/* cappello@cs.ucsb.edu
   Peter Cappello
   Sequential Mandelbrot set,
   preparatory for a multiprocessor version
   Uses an array to hold the counts
 */
import java.lang.*;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.awt.image.*;

public class Mandelbrot extends Applet implements ActionListener
{
    Complex ll = new Complex(-2.0, -1.25);

    double  edge = 2.5;   // edge length of square in complex plane
    int     clr = 2,       // bits of R,G,B; lim = 2^(3*clr)
            lgRes = 7,        // resolution: descretize region into 2^exp X 2^exp squares
            lgAtom = 6;     // log of number of squares on a side of an atomic region

    final static int yPO = 40;       // vertical offset: display region below GUI

    Label     resL  = new Label("Resolution"),
              clrL  = new Label("Bits of Red, Green, Blue"),
              atomL = new Label("Atomic size");
    TextField resT  = new TextField("7", 1),
              clrT  = new TextField("2", 4),
              atomT = new TextField("6", 3);

    public void init()
    {
        add(resL);  add(resT);
        add(clrL);  add(clrT);
        add(atomL); add(atomT);
        resT.addActionListener(this);
        clrT.addActionListener(this);
        atomT.addActionListener(this);
    }
    public void actionPerformed(ActionEvent e)
    {
        lgRes  = Integer.parseInt(resT.getText());
        lgAtom = Integer.parseInt(atomT.getText());
        clr = Integer.parseInt(clrT.getText());
        repaint();
    }
    public void paint(Graphics g)
    {
        int res = (int) Math.pow(2,lgRes),// resolution: res x res grid
            lim = (int) Math.pow(2,3*clr),
            atom = (int) Math.pow(2,lgAtom),// size of atomic piece
            counts[][] = new int[res][res];

        // display Mandelbrot set
        int    num = res/atom,                  // num sub-regions
               cnts[][] = new int[atom][atom]; // count array for atom
        double deltaC   = edge/num;  // edge of a sub-region

        Complex deltaRow = new Complex(deltaC,0),
                deltaCol = new Complex(0,deltaC),
                cc;

        MandelbrotSet s;

        for (int j, i = 0; i < num; i++)
        for (       j = 0; j < num; j++)
        {
            cc = new Complex(j*deltaC,i*deltaC);
            cc.add(ll);
            s = new MandelbrotSet(cc, deltaC, atom, clr);
            s.compute();
            s.show(this, g, j*atom, i*atom + yPO);
        }
    }
}