/usr/share/doc/texlive-doc/latex/latex-graphics-companion/4-4-6.inl

\usepackage {pstcol}
\begin{pspicture}(0,0)(4,2)\showgrid
  \psdiamond(1.5,1.5)(1.5,0.5)
  \pstriangle[fillstyle=solid,
              fillcolor=yellow](2,0)(3,1)
\end{pspicture}

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