Place '>' sign aligned with a piecewise linear curve and mark its vertices using decorations. See the discussion in this thread: http://tex.stackexchange.com/q/144584/412

gistfile1.tex

\begin{tikzpicture}[
  mnode/.style={circle,draw=black,fill=black,inner sep=0pt,minimum size=2pt},
  node at every point/.style={%
    decoration={%
      show path construction,
      lineto code={%
        \coordinate (pos) at ($0.5*(\tikzinputsegmentlast)+0.5*(\tikzinputsegmentfirst)$);
        \coordinate (direction) at ($(\tikzinputsegmentlast)-(\tikzinputsegmentfirst)$);
        \gettikzxy{(direction)}{\dirx}{\diry}
        \pgfmathsetmacro\rotationdir{atan(\diry/\dirx)}
        \node at (pos) [rotate=\rotationdir] {>};
        \node at (\tikzinputsegmentlast) [#1] {};
      },
      moveto code={\node at (\tikzinputsegmentfirst) [#1] {};},
      curveto code={\node at (\tikzinputsegmentlast) [#1] {};}
    },
    postaction=decorate
  }
  ]
  \draw[node at every point=mnode] (0,0) -- (1,2) -- (2.3,0) -- (2.5,1);
\end{tikzpicture}