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; docformat = 'rst'
;
; NAME:
; cgResizeRaster
;
; PURPOSE:
; The purpose of this program is to resize a raster file according to
; instructions from the user.
;
;******************************************************************************************;
; ;
; 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 program is to resize a raster file according to
; instructions from the user. It was designed specifically to resize the
; extremely large raster files created by IDL's function graphics commands
; from within an IDL program. It requires ImageMagick be installed and able
; to be called from a SPAWN command from within IDL.
;
; :Categories:
; Graphics
;
; :Params:
; rasterfile: in, required, type=string
; Set this parameter to the name of the raster file to be resized. The resized
; file will have this same name unless the `KEEP_ORIGINAL` keyword is set, in
; which case an "_rs" will be appended to the base name given by this parameter.
; percentage: in, optional, type=float
; A resize percentage. A value of 50, for example, will make the output file
; half its original size. A file may be made bigger by specifying a percentage
; greater than 100 (e.g. 150). The default is to calculate a precentage that makes
; the longest dimension of the output file approximately 600 pixels.
;
; :Keywords:
; keep_original: in, optional, type=boolean
; Set this keyword to keep the original file. Otherwise, the file is overwritten with
; the resized file. If this keyword is set, the output file will use the same name as
; the input file, except an "_rs" will be appended to the base name of the input file.
; height: in, optional, type=integer
; Set this keyword to set the height of the resulting raster file in pixel units. The width of the
; raster will be such as to preserve the aspect ratio of the starting image. This keyword
; cannot be used if the `WIDTH` keyword is used at the same time.
; silent: in, optional, type=boolean, default=0
; Set this keyword to suppress printed output from the program.
; width: in, optional, type=integer
; Set this keyword to set the resulting width of the raster file. The height of the
; raster will be such as to preserve the aspect ratio of the starting image. This keyword
; cannot be used if the `HEIGHT` keyword is used at the same time.
;
; :Examples:
; Here is how to use this program::
; IDL> cgResizeRaster, 'picture.png', /Keep_Original, Width=500
;
; :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.
;-
PRO cgResizeRaster, rasterfile, percentage, $
KEEP_ORIGINAL=keep_original, $
HEIGHT=height, $
SILENT=silent, $
WIDTH=width
Compile_Opt idl2
; Standard error handling.
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
RETURN
ENDIF
IF (N_Elements(rasterfile) EQ 0) || (Size(rasterfile, /TNAME) NE 'STRING') THEN BEGIN
rasterfile = cgPickfile(Title='Select a raster file for resizing...')
IF rasterfile EQ "" THEN RETURN
ENDIF
; If you don't have ImageMagick installed, there is no point in going on.
IF ~cgHasImageMagick() THEN Message, 'ImageMagick cannot be found on this machine and is required.'
; Is this a valid type of file?
validTypes = ['gif', 'jpeg', 'jpg', 'png', 'tiff', 'tif', 'bmp', 'ppm', 'jpf', 'jpx']
rootname = cgRootname(rasterfile, EXTENSION=extension, DIRECTORY=directory)
IF Keyword_Set(keep_original) THEN BEGIN
outputFileName = Filepath(ROOT_DIR=directory, rootname + '_rs.' + extension)
ENDIF ELSE BEGIN
outputFileName = rasterfile
ENDELSE
index = Where(validTypes EQ StrLowCase(extension), count)
IF count EQ 0 THEN Message, 'Cannot resize an image file with this extension: ' + extension + '.'
; The default percentage is choosen to create an image whose largest dimension is approximately
; 600 pixels. In any case, the percentage must be greater than 0
IF N_Elements(percentage) EQ 0 THEN BEGIN
void = Query_Image(rasterfile, DIMENSIONS=dims)
maxsize = Max(dims)
percentage = 100.0 * (600.0 / maxsize)
ENDIF ELSE percentage = 0 > percentage
; You can resize by HEIGHT or by WIDTH, but not by both.
IF (N_Elements(width) NE 0) && (N_Elements(height) NE 0) THEN BEGIN
Message, 'HEIGHT and WIDTH keywords cannot be used together. Using WIDTH.', /Informational
Undefine, height
ENDIF
; If you use either of the HEIGHT or WIDTH keywords, the resize percentage is ignored.
IF (N_Elements(width) NE 0) || (N_Elements(height) NE 0) THEN percentage = 0
; Need to resize to a specific width or height?
IF (N_Elements(width) NE 0) || (N_Elements(height) NE 0) THEN BEGIN
void = Query_Image(rasterfile, DIMENSIONS=dims)
IF dims[0] GT dims[1] THEN landscape = 1 ELSE landscape = 0
CASE 1 OF
(N_Elements(width) NE 0) && (N_Elements(height) EQ 0): BEGIN
resize_cmd = ' -resize ' + StrCompress(Fix(width), /REMOVE_ALL)
END
(N_Elements(width) EQ 0) && (N_Elements(height) NE 0): BEGIN
resize_cmd = ' -resize x' + StrCompress(height, /REMOVE_ALL)
END
ENDCASE
ENDIF
; We will do the normal resize, unless this has already been done. Two checks here.
IF (percentage NE 0) && (N_Elements(resize_cmd) EQ 0) THEN BEGIN
resize_cmd = ' -resize '+ StrCompress(percentage, /REMOVE_ALL) + '%'
ENDIF
; Construct the proper ImageMagick command.
cmd = 'convert ' + rasterfile + resize_cmd + ' ' + outputFileName
; Execute the ImageMagick command.
Spawn, cmd, result, err_result
; Either print the error, or a message locating the file.
IF ~Keyword_Set(silent) THEN BEGIN
IF err_result[0] NE "" THEN BEGIN
FOR k=0,N_Elements(err_result)-1 DO Print, err_result[k]
ENDIF ELSE BEGIN
Print, 'Output file located here: ' + outputFileName
ENDELSE
ENDIF
END
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