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+%%%%%%%%%%%%%%%%%%%%%%%%%%%% -*- Mode: Plain-Tex -*- %%%%%%%%%%%%%%%%%%%%%%%%%%
+%% pst-ghsb.tex --- For the PSTricks HSB mode gradient fillstyle
+%%                  Based on pst-grad.tex from Timothy van Zandt
+%%
+%%                  Take care that Hue value is cyclic, so 1=0 !
+%%
+%% Author          : Denis GIROU (CNRS/IDRIS - France) <Denis.Girou@idris.fr>
+%% Created the     : Tue May 13 11:12:36 1997
+%% Last mod. by    : Denis GIROU (CNRS/IDRIS - France) <Denis.Girou@idris.fr>
+%% Last mod. the   : Thu Jan 29 17:20:13 1998
+%% Last mod. by    : Herert Voss <voss _at_ pstricks.de>
+%% Last mod. the   : June 06 2004
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\def\fileversion{1.2}
+\def\filedate{2004/06/23}
+
+%% This program can be redistributed and/or modified under the terms
+%% of the LaTeX Project Public License Distributed from CTAN
+%% archives in directory macros/latex/base/lppl.txt.
+%
+%% This defines a new fill style, "gradient", for use with PSTricks,
+%% which has gradiated color. The following parameters are used:
+%%
+%%    gradbegin=color    : Beginning color.
+%%    gradend=color      : Final color.
+%%    gradlines=int      : Number of lines to use. The higher the number,
+%%                           the slower the rendering.
+%%    gradmidpoint=num   : Gradient color goes from gradbegin to gradend,
+%%                           and then back to beginning. Midpoint (point
+%%                           where "gradend" color appears, is gradmidpoint
+%%                           from the top.  (0 <= Gmidpoint <= 1).
+%%    gradangle=angle    : Rotate image by angle.
+%%    GradientCircle=true : Instead of a linear a circled gradient is build.
+%%                          (version 1.04)
+%%    GradientPos=(x,y) :   the center of the circled gradient
+%%                          (version 1.04)
+%%    GradientScale=float : scaling factor of the circled gradient
+%%                          (version 1.04)
+%%
+
+\message{ v\fileversion, \filedate}
+
+\csname GradientHSBLoaded\endcsname
+\let\GradientHSBLoaded\endinput
+
+\ifx\PSTricksLoaded\endinput\else
+  \def\next{\input pstricks.tex }\expandafter\next
+\fi
+
+\edef\TheAtCode{\the\catcode`\@}
+\catcode`\@=11
+
+\pstheader{pst-ghsb.pro}
+
+\newrgbcolor{gradbegin}{0 .1 .95}
+\def\psset@gradbegin#1{\pst@getcolor{#1}\psgradbegin}
+\psset@gradbegin{gradbegin}
+
+\newrgbcolor{gradend}{0 1 1}
+\def\psset@gradend#1{\pst@getcolor{#1}\psgradend}
+\psset@gradend{gradend}
+
+\def\psset@gradlines#1{%
+  \pst@getint{#1}\psgradlines
+  \ifnum\psgradlines<2
+    \@pstrickserr{gradlines must be at least 2}\@epha
+    \def\psgradlines{2 }%
+  \fi}
+\psset@gradlines{300}
+
+\def\psset@gradmidpoint#1{\pst@checknum{#1}\psgradmidpoint}
+\psset@gradmidpoint{.9}
+
+\def\psset@gradangle#1{\pst@getangle{#1}\psk@gradangle}
+\psset@gradangle{0}
+
+% Herbert Voss 2004-06-23
+% To define the gradient as linear or as circle
+\newif\ifGradientCircle
+\def\psset@GradientCircle#1{\@nameuse{GradientCircle#1}}
+\psset@GradientCircle{false}
+
+% Position of the center of the gradient
+\def\psset@GradientPos#1{\psset@@GradientPos#1}
+\def\psset@@GradientPos(#1){\edef\ps@GradientPos{#1}}
+\psset@GradientPos{(0,0)}
+
+% Scale factor
+\def\psset@GradientScale#1{\edef\ps@GradientScale{#1}}
+\psset@GradientScale{1}
+
+\newif\ifgradientHSB
+\def\psset@gradientHSB#1{\@nameuse{gradientHSB#1}}
+\psset@gradientHSB{false}
+
+\def\psfs@gradient{%
+  \ifgradientHSB
+    \addto@pscode{%
+      gsave
+      gsave \pst@usecolor\psgradbegin currenthsbcolor grestore
+      gsave \pst@usecolor\psgradend currenthsbcolor grestore
+      \psgradlines
+      \psgradmidpoint
+      \psk@gradangle
+%  hv 2004-05-05 begin    fixed a spurious blank
+      tx@GradientHSBDict begin GradientFillHSB end grestore%
+    }%
+%    tx@GradientHSBDict begin GradientFillHSB end grestore}
+%  hv 2004-05-05 end
+  \else%
+%    hv 2004-06-25 begin    fixed a spurious blank
+    \pst@getcoor{\ps@GradientPos}{\pst@tempa}% <- "%"  hv 2004-06-23 
+%    hv end
+    \addto@pscode{%
+      gsave
+      \ifGradientCircle true \else false \fi
+      \ps@GradientScale\space
+      \pst@tempa\space
+      gsave \pst@usecolor\psgradbegin currentrgbcolor grestore
+      gsave \pst@usecolor\psgradend currentrgbcolor grestore
+      \psgradlines
+      \psgradmidpoint
+      \psk@gradangle
+      tx@GradientDict begin GradientFill end grestore%
+    }%
+  \fi%
+}
+
+\catcode`\@=\TheAtCode\relax
+\endinput
+%% END pst-ghsb.tex