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cgcontour.pro
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cgcontour.pro
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; docformat = 'rst'
;
; NAME:
; cgContour
;
; PURPOSE:
; The purpose of cgContour is to create a wrapper for the traditional IDL graphics
; command, Contour. The Contour command has a number of deficiencies that make it
; difficult to use in a modern computing environment. cgContour corrects these
; deficiencies and allows the user to produce traditional contour plots in a device
; and machine independent manner.
;
;******************************************************************************************;
; ;
; 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. ;
;******************************************************************************************;
;
;+
; The purpose of cgContour is to create a wrapper for the traditional IDL graphics
; command, Contour. The Contour command has a number of deficiencies that make it
; difficult to use in a modern computing environment. cgContour corrects these
; deficiencies and allows the user to produce traditional contour plots in a device
; and machine independent manner.
;
; .. image:: cgcontour.png
;
; The program requires the `Coyote Library <http://www.idlcoyote.com/documents/programs.php>`
; to be installed on your machine.
;
; :Categories:
; Graphics
;
; :Params:
; data: in, required, type=any
; A one- or two-dimensional array containing the values that make
; up the contour surface.
; x: in, optional, type=any
; A vector or two-dimensional array specifying the X coordinates for
; the contour surface.
; y: in, optional, type=any
; A vector or two-dimensional array specifying the Y coordinates for
; the contour surface.
;
; :Keywords:
; addcmd: in, optional, type=boolean, default=0
; Set this keyword to add the command to an cgWindow. Setting this keyword
; automatically sets the WINDOW keyword, but the command does not erase the
; graphics window as it would normally.
; aspect: in, optional, type=float, default=none
; Set this keyword to a floating point ratio that represents the aspect ratio
; (ysize/xsize) of the resulting plot. The plot position may change as a result
; of setting this keyword. Note that `Aspect` cannot be used when plotting with
; !P.MULTI.
; axiscolor: in, optional, type=string/integer, default='opposite'
; If this keyword is a string, the name of the axis color.
; Otherwise, the keyword is assumed to be a color index into the current color table.
; axescolor: in, optional, type=string/integer
; Provisions for bad spellers.
; background: in, optional, type=string/integer, default='background'
; If this keyword is a string, the name of the background color.
; Otherwise, the keyword is assumed to be a color index into the current color table.
; c_annotation: in, optional, type=string
; The label to be drawn on each contour. Normally contours are labeled with their
; value. This vector of strings may substitute for those values.
; c_colors: in, optional, type=integer/string vector
; Set to the index values of the contour colors or to named colors. Must contain
; the same number of colors as the number of requested contour levels.
; c_labels: in, optional, type=integer
; A vector that specifies which contour levels to label. If used, the LABEL
; keyword is ignored.
; c_charsize: in, optional, type=float
; The character size of the annotations used on the contour lines themselves.
; By default, 75% of `Charsize`.
; cell_fill: in, optional, type=boolean, default=0
; Set to indicate filled contours should be created using the "cell fill" method.
; This keyword should always be set if displaying filled contours on map projections
; or if missing data is present in the data you are contouring.
; charsize: in, optional, type=float, default=cgDefCharSize()
; The character size for axes annotations. Uses cgDefCharSize to select default
; character size, unless !P.Charsize is set, in which case !P.Charsize is always used.
; color: in, optional, type=string/integer, default='black'
; If this keyword is a string, the name of the data color. By default, same as AXISCOLOR.
; Otherwise, the keyword is assumed to be a color index into the current color table.
; font: in, optional, type=integer, default=!P.Font
; The type of font desired for axis annotation.
; fill: in, optional, type=boolean, default=0
; Set to indicate filled contours should be created.
; isotropic: in, optional, type=boolean, default=0
; Set this keyword to set the `Aspect` keyword to the plot aspect ratio that preserves
; identical scaling for the X and Y axes. This keyword cannot be used with multiple
; contour plots on the page.
; irregular: in, optional, type=boolean
; If this keyword is set, the data, x, and y input parameters are taken to be
; irregularly gridded data, the the data is gridded for use in the contour plot
; using the Triangulate and Trigrid method. The resolution of the gridded output
; is set by the RESOLUTION keyword.
; label: in, optional, type=integer, default=1
; An number that tells how to label contour levels. A 0 means
; no contour levels are labelled. A 1 (the default) means all contour levels are
; labelled. A 2 means label every 2nd contour level is labelled. A 3 means every
; 3rd contour level is labelled, and so on.
; layout: in, optional, type=intarr(3)
; This keyword specifies a grid with a graphics window and determines where the
; graphic should appear. The syntax of LAYOUT is three numbers: [ncolumns, nrows, location].
; The grid is determined by the number of columns (ncolumns) by the number of
; rows (nrows). The location of the graphic is determined by the third number. The
; grid numbering starts in the upper left (1) and goes sequentually by column and then
; by row.
; levels: in, optional, type=any
; A vector of data levels to contour. If used, NLEVELS is ignored. If missing,
; NLEVELS is used to construct N equally-spaced contour levels.
; map_object: in, optional, type=object
; If you are overplotting (OVERPLOT=1) on a map projection set up with Map_Proj_Init
; and using projected meter space, rather than lat/lon space, then you can use this
; keyword to provide a cgMap object that will allow you to convert the `x` and `y`
; grid parameters from longitude and latitude, respectively, to projected meter space
; before the contour is displayed. Note, you MUST pass the `x` and `y` grid parameters
; to cgContour if you are overplotting on a map projection. There is no checking to
; be sure these parameters are in the correct longitude and latitude range, respectively.
; missingvalue: in, optional, type=any
; Use this keyword to identify any missing data in the input data values.
; noclip: in, optional, type=boolean, default=0
; Normally, the plot is clipped to the axes boundaries. Setting this keyword prevents
; such clipping. Normally, this keyword is only used when there is a problem displaying
; contour plots in 3D space.
