<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\input ptb-utils

\_checkloaded{colors}

\def\_rgb_encode#1{#1 rg #1 RG}
\def\_rgb_encodebg#1{#1 rg}
\def\_rgb_encodefg#1{#1 RG}
\def\_cmyk_encode#1{#1 k #1 K}
\def\_cmyk_encodebg#1{#1 k}
\def\_cmyk_encodefg#1{#1 K}

\chardef\_colorstack=0
\def\_pdfcolor_restore{\pdfcolorstack\_colorstack pop\relax}

\def\_setcolor_code#1{\pdfcolorstack\_colorstack push{#1}\aftergroup\_pdfcolor_restore}

%\def\_colorbg_set#1#2{\pdfcolorstack\_colorstack push{\csname _#1_encodebg\endcsname{#2}}\aftergroup\_pdfcolor_restore}
%\def\_colorfg_set#1#2{\pdfcolorstack\_colorstack push{\csname _#1_encodefg\endcsname{#2}}\aftergroup\_pdfcolor_restore}
\def\_color_set#1#2{\_setcolor_code{\csname _#1_encode\endcsname{#2}}}
\def\_colorbg_set#1#2{\_setcolor_code{\csname _#1_encodebg\endcsname{#2}}}
\def\_colorfg_set#1#2{\_setcolor_code{\csname _#1_encodefg\endcsname{#2}}}

\def\_color_defined#1{\expanded{\noexpand\_color_set\csname c@#1\endcsname}}
\def\_colorbg_defined#1{\expanded{\noexpand\_colorbg_set\csname c@#1\endcsname}}
\def\_colorfg_defined#1{\expanded{\noexpand\_colorfg_set\csname c@#1\endcsname}}

%\def\_color_set#1#2{\pdfcolorstack\_colorstack push{\csname _#1_encode\endcsname{#2}}\aftergroup\_pdfcolor_restore}
%   \_color_get_code{rgb/cmyk}{code}{fg/bg/empty}
\def\_color_get_code#1#2#3{\csname _#1_encode#3\endcsname{#2}}
%   \_color_get_defined{color name}{fg/bg/empty}
\def\_color_get_defined#1#2{\expanded{\noexpand\_color_get_code\csname c@#1\endcsname{#2}}}


\def\__getcolorparam#1#2#3#4{%
    \ifx^#3^%
        \_afterfi{\expanded{\unexpanded{#1}{\_color_get_defined{#4}{#2}}}}%
    \else%
        \_afterfi{\expanded{\unexpanded{#1}{\_color_get_code{#3}{#4}{#2}}}}%
    \fi
}
%   \_getcolorparam{\macro}{fg/bg/empty}... (... is of the form rgb{...}, etc, or {color name})
\def\_getcolorparam#1#2#3#{\__getcolorparam{#1}{#2}{#3}}

\def\___setcolor#1#2#3#4\relax{%
    \ifx^#3^%
        \csname _color#1_defined\endcsname{#2}%
    \else%
        \csname _color#1_set\endcsname{#2}{#3}%
    \fi%
}
\def\__setcolor#1#2#{\___setcolor{#1}{#2}}
%   \_setcolor{fg/bg/empty}{color name/color space{...}} -&gt; sets the color
\def\_setcolor#1#2{\expanded{\noexpand\__setcolor{#1}#2}{}\relax}

\def\___getcolor#1#2#3#4;{%
    \ifx^#3^%
        \_color_get_defined{#2}{#1}%
    \else%
        \_color_get_code{#2}{#3}{#1}%
    \fi%
}
\def\__getcolor#1#2#{\___getcolor{#1}{#2}}
%   \_getcolor{fg/bg/empty}{color name/color space{...}} -&gt; gets the color
\def\_getcolor#1#2{\expanded{\noexpand\__getcolor{#1}#2}{};}


%\def\_color#1#2{%
%    \ifx^#1^%
%        \_color_defined{#2}%
%    \else%
%        \_color_set{#1}{#2}%
%    \fi%
%}
\def\color{\_getcolorparam\_setcolor_code{}}

\def\_localcolor#1{%
    \bgroup%
    \_setcolor_code{#1}%
    \let\_regU%
}
\def\localcolor{\_getcolorparam\_localcolor{}}

\def\definecolor#1#2#3{\_xp\def\csname c@#1\endcsname{{#2}{#3}}}
\def\letcolor#1#2{\_xp\edef\csname c@#1\endcsname{\csname c@#2\endcsname}}
\def\definecolormacro#1#2#3{\definecolor{#1}{#2}{#3}\_xp\def\csname #1\endcsname##1{\localcolor{#1}{##1}}}

