/usr/share/gnudatalanguage/coyote/cgpolygon.pro is in gdl-coyote 2016.11.13-2.
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;
; NAME:
; cgPolygon
;
; PURPOSE:
; Provides a device-independent and color-model-independent way to draw a
; filled or unfilled polygon.
;
;******************************************************************************************;
; ;
; 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 draw a
; filled or unfilled polygon.
;
; The program requires the `Coyote Library <http://www.idlcoyote.com/documents/programs.php>`
; to be installed on your machine.
;
; :Categories:
; Graphics
;
; :Params:
; x: in, required, type=number
; A vector argument providing the X coordinates of the points to be connected.
; The vector must contain at least three elements. If only one argument is
; specified, X must be an array of either two or three vectors (i.e., (2,*)
; or (3,*)). In this special case, the vector X[0,*] specifies the X values,
; X[1,*] specifies Y, and X[2,*] contain the Z values.
; y: in, required, type=number
; A vector argument providing the Y coordinates of the points to be connected.
; Y must contain at least three elements.
; z: in, optional, type=number
; An optional vector argument providing the Z coordinates of the points to be
; connected. Z must contain at least three elements.
;
; :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.
; checkforfinite: in, optional, type=boolean, default=0
; If the input data is not finite (i.e., it contains NaNs), then the drawing of
; the polygons will be affected. This is particularly true if you are drawing polygons
; on map projections using the `Map_Object` keyword. The program could check all input for NaNs, but
; this would be quite slow when a great number of polygons are being drawn. For this reason,
; the program only checks polygon input when this keyword is set. Only polygons containing all
; finite values are drawn when this keyword is set.
; color: in, optional, type=string, default='rose'
; The name of the polygon color. Color names are those used with cgColor.
; This value can also be a long integer or an index into the current color
; table.
; device: in, optional, type=boolean, default=0
; Set to indicate the polygon vertices are in device coordinates.
; fcolor: in, optional, type=string/integer/long
; The name of the polygon fill color. Color names are those used with cgColor.
; This value can also be a long integer or an index into the current color
; table. The default is the same as `Color`.
; fill: in, optional, type=boolean, default=0
; Set this keyword to draw a filled polygon, rather than an open polygon.
; map_object: in, optional, type=object
; If you are drawing 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`
; parameters from longitude and latitude, respectively, to projected meter space
; before drawing. X and Y must both be present.
; normal: in, optional, type=boolean, default=0
; Set to indicate the polygon vertices are in normalized coordinates.
; position: in, optional, type=fltarr(4)
; Set this keyword to a four-element position array of normalized coordinates
; to fill a rectangular area on the graphics display. The normal input parameters
; are ignored if this keyword is set.
; window: in, optional, type=boolean, default=0
; Set this keyword to add the command to the current cgWindow application.
; _ref_extra: in, optional, type=appropriate
; Any other keywords to the IDL POLYFILL command may be used.
;
;
; :Examples:
; Used like the IDL Plots or Polyfill commands::
; IDL> cgPolygon, [0.25, 0.25, 0.75, 0.75, 0.25], [0.25, 0.75, 0.75, 0.25, 0.25], $
; /NORMAL, COLOR='blue'
; IDL> cgPolygon, [0.25, 0.25, 0.75, 0.75, 0.25], [0.25, 0.75, 0.75, 0.25, 0.25], $
; /NORMAL, COLOR='blue', FCOLOR='rose', /FILL
;
; :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, 26 March 2012. David Fanning.
; Added Position keyword to allow a fill of a particular portion of the graphics
; window. 20 Apr 2012. DWF.
; Added AddCmd keyword. 25 Oct 2012. DWF.
; Added a MAP_OBJECT keyword to allow polygon filling on maps. 16 Dec 2013. DWF.
; Completely forgot to deconstruct a single parameter into component parts. 11 Jan 2014. DWF.
; Added CheckForFinite keyword to check output for NaN values before display. 22 Jan 2014. DWF.
;
; :Copyright:
; Copyright (c) 2012-2014, Fanning Software Consulting, Inc.
;-
PRO cgPolygon, x, y, z, $
ADDCMD=addcmd, $
CHECKFORFINITE=checkForFinite, $
COLOR=color, $
FCOLOR=fcolor, $
FILL=fill, $
MAP_OBJECT=map_object, $
NORMAL=normal, $
DEVICE=device, $
POSITION=position, $
WINDOW=window, $
_REF_EXTRA=extra
Compile_Opt idl2
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
IF N_Elements(currentState) NE 0 THEN cgSetColorState, currentState
RETURN
ENDIF
; Did user pass parameters?
IF (N_Params() EQ 0) AND (N_Elements(position) EQ 0) THEN BEGIN
Print, 'USE SYNTAX: cgPolygon, x, y, [z]'
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
currentWindow = cgQuery(/CURRENT, COUNT=wincnt)
IF wincnt EQ 0 THEN replaceCmd = 0 ELSE replaceCmd=1
; If adding a command, have to do this differently.
