cgpsdims.pro
5.23 KB
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; docformat = 'rst'
;
; NAME:
; cgPSDims
;
; PURPOSE:
; The purpose of this function is to return the dimensions of the bounding
; box of a PostScript file.
;
;******************************************************************************************;
; ;
; Copyright (c) 2014, 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. ;
;******************************************************************************************;
;
;+
; The purpose of this function is to return the dimensions of the bounding
; box of a PostScript file.
;
; :Categories:
; Utility
;
; :Params:
; filename: in, required, type=string
; The name of a PostScript file from which the bounding box information will be
; obtained.
;
; :Keywords:
; success: out, optional, type=boolean
; This keyword will be set to 1 if the program is successful and to 0 otherwise.
;
; :Examples:
; Here is how to use this program::
; IDL> ps_dims = cgPSDims('myoutput.ps')
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: david@idlcoyote.com
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; :History:
; Change History::
; Written, 15 January 2014 by David W. Fanning.
;
; :Copyright:
; Copyright (c) 2014, Fanning Software Consulting, Inc.
;-
FUNCTION cgPSDims, filename, SUCCESS=success
Compile_Opt idl2
; Error handling.
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
success = 0
IF N_Elements(lun) NE 0 THEN Free_Lun, lun
RETURN, [0,0]
ENDIF
; Must have a filename to proceed.
IF N_Elements(filename) EQ 0 THEN BEGIN
filename = Dialog_Pickfile(FILTER=['*.ps', '*.eps'], TITLE='Select a PostScript file to obtain its dimensions.')
IF filename EQ "" THEN Message, 'A PostScript file name is required to continue.'
ENDIF
; Assume success.
success = 1
; Move along in the file until the end of the comment section.
line = ""
count = 0
target = "void"
buffer = StrArr(100)
OpenR, lun, filename, /GET_LUN
WHILE target NE '%%EndComments' DO BEGIN
ReadF, lun, line
buffer[count] = line
target = StrMid(line, 0, 13)
count = count + 1
IF count MOD 100 EQ 0 THEN buffer = [buffer, StrArr(100)]
ENDWHILE
Free_Lun, lun
; Find the line containing the bounding box in the comment section and
; extract the dimension of the PostScript file.
buffer = buffer[0:count-2]
FOR j=0,N_Elements(buffer)-1 DO BEGIN
test = StrMid(buffer[j], 0, 14)
IF test NE '%%BoundingBox:' THEN Continue
values = IntArr(4)
ReadS, StrMid(buffer[j], 15), values
dims = [values[2]-values[0], values[3]-values[1]]
Break
ENDFOR
RETURN, dims
END