/**
BodyTester.java     MrG 2012.0621
purpose:    model a single body in space!
required files: BodyTester.java     main class
        Body.java       derived class
        Vector.java     adt class
        StdDraw.java        graphics class
translator: javac BodyTester.java
interpreter:    java BodyTester rx ry vx vy
*/
public class BodyTester
{
    public static void main(String[] args)
    {
        double rx = Double.parseDouble(args[0]);
        double ry = Double.parseDouble(args[1]);
        double vx = Double.parseDouble(args[2]);
        double vy = Double.parseDouble(args[3]);
        Vector pos = new Vector(rx,ry);
        Vector vel = new Vector(vx,vy);
        Body mars = new Body(pos, vel);
        while(true)
        {
            mars.draw();
            mars.move(.01);
            StdDraw.show(50);
        }
    }
}