/usr/share/gnudatalanguage/coyote/cgarrow.pro is in gdl-coyote 2016.11.13-2.
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;
; NAME:
; cgArrow
;
; PURPOSE:
; Provides a device-independent and color-model-independent way of drawing an arrow
; in a specified 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 of drawing an arrow
; in a specified color.
;
; The program requires the `Coyote Library <http://www.idlcoyote.com/documents/programs.php>`
; to be installed on your machine.
;
; :Categories:
; Graphics
;
; :Params:
; x0: in, required, type=integer/float
; The x location of the blunt end of the arrow. May be a vector. Assumes
; device coordinates.
; y0: in, required, type=integer/float
; The y location of the blunt end of the arrow. May be a vector. Assumes
; device coordinates.
; x1: in, required, type=integer/float
; The x location of the sharp end of the arrow. May be a vector. Assumes
; device coordinates.
; y1: in, required, type=integer/float
; The y location of the sharp end of the arrow. May be a vector. Assumes
; device coordinates.
;
; :Keywords:
; addcmd: in, optional, type=boolean, default=0
; An alternative way to set the `Window` keyword.
; clip: in, optional, type=boolean, default=0
; Set the keyword to clip arrow output to the clipping rectangle specified
; in the `CRect` keyword. See the documentation for the IDL graphics
; keyword NOCLIP.
; 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.
; crect: in, optional, type=float
; A four-element array giving the clipping rectangle [xo, yo, x1, y1]. The
; default clipping rectangle is the plot area. See the documenation for the
; IDL graphics keyword CLIP.
; data: in, optional, type=boolean, default=0
; Set this keyword of the arrow locations are in data coordinates.
; Device coordinates are assumed.
; hsize: in, optional, type=float
; The size of the the arrow head. By default 1/64th the width
; of the device. (!D.X_SIZE / 64.)
; hthick: in, optional, type=float, default=1.0
; The thickness of the line drawing the arrowhead.
; linestyle: in, optional, type=integer, default=0
; The line style of the arrow. Line style integers as in PLOT.
; normal: in, optional, type=boolean, default=0
; Set this keyword of the arrow locations are in normalized coordinates.
; Device coordinates are assumed.
; solid: in, optional, type=boolean, default=0
; Set this keyword to draw solid, filled arrows.
; thick: in, optional, type=float, default=1.0
; The thickness of the line drawing the shaft of the arrow.
; window: in, optional, type=boolean, default=0
; Set this keyword to add the command to an cgWindow application.
;
; :Examples:
; Used to draw arrows::
; IDL> cgArrow, 50, 50, 100, 100, /Solid
;
; :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, 23 November 2010. DWF. Based on old Arrow routine in IDL.
; Added Window keyword 24 January 2011. DWF.
; Modified error handler to restore the entry decomposition state if there is an error. 17 March 2011. DWF
; Added the ADDCMD keyword to make the interface more consistent with other Coyote Grapics routines. 18 April 2013. DWF.
; Modified to allow a vector of colors to be added with the COLOR keyword. 23 February 2015. DWF.
; Algorithm modified slightly to get the program a little closer to the machine to speed up
; vector drawing when there are lots of vectors. 23 February 2015. DWF.
;
; :Copyright:
; Copyright (c) 2010-2015, Fanning Software Consulting, Inc.
;-
PRO cgArrow, x0, y0, x1, y1, $
ADDCMD=addcmd, $
CLIP=clipit, $
COLOR = scolor, $
CRECT=crect, $
DATA = data, $
HSIZE = hsize, $
HTHICK = hthick, $
LINESTYLE=linestyle, $
NORMAL = normal, $
SOLID = solid, $
THICK = thick, $
WINDOW=window, $
_REF_EXTRA=extra
Compile_Opt idl2
; Error handling.
Catch, theError
IF theError NE 0 THEN BEGIN
Catch, /CANCEL
void = cgErrorMsg()
IF N_Elements(currentState) NE 0 THEN cgSetColorState, currentState
RETURN
ENDIF
; Use ADDCMD as an alternative way to set the WINDOW keyword.
IF Keyword_Set(addcmd) THEN window = 1
; Should this be added to a resizeable graphics window?
IF Keyword_Set(window) AND ((!D.Flags AND 256) NE 0) THEN BEGIN
void = cgQuery(COUNT=wincnt)
IF wincnt EQ 0 THEN cgWindow
cgWindow, 'cgArrow', x0, y0, x1, y1, $
CLIP=clipit, $
COLOR = scolor, $
CRECT=crect, $
DATA = data, $
HSIZE = hsize, $
HTHICK = hthick, $
LINESTYLE=linestyle, $
NORMAL = normal, $
SOLID = solid, $
THICK = thick, $
ADDCMD=1, $
_EXTRA=extra
RETURN
ENDIF
; Get the current color table vectors.
TVLCT, rr, gg, bb, /Get
; Set up keyword parameters.
IF N_Elements(thick) EQ 0 THEN thick = 1.
