%% $Id: pst-hsb.tex 686 2023-04-02 13:03:12Z herbert $
%%
%% This is file `pst-hsb.tex',
%%
%% IMPORTANT NOTICE:
%%
%% Package `pst-hsb.tex'
%%
%% Denis Girou
%% Manuel Luque
%% Herbert Voss <hvoss@tug.org>
%%
%% 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.
%%
%% DESCRIPTION:
%%   `pst-hsb' is a PSTricks package for continous color
%%
%%
\csname PSThsbLoaded\endcsname
\let\PSThsbLoaded\endinput

\ifx\PSTricksLoaded\endinput\else\input pstricks.tex\fi
\ifx\PSTplotLoaded\endinput\else \input pst-plot \fi
\ifx\PSTXKeyLoaded\endinput\else \input pst-xkey.tex \fi
%
\edef\PstAtCode{\the\catcode`\@} \catcode`\@=11\relax
% interface to the `xkeyval' package
\pst@addfams{pst-hsb}
%
\def\fileversion{0.03}
\def\filedate{2023/04/02}
\message{`PST-hsb' v\fileversion, \filedate\space (hv)}
%
\define@key[psset]{pst-hsb}{HueBegin}{\def\psHSB@HueBegin{#1}}% 0..1    H
\define@key[psset]{pst-hsb}{HueEnd}{\def\psHSB@HueEnd{#1}}%     0..1    H
\define@key[psset]{pst-hsb}{SaturationBegin}{\def\psHSB@SaturationBegin{#1}}% 0..1   S
\define@key[psset]{pst-hsb}{SaturationEnd}{\def\psHSB@SaturationEnd{#1}}%     0..1   S
\define@key[psset]{pst-hsb}{BrightnessBegin}{\def\psHSB@BrightnessBegin{#1}}% 0..1   B
\define@key[psset]{pst-hsb}{BrightnessEnd}{\def\psHSB@BrightnessEnd{#1}}%     0..1   B
\define@key[psset]{pst-hsb}{ColorBegin}{\pst@getcolor{#1}\ps@ColorBegin}
\define@key[psset]{pst-hsb}{ColorEnd}{\pst@getcolor{#1}\ps@ColorEnd} 
\define@boolkey[psset]{pst-hsb}[Pst@]{HSB}[true]{}
% Default values
\psset[pst-hsb]{
  HueBegin=0,HueEnd=1,
  SaturationBegin=1, SaturationEnd=1,
  BrightnessBegin=1, BrightnessEnd=1, 
  HSB=true,ColorBegin=white,ColorEnd=black}
\psset{dimen=outer,variableColor=false}
 
\def\psparametricplotHSB{\pst@object{psparametricplotHSB}}
\def\psparametricplotHSB@i#1#2#3{{%
  \begin@ClosedObj
  \addto@pscode{%
    /t #1 def
    /dt #2 t sub \psk@plotpoints\space div def
    /t t dt sub def
    /F@pstplot 
      \ifPst@algebraic (#3)
         \ifx\psk@PlotDerivative\@none\else
           \psk@PlotDerivative\space { (t) tx@Derive begin Derive end } repeat
         \fi
         tx@AlgToPs begin AlgToPs end cvx
      \else 
         { #3 } 
      \fi  
    def
    /Counter 0 def
    1 setlinejoin
    \psk@plotpoints {
      /t t dt add def
      /Counter Counter 1 add def
      t F@pstplot
      \pst@number\psyunit mul exch
      \pst@number\psxunit mul exch
      1 Counter eq { moveto currentpoint /OldY ED /OldX ED } % First point
        {\ifPst@HSB % Other points than the first one
          /PointY exch def
          /PointX exch def
          Counter \psk@plotpoints\space div /Factor ED
          \psHSB@HueEnd\space
          \psHSB@HueBegin\space sub               % HueEnd-HueBegin
          dup 0 eq { pop \psHSB@HueBegin\space }
                   { Factor mul \psHSB@HueBegin\space add } ifelse
          /H_hsb ED 
          \psHSB@SaturationEnd\space
          \psHSB@SaturationBegin\space sub 
          dup 0 eq { pop \psHSB@SaturationBegin\space }
                   { Factor mul \psHSB@SaturationBegin\space add } ifelse 
          /S_hsb ED 
          \psHSB@BrightnessEnd\space
          \psHSB@BrightnessBegin\space sub
          dup 0 eq { pop \psHSB@BrightnessBegin\space }
                   { Factor mul \psHSB@BrightnessBegin\space add } ifelse
          /B_hsb ED
          H_hsb S_hsb B_hsb sethsbcolor    % H S B was on stack
          OldX OldY PointX PointY lineto lineto 
          stroke
          PointX PointY moveto
          /OldX PointX def /OldY PointY def
        \else lineto \fi } ifelse
     } repeat }% fin du code ps
   \end@ClosedObj
   }\ignorespaces} 
%
\def\pslineHSB{\pst@object{pslineHSB}}
\def\pslineHSB@i(#1)(#2){{%
  \begin@OpenObj
  \pst@getcoor{#1}\pst@tempA
  \pst@getcoor{#2}\pst@tempB
%  \typeout{\psHSB@HueEnd~
%          \psHSB@HueBegin~
%          \psHSB@SaturationBegin~
%          \psHSB@SaturationEnd~
%          \psHSB@BrightnessBegin~
%          \psHSB@BrightnessEnd}%
  \addto@pscode{%
    \pst@tempA 
    /y0 ED /x0 ED
    \pst@tempB 
    /y1 ED /x1 ED
    /dx x1 x0 sub \psk@plotpoints\space div def
    /m y1 y0 sub x1 x0 sub div def
    /t x0 dx sub def
    /Counter 0 def
    \ifPst@variableColor
      /startWave 
      lambda dColor add dup /lambda ED 
      tx@addDict begin wavelengthToRGB Red Green Blue end setrgbcolor
    \fi
    gsave
    x0 y0 translate
    \psk@plotpoints {
      /t t dx add def
      /Counter Counter 1 add def
      t dup m mul
      1 Counter eq 
        { moveto currentpoint /OldY ED /OldX ED } % First point
        {\ifPst@HSB                               % Other points than the first one
          /PointY exch def
          /PointX exch def
          Counter \psk@plotpoints\space div /Factor ED
          \psHSB@HueEnd\space
          \psHSB@HueBegin\space sub               % HueEnd-HueBegin
          dup 0 eq { pop \psHSB@HueBegin\space }
                   { Factor mul \psHSB@HueBegin\space add } ifelse
          /H_hsb ED 
          \psHSB@SaturationEnd\space
          \psHSB@SaturationBegin\space sub 
          dup 0 eq { pop \psHSB@SaturationBegin\space }
                   { Factor mul \psHSB@SaturationBegin\space add } ifelse 
          /S_hsb ED 
          \psHSB@BrightnessEnd\space
          \psHSB@BrightnessBegin\space sub
          dup 0 eq { pop \psHSB@BrightnessBegin\space }
                   { Factor mul \psHSB@BrightnessBegin\space add } ifelse
          /B_hsb ED
          H_hsb S_hsb B_hsb sethsbcolor    % H S B was on stack
          OldX OldY PointX PointY lineto lineto 
          stroke
          PointX PointY moveto
          /OldX PointX def /OldY PointY def
         \else 
           \ifPst@variableColor
           \else
             lineto 
           \fi
         \fi 
       } ifelse
     } repeat 
     grestore
   }%
   \end@OpenObj
   }\ignorespaces} 
\catcode`\@=\TheAtCode\relax
%
\endinput
%%
%% END pst-hsb.tex