// "Shrimps hunter",  Evgeny Demidov,  17 June 04

import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.util.StringTokenizer;

public class @file extends java.applet.Applet implements MouseListener {
double maxIZI2=10., Ymid=.0, Xmid=-.5, DelX=3.,  paramC,paramD;
int MaxIt = 256,  maxColor = 96, w, h, pixArr[];
Image img;             IndexColorModel RainbowColor;
long generTime;        boolean   showXY = true;
FormulaD formD;        TextField tfXY;

public void init() {
  String s=getParameter("XYmidDelCD"); if (s != null) {
    StringTokenizer st = new StringTokenizer(s);
    Xmid = Double.valueOf(st.nextToken()).doubleValue();
    Ymid = Double.valueOf(st.nextToken()).doubleValue();
    DelX = Double.valueOf(st.nextToken()).doubleValue();
    paramC = Double.valueOf(st.nextToken()).doubleValue();
    paramD = Double.valueOf(st.nextToken()).doubleValue();}
  s=getParameter("MaxIt"); if (s != null) MaxIt=Integer.parseInt(s);
  s=getParameter("MaxIZI2");
  if (s != null) maxIZI2 = Double.valueOf(s).doubleValue();
  s=getParameter("MaxColor"); if (s != null) maxColor=Integer.parseInt(s);
  int M=maxColor/3,  M2=2*M;  maxColor = 3*M;     // maxColor is 3*int
  long M4 = (long)M*M*M*M;
  byte rColor[] = new byte[maxColor+2], bColor[] = new byte[maxColor+2],
       gColor[] = new byte[maxColor+2];
  for (int i = 1; i < M2; i++){                   // set Color Map
    long dum = M - i;  dum *=dum;  dum *=dum;
    gColor[i] =  bColor[(i+M) % maxColor] = rColor[(i+M2) % maxColor] =
        (byte)(255 - (255*dum)/M4);}
  rColor[maxColor+1] = gColor[maxColor+1] = bColor[maxColor+1] = (byte)200;
  RainbowColor = new IndexColorModel( 8, maxColor+2, rColor,gColor,bColor);
  w = getSize().width;   h = getSize().height;
  s=getParameter("showXY");
  if ( (s != null) && (s.equalsIgnoreCase("N")) ) showXY = false;
  else{
    setLayout(new BorderLayout());
    s = ""+Xmid+", "+Ymid+"; "+(float)DelX;
    tfXY = new TextField( s );
    add("South",  tfXY);
    h -= tfXY.getPreferredSize().height;}
  pixArr = new int[w*(h+2)];
  s=getParameter("Formula");
  if (s != null)
    try{  formD = (FormulaD)Class.forName( s ).newInstance();
    }catch(Exception e){}
  else  formD = new HenonH();
  Draw(Xmid, Ymid, DelX/w, formD, paramC, paramD );
  addMouseListener(this);
}

public void destroy() {  removeMouseListener(this); }
public void mouseClicked(MouseEvent e) {}      //1.1 event handling
public void mousePressed(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent  e) {}

public void mouseReleased(MouseEvent e) {
  double Xo = Xmid+(e.getX()-w/2)*DelX/w,
         Yo = Ymid-(e.getY()-h/2)*DelX/w;
  if ( !(e.isAltDown() || e.isControlDown()) ){
    int p = formD.iterate(Xo, Yo, paramC, paramD, maxIZI2, MaxIt, maxColor)+1;
    if (showXY) tfXY.setText( "p="+p+"   "+(float)Xo+", "+(float)Yo);
//    repaint();
    return;}
  Xmid = Xo;  Ymid = Yo;
  if ( e.isControlDown() ) {
    if ( e.isShiftDown() )  DelX *=4.;  else  DelX *=2.;}
  else {
    if ( e.isShiftDown() )  DelX /=4.;  else  DelX /=2.;}
  Draw(Xmid, Ymid, DelX/w, formD, paramC, paramD);
  if (showXY)  tfXY.setText( ""+Xmid+", "+Ymid+"; "+(float)DelX);
  repaint();
}

public void paint(Graphics g) {
  g.drawImage(img, 0, 0, this);
  if (DelX > .01) drawLabel(g);
  showStatus( "Time=" + generTime + " msec");
}

public void drawLabel(Graphics gra) {
 double  R=0.,I=0., StZ=DelX/w;
 gra.setColor(Color.white);
 int x,y;
 String s=getParameter("sqrRID"); if (s != null) {
   StringTokenizer st = new StringTokenizer(s);
   double sqrRmid = Double.valueOf(st.nextToken()).doubleValue(),
   sqrImid = Double.valueOf(st.nextToken()).doubleValue();
   int sqr = (int)(Double.valueOf(st.nextToken()).doubleValue()/StZ);
   x = (w - sqr)/2 + (int)((sqrRmid-Xmid)/StZ);
   y = (h - sqr)/2 + (int)((Ymid - sqrImid) /StZ);
   gra.drawRect(x,y, sqr,sqr);}
 gra.setFont(
   new Font( gra.getFont().getName(), Font.BOLD, 15 ) );
 int maxLabel=0;
 while (true) {
   s=getParameter("lb"+maxLabel);
   if (s == null) break;
   StringTokenizer st = new StringTokenizer(s);
   x=w/2+(int)((Double.valueOf(st.nextToken()).doubleValue()-Xmid)/StZ);
   y=h/2+(int)((Ymid-Double.valueOf(st.nextToken()).doubleValue())/StZ);
   gra.drawString(st.nextToken(), x,y);
   maxLabel++; }
}