; nlevels: in, optional, type=integer, default=6
; If the Contour plot LEVELS keyword is not used, this keyword will produce this
; number of equally spaced contour intervals. Unlike the Contour NLEVELS keyword,
; this keyword actually works!
; noerase: in, optional, type=boolean, default=0
; Set this keyword to prevent the window from erasing the contents before displaying
; the contour plot.
; olevels: out, optional
; Set to a named variable to return the actual contour levels used in the program.
; Unfortunately, output variables cannot be returned if the cgContour command is
; being executed in a cgWindow.
; onimage: in, optional, type=boolean, default=0
; If this keyword is set, and an image has been display previously with cgImage,
; then the contour plot will determine the location of the image in the display
; window and overplot itself onto that image.
; outcolor: in, optional, type=string, default='charcoal'
; The color of the contour lines when the `Outline` keyword is used.
; outfilename: in, optional, type=string
; If the `Output` keyword is set, the user will be asked to supply an output
; filename, unless this keyword is set to a non-null string. In that case, the
; value of this keyword will be used as the filename and there will be no dialog
; presented to the user.
; outline: in, optional, type=boolean, default=0
; This keyword applies only if the `Fill` keyword is set. It will draw the
; contour lines on top of the filled contour. It draws the outline in the `OutColor`.
; output: in, optional, type=string, default=""
; Set this keyword to the type of output desired. Possible values are these::
;
; 'PS' - PostScript file
; 'EPS' - Encapsulated PostScript file
; 'PDF' - PDF file
; 'BMP' - BMP raster file
; 'GIF' - GIF raster file
; 'JPEG' - JPEG raster file
; 'PNG' - PNG raster file
; 'TIFF' - TIFF raster file
;
; Or, you can simply set this keyword to the name of the output file, and the type of
; file desired will be determined by the file extension. If you use this option, the
; user will not be prompted to supply the name of the output file.
;
; All raster file output is created through PostScript intermediate files (the
; PostScript files will be deleted), so ImageMagick and Ghostview MUST be installed
; to produce anything other than PostScript output. (See cgPS2PDF and cgPS_Close for
; details.) And also note that you should NOT use this keyword when doing multiple
; plots. The keyword is to be used as a convenient way to get PostScript or raster
; output for a single graphics command. Output parameters can be set with cgWindow_SetDefs.
; overplot: in, optional, type=boolean, default=0
; Set this keyword to overplot the contours onto a previously established
; data coordinate system.
; palette: in, optional, type=byte
; A (256x3) color palette containing the RGB color vectors to use for coloring contours.
; Contour colors will be sampled from the color table palette into the number
; of contour levels required. If the palette is NOT 256 elements in length, then
; it is assumed that the length corresponds to the number of levels to be contoured.
; position: in, optional, type=float
; Set this keyword to a four-element [x0,y0,x1,y1] array giving the contour plot
; position in normalized coordinates.
; resolution: in, optional, type=integer array, default=[41\,41]
; If the IRREGULAR keyword is set, this keyword specifies the X and Y resolution
; in a two element integer array of the final gridded data that is sent to the
; contour plot.
; t3d: in, optional, type=boolean, default=0
; Set this keyword to use the 3D axis rotation matrix in !P.T3D.
; title: in, optional, type=string
; Set this keyword to the title of the plot.
; traditional: in, optional, type=boolean, default=0
; If this keyword is set, the traditional color scheme of a black background for
; graphics windows on the display is used and PostScript files always use a white background.
; window: in, optional, type=boolean, default=0
; Set this keyword to replace all the commands in the current cgWindow or to
; create a new cgWindow, if one doesn't currenly exist, for displaying this command.
; To create a new cgWindow if one currenly exists, use the `cgWindow` command
; xstyle: in, optional, type=integer, default=1
; If unused in the program, set to 1 to force exact axis scaling.
; xthick: in, optional, type=integer, default=1
; The thickness of the X axis annotations.
; xticklen: in, optional, type=float, default=0.025
; The length of the X tick marks. Set to a negative value to create outward
; facing tick marks.
; xticks: in, optional, type=integer
; The number of tick intervals on the X axis.
; xtickv: in, optional, type=string
; A vector of tick values to use with the tick marks. See IDL documentation for
; graphics keywords for additional information.
; xtitle: in, optional, type=string
; Set this keyword to the X title of the plot.
; ystyle: in, optional, type=integer, default=1
; If unused in the program, set to 1 to force exact axis scaling.
; ythick: in, optional, type=integer, default=1
; The thickness of the Y axis annotations.
; yticklen: in, optional, type=float, default=0.025
; The length of the Y tick marks. Set to a negative value to create outward
; facing tick marks.
; yticks: in, optional, type=integer
; The number of tick intervals on the Y axis.
; ytickv: in, optional, type=string
; A vector of tick values to use with the tick marks. See IDL documentation for
; graphics keywords for additional information.
; ytitle: in, optional, type=string
; Set this keyword to the Y title of the plot.
; _ref_extra: in, optional, type=any
; Any keyword appropriate for the `IDL Contour command <http://www.exelisvis.com/docs/CONTOUR_Procedure.html>`
; is allowed in the program.
;
; :Examples:
; Use as you would use the IDL CONTOUR command::
; data = dist(51)
; cgContour, data
; LoadCT, 33
; cgContour, data, /FILL
; cgContour, data, /OVERPLOT
;
; If you wish to overplot on top of an image, use the ONIMAGE keyword, rather
; than the OVERPLOT keyword:
; cgImage, data, /SCALE, XRANGE=[-10, 10], YRANGE=[-5,5], /AXES
; cgContour, data, /ONIMAGE
;
;
; See `Device Independent Contour Plots <http://www.idlcoyote.com/graphics_tips/cgcontour.html>`
; for additional examples.
