION Greek, letter, CAPITAL=capital, EXAMPLE=example, PS=PS, UNICODE=unicode
Compile_Opt idl2
; Return to caller on error.
ON_Error, 2
; Do you wish to see an example?
IF Keyword_Set(example) THEN BEGIN
Greek_Example, UNICODE=unicode, PS=ps
RETURN, ""
ENDIF
; A symbol name is required.
IF N_Elements(letter) EQ 0 THEN BEGIN
Print, 'Syntax: Greek("theLetter")
RETURN, ""
ENDIF
; Return quietly if the Greek letter is a null string.
IF letter EQ "" THEN RETURN, ""
; Set up PostScript device for working with Greek letters.
IF !D.Name EQ 'PS' THEN Device, ISOLATIN1=1
; Check keywords.
IF N_Elements(letter) EQ 0 THEN letter = 'alpha'
capital = Keyword_Set(capital)
; If the first letter of the "letter" variable is uppercase
; the user wants an uppercase Greek letter.
firstLetter = StrMid(letter, 0, 1)
IF firstLetter EQ StrUpCase(firstLetter) THEN capital = 1
IF Keyword_Set(unicode) THEN BEGIN
CASE StrLowCase(letter) OF
'alpha': greekLetter = (capital) ? '!Z(0391)' : '!Z(03B1)'
'beta': greekLetter = (capital) ? '!Z(0392)' : '!Z(03B2)'
'gamma': greekLetter = (capital) ? '!Z(0393)' : '!Z(03B3)'
'delta': greekLetter = (capital) ? '!Z(0394)' : '!Z(03B4)'
'epsilon': greekLetter = (capital) ? '!Z(0395)' : '!Z(03B5)'
'zeta': greekLetter = (capital) ? '!Z(0396)' : '!Z(03B6)'
'eta': greekLetter = (capital) ? '!Z(0397)' : '!Z(03B7)'
'theta': greekLetter = (capital) ? '!Z(0398)' : '!Z(03B8)'
'iota': greekLetter = (capital) ? '!Z(0399)' : '!Z(03B9)'
'kappa': greekLetter = (capital) ? '!Z(039A)' : '!Z(03BA)'
'lambda': greekLetter = (capital) ? '!Z(039B)' : '!Z(03BB)'
'mu': greekLetter = (capital) ? '!Z(039C)' : '!Z(03BC)'
'nu': greekLetter = (capital) ? '!Z(039D)' : '!Z(03BD)'
'xi': greekLetter = (capital) ? '!Z(039E)' : '!Z(03BE)'
'omicron': greekLetter = (capital) ? '!Z(039F)' : '!Z(03BF)'
'pi': greekLetter = (capital) ? '!Z(03A0)' : '!Z(03C0)'
'rho': greekLetter = (capital) ? '!Z(03A1)' : '!Z(03C1)'
'sigma': greekLetter = (capital) ? '!Z(03A3)' : '!Z(03C3)'
'tau': greekLetter = (capital) ? '!Z(03A4)' : '!Z(03C4)'
'upsilon': greekLetter = (capital) ? '!Z(03A5)' : '!Z(03C5)'
'phi': greekLetter = (capital) ? '!Z(03A6)' : '!Z(03C6)'
'chi': greekLetter = (capital) ? '!Z(03A7)' : '!Z(03C7)'
'psi': greekLetter = (capital) ? '!Z(03A8)' : '!Z(03C8)'
'omega': greekLetter = (capital) ? '!Z(03A9)' : '!Z(03C9)'
ELSE: Message, 'The greek letter ' + letter + ' is unrecognized.'
ENDCASE
; Return the UNICODE greek letter.
RETURN, greekLetter
ENDIF
IF ((!D.Name EQ 'PS') && (!P.FONT NE -1)) || Keyword_Set(PS) THEN BEGIN
; Make sure ISOLATIN1 encoding is turned on.