\newbox\_colorbox
\def\_endhighlightbox{\quitvmode\hbox to\wd\_colorbox{\_xp\localcolor\_regA{\vrule height\ht\_colorbox width\wd\_colorbox depth\dp\_colorbox}\hss\box\_colorbox}\egroup}
\def\_highlightbox#1#2{\bgroup\def\_regA{#1{#2}}\setbox\_colorbox=\hbox\bgroup\aftergroup\_endhighlightbox\let\_regU}
\def\highlightbox#1#{\_highlightbox{#1}}

\def\bufferwidth{2pt}
\def\bufferheight{2pt}
\def\_bufferboxend{\hbox{\kern\bufferwidth\lower\dimexpr\bufferheight + \dp\_colorbox\relax\vbox{\kern\bufferheight\box\_colorbox\kern\bufferheight}\kern\bufferwidth}}
\def\_bufferbox{\setbox\_colorbox=\hbox\bgroup\aftergroup\_bufferboxend\let\_regU}

\def\framewidth{.3pt}
\def\_frameboxend{\hbox{\vrule width\framewidth\lower\dimexpr \framewidth + \dp\_colorbox\relax\vbox{\hrule height\framewidth\box\_colorbox\hrule height\framewidth}\vrule width\framewidth\relax}}
\def\_framebox{\setbox\_colorbox=\hbox\bgroup\aftergroup\_frameboxend\let\_regU}

\def\_coloredbox#1#2{\highlightbox#1{#2}\bgroup\_bufferbox\bgroup\aftergroup\egroup\let\_regU}
\def\coloredbox#1#{\_coloredbox{#1}}

\def\_framecoloredbox#1#2{\quitvmode\_framebox\bgroup\_coloredbox{#1}{#2}\bgroup\aftergroup\egroup\let\_regU}
\def\framecoloredbox#1#{\_framecoloredbox{#1}}

\def\framebox{\_framebox\bgroup\_bufferbox\bgroup\aftergroup\egroup\let\_regU}

\def\_pdf_pt_scale,{.996264 0 0 .996264 0 0 cm}

\def\_curvedbox#1#2#3#4#5{%
    #1 \_nopt{#2pt-#5pt} m
    \_nopt{#1pt-#5pt} \_nopt{#2pt-#5pt} \_nopt{#1pt-#5pt} #2 v
    \_nopt{#1pt-#5pt} \_nopt{#2pt+#4pt} l
    \_nopt{#1pt-#5pt} \_nopt{#2pt+#4pt+#5pt} #1 \_nopt{#2pt+#4pt+#5pt} v
    \_nopt{#1pt+#3pt} \_nopt{#2pt+#4pt+#5pt} l
    \_nopt{#1pt+#3pt+#5pt} \_nopt{#2pt+#4pt+#5pt} \_nopt{#1pt+#3pt+#5pt} \_nopt{#2pt+#4pt} v
    \_nopt{#1pt+#3pt+#5pt} #2 l
    \_nopt{#1pt+#3pt+#5pt} \_nopt{#2pt-#5pt} \_nopt{#1pt+#3pt} \_nopt{#2pt-#5pt} v
    #1 \_nopt{#2pt-#5pt} l
}

\def\_blcorner#1#2#3#4#5#6#7#8#9{%
    \if.#9
        \_nopt{#5} \_nopt{#2} m
    \else
        \_nopt{#8} \_nopt{#2} m
    \fi
    \if-#7
        \if.#6
            #1 \_nopt{#2} l
            \_nopt{#3} \_nopt{#2} \_nopt{#3} #4 v
        \else
            \_nopt{#3} \_nopt{#2} l
        \fi
    \else
        #1 \_nopt{#2} m
        \if.#6
            #1 \_nopt{#2} l
            \_nopt{#3} \_nopt{#2} \_nopt{#3} #4 v
        \else
            \_nopt{#3} \_nopt{#2} m
        \fi
    \fi
}

\def\_tlcorner#1#2#3#4#5#6{%
    \if-#6
        \if.#5
            \_nopt{#1} \_nopt{#2} l
            \_nopt{#1} \_nopt{#3} #4 \_nopt{#3} v
        \else
            \_nopt{#1} \_nopt{#3} l
        \fi
    \else
        \if.#5
            \_nopt{#1} \_nopt{#2} m
            \_nopt{#1} \_nopt{#3} #4 \_nopt{#3} v
        \else
            \_nopt{#1} \_nopt{#3} m
        \fi
    \fi
}