;
; :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, 11 November 2010. DWF.
; Restored the CELL_FILL keyword, which had been accidentally removed in
; the earlier version. 12 November 2010. DWF.
; Add the ability to specify the contour colors as color names. 16 November 2010. DWF.
; Now setting decomposition state by calling cgSetColorState. 16 November 2010. DWF.
; Final color table restoration skipped in Z-graphics buffer. 17 November 2010. DWF.
; Background keyword now applies in PostScript file as well. 17 November 2010. DWF.
; Many changes after BACKGROUND changes to get !P.MULTI working again! 18 November 2010. DWF.
; Fixed a small problem with the OVERPLOT keyword. 18 Nov 2010. DWF.
; Changes so that color variables don't change type. 23 Nov 2010. DWF.
; Added WINDOW keyword to allow graphic to be displayed in a resizable graphics window. 8 Dec 2010. DWF
; Modifications to allow cgContour to be drop-in replacement for old Contour commands in
; indexed color mode. 24 Dec 2010. DWF.
; Previous changes introduced problems with OVERPLOT that have now been fixed. 28 Dec 2010. DWF.
; Set NOERASE keyword from !P.NoErase system variable when appropriate. 28 Dec 2010. DWF.
; Additional problems with NOERASE discovered and solved. 29 Dec 2010. DWF.
; Change to DECOMPOSED color was using incorrect color tables. 29 Dec 2010. DWF.
; In some cases, I was turning BYTE values to strings without converting to
; INTEGERS first. 30 Dec 2010. DWF.
; Still working on getting contour colors to work in decomposed color mode in all
; circumstances. 2 Jan 2011. DWF.
; Fixed problem with FILL when no contour colors (C_COLORS) are specified. 3 Jan 2011. DWF.
; Fixed a problem that preventing output keyword (e.g., PATH_INFO) from being returned properly.
; 3 Jan 2011. DWF.
; Fixed a problem calculating NLEVELS when LEVELS keyword was used instead. 3 Jan 2011. DWF.
; TVLCT commands protected from NULL device. 4 Jan 2011. DWF.
; Fixed a no color problem when CELL_FILL was set. 11 Jan 2011. DWF.
; Fixed a problem with overlaying filled contours with /OVERPLOT. 11 Jan 2011. DWF.
; Selecting character size now with cgDefCharSize. 11 Jan 2011. DWF.
; Moved setting to decomposed color before color selection process to avoid PostScript
; background problems when passed 24-bit color integers. 12 Jan 2011. DWF.
; Fixed a problem in which I assumed the background color was a string. 18 Jan 2011. DWF.
; Added ADDCMD keyword. 26 Jan 2011. DWF.
; Added LAYOUT keyword. 28 Jan 2011. DWF.
; Added PALETTE keyword. 4 Feb 2011. DWF.
; Color table vectors must be obtained AFTER loading the color palette. 6 March 2011. DWF.
; Modified error handler to restore the entry decomposition state if there is an error. 17 March 2011. DWF
; Modifications to allow palettes of less than 256 elememts in length to be used. 1 April 2011. DWF.
; Modifications to repair axes and tickmarks when creating filled contour plots. 28 May 2011. DWF.
; Whoops! Last fix shouldn't apply to OVERPLOTTING. Fixed. 22 June 2011. DWF.
; Still more work to get axes overplotting to work correct. 5 July 2011. DWF.
; Added an ONIMAGE keyword that allows the contours to be overplotted on top of an image that
; has been displayed with cgImage. This requires that the SAVE keyword is set in the
; cgImage call.
; Improved error handling. 26 Aug 2011. DWF.
; Got the data type correct in the part of the code that creates levels. 6 Sept 2011. DWF.
; Small change to allow cgWindow to set the current graphics window if it is the only
; window on the display. 15 Sept 2011. DWF.
; Had to add XTICKV, YTICKV, XTICKS, and YTICKS keywords to get repaired axes to work
; properly on filled contour plots. There may be other keywords needed, but I am
; going to add them on an as-needed basis. 30 Sept 2011. DWF.
; Other keywords WERE needed! I added XTICKLEN and YTICKLEN keywords to the repaired axes
; code. 3 Oct 2011. DWF.
; Change from 15 Sept 2011 forgot to include the possibility of pixmap windows. Algorithm
; made more robust. 27 Oct 2011. DWF.
; There was a problem with axes when plotting contours in 3D that has been fixed. 18 Nov 2011. DWF.
; Added OLEVELS keyword. 7 Dec 2011. DWF.
; Added OUTLINE and OUTCOLOR keywords. 8 Dec 2011. DWF.
; Modified the way the axes are drawn when given a negative tick length. 9 Dec 2011. DWF.
; Added the ability to send the output directly to a file via the OUTPUT keyword. 9 Dec 2011, DWF.
; PostScript, PDF, and Imagemagick parameters can now be tailored with cgWindow_SetDefs. 14 Dec 2001. DWF.
; Made sure the OUTLINE keyword works with CELL_FILL, too. 16 Dec 2011. DWF.
; Modified to use cgDefaultColor for default color selection. 24 Dec 2011. DWF.
; Added MAP_OBJECT keyword. 28 Dec 2011. DWF.
; Changes to allow better default colors, based on changes to cgColor and cgDefaultColor. 1 Feb 2012. DWF.
; Axis repair for filled contour plots (done with AXIS) results in incorrect tick labeling with
; date/time axes. Replaced repair code with actual Contour command. 9 March 2012. DWF.
; Fixed a problem with color palettes by defining NLEVELS according to the number of colors
; in the palette. 19 March 2012. DWF.
; Now allowing the user to draw in the "background" color, if the COLOR or AXISCOLOR is "BACKGROUND". 19 March 2012. DWF.