IF (!D.Name EQ 'PS') THEN DEVICE, /ISOLATIN1
CASE StrLowCase(letter) OF
'alpha': greekLetter = (capital) ? '!9' + String("101B) + '!X' : '!9' + String("141B) + '!X'
'beta': greekLetter = (capital) ? '!9' + String("102B) + '!X' : '!9' + String("142B) + '!X'
'gamma': greekLetter = (capital) ? '!9' + String("107B) + '!X' : '!9' + String("147B) + '!X'
'delta': greekLetter = (capital) ? '!9' + String("104B) + '!X' : '!9' + String("144B) + '!X'
'epsilon': greekLetter = (capital) ? '!9' + String("105B) + '!X' : '!9' + String("145B) + '!X'
'zeta': greekLetter = (capital) ? '!9' + String("132B) + '!X' : '!9' + String("172B) + '!X'
'eta': greekLetter = (capital) ? '!9' + String("110B) + '!X' : '!9' + String("150B) + '!X'
'theta': greekLetter = (capital) ? '!9' + String("121B) + '!X' : '!9' + String("161B) + '!X'
'iota': greekLetter = (capital) ? '!9' + String("111B) + '!X' : '!9' + String("151B) + '!X'
'kappa': greekLetter = (capital) ? '!9' + String("113B) + '!X' : '!9' + String("153B) + '!X'
'lambda': greekLetter = (capital) ? '!9' + String("114B) + '!X' : '!9' + String("154B) + '!X'
'mu': greekLetter = (capital) ? '!9' + String("115B) + '!X' : '!9' + String("155B) + '!X'
'nu': greekLetter = (capital) ? '!9' + String("116B) + '!X' : '!9' + String("156B) + '!X'
'xi': greekLetter = (capital) ? '!9' + String("130B) + '!X' : '!9' + String("170B) + '!X'
'omicron': greekLetter = (capital) ? '!9' + String("117B) + '!X' : '!9' + String("157B) + '!X'
'pi': greekLetter = (capital) ? '!9' + String("120B) + '!X' : '!9' + String("160B) + '!X'
'rho': greekLetter = (capital) ? '!9' + String("122B) + '!X' : '!9' + String("162B) + '!X'
'sigma': greekLetter = (capital) ? '!9' + String("123B) + '!X' : '!9' + String("163B) + '!X'
'tau': greekLetter = (capital) ? '!9' + String("124B) + '!X' : '!9' + String("164B) + '!X'
'upsilon': greekLetter = (capital) ? '!9' + String("125B) + '!X' : '!9' + String("165B) + '!X'
'phi': greekLetter = (capital) ? '!9' + String("106B) + '!X' : '!9' + String("152B) + '!X'
'chi': greekLetter = (capital) ? '!9' + String("103B) + '!X' : '!9' + String("143B) + '!X'
'psi': greekLetter = (capital) ? '!9' + String("131B) + '!X' : '!9' + String("171B) + '!X'
'omega': greekLetter = (capital) ? '!9' + String("127B) + '!X' : '!9' + String("167B) + '!X'
ELSE: Message, 'The greek letter ' + letter + ' is unrecognized.'
ENDCASE
ENDIF ELSE BEGIN
CASE StrLowCase(letter) OF
'alpha': greekLetter = (capital) ? '!4' + String("101B) + '!X' : '!4' + String("141B) + '!X'
'beta': greekLetter = (capital) ? '!4' + String("102B) + '!X' : '!4' + String("142B) + '!X'
'gamma': greekLetter = (capital) ? '!4' + String("103B) + '!X' : '!4' + String("143B) + '!X'
'delta': greekLetter = (capital) ? '!4' + String("104B) + '!X' : '!4' + String("144B) + '!X'
'epsilon': greekLetter = (capital) ? '!4' + String("105B) + '!X' : '!4' + String("145B) + '!X'
'zeta': greekLetter = (capital) ? '!4' + String("106B) + '!X' : '!4' + String("146B) + '!X'
'eta': greekLetter = (capital) ? '!4' + String("107B) + '!X' : '!4' + String("147B) + '!X'
'theta': greekLetter = (capital) ? '!4' + String("110B) + '!X' : '!4' + String("150B) + '!X'
'iota': greekLetter = (capital) ? '!4' + String("111B) + '!X' : '!4' + String("151B) + '!X'
'kappa': greekLetter = (capital) ? '!4' + String("112B) + '!X' : '!4' + String("152B) + '!X'
'lambda': greekLetter = (capital) ? '!4' + String("113B) + '!X' : '!4' + String("153B) + '!X'
'mu': greekLetter = (capital) ? '!4' + String("114B) + '!X' : '!4' + String("154B) + '!X'
'nu': greekLetter = (capital) ? '!4' + String("115B) + '!X' : '!4' + String("155B) + '!X'
'xi': greekLetter = (capital) ? '!4' + String("116B) + '!X' : '!4' + String("156B) + '!X'
'omicron': greekLetter = (capital) ? '!4' + String("117B) + '!X' : '!4' + String("157B) + '!X'
'pi': greekLetter = (capital) ? '!4' + String("120B) + '!X' : '!4' + String("160B) + '!X'
'rho': greekLetter = (capital) ? '!4' + String("121B) + '!X' : '!4' + String("161B) + '!X'
'sigma': greekLetter = (capital) ? '!4' + String("122B) + '!X' : '!4' + String("162B) + '!X'
'tau': greekLetter = (capital) ? '!4' + String("123B) + '!X' : '!4' + String("163B) + '!X'
'upsilon': greekLetter = (capital) ? '!4' + String("124B) + '!X' : '!4' + String("164B) + '!X'
'phi': greekLetter = (capital) ? '!4' + String("125B) + '!X' : '!4' + String("165B) + '!X'
'chi': greekLetter = (capital) ? '!4' + String("126B) + '!X' : '!4' + String("166B) + '!X'
'psi': greekLetter = (capital) ? '!4' + String("127B) + '!X' : '!4' + String("167B) + '!X'
'omega': greekLetter = (capital) ? '!4' + String("130B) + '!X' : '!4' + String("170B) + '!X'
ELSE: Message, 'The greek letter ' + letter + ' is unrecognized.'
ENDCASE
ENDELSE
RETURN, greekLetter
END