\documentclass[12pt,a4paper]{article}% Herbert Voss 2004-06-23 \usepackage{pstricks} \usepackage{pst-node} \makeatletter \def\psRotation#1(#2,#3)#4{% \rput{#1}(#2,#3){% \psellipticarc[linewidth=.4pt]{->}(0,-0.1)(0.6,0.15){120}{70} \ifdim#1pt>\z@\rput[l]{*0}(0.675,0){#4}\else\rput[l](0.675,0){#4}\fi }% } \makeatother \begin{document} \psset{unit=2cm} %\psframebox{ \begin{pspicture}(-1.75,-3)(3.25,4) \psline[linewidth=0.25pt](0,0)(0,4) \rput[tl]{0}(0.2,2){$\vec e_z$} \rput[tr]{0}(-0.9,1.4){$\vec e$} \rput[tl]{0}(2.8,-1.1){$\vec C_{ptm{ext}}$} \rput[br]{0}(-0.3,2.1){$\theta$} \rput{25}(0,0){% \psframe[fillstyle=solid,fillcolor=lightgray,linewidth=.8pt](-0.1,-3.2)(0.1,0)} \rput{25}(0,0){% \psellipse[fillstyle=solid,fillcolor=yellow,linewidth=3pt](0,0)(1.5,0.5)} \rput{25}(0,0){% \psframe[fillstyle=solid,fillcolor=lightgray,linewidth=.8pt](-0.1,0)(0.1,3.2)} \rput{25}(0,0){\psline[linecolor=red,linewidth=1.5pt]{->}(0,0)(0.,2)} \psRotation{0}(0,3.5){$\dot\phi$} \psRotation{25}(-1.2,2.6){$\dot\psi$} \psline[linecolor=red,linewidth=1.25pt]{->}(0,0)(0,2) \psline[linecolor=red,linewidth=1.25pt]{->}(0,0)(3,-1) \psline[linecolor=red,linewidth=1.25pt]{->}(0,0)(2.85,-0.95) \psarc{->}{2.1}{90}{112.5} \rput[bl](.1,.01){C} \end{pspicture} %} \end{document}