; The axis repair change on 9 March was not working in multi plots because the plot was already
; advanced. Added a fix to make sure the repair is to the correct multi plot. 20 April 2012. DWF.
; Added an ASPECT keyword to maintain the program aspect ratio. 12 July 2012. DWF.
; Added the ability to use escape characters in plot titles to specify cgSymbol symbols. 27 July 2012. DWF.
; Added C_ANNOTATION keyword. 10 Nov 2012. DWF.
; Modified the way default colors are selected when the background color is "white". 4 Dec 2012. DWF.
; Making more effort to set the CELL_FILL keyword instead of FILL if filling contours on maps. 7 Jan 2013. DWF.
; Added C_ORIENTATION and C_SPACING keywords and modified the program to allow line filling. 28 Jan 2013. DWF.
; Added ISOTROPIC keyword. 27 June 2013. DWF.
; Added sanity check for ISOTROPIC keyword. 6 Feb 2014. DWF.
; Fixed a bug with the ISOTROPIC keyword. 23 Feb 2014. DWF.
; Previously, I used the Aspect function to calculate a position of the plot in the window. This was causing
; problems when encapsulated PostScript files were created, because Aspect uses a landscape aspect ratio and EPS
; files can only be written in Portrait mode. I also modified the default position to be [0.15, 0.15, 0.915, 0.915],
; but I am doing this ONLY for graphics windows, not in PostScript output. This should accommodate a wider range
; of contour plot output. If you find axes cut off, use the POSITION keyword to position the plot correctly. 19 March 2014. DWF
; Previous fix caused other problems. Reverted to 23 Feb 2014 version of cgContour and have tried another way
; to solve encapsulated ASPECT problem. Now setting initial position in window with cgAspect. Appears to be
; working correctly. 25 Nov 2014. DWF.
;
; :Copyright:
; Copyright (c) 2010-2014, Fanning Software Consulting, Inc.
;-
PRO cgContour, data, x, y, $
ADDCMD=addcmd, $
ASPECT=aspect, $
AXISCOLOR=saxiscolor, $
AXESCOLOR=saxescolor, $
BACKGROUND=sbackground, $
C_ANNOTATION=c_annotation, $
C_CHARSIZE=c_charsize, $
C_COLORS=c_colors, $
C_LABELS=c_labels, $
C_ORIENTATION=c_orientation, $
C_SPACING=c_spacing, $
CELL_FILL=cell_fill, $
CHARSIZE=charsize, $
COLOR=scolor, $
FILL=fill, $
FONT=font, $
ISOTROPIC=isotropic, $
IRREGULAR=irregular, $
LABEL=label, $
LAYOUT=layout, $
LEVELS=levels, $
NLEVELS=nlevels, $
NOCLIP=noclip, $
NOERASE=noerase, $
MAP_OBJECT=map_object, $
MISSINGVALUE=missingvalue, $
OLEVELS=olevels, $
ONIMAGE=onImage, $
OUTCOLOR=outcolor, $
OUTFILENAME=outfilename, $
OUTLINE=outline, $
OUTPUT=output, $
OVERPLOT=overplot, $
PALETTE=palette, $
POSITION=position, $
RESOLUTION=resolution, $
T3D=t3d, $
TITLE=title, $
TRADITIONAL=traditional, $
WINDOW=window, $
XSTYLE=xstyle, $
XTHICK=xthick, $
XTICKLEN=xticklen, $
XTICKV=xtickv, $
XTICKS=xticks, $
XTITLE=xtitle, $
YSTYLE=ystyle, $
YTHICK=ythick, $
YTICKLEN=yticklen, $
YTICKV=ytickv, $
YTICKS=yticks, $
YTITLE=ytitle, $
ZVALUE=zvalue, $
_REF_EXTRA=extra
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
IF N_Elements(thisMulti) NE 0 THEN !P.Multi = thisMulti
IF (!D.Name NE "NULL") && (N_Elements(rr) NE 0) THEN TVLCT, rr, gg, bb
IF N_Elements(currentState) NE 0 THEN cgSetColorState, currentState
RETURN
ENDIF
; Check parameters.
IF N_Elements(data) EQ 0 THEN BEGIN
Print, 'USE SYNTAX: cgContour, data, x, y, NLEVELS=10'
RETURN
ENDIF
; Set up PostScript device for working with colors.
IF !D.Name EQ 'PS' THEN Device, COLOR=1, BITS_PER_PIXEL=8
; Check parameters.
IF N_Params() EQ 0 THEN BEGIN
Print, 'USE SYNTAX: cgContour, data, x, y'
RETURN
ENDIF
; Do they want this plot in a resizeable graphics window?
IF Keyword_Set(addcmd) THEN window = 1
IF Keyword_Set(window) AND ((!D.Flags AND 256) NE 0) THEN BEGIN
; If you are using a layout, you can't ever erase.