public void Draw( double Xmid, double Ymid, double Step,
  FormulaD form, double parC, double parD){
  double X,Y;
  int pix=w, ix,iy, p;
  generTime = System.currentTimeMillis();
  for (iy=0, Y=Ymid+Step*h/2; iy < h; iy++, Y-=Step) {
   for (ix=0, X=Xmid-Step*(w/2-1); ix < w; ix++, X+=Step, pix++) {
      p=form.iterate(X, Y, parC, parD, maxIZI2, MaxIt, maxColor);
      if (p == 999) p = maxColor;
      else if (p > maxColor) p %= maxColor;
      else if (p < 0) p = maxColor + 1;
      pixArr[pix] = p;
   }
  }
  img = createImage(new MemoryImageSource(w, h, RainbowColor, pixArr, w, w));
  generTime = System.currentTimeMillis()-generTime;
}

}

abstract class FormulaD{
 abstract int iterate(double x, double y, double paramC, double paramD,
   double max, int MaxIt, int maxCol);
}

class PBiquadH extends FormulaD{
 int iterate(double A, double B, double C, double Ci, double max,
  int MaxIt, int maxCol){
    double X, X2=0, Xo;   int n=0;
    if (C > 0){
     if(A > 0) return maxCol;
     X = Math.sqrt(-A); X2 = X*X;}
    do{  X2 += A; X = X2*X2+B; X2 = X*X;  n++;
    } while ((X2 < 1000.) && (n < MaxIt) );
    if (n < MaxIt) return -1;
    Xo = X;  n = -1;
    do{  X2 += A; X = X2*X2+B; X2 = X*X;  n++;
    } while ((Math.abs(X - Xo) > 1e-8) && (n < 64) );
    if (n == 64) return 999;
    return n;
 }
}
class CubicH extends FormulaD{
 int iterate(double A, double B, double C, double Ci, double max,
  int MaxIt, int maxCol){
    double X = A, X2, Xo, A2 = 3*A*A;   int n=0;
    if (C > 0) X = -A;
    X2=A*A;
    do{  X2 -= A2; X = X2*X+B; X2 = X*X;  n++;
    } while ((X2 < 1000.) && (n < MaxIt) );
    if (n < MaxIt) return -1;
    Xo = X;  n = -1;
    do{  X2 -= A2; X = X2*X+B; X2 = X*X;  n++;
    } while ((Math.abs(X - Xo) > 1e-8) && (n < 64) );
    if (n == 64) return 999;
    return n;
 }
}
class Circle extends FormulaD{
 int iterate(double A, double B, double C, double Ci, double max,
  int MaxIt, int maxCol){
    double X = .5, Xo, B1=25.13*B;   int n=0;
    do{  X = X + A + B1*X*(X-.5)*(X-1.); X -= Math.floor(X);  n++;
    } while (n < MaxIt);
    Xo = X;  n = -1;
    do{  X = X + A + B1*X*(X-.5)*(X-1.); X -= Math.floor(X);  n++;
    } while ((Math.abs(X - Xo) > 1e-8) && (n < 64) );
    if (n == 64) return 999;
    return n;
 }
}
class HenonHJ extends FormulaD{
 int iterate(double a, double b, double Xo, double Yo, double max,
  int MaxIt, int maxCol){
    double b2 = (1-b)*.5, Xs,Ys;
    if (a < 0) Xs = 0;
    else if (Xo > 0)  Xs = -b2 + Math.sqrt(b2*b2 + a) + 1e-10;
    else  Xs = -b2 - Math.sqrt(b2*b2 + a) + 1e-10;
    Ys = Xs;
    double X= a - Xs*Xs + b*Ys, X2=X*X, X1, Y=Ys;   int n=0;
    do{
      X1 = a - X2 + b*Y;  Y = X;
      X = X1;  X2 = X*X;   n++;
    } while ((X2 < 1000.) && (n < MaxIt) );
    if (n < MaxIt) return -1;
    Xo = X; Yo = Y;  n = -1;
    do{
      X1 = a - X*X + b*Y;  Y = X;  X = X1;  n++;
    } while ((Math.abs(X - Xo) + Math.abs(Y - Yo) > 1e-8) && (n < 64) );
    if (n == 64) return 999;
    return n;
 }
}
class HenonH extends FormulaD{
 int iterate(double a, double b, double Xo, double Yo, double max,
  int MaxIt, int maxCol){
    double b1 = (1-b)*.5, d=b1*b1-a, Xs,Ys;
    if (d < 0) Xs = 0;
    else if (Xo > 0)  Xs = b1 + Math.sqrt(d) + 1e-10;
    else  Xs = b1 - Math.sqrt(d) + 1e-10;
    Ys = Xs;
    double X= a + Xs*Xs + b*Ys, X2=X*X, X1, Y=Ys;   int n=0;
    do{
      X1 = a + X2 + b*Y;  Y = X;
      X = X1;  X2 = X*X;   n++;
    } while ((X2 < 1000.) && (n < MaxIt) );
    if (n < MaxIt) return -1;
    Xo = X; Yo = Y;  n = -1;
    do{
      X1 = a + X*X + b*Y;  Y = X;  X = X1;  n++;
    } while ((Math.abs(X - Xo) + Math.abs(Y - Yo) > 1e-8) && (n < 64) );
    if (n == 64) return 999;
    return n;
 }
}