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cgerase.pro
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cgerase.pro
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; docformat = 'rst'
;
; NAME:
; cgErase
;
; PURPOSE:
; Provides a device-independent and color-model-independent way to erase a graphics
; window with a particular color.
;
;******************************************************************************************;
; ;
; 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. ;
;******************************************************************************************;
;
;+
; Provides a device-independent and color-model-independent way to erase a graphics
; window with a particular color.
;
; :Categories:
; Graphics
;
; :Params:
; background_color: in, optional, type=string/integer/long, default='white'
; The color to use in erasing the graphics window. Default is "white."
; Color names are those used with cgColor.
;
; :Keywords:
; color: in, optional, type=string/integer/long, default='white'
; An alternative way to specify the color to use in erasing the graphics window.
; Color names are those used with cgColor. This parameter is used in
; preference to the background_color parameter.
; 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. If this keyword is used, only this portion of the window is erased.
; window: in, optional, type=boolean, default=0
; Set this keyword to erase the current cgWindow application. "Erasing" in
; this case means removing all the current commands.
;
; :Examples:
; Used to "erase" various things::
; IDL> cgErase
; IDL> cgErase, 'gray'
; IDL> cgErase, COLOR='charcoal'
;
; IDL> cgPlot, cgDemoData(1), /Window
; IDL> cgErase, /Window
;
; IDL> cgPlot, cgDemoData(17), Layout=[2,2,1]
; IDL> cgPlot, cgDemoData(17), Layout=[2,2,4]
; IDL> cgErase, Layout=[2,2,1]
;
; :Author:
; FANNING SOFTWARE CONSULTING::
; David W. Fanning
; 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
;
; :History:
; Change History::
; Written, 12 November 2010. DWF.
; Modified so that input variables are not changed. 18 Nov 2010. DWF.
; Got my color selection algorithm right. COLOR keyword takes precedence
; over the parameter. 18 Nov 2010. DWF.
; Modified to erase in decomposed color, if possible.
; In some cases, I was turning BYTE values to strings without converting to
; INTEGERS first. 30 Dec 2010. DWF.
; Added WINDOW keyword. 26 Jan 2011. DWF.
; Added LAYOUT keyword. 1 Feb 2011. DWF.
; Modified error handler to restore the entry decomposition state if there is an error. 17 March 2011. DWF
;
; :Copyright:
; Copyright (c) 2010, Fanning Software Consulting, Inc.
;-
PRO cgErase, background_color, COLOR=color, LAYOUT=layout, WINDOW=window
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /Cancel
IF N_Elements(currentState) NE 0 THEN cgSetColorState, currentState
RETURN
ENDIF
; Are we erasing an cgWindow application?
IF Keyword_Set(window) THEN BEGIN
currentID = cgQuery(COUNT=wincnt, OBJECTREF=currentObj, /Current)
IF wincnt GT 0 THEN BEGIN
currentObj -> DeleteCommand, /All
currentObj -> ExecuteCommands
ENDIF
RETURN
ENDIF
; Set up PostScript device for working with colors.
IF !D.Name EQ 'PS' THEN Device, COLOR=1, BITS_PER_PIXEL=8
; Get a color for erasing.
IF N_Elements(background_color) EQ 0 THEN thisColor = 'white' ELSE thisColor = background_color
IF N_Elements(color) NE 0 THEN thisColor = color
IF Size(thisColor, /TYPE) EQ 3 THEN IF cgGetColorState() EQ 0 THEN thisColor = Byte(thisColor)
IF Size(thisColor, /TYPE) LE 2 THEN thisColor = StrTrim(Fix(thisColor),2)
; Get the current color vectors.
TVLCT, rr, gg, bb, /Get
; Do this in decomposed color, if possible.
cgSetColorState, 1, CURRENTSTATE=currentState
IF Size(thisColor, /TNAME) EQ 'STRING' THEN thisColor = cgColor(thisColor)
; 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
; Draw an invisible plot in this space.
Plot, [0,1], XStyle=4, YStyle=4, /NoErase
; Fill the plot area with the color.
x = !X.Region
y = !Y.Region
PolyFill, [x[0], x[0], x[1], x[1]], $
[y[0], y[1], y[1], y[0]], /FIll, $
Color=thisColor, /Normal
!P.Multi = thisMulti
ENDIF ELSE Erase, thisColor
; Clean up.
cgSetColorState, currentState
IF !D.Name NE 'Z' THEN TVLCT, rr, gg, bb
END