LACS08_Mandel.java

/**
Mandel.java     MrG     2012.0620
purpose:    plot mandelbrot fractals
required files: Mandel.java     main class
        Complex.java        derived class
        Picture.java        pixel class
translator: javac Mandel.java
        java Mandel xc yc radius dwell pixels
*/
import java.awt.Color;
public class Mandel
{
    public static int limit(Complex z, int dwell)
    {
        Complex z0=z;
        for(int t=0; t<dwell; t++)
        {
            if(z.abs()>2.0)
            {
                return t;
            }
            z=z.prod(z).sum(z0);
        }
        return dwell;
    }

    public static void main(String[] args)
    {
        double xc = Double.parseDouble(args[0]);
        double yc = Double.parseDouble(args[1]);
        double radius = Double.parseDouble(args[2]);
        int dwell = Integer.parseInt(args[3]);
        int pixels = Integer.parseInt(args[4]);

        Color color;
        Picture m = new Picture(pixels,pixels);

        for(int r=0; r<pixels; r++)
        {
            for(int c=0; c<pixels; c++)
            {
                double x=xc-radius/2+radius*r/pixels;
                double y=yc-radius/2+radius*c/pixels;
                Complex z = new Complex(x,y);
                int limit = limit(z,dwell);
                if(limit==dwell)
                {
                    color = new Color(0,0,0);
                }
                else
                {
                    color = new Color((float)(limit)/dwell,0,0);
                }
                System.out.println("limit x y = " + limit + "\t" + x + "\t" + y);
                m.set(r,c,color);
                m.show();
            }
        }
        System.out.println("mag = " + Math.pow(2/radius,2));
    }
}