\def\_trcorner#1#2#3#4#5#6{%
    \if-#6
        \if.#5
            \_nopt{#1} \_nopt{#2} l
            \_nopt{#3} \_nopt{#2} \_nopt{#3} \_nopt{#4} v
        \else
            \_nopt{#3} \_nopt{#2} l
        \fi
    \else
        \if.#5
            \_nopt{#1} \_nopt{#2} m
            \_nopt{#3} \_nopt{#2} \_nopt{#3} \_nopt{#4} v
        \else
            \_nopt{#3} \_nopt{#2} m
        \fi
    \fi
}

\def\_brcorner#1#2#3#4#5#6{%
    \if-#6
        \if.#5
            \_nopt{#1} #2 l
            \_nopt{#1} \_nopt{#3} \_nopt{#4} \_nopt{#3} v
        \else
            \_nopt{#1} \_nopt{#3} l
        \fi
    \else
        \if.#5
            \_nopt{#1} #2 m
            \_nopt{#1} \_nopt{#3} \_nopt{#4} \_nopt{#3} v
        \else
            \_nopt{#1} \_nopt{#3} m
        \fi
    \fi
}

%   #1: origin x
%   #2: origin y
%   #3: width
%   #4: height
%   #5: curvature
%   Note: #1...#4 do not take curvature into account
\def\_curvedbox#1#2#3#4#5#6#7#8#9{%
    \if.#6
        #1 \_nopt{#2pt-#5pt} m
        \_nopt{#1pt-#5pt} \_nopt{#2pt-#5pt} \_nopt{#1pt-#5pt} #2 v
    \else
        \_nopt{#1pt-#5pt} \_nopt{#2pt-#5pt} m
    \fi
    \if.#7
        \_nopt{#1pt-#5pt} \_nopt{#2pt+#4pt} l
        \_nopt{#1pt-#5pt} \_nopt{#2pt+#4pt+#5pt} #1 \_nopt{#2pt+#4pt+#5pt} v
    \else
        \_nopt{#1pt-#5pt} \_nopt{#2pt+#4pt+#5pt} l
    \fi
    \if.#8
        \_nopt{#1pt+#3pt} \_nopt{#2pt+#4pt+#5pt} l
        \_nopt{#1pt+#3pt+#5pt} \_nopt{#2pt+#4pt+#5pt} \_nopt{#1pt+#3pt+#5pt} \_nopt{#2pt+#4pt} v
    \else
        \_nopt{#1pt+#3pt+#5pt} \_nopt{#2pt+#4pt+#5pt} l
    \fi
    \if.#9
        \_nopt{#1pt+#3pt+#5pt} #2 l
        \_nopt{#1pt+#3pt+#5pt} \_nopt{#2pt-#5pt} \_nopt{#1pt+#3pt} \_nopt{#2pt-#5pt} v
    \else
        \_nopt{#1pt+#3pt+#5pt} \_nopt{#2pt-#5pt} l
    \fi
    %#1 \_nopt{#2pt-#5pt} l
}

\def\_curvedbox#1#2#3#4#5{%
    \_blcorner{#1}{#2pt-#5pt}{#1pt-#5pt}{#2}{#1pt+#3pt}\_dotbl\_lineb{#1pt+#3pt+#5pt}\_dotbr\_space
    \_tlcorner{#1pt-#5pt}{#2pt+#4pt}{#2pt+#4pt+#5pt}{#1}\_dottl\_linel\_space
    \_trcorner{#1pt+#3pt}{#2pt+#4pt+#5pt}{#1pt+#3pt+#5pt}{#2pt+#4pt}\_dottr\_linet\_space
    \_brcorner{#1pt+#3pt+#5pt}{#2}{#2pt-#5pt}{#1pt+#3pt}\_dotbr\_liner\_space
}

\def\_curvedboxbg#1#2#3#4#5{%
    \_blcorner{#1}{#2pt-#5pt}{#1pt-#5pt}{#2}{#1pt+#3pt}\_dotbl-{#1pt+#3pt+#5pt}\_dotbr\_space
    \_tlcorner{#1pt-#5pt}{#2pt+#4pt}{#2pt+#4pt+#5pt}{#1}\_dottl-\_space
    \_trcorner{#1pt+#3pt}{#2pt+#4pt+#5pt}{#1pt+#3pt+#5pt}{#2pt+#4pt}\_dottr-\_space
    \_brcorner{#1pt+#3pt+#5pt}{#2}{#2pt-#5pt}{#1pt+#3pt}\_dotbr-\_space
}


