/*Mandel.java - Java Mandelbrot by MN Karthik. 
Any questions, comments, suggestions? You can contact me at mnkarthik@yahoo.com.
*/
import java.awt.Graphics;
import java.awt.Color;

public class Mandel extends java.applet.Applet {

    public void paint(Graphics g) {
  int sx=320;           //Screenwidth
  int sy=240;           //Screenheight
  double xmin=-2;       //smallest real value (x-axis)
  double xmax=1.25;     //largest real value (x-axis)
  double ymin=-1.25;    //smallest imaginary value (y-axis)
  double ymax=1.25;     //largest imaginary value (y-axis)
  double maxiter=512;       //Max number of iterations

  double old_x;         //temporary variable to store x-value
  double fx,fy;        
  int m;                //variable to store number of iterations

  double dx=(xmax-xmin)/sx; //how much to add for each x-pixel?
  double dy=(ymax-ymin)/sy; //how much to add for each y-pixel?

  int px;               //Variable storing current x-pixel
  int py=0;             //Variable storing current y-pixel
  double x;             //Variable storing current x-value
  double y=ymin;        //Variable storing current y-value

 g.setColor(Color.black);
 g.drawString("Rendering Mandelbrot..... please wait", 72, 220);
  while (py<sy) {
	 px=0;
	 x=xmin;
	 py++;
	 while (px<sx) {
		px++;

		fx=0;           
		fy=0;
		m=0;            
		do {
		  old_x=fx;      
		  fx=fx*fx-fy*fy+x;   
		  fy=2*old_x*fy+y;  
		  m++;                
		} while (((fx*fx+fy*fy)<4) && (m<maxiter)); 
	    if (m%2==0) g.setColor(Color.white);
	    if (m%3==0) g.setColor(Color.green);
	    if (m%4==0) g.setColor(Color.blue);
	    if (m%5==0) g.setColor(Color.red);
	    if (m%6==0) g.setColor(Color.yellow);
	    if (m%7==0) g.setColor(Color.cyan);
	    if (m%8==0) g.setColor(Color.magenta);
	    if (m%9==0) g.setColor(Color.orange);
	    if (m%10==0) g.setColor(Color.pink);
	    if (m%11==0) g.setColor(Color.gray);
	    if (m%12==0) g.setColor(Color.red);
	    if (m%13==0) g.setColor(Color.black);	g.drawLine(px-3,py-3,px+10,py+10);	 //the +10 adds a nice effect while rendering :)
	 x+=dx;
	 }
  y+=dy;
  }
  g.setColor(Color.black);
  g.drawString("Java Mandelbrot By MN Karthik", 3, 10);
    }
  public String getAppletInfo() {
    return "Java Mandelbrot by MN Karthik (mnkarthik@yahoo.com)";
  }
}