Mandelbrot.java in pgm

Mandelbrot.java

import java.awt.Color;

public class Mandelbrot

    {

        public static int mand(Complex z0, int max)

    {

        Complex z = z0;

        for (int t = 0; t < max; t++)

       {

            if (z.abs() > 2.0) return t;

            z = z.times(z).plus(z0);

        }

        return max;

    }

    public static void main(String[] args) 

   {

        double xc   = Double.parseDouble(args[0]);

        double yc   = Double.parseDouble(args[1]);

        double size = Double.parseDouble(args[2]);

        int N   = 512;  

        int max = 255;  

        Picture pic = new Picture(N, N);

        for (int i = 0; i < N; i++)

        {

            for (int j = 0; j < N; j++)

        {

                double x0 = xc - size/2 + size*i/N;

                double y0 = yc - size/2 + size*j/N;

                Complex z0 = new Complex(x0, y0);

                int gray = max - mand(z0, max);

                Color color = new Color(gray, gray, gray);

                pic.set(i, N-1-j, color);

            }

        }

        pic.show();

    }

}