IF N_Elements(layout) NE 0 THEN noerase = 1
IF Keyword_Set(overplot) OR Keyword_Set(addcmd) THEN BEGIN
cgWindow, 'cgContour', data, x, y, $
ASPECT=aspect, $
AXISCOLOR=saxiscolor, $
AXESCOLOR=saxescolor, $
BACKGROUND=sbackground, $
C_ANNOTATION=c_annotation, $
C_CHARSIZE=c_charsize, $
C_COLORS=c_colors, $
C_LABELS=c_labels, $
C_ORIENTATION=c_orientation, $
C_SPACING=c_spacing, $
CELL_FILL=cell_fill, $
CHARSIZE=charsize, $
COLOR=scolor, $
FONT=font, $
FILL=fill, $
ISOTROPIC=isotropic, $
IRREGULAR=irregular, $
LABEL=label, $
LAYOUT=layout, $
LEVELS=levels, $
NLEVELS=nlevels, $
NOCLIP=noclip, $
NOERASE=noerase, $
MAP_OBJECT=map_object, $
MISSINGVALUE=missingvalue, $
OLEVELS=olevels, $
ONIMAGE=onimage, $
OUTCOLOR=outcolor, $
OUTLINE=outline, $
OVERPLOT=overplot, $
PALETTE=palette, $
POSITION=position, $
RESOLUTION=resolution, $
T3D=t3d, $
TITLE=title, $
TRADITIONAL=traditional, $
XSTYLE=xstyle, $
XTHICK=xthick, $
XTICKLEN=xticklen, $
XTICKV=xtickv, $
XTICKS=xticks, $
XTITLE=xtitle, $
YSTYLE=ystyle, $
YTHICK=ythick, $
YTICKLEN=yticklen, $
YTICKV=ytickv, $
YTICKS=yticks, $
YTITLE=ytitle, $
ZVALUE=zvalue, $
ADDCMD=1, $
_Extra=extra
RETURN
ENDIF
currentWindow = cgQuery(/CURRENT, COUNT=wincnt)
IF wincnt EQ 0 THEN replaceCmd = 0 ELSE replaceCmd=1
cgWindow, 'cgContour', data, x, y, $
ASPECT=aspect, $
AXISCOLOR=saxiscolor, $
AXESCOLOR=saxescolor, $
BACKGROUND=sbackground, $
C_ANNOTATION=c_annotation, $
C_CHARSIZE=c_charsize, $
C_COLORS=c_colors, $
C_LABELS=c_labels, $
C_ORIENTATION=c_orientation, $
C_SPACING=c_spacing, $
CELL_FILL=cell_fill, $
CHARSIZE=charsize, $
COLOR=scolor, $
FONT=font, $
FILL=fill, $
ISOTROPIC=isotropic, $
IRREGULAR=irregular, $
LABEL=label, $
LAYOUT=layout, $
LEVELS=levels, $
NLEVELS=nlevels, $
NOCLIP=noclip, $
NOERASE=noerase, $
MAP_OBJECT=map_object, $
MISSINGVALUE=missingvalue, $
OLEVELS=olevels, $
ONIMAGE=onimage, $
OUTCOLOR=outcolor, $
OUTLINE=outline, $
OVERPLOT=overplot, $
PALETTE=palette, $
POSITION=position, $
RESOLUTION=resolution, $
T3D=t3d, $
TITLE=title, $
TRADITIONAL=traditional, $
XSTYLE=xstyle, $
XTHICK=xthick, $
XTICKLEN=xticklen, $
XTICKV=xtickv, $
XTICKS=xticks, $
XTITLE=xtitle, $
YSTYLE=ystyle, $
YTHICK=ythick, $
YTICKLEN=yticklen, $
YTICKV=ytickv, $
YTICKS=yticks, $
YTITLE=ytitle, $
ZVALUE=zvalue, $
REPLACECMD=replaceCmd, $
_Extra=extra
RETURN
ENDIF
; Are we doing some kind of output?
IF (N_Elements(output) NE 0) && (output NE "") THEN BEGIN
; If the output string has a dot character, then this must be a
; filename, and we will determine the type of file from the filename extension.
IF StrPos(output, '.') NE -1 THEN BEGIN
root_name = cgRootName(output, DIRECTORY=theDir, EXTENSION=ext)
IF theDir EQ "" THEN CD, CURRENT=theDir
outfilename = output
outputSelection = StrUpCase(ext)
ENDIF
IF N_Elements(outputSelection) EQ 0 THEN outputSelection = StrUpCase(output)
typeOfOutput = ['PS','EPS','PDF','BMP','GIF','JPEG','JPG','PNG','TIFF', 'TIF']
void = Where(typeOfOutput EQ outputSelection, count)
IF count EQ 0 THEN Message, 'Cannot find ' + outputSelection + ' in allowed output types.'
; Set things up.
CASE outputSelection OF
'PS': BEGIN
ext = '.ps'
delete_ps = 0
END
'EPS': BEGIN
ext = '.eps'
encapsulated = 1
delete_ps = 0
END
'PDF': BEGIN
ext = '.pdf'
pdf_flag = 1
delete_ps = 1
END
'BMP': BEGIN
ext = '.bmp'
bmp_flag = 1
delete_ps = 1
END
'GIF': BEGIN
ext = '.gif'
gif_flag = 1
delete_ps = 1
END
'JPEG': BEGIN
ext = '.jpg'
jpeg_flag = 1
delete_ps = 1
END
'JPG': BEGIN
ext = '.jpg'
jpeg_flag = 1
delete_ps = 1
END
'PNG': BEGIN
ext = '.png'
png_flag = 1
delete_ps = 1
END
'TIFF': BEGIN
ext = '.tif'
tiff_flag = 1
delete_ps = 1
END
'TIF': BEGIN
ext = '.tif'
tiff_flag = 1
delete_ps = 1
END
ENDCASE
; Do you need a filename?
IF ( (N_Elements(outfilename) EQ 0) || (outfilename EQ "") ) THEN BEGIN
filename = 'cgplot' + ext
outfilename = cgPickfile(FILE=filename, TITLE='Select Output File Name...', $
FILTER=ext, /WRITE)
IF outfilename EQ "" THEN RETURN
ENDIF
; We need to know the root name of the file, because we have to make a PostScript
; file of the same name. At least we do if the type is not PS or EPS.
IF (outputSelection NE 'PS') && (outputSelection NE 'EPS') THEN BEGIN
root_name = cgRootName(outfilename, DIRECTORY=theDir)
IF theDir EQ "" THEN CD, CURRENT=theDir
ps_filename = Filepath(ROOT_DIR=theDir, root_name + '.ps')
ENDIF ELSE ps_filename = outfilename
; Get the output default values.
cgWindow_GetDefs, $
PS_Charsize = ps_charsize, $ ; The PostScript character size.