IF Keyword_Set(addcmd) THEN BEGIN
cgWindow, 'cgPolygon', x, y, z, $
CHECKFORFINITE=checkForFinite, $
COLOR=color, $
FCOLOR=fcolor, $
FILL=fill, $
MAP_OBJECT=map_object, $
NORMAL=normal, $
DEVICE=device, $
POSITION=position, $
ADDCMD=1, $
_EXTRA=extra
RETURN
ENDIF ELSE BEGIN
; Otherwise, we are just replacing the commands in a new or existing window.
cgWindow, 'cgPolygon', x, y, z, $
CHECKFORFINITE=checkForFinite, $
COLOR=color, $
FCOLOR=fcolor, $
FILL=fill, $
MAP_OBJECT=map_object, $
NORMAL=normal, $
DEVICE=device, $
POSITION=position, $
REPLACECMD=replaceCmd, $
_Extra=extra
RETURN
ENDELSE
ENDIF
; Set up PostScript device for working with colors.
IF !D.Name EQ 'PS' THEN Device, COLOR=1, BITS_PER_PIXEL=8
; We are going to draw in decomposed color, if possible.
cgSetColorState, 1, Current=currentState
; Check for NaNs in the data?
SetDefaultValue, checkForFinite, 0
; If we only have a single parameter, see if it can be deconstructed.
IF N_Params() EQ 1 THEN BEGIN
dims = Size(x, /Dimensions)
ndims = Size(x, /N_Dimensions)
IF ndims EQ 1 THEN Message, 'If a single argument is supplied, it must be a 2D array.'
IF (dims[0] NE 2) && (dims[0] NE 3) THEN Message, 'Input argument is not dimensioned correctly.'
CASE dims[0] OF
2: BEGIN
y = Reform(x[1,*])
x = Reform(x[0,*])
END
3: BEGIN
z = Reform(x[2,*])
y = Reform(x[1,*])
x = Reform(x[0,*])
END
ENDCASE
ENDIF
; If current state is "indexed color" and colors are represented as long integers then "fix" them.
IF (currentState EQ 0) THEN BEGIN
IF Size(color, /TNAME) EQ 'LONG' THEN color = Fix(color)
IF Size(fcolor, /TNAME) EQ 'LONG' THEN fcolor = Fix(fcolor)
ENDIF
; Need a color?
thisColor = cgDefaultColor(color, DEFAULT='rose')
IF N_Elements(fColor) EQ 0 THEN BEGIN
fillColor = thisColor
ENDIF ELSE BEGIN
fillColor = cgDefaultColor(fcolor)
ENDELSE
; Do you need a window?
IF ((!D.Flags AND 256) NE 0) && (!D.Window LT 0) THEN cgDisplay
; Are the colors strings?
IF Size(thisColor, /TNAME) EQ 'STRING' THEN thisColor = cgColor(thisColor)
IF Size(fillColor, /TNAME) EQ 'STRING' THEN fillColor = cgColor(fillColor)
; Are we filling a POSITION in the window?
IF N_Elements(position) NE 0 THEN BEGIN
p = position
x = [p[0], p[0], p[2], p[2], p[0]]
y = [p[1], p[3], p[3], p[1], p[1]]
normal = 1
device = 0
ENDIF
; Get the current color vectors.
TVLCT, rr, gg, bb, /Get
; Do you have a map object? If so, assume lon/lat conversion to projected XY space.
; Check for NaNs, if requested, because some projections can contain a lot of them.
IF Obj_Valid(map_object) THEN BEGIN
xy = map_object -> Forward(x, y, /NoForwardFix)
xr = map_object.xrange
yr = map_object.yrange
_x = Reform(xy[0,*])
_y = Reform(xy[1,*])
IF checkForFinite THEN BEGIN
void = Where(Finite(_x) EQ 0, lonNaNCnt)
void = Where(Finite(_y) EQ 0, latNaNCnt)
ENDIF ELSE BEGIN
lonNaNCnt = 0
latNaNCnt = 0
ENDELSE
ENDIF ELSE BEGIN
_x = x
_y = y
IF checkForFinite THEN BEGIN
void = Where(Finite(_x) EQ 0, lonNaNCnt)
void = Where(Finite(_y) EQ 0, latNaNCnt)
ENDIF ELSE BEGIN
lonNaNCnt = 0
latNaNCnt = 0
ENDELSE
ENDELSE
; Fill the polygon.
IF (lonNaNCnt EQ 0) && (latNaNCnt EQ 0) THEN BEGIN
CASE N_Elements(z) OF
0: BEGIN
IF Keyword_Set(fill) THEN BEGIN
PolyFill, _x, _y, COLOR=fillColor, NORMAL=normal, DEVICE=device, _EXTRA=extra
PlotS, _x, _y, COLOR=thisColor, NORMAL=normal, DEVICE=device, _EXTRA=extra
ENDIF ELSE BEGIN
PlotS, _x, _y, COLOR=thisColor, NORMAL=normal, DEVICE=device, _EXTRA=extra
ENDELSE
END
ELSE: BEGIN
IF Keyword_Set(fill) THEN BEGIN
PolyFill, _x, _y, z, COLOR=fillColor, NORMAL=normal, DEVICE=device, _EXTRA=extra
PlotS, _x, _y, z, COLOR=thisColor, NORMAL=normal, DEVICE=device, _EXTRA=extra
ENDIF ELSE BEGIN
PlotS, _x, _y, z, COLOR=thisColor, NORMAL=normal, DEVICE=device, _EXTRA=extra
ENDELSE
END
ENDCASE
ENDIF
; Clean up.
cgSetColorState, currentState
IF !D.Name NE 'Z' THEN TVLCT, rr, gg, bb
END
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