\usepackage {pstcol}
\begin{pspicture}(0,0)(3,2)\showgrid
\psdots[linecolor=blue,dotstyle=triangle,
dotscale=2](0,0.5)(1,2)(2.8,1.5)
\pscurve[linecolor=cyan,showpoints=true]
{->}%
(0,1.2)(1.3,1.8)(3,0.4)(0.5,0.2)
\end{pspicture}
Generated by dwww version 1.15 on Sat May 18 05:55:06 CEST 2024.