title: drawing arrows on a line defined by a set of points( for tracking)
body: <blockquote>
    <p>I have a set of points which define a route 
     and I must draw them so a vehicle's moving direction is denoted.
     The points may be from a curve and I need to draw some arrows.
     I want to draw arrows on the route to define which arrow vehicle goes.
    I have a mapviewr java applet and the last I must do is this work, I want to define arrows on every 10 points on the route.<br>
    A thing like this:
    <a href="http://img517.yfrog.com/img517/7690/schermafbeelding2010032.png" rel="nofollow noreferrer">alt text http://img517.yfrog.com/img517/7690/schermafbeelding2010032.png</a></p>
  </blockquote>