LACS06_DrunkTurtle.java

/**
DrunkTurtle.java    MrG 2012.0605
purpose:    simulate a random walk
required:   DrunkTurtle.java        main class
        Turtle.java         derived class
        StdDraw.java            graphics class
translator: javac DrunkTurtle.java
interpreter:    java DrunkTurtle A N S
*/
public class DrunkTurtle
{
    public static void main(String[] args)
    {
        int A = Integer.parseInt(args[0]);      //angle
        int N = Integer.parseInt(args[1]);      //num steps
        double S = Double.parseDouble(args[2]);     //step size
        int choices = 360/A;
        Turtle drunk = new Turtle(0.5,0.5,0);
        for(int i = 0; i<N; i++)
        {
            double turn=Math.random();
            if(turn<0.5)
            {
                double left=Math.random();
                if(left<0.5)
                {
                    drunk.turnLeft(A*(int)(choices*Math.random()));
                }
                else
                {
                    drunk.turnLeft(-A*(int)(choices*Math.random()));
                }
            }
            else
            {
                drunk.goForward(S);
            }
        }
    }
}