\def\_getdotsnlines#1#2#3#4#5#6#7#8\_nul{%
    \edef\_lineb{#1}%
    \edef\_dotbl{#2}%
    \edef\_linel{#3}%
    \edef\_dottl{#4}%
    \edef\_linet{#5}%
    \edef\_dottr{#6}%
    \edef\_liner{#7}%
    \edef\_dotbr{#8}%
}

\def\curvebuffer{4pt}
\def\curvewidth{1pt}
\def\_actual_curve_buf{\dimexpr\curvebuffer + \curvewidth\relax}
\def\boxshadowcolor{rgb{.9 .9 .9}}
\def\shadowxoff{3pt}
\def\shadowyoff{-3pt}

\long\def\curvedcolorbox#1#2#3#4{{%
    \_xp\_getdotsnlines\expanded{#4}\_nul%
    \setbox\_colorbox=\hbox{{#3}}%
    \hbox{%
        \lower\dimexpr\curvebuffer + \curvewidth + \dp\_colorbox\relax%
        \vbox{%
            \kern\_actual_curve_buf%
            \hbox{%
                \kern\_actual_curve_buf%
                \pdfliteral{%
                    q \_pdf_pt_scale,
                    \_getcolor{}{\boxshadowcolor}
                    \_nopt{\curvewidth} w
                    \_curvedboxbg{\_nopt{\shadowxoff}}{\_nopt{-\dp\_colorbox+\shadowyoff}}{\_nopt{\wd\_colorbox}}{\_nopt{\ht\_colorbox+\dp\_colorbox}}{\_nopt{\curvebuffer}}\_space%#4
                    b
                    \_getcolor{bg}{#2}
                    \_getcolor{fg}{#1}
                    \_curvedboxbg{0}{\_nopt{-\dp\_colorbox}}{\_nopt{\wd\_colorbox}}{\_nopt{\ht\_colorbox+\dp\_colorbox}}{\_nopt{\curvebuffer}}\_space%#4
                    W f
                }%
                \rlap{\copy\_colorbox}%
                \pdfliteral{%
                    Q
                    q
                    \_pdf_pt_scale,
                    \_nopt{\curvewidth} w
                    \_getcolor{fg}{#1}
                    \_curvedbox{0}{\_nopt{-\dp\_colorbox}}{\_nopt{\wd\_colorbox}}{\_nopt{\ht\_colorbox+\dp\_colorbox}}{\_nopt{\curvebuffer}}\_space%#4
                    S
                    Q
                }%
                \kern\wd\_colorbox%
                \kern\_actual_curve_buf%
            }%
            \kern\_actual_curve_buf%
        }%
    }%
}}

\def\_pagecolor#1{\pdfliteral page{#1 0 0 \_nopt{\pdfpagewidth} \_nopt{\pdfpageheight} re f}}
\def\pagecolor{\_getcolorparam\_pagecolor{}}

\def\pageborder#1#2#3{%
    \pdfliteral page{%
        q
        \_pdf_pt_scale,
        \_getcolor{bg}{#1} \_getcolor{fg}{#2}
        #3 w
        0 0 \_nopt{\pdfpagewidth} \_nopt{\pdfpageheight} re b
        Q
    }%
}

\def\fakeboldwidth{.4}
\long\def\_fakebold[#1]#2{\pdfliteral{2 Tr #1 w}#2\pdfliteral{0 Tr}}
\def\fakebold{\_ifnextchar[ {\_fakebold}{\_fakebold[\fakeboldwidth]}}
\def\flip#1{{\setbox0=\hbox{#1}\kern\wd0\pdfsave\pdfliteral{-1 0 0 1 0 0 cm}\rlap{#1}\pdfrestore}}

\definecolormacro{red}{rgb}{1 0 0}
\definecolormacro{blue}{rgb}{0 0 1}
\definecolormacro{green}{rgb}{0 1 0}
\definecolormacro{yellow}{rgb}{1 1 0}
\definecolormacro{orange}{rgb}{1 .4 0}
\definecolormacro{purple}{rgb}{1 0 1}
\definecolormacro{white}{rgb}{1 1 1}
\definecolormacro{black}{rgb}{0 0 0}
\definecolormacro{darkgreen}{rgb}{0 .7 0}
\definecolormacro{grey}{rgb}{.5 .5 .5}

</pre></body></html>