IF N_Elements(hthick) EQ 0 THEN hthick = thick
; Strange manipulations to get IDL graphics keyword straight.
noclip = 1 - Keyword_Set(clipit)
IF N_Elements(crect) NE 0 THEN clip =crect
; Choose a color.
IF N_Elements(sColor) EQ 0 THEN BEGIN
IF !D.Name EQ 'PS' THEN BEGIN
sColor = 'OPPOSITE'
ENDIF ELSE BEGIN
IF (!D.Window GE 0) AND ((!D.Flags AND 256) NE 0) THEN BEGIN
pixel = cgSnapshot(!D.X_Size-1, !D.Y_Size-1, 1, 1)
IF (Total(pixel) EQ 765) THEN sColor = 'BLACK'
IF (Total(pixel) EQ 0) THEN sColor = 'WHITE'
IF N_Elements(sColor) EQ 0 THEN sColor = 'OPPOSITE'
ENDIF ELSE sColor = 'OPPOSITE'
ENDELSE
ENDIF
IF N_Elements(sColor) EQ 0 THEN color = !P.Color ELSE color = sColor
IF Size(color, /TYPE) EQ 3 THEN IF cgGetColorState() EQ 0 THEN color = Byte(color)
IF Size(color, /TYPE) LE 2 THEN color = StrTrim(Fix(color),2)
; Make sure colors are using 24-bit values.
cgSetColorState, 1, CURRENT=currentState
IF N_Elements(color) NE N_Elements(x0) $
THEN thisColor = Replicate(cgColor(color), N_Elements(x0)) $
ELSE thisColor = cgColor(color)
; Head size in device units
IF N_Elements(hsize) EQ 0 $
THEN arrowsize = !D.X_Size/50. * (hthick/2. > 1) $
ELSE arrowsize = Float(hsize)
; If arrowsize GT 15, THEN use 20% arrow. Otherwise use 30%.
IF arrowsize LT 15 THEN BEGIN
mcost = -0.866D
sint = 0.500D
msint = -sint
ENDIF ELSE BEGIN
mcost = - 0.939693D
sint = 0.342020D
msint = -sint
ENDELSE
; Process each arrow in the vector.
FOR i = 0L, N_Elements(x0)-1 DO BEGIN
CASE 1 OF
Keyword_Set(data): p = Convert_Coord([x0[i],x1[i]],[y0[i],y1[i]], /DATA, /TO_DEVICE)
Keyword_Set(normal): p = Convert_Coord([x0[i],x1[i]],[y0[i],y1[i]], /NORMAL, /TO_DEVICE)
ELSE: p = [[x0[i], y0[i]],[x1[i], y1[i]]]
ENDCASE
aColor = thisColor[i]
xp0 = p[0,0]
xp1 = p[0,1]
yp0 = p[1,0]
yp1 = p[1,1]
dx = xp1 - xp0
dy = yp1 - yp0
; The length.
zz = SQRT(dx^2d + dy^2d)
IF zz GT 0 THEN BEGIN
dx = dx/zz ; Cos th
dy = dy/zz ; Sin th
ENDIF ELSE BEGIN
dx = 1.
dy = 0.
zz = 1.
ENDELSE
IF arrowsize gt 0 $
THEN a = arrowsize $ ;a = length of head
ELSE a = -zz * arrowsize
xxp0 = xp1 + a * (dx*mcost - dy * msint)
yyp0 = yp1 + a * (dx*msint + dy * mcost)
xxp1 = xp1 + a * (dx*mcost - dy * sint)
yyp1 = yp1 + a * (dx*sint + dy * mcost)
IF Keyword_Set(solid) THEN BEGIN ;Use polyfill?
b = a * mcost*.9d ; End of arrow shaft (Fudge to force join)
Plots, [xp0, xp1+b*dx], [yp0, yp1+b*dy], /DEVICE, $
COLOR=aColor, THICK=thick, LINESTYLE=linestyle, $
NOCLIP=noclip, CLIP=clip, _Extra=extra
Polyfill, [xxp0, xxp1, xp1, xxp0], [yyp0, yyp1, yp1, yyp0], $
/DEVICE, COLOR=aColor, NOCLIP=noclip, CLIP=clip, _Extra=extra
ENDIF ELSE BEGIN
Plots, [xp0, xp1], [yp0, yp1], /DEVICE, COLOR=aColor, THICK=thick, $
LINESTYLE=linestyle, NOCLIP=noclip, CLIP=clip,_Extra=extra
Polyfill, [xxp0,xp1,xxp1],[yyp0,yp1,yyp1], /DEVICE, COLOR=aColor, $
THICK=hthick, LINESTYLE=linestyle, $
NOCLIP=noclip, CLIP=clip,_Extra=extra
ENDELSE
ENDFOR
; Restore color state.
cgSetColorState, currentState
; Restore the input colors.
IF !D.NAME NE 'Z' THEN TVLCT, rr, gg, bb
END
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