white blue red green yellow magenta cyan darkgrey darkgray darkblue darkred darkgreen darkyellow darkmagenta darkcyan gold lightgrey lightgray lightblue lightred lightgreen lightyellow lightmagenta lightcyan lilac turquoise aquamarine khaki purple yellowgreen pink orange orchid black box triangle circle ellipse hexagon rhomb rhomboid trapeze uptrapeze trapezoid uptrapezoid lparallelogram rparallelogram unfolded folded boxed clustered wrapped exclusive white normal tree forcedir dfs minbackward maxdepth maxdepthslow mindepth mindepthslow minindegree minoutdegree maxindegree maxoutdegree maxdegree mindegree attraction repulsion randomfactor randomimpulse randomrounds tempscheme temptreshold tempmin tempmax no polar circular polcircular orthogonal toptobottom bottomtotop lefttoright righttoleft top_to_bottom bottom_to_top left_to_right right_to_left solid continuous dashed dotted double triple invisible pfish cfish fpfish fcfish dpfish dcfish