PS_FONT = ps_font, $ ; Select the font for PostScript output.
PS_Decomposed = ps_decomposed, $ ; Sets the PostScript color mode.
PS_Delete = ps_delete, $ ; Delete PS file when making IM raster.
PS_Metric = ps_metric, $ ; Select metric measurements in PostScript output.
PS_Scale_factor = ps_scale_factor, $ ; Select the scale factor for PostScript output.
PS_TT_Font = ps_tt_font ; Select the true-type font to use for PostScript output.
; Set up the PostScript device.
cgPS_Open, $
CHARSIZE=ps_charsize, $
DECOMPOSED=ps_decomposed, $
FILENAME=ps_filename, $
FONT=ps_font , $
ENCAPSULATED=encapsulated, $
METRIC=ps_metric, $
SCALE_FACTOR=ps_scale_factor, $
TT_FONT=ps_tt_font, $
QUIET=1
ENDIF
; If you supplied annotation, check it for embedded symbols.
IF N_Elements(c_annotation) NE 0 THEN BEGIN
FOR j=0,N_Elements(c_annotation)-1 DO c_annotation[j] = cgCheckForSymbols(c_annotation[j])
ENDIF
; Handle data properly.
ndims = Size(data, /N_DIMENSIONS)
s = Size(data, /DIMENSIONS)
CASE ndims OF
1: BEGIN
IF N_Elements(x) EQ 0 THEN BEGIN
IF Keyword_Set(onImage) THEN BEGIN
CASE !X.TYPE OF
0: xgrid = cgScaleVector(Indgen(s[0]), !X.CRange[0], !X.CRange[1])
1: xgrid = cgScaleVector(Indgen(s[0]), 10^!X.CRange[0], 10^!X.CRange[1])
3: Message, 'Must supply LONGITUDE vector when overplotting on map projections'
ENDCASE
ENDIF ELSE BEGIN
xgrid = Indgen(s[0])
ENDELSE
ENDIF ELSE xgrid = x
IF N_Elements(y) EQ 0 THEN BEGIN
IF Keyword_Set(onImage) THEN BEGIN
CASE !Y.TYPE OF
0: ygrid = cgScaleVector(Indgen(s[1]), !Y.CRange[0], !Y.CRange[1])
1: ygrid = cgScaleVector(Indgen(s[1]), 10^!Y.CRange[0], 10^!Y.CRange[1])
3: Message, 'Must supply LATITUDE vector when overplotting on map projections'
ENDCASE
ENDIF ELSE BEGIN
ygrid = Indgen(s[1])
ENDELSE
ENDIF ELSE ygrid = y
END
2: BEGIN
IF N_Elements(x) EQ 0 THEN BEGIN
IF Keyword_Set(onImage) THEN BEGIN
CASE !X.TYPE OF
0: xgrid = cgScaleVector(Indgen(s[0]), !X.CRange[0], !X.CRange[1])
1: xgrid = cgScaleVector(Indgen(s[0]), 10^!X.CRange[0], 10^!X.CRange[1])
3: Message, 'Must supply LONGITUDE vector when overplotting on map projections'
ENDCASE
ENDIF ELSE BEGIN
xgrid = Indgen(s[0])
ENDELSE
ENDIF ELSE xgrid = x
IF N_Elements(y) EQ 0 THEN BEGIN
IF Keyword_Set(onImage) THEN BEGIN
CASE !Y.TYPE OF
0: ygrid = cgScaleVector(Indgen(s[1]), !Y.CRange[0], !Y.CRange[1])
1: ygrid = cgScaleVector(Indgen(s[1]), 10^!Y.CRange[0], 10^!Y.CRange[1])
3: Message, 'Must supply LATITUDE vector when overplotting on map projections'
ENDCASE
ENDIF ELSE BEGIN
ygrid = Indgen(s[1])
ENDELSE
ENDIF ELSE ygrid = y
END
ELSE: Message, 'Contour data must be 1D or 2D.'
ENDCASE
; Is the ISOTROPIC keyword set?
IF Keyword_Set(isotropic) THEN BEGIN
yscaleTest = Max(ygrid, /NaN) - Min(ygrid, /NaN)
xscaleTest = Max(xgrid, /NaN) - Min(xgrid, /NaN)
aspect = Float(yscaleTest)/xscaleTest
; Do a sanity check.
IF (aspect LT 1e-2) || (aspect GT 100) THEN $
Message, 'Axes ranges are incompatible with the ISOTROPIC keyword. Try using ASPECT.'
xscale = xscaleTest
yscale = yscaleTest
xstyle=1
ystyle=1
ENDIF
IF Keyword_Set(isotropic) THEN BEGIN
IF N_Elements(xgrid) NE 0 THEN xrange = Max(xgrid, /NaN) - Min(xgrid, /NaN)
IF N_Elements(ygrid) NE 0 THEN yrange = Max(ygrid, /NaN) - Min(ygrid, /NaN)
dims = Size(data, /Dimensions)
IF N_Elements(x) EQ 0 THEN xrange = dims[0]
IF N_Elements(y) EQ 0 THEN yrange = dims[1]
aspect = Double(yrange) / xrange
; Do a sanity check.
IF (aspect LT 1e-2) || (aspect GT 100) THEN $
Message, 'Axes ranges are incompatible with the ISOTROPIC keyword. Try using ASPECT.'
ENDIF
IF (N_Elements(aspect) NE 0) && (Total(!P.MULTI) EQ 0) THEN BEGIN
; If position is set, then fit the plot into those bounds.
