java - drawing arrows on a line defined by a set of points( for tracking) -

I have an instrument that defines a route and I must draw them so that moving a vehicle Direction be pointed. Points can be from curve and I need to attract some arrows. I want to attract the arrow on the path to determine which arrow goes to the vehicle. I have a MapWire Java applet and I should do the last thing, I want to define the arrow on every 10 points on the way.
There is one thing like this:

I will give you Java 2D sizes Let's suggest taking a look: they allow you to define any kind of ... shape and draw them on the given path or you can see