//Mapplet is an applet for Mandlebrot
  
  import java.awt.event.MouseListener;
  import java.awt.event.MouseEvent; 
    
  import java.awt.*;
  import java.awt.event.*; 



  import java.applet.Applet; 
  import java.awt.Graphics;
  public class Mapplet extends Applet implements MouseListener { 
 
  StringBuffer buffer;
  double xCurser;
  double yCurser;
  int imax;
  int jmax;
  double aspectRatio; 
  double xcenter;
  double ycenter;
  double xstart;
  double ystart;
  double xincrement;
  double yincrement;
 
  double zoom;
  static int BUTTON1_MASK;
  
    public void init() {
    addMouseListener(this); 
    zoom=1.0;
    xcenter=0.0;
    ycenter=0.0;
    imax=300;
    jmax=300;
    aspectRatio=((double)jmax)/((double) imax);

 


    buffer = new StringBuffer(); 
   // addItem("initializing... "); 
   } 
    public void start() {
     // addItem("starting... "); 
   }
  public void stop() {
     // addItem("stopping... ");  
   }
    public void destroy() { 
      //  addItem("preparing for unloading..."); 
    } 
 
  

 
   
  public void mouseEntered(MouseEvent event) { } 
  public void mouseExited(MouseEvent event) { }
  public void mousePressed(MouseEvent event) { }  
  public void mouseReleased(MouseEvent event) { } 
  public void mouseClicked(MouseEvent event) {
      // addItem("click!...");
      if( (event.getModifiers() & event.BUTTON3_MASK)==
           event.BUTTON3_MASK ){
                System.out.println("right button pressed");
                zoom=zoom*2.0;
       }
       if( (event.getModifiers() & event.BUTTON1_MASK)==
           event.BUTTON1_MASK ){
                System.out.println("left button pressed");
                zoom=zoom*0.5;
       }

       xCurser=event.getX();
       yCurser=event.getY();
       xcenter=xstart+xCurser*xincrement;
       ycenter=ystart-yCurser*yincrement;
       System.out.println("xcenter=" + xcenter + "ycenter=" +
             ycenter);
       System.out.println("zoom=" + zoom);
       repaint();       
   } 
  public void paint(Graphics g) {
         g.setColor(Color.black);
         g.fillRect(0,0,imax,jmax);
        

        double thresh=0.0001;
      
        double x,y;
        
        
     
                        
       
        xstart=xcenter-zoom;
        ystart=ycenter+zoom*aspectRatio;
        
        xincrement=2.0*zoom/((double)imax);
        yincrement=xincrement*aspectRatio;

       
          int kmax=50;
        int k;
       
        
        Complex z;
        Complex c;
       
        

	
        
	for (int i=1;i<imax;i++){
           for (int j=1;j<jmax;j++){
                k=0;
                                   
       
       

              //  x=-1.0+0.005*i;
              //  y=-1.0+0.005*j;
                x=xstart+xincrement*i;
                y=ystart-yincrement*j;
                c=new Complex(x,y);
                z=new Complex(0.0,0.0);

                
                while (z.Magnitude()<2.0 && k<kmax){
                   z=z.Times(z);
                   z=z.Plus(c); 
                   k++;
                }
//System.out.println("i="+i+"  j="+j+"k="+k);
                if(k<=kmax){
                   if(k<=5){
                      g.setColor(Color.red);
                      g.drawRect(i,j,1,1);
                   }   
                   else if((k>5)&&(k<=10)){
                      g.setColor(Color.orange);
                      g.drawRect(i,j,1,1);
                   }
                   else if((k>10)&&(k<=15)){
                      g.setColor(Color.yellow);
                      g.drawRect(i,j,1,1);
                   }
                   else if((k>15)&&(k<=20)){
                      g.setColor(Color.green);
                      g.drawRect(i,j,1,1);
                   }
                   else if((k>20)&&(k<=25)){
                      g.setColor(Color.blue);
                      g.drawRect(i,j,1,1);
                   }
                   else if((k>25)&&(k<=30)){
                      g.setColor(Color.cyan);
                      g.drawRect(i,j,1,1);
                   }
                   else if((k>30)&&(k<=35)){
                      g.setColor(Color.magenta);
                      g.drawRect(i,j,1,1);
                   }
                   else if((k>35)&&(k<=40)){
                      g.setColor(Color.gray);
                      g.drawRect(i,j,1,1);
                   }
                   else if((k>40)&&(k<45)){
                      g.setColor(Color.darkGray);
                      g.drawRect(i,j,1,1);                                                      }
                   else if((k>45)&&(k<50)){
                      g.setColor(Color.black);
                      g.drawRect(i,j,1,1);
                   }
               } // end of if(k<=kmax)
               if(k>=kmax){
                  g.setColor(Color.black);
                  g.drawRect(i,j,1,1);
               }
           } //end for loop       
      }//end for loop 
   }// end of "public void paint(Graphics g)"
                
  } //end of applet