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\documentclass{ppex}
\nonstopmode
\usepackage {pstcol,pst-node,pst-coil}
\pagestyle{empty}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {pstcol,pst-node,pst-coil}
\makeatletter
\newdimen\CurX
\newdimen\CurY \newdimen\Cir@temp
\newcount\Cir@direction % 0 right, 1 left, 2 up, 3 down
\Cir@direction0
\def\SetX#1{\CurX=#1pt}
\def\SetY#1{\CurY=#1pt}
\def\ShowDirection{%
\typeout{Direction:
\ifcase\Cir@direction right\or left\or up\or down\fi,
now at (\strip@pt\CurX,\strip@pt\CurY)}%
}
\def\ShowXY{\message{(\strip@pt\CurX,\strip@pt\CurY)}}
\def\Down#1{\advance\CurY by -#1\p@\Cir@direction3%\ShowDirection
}
\def\Up#1{\advance\CurY by #1\p@\Cir@direction2%\ShowDirection
}
\def\Left#1{\advance\CurX by -#1\p@\Cir@direction1%\ShowDirection
}
\def\Right#1{\advance\CurX by #1\p@\Cir@direction0%\ShowDirection
}
\def\MyBox#1#2{% width,height
\pssetlength{\Cir@temp}{#1}%
\rule{\Cir@temp}{\z@}%
\pssetlength{\Cir@temp}{#2}%
\rule{\z@}{\Cir@temp}%
}
\def\Point#1{%
\rput(\strip@pt\CurX,\strip@pt\CurY){\pnode{#1}}%
}
\def\Switch#1{%
\message{[Switch] #1}\ShowXY
\relax
\ifcase\Cir@direction % right
\rput[b](\strip@pt\CurX,\strip@pt\CurY){\rnode[b]{#1}{%
\psline(.5,.4)%
\psarc{<-}{.4}{-10}{70}%
\MyBox{.5}{.4}%
}}%
\advance\CurX by .5\p@
\or % left
\advance\CurX by -.5\p@
\rput[b](\strip@pt\CurX,\strip@pt\CurY){\rnode[b]{#1}{%
\psline(0,0)(.5,.4)%
\psarc{<-}{.4}{-10}{70}%
\MyBox{.5}{.4}%
}}%
\fi
}
\def\Battery#1{%
\message{[Battery] #1}\ShowXY
\relax
\ifcase\Cir@direction % right
\rput[r](\strip@pt\CurX,\strip@pt\CurY){\rnode{#1}{%
\psline(0,-.4)(0,.4)%
\psline(.2,-.2)(.2,.2)%
\MyBox{.2}{.8}%
}}%
\advance\CurX by .2\p@
\or % left
\advance\CurX by -.2\p@
\rput[r](\strip@pt\CurX,\strip@pt\CurY){\rnode{#1}{%
\psline(0,-.4)(0,.4)%
\psline(.2,-.2)(.2,.2)%
\MyBox{.2}{.8}%
}}%
\or % up
\advance\CurY by .2\p@
\rput[b](\strip@pt\CurX,\strip@pt\CurY){\rnode{#1}{%
\psline(.1,.2)(.9,.2)%
\psline(0.3,0)(0.7,0)%
\MyBox{1}{.2}%
}}%
\or % down
\rput[b](\strip@pt\CurX,\strip@pt\CurY){\rnode{#1}{%
\psline(-.4,0)(.4,0)%
\psline(-.2,-.2)(.2,-.2)%
\MyBox{1}{.2}%
}}%
\advance\CurY by -.2\p@
\fi
}
\def\Resistor{\message{[Resistor]}\ShowXY
\@ifnextchar[{\@ResInd}{\@ResInd[1]{pszigzag}}}
\def\Inductor{\message{[Inductor]}\ShowXY
\@ifnextchar[{\@ResInd}{\@ResInd[1]{pscoil}}}
\def\@ResInd[#1]#2#3{%
\ifcase\Cir@direction % right
\rput[l](\strip@pt\CurX,\strip@pt\CurY){\rnode{#3}{%
\csname #2\endcsname[coilarm=.01,coilwidth=.3](0,.15)(#1,.15)%
\MyBox{#1}{.3}%
}}%
\advance\CurX by #1\p@
\or % left
\advance\CurX by -#1\p@
\rput[l](\strip@pt\CurX,\strip@pt\CurY){\rnode{#3}{%
\csname #2\endcsname[coilarm=.01,coilwidth=.3](0,.15)(#1,.15)%
\MyBox{#1}{.3}%
}}%
\or % up
\rput[b](\strip@pt\CurX,\strip@pt\CurY){\rnode{#3}{%
\csname #2\endcsname[coilarm=.01,coilwidth=.3](.15,0)(.15,#1)%
\MyBox{.3}{#1}%
}}%
\advance\CurY by #1\p@
\or % down
\advance\CurY by -#1\p@
\rput[b](\strip@pt\CurX,\strip@pt\CurY){\rnode{#3}{%
\csname #2\endcsname[coilarm=.01,coilwidth=.3](.15,0)(.15,#1)%
\MyBox{.3}{#1}%
}}%
\fi
}
\makeatother
\begin{pspicture}(5,5)
\SetX{1}
\Up{1}
\Battery{A}
\Up{1}
\Right{2}
\Resistor{B}
\Right{1}
\Down{.3}
\Inductor{C}
\Down{.5}
\Left{1}
\Switch{D}
\ncangle[angleA=90,angleB=180,armB=0]{A}{B}
\ncangle[angleA=0,angleB=90,armB=0]{B}{C}
\ncput[ref=l]{~~~$i=i_{\mbox{max}}(1-w^{-t/3})$}
\ncangle[angleA=-90,armB=0,angleB=0]{C}{D}
\ncangle[angleA=180,armB=0,angleB=-90]{D}{A}
\nput{180}{A}{10V}
\nput{90}{B}{R}
\nput{0}{C}{3mH}
\nput{270}{D}{S}
\end{pspicture}
\end{document}
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