IF (N_Elements(position) GT 0) THEN BEGIN
trial_position = cgAspect(aspect, /Single_Plot)
trial_width = trial_position[2]-trial_position[0]
trial_height = trial_position[3]-trial_position[1]
pos_width = position[2]-position[0]
pos_height = position[3]-position[1]
; Same logic as cgImage: try to fit image width, then if you can't get the right aspect
; ratio, fit the image height instead.
fit_ratio = pos_width / trial_width
IF trial_height * fit_ratio GT pos_height THEN $
fit_ratio = pos_height / trial_height
; new width and height
trial_width *= fit_ratio
trial_height *= fit_ratio
; calculate position vector based on trial_width and trial_height
position[0] += 0.5*(pos_width - trial_width)
position[2] -= 0.5*(pos_width - trial_width)
position[1] += 0.5*(pos_height - trial_height)
position[3] -= 0.5*(pos_height - trial_height)
ENDIF ELSE BEGIN
position=cgAspect(aspect, /Single_Plot)
ENDELSE
ENDIF
; If you want to overplot on an image, set the OVERPLOT keyword.
IF Keyword_Set(onImage) THEN overplot = 1
; Going to have to do all of this in decomposed color, if possible.
cgSetColorState, 1, CURRENTSTATE=currentState
; If current state is "indexed color" and colors are represented as long integers then "fix" them.
IF (currentState EQ 0) THEN BEGIN
IF Size(sbackground, /TNAME) EQ 'LONG' THEN sbackground = Fix(sbackground)
IF Size(saxiscolor, /TNAME) EQ 'LONG' THEN saxiscolor = Fix(saxiscolor)
IF Size(saxescolor, /TNAME) EQ 'LONG' THEN saxescolor = Fix(saxescolor)
IF Size(scolor, /TNAME) EQ 'LONG' THEN scolor = Fix(scolor)
ENDIF
; Pay attention to !P.Noerase in setting the NOERASE kewyord. This must be
; done BEFORE checking the LAYOUT properties.
IF !P.NoErase NE 0 THEN noerase = !P.NoErase ELSE noerase = Keyword_Set(noerase)
; Set up the layout, if necessary.
IF N_Elements(layout) NE 0 THEN BEGIN
thisMulti = !P.Multi
totalPlots = layout[0]*layout[1]
!P.Multi = [0,layout[0], layout[1], 0, 0]
IF layout[2] EQ 1 THEN BEGIN
noerase = 1
!P.Multi[0] = 0
ENDIF ELSE BEGIN
!P.Multi[0] = totalPlots - layout[2] + 1
ENDELSE
ENDIF
; Character size has to be determined *after* the layout has been decided.
IF N_Elements(font) EQ 0 THEN font = !P.Font
IF Keyword_Set(t3d) && (!D.Name EQ 'PS') THEN font = -1
IF N_Elements(title) EQ 0 THEN title = "" ELSE title = cgCheckForSymbols(title)
IF N_Elements(xtitle) EQ 0 THEN xtitle = "" ELSE xtitle = cgCheckForSymbols(xtitle)
IF N_Elements(ytitle) EQ 0 THEN ytitle = "" ELSE ytitle = cgCheckForSymbols(ytitle)
IF N_Elements(charsize) EQ 0 THEN charsize = cgDefCharSize(FONT=font)
IF N_Elements(c_charsize) EQ 0 THEN c_charsize = charsize * 0.75
; Get the current color table vectors. The NULL business was put here at
; the request of Wayne Landsman in support of NASA Astronomy Library. It
; is important for programs NASA runs.
IF (!D.Name NE 'NULL') THEN BEGIN
; If you have a palette, load the colors now. Otherwise whatever colors
; are in the current color table will be used. If you are using a palette,
; you should NOT use C_COLORS, so I undefine it.
IF N_Elements(palette) NE 0 THEN BEGIN
IF Size(palette, /N_DIMENSIONS) NE 2 THEN Message, 'Color palette is not a 3xN array.'
dims = Size(palette, /DIMENSIONS)
threeIndex = Where(dims EQ 3)
IF ((threeIndex)[0] LT 0) THEN Message, 'Color palette is not a 3xN array.'
IF threeIndex[0] EQ 0 THEN palette = Transpose(palette)
TVLCT, p_red, p_grn, p_blu, /Get ; Save the color vectors before loading the palette.
TVLCT, palette
; Set up contour colors for the palette. If you passed contour colors,
; then I assume these are indices into the color palette.
IF N_Elements(c_colors) NE 0 THEN con_colors = cgColor24(palette[c_colors,*])
; If the palette contains fewer colors than the color table, then I assume
; the palette is just for contour colors.
IF (N_Elements(c_colors) EQ 0) && ((N_Elements(palette)/3) LT 256) THEN BEGIN
con_colors = cgColor24(palette)
ENDIF
; If the number of contour colors is less than 256, and LEVELS and NLEVELS are
; both undefined, then let's define NLEVELS to be equal to the number of contour
; colors in the color palette.
dims = Size(palette, /DIMENSIONS) ; First dimension is now the number of colors.
IF (dims[0] LT 256) && (N_Elements(levels) EQ 0) && (N_Elements(nlevels) EQ 0) THEN BEGIN
nlevels = dims[0]
ENDIF
ENDIF
; Get the color table vectors. Must do AFTER loading the palette, or
; PostScript can't be produced properly.
