在一组点定义的线上绘制箭头（用于跟踪）

Question

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.
A thing like this: alt text http://img517.yfrog.com/img517/7690/schermafbeelding2010032.png

Answer 1

I would suggest you to take a look at Java2D shapes :they allow you to define any kind of ... well ... shape and draw them on a given path. You can take a look at this tutorial or at Sun tutorial .

Answer 2

In addition to what Riduidel said you should also try to get the angle that results from the intersection of the line with OX. Using that angle you could calculate a transformation matrix to draw the arraws neatly aligned to the line.

Answer 3

Pete Kirkham在几个月前的《 如何在Java中绘制有向箭头》中发布了一个完整的工作示例 。