TVLCT, rr, gg, bb, /GET
ENDIF
; Check the color keywords.
background = cgDefaultColor(sbackground, /BACKGROUND, TRADITIONAL=traditional)
IF Size(background, /TNAME) EQ 'STRING' && (StrUpCase(background[0]) EQ 'WHITE') THEN BEGIN
IF (N_Elements(saxisColor) EQ 0) && (N_Elements(saxesColor) NE 0) THEN saxisColor = saxesColor
axisColor = cgDefaultColor(saxisColor, DEFAULT='black', TRADITIONAL=traditional)
color = cgDefaultColor(sColor, DEFAULT='black', TRADITIONAL=traditional)
ENDIF ELSE BEGIN
IF (N_Elements(saxisColor) EQ 0) && (N_Elements(saxesColor) NE 0) THEN saxisColor = saxesColor
axisColor = cgDefaultColor(saxisColor, TRADITIONAL=traditional)
color = cgDefaultColor(sColor, DEFAULT=axisColor, TRADITIONAL=traditional)
ENDELSE
; If color is the same as background, do something. Since this precludes drawing the the
; background color (perhaps you want to "erase" something), I offer an exception. If the
; COLOR is "Background", I am going to assume you know what you are doing!
IF ColorsAreIdentical(background, color) THEN BEGIN
IF ((!D.Flags AND 256) NE 0) THEN BEGIN
IF (!P.Multi[0] EQ 0) && (~Keyword_Set(overplot) && ~noerase) THEN cgErase, background
ENDIF
IF (Size(color, /TNAME) EQ 'STRING') THEN BEGIN
IF (StrUpCase(color) NE 'BACKGROUND') THEN color = 'OPPOSITE'
ENDIF ELSE color = 'OPPOSITE'
ENDIF
IF ColorsAreIdentical(background, axiscolor) THEN BEGIN
IF ((!D.Flags AND 256) NE 0) THEN BEGIN
IF (!P.Multi[0] EQ 0) && (~Keyword_Set(overplot) && ~noerase) THEN cgErase, background
ENDIF
IF (Size(axiscolor, /TNAME) EQ 'STRING') THEN BEGIN
IF (StrUpCase(axiscolor) NE 'BACKGROUND') THEN axiscolor = 'OPPOSITE'
ENDIF ELSE axiscolor = 'OPPOSITE'
ENDIF
; Default values for keywords.
fill = Keyword_Set(fill)
; Really need CELL_FILL instead of FILL if you are overplotting onto a map projection.
IF fill && ((N_Elements(map_object) NE 0) || (!X.Type EQ 3)) && Keyword_Set(overplot) THEN BEGIN
fill = 0
cell_fill = 1
ENDIF
cell_fill = Keyword_Set(cell_fill)
irregular = Keyword_Set(irregular)
SetDefaultValue, label, 1
SetDefaultValue, resolution, [41,41]
SetDefaultValue, outcolor, 'charcoal'
outline = Keyword_Set(outline)
IF N_Elements(nlevels) EQ 0 THEN BEGIN
IF N_Elements(levels) EQ 0 THEN nlevels = 6 ELSE nlevels = N_Elements(levels)
ENDIF
t3d = Keyword_Set(t3d)
IF t3d THEN BEGIN
IF N_Elements(zvalue) EQ 0 THEN zvalue = 0
IF N_Elements(noclip) EQ 0 THEN noclip = 1
ENDIF
noclip = Keyword_Set(noclip)
SetDefaultValue, xstyle, 1
SetDefaultValue, ystyle, 1
IF N_Elements(missingvalue) NE 0 THEN BEGIN
IF (Size(data, /TNAME) NE 'FLOAT') $
AND (Size(data, /TNAME) NE 'DOUBLE') $
THEN contourData = Float(data) ELSE contourData = data
missingIndices = Where(contourData EQ missingValue[0], missingCount)
IF missingCount GT 0 THEN BEGIN
contourData[missingIndices] = !Values.F_NAN
IF Keyword_Set(fill) THEN BEGIN
fill = 0
cell_fill = 1
ENDIF
ENDIF
ENDIF ELSE contourData = data
; Handle gridding of irregular data.
IF irregular THEN BEGIN
Triangulate, xgrid, ygrid, triangles
contourData = Trigrid(xgrid, ygrid, contourData, triangles, $
NX=resolution[0], NY=resolution[1], $
XGRID=xgrid, YGRID=ygrid, MISSING=!Values.F_NAN)
IF Keyword_Set(fill) THEN BEGIN
fill = 0
cell_fill = 1
ENDIF
ENDIF
; Do you need to calculate levels.
IF N_Elements(levels) EQ 0 THEN BEGIN
minData = Min(contourData, /NAN, MAX=maxData)
IF Size(minData, /TYPE) EQ 2 THEN minData = Float(minData) ;Avoid 16 bit integer overflow
levels = ((maxData - minData) / Float(nlevels)) * Indgen(nlevels) + minData
ENDIF
; Need to make sure contour colors are integers if they are indices.
IF N_Elements(c_colors) NE 0 THEN BEGIN
IF Size(c_colors, /TNAME) NE 'STRING' THEN BEGIN
IF (Size(c_colors, /TYPE) EQ 3) && (Max(c_colors) LE 255) THEN BEGIN
con_colors = Fix(c_colors)
ENDIF ELSE BEGIN
IF N_Elements(palette) NE 0 THEN BEGIN
TVLCT, palette
IF (!D.Name NE 'NULL') THEN TVLCT, rrr, ggg, bbb, /Get
rrr = Congrid(rrr, nlevels)
ggg = Congrid(ggg, nlevels)
bbb = Congrid(bbb, nlevels)
IF (!D.Name NE 'NULL') THEN TVLCT, rrr, ggg, bbb, 1
IF N_Elements(con_colors) EQ 0 THEN con_colors = StrTrim(Indgen(nlevels)+1,2)
ENDIF ELSE BEGIN
con_colors = c_colors
ENDELSE
ENDELSE
ENDIF ELSE con_colors = c_colors
ENDIF ELSE BEGIN
IF Keyword_Set(fill) OR Keyword_Set(cell_fill) THEN BEGIN
IF N_Elements(palette) NE 0 THEN IF (!D.Name NE 'NULL') THEN TVLCT, palette