import java.awt.*;
import java.applet.*;
import java.lang.*;

public class huetr extends Applet {

  // an das Rechenwerk zu uebergebende Funktion
  public keybox keyBuffer;
  
  // vom Rechenwerk uebergebener Displayinhalt
  public displaybox displayBuffer;

  // Tasten
  fsButton cTaste;
  fsButton ceTaste;
  fsButton lgTaste;
  fsButton invTaste;
  fsButton prozTaste;
  fsButton klAufTaste;
  fsButton klZuTaste;
  fsButton geteilt;
  fsButton asinTaste;
  fsButton sinTaste;
  fsButton lnTaste;
  fsButton yHochxTaste;
  fsButton sieben;
  fsButton acht;
  fsButton neun;
  fsButton mal;
  fsButton acosTaste;
  fsButton cosTaste;
  fsButton eTaste;
  fsButton sqrt;
  fsButton vier;
  fsButton fuenf;
  fsButton sechs;
  fsButton minus;
  fsButton atanTaste;
  fsButton tanTaste;
  fsButton piTaste;
  fsButton sqr;
  fsButton eins;
  fsButton zwei;
  fsButton drei;
  fsButton plus;
  fsButton stoTaste;
  fsButton sumTaste;
  fsButton rclTaste;
  fsButton expTaste;
  fsButton nix;
  fsButton punkt;
  fsButton vorzeichenwechsel;
  fsButton gleich;
  fsButton huetr;

  // Display (wird durch ein TextField realisiert)
  TextField display;

  Taschenrechner Rechenwerk;

  // Initialisieren des "HandelsUEblichenTaschenRechners"
  public void init() {
    super.init();
    displayBuffer = new displaybox();
    displayBuffer.memFlag = false;
    displayBuffer.errFlag = false;
    displayBuffer.display=0;
    keyBuffer = new keybox();
    keyBuffer.key = "";
    keyBuffer.used = false;
    Rechenwerk = new Taschenrechner(this);
    Rechenwerk.start();
    
    // Panel initialisieren und Layoutmanager setzen, fuer jede Tastenreihe neu
    Panel keys = new Panel();
    keys.setLayout(new FlowLayout(FlowLayout.LEFT,1,1));
    this.setLayout(new FlowLayout(FlowLayout.CENTER,1,1));

    // Display initialisieren und in Panel einfuegen
    display = new TextField(14);
    display.setEditable(false);  // Wert ist nicht editierbar
    display.setFont(new Font("Courier",Font.PLAIN,14));
    this.add(display);
    
    // Buttons initialisieren und einfuegen
    cTaste = new fsButton("AC");
    cTaste.setBackground(Color.blue);
    cTaste.setForeground(Color.lightGray);
    keys.add(cTaste);

    ceTaste = new fsButton("CE");
    ceTaste.setBackground(Color.blue);
    ceTaste.setForeground(Color.lightGray);
    keys.add(ceTaste);

    lgTaste = new fsButton("lg");
    lgTaste.setForeground(Color.blue);
    keys.add(lgTaste);

    invTaste = new fsButton("1/X");
    invTaste.setForeground(Color.blue);
    keys.add(invTaste);

    prozTaste = new fsButton("%");
    prozTaste.setForeground(Color.blue);  
    keys.add(prozTaste);

    klAufTaste = new fsButton("(");
    keys.add(klAufTaste);

    klZuTaste = new fsButton(")");
    keys.add(klZuTaste);

    geteilt = new fsButton("/");
    geteilt.setForeground(Color.red);
    keys.add(geteilt);

    this.add(keys);  //Tasten in Panel einfuegen
 
    //naechste Reihe, als neues Panel realisiert
    keys = new Panel();
    keys.setLayout(new FlowLayout(FlowLayout.LEFT,1,1));

    asinTaste = new fsButton("ASIN");
    asinTaste.setForeground(Color.blue);
    keys.add(asinTaste);

    sinTaste = new fsButton("SIN");
    sinTaste.setForeground(Color.blue);
    keys.add(sinTaste);

    lnTaste = new fsButton("ln");
    lnTaste.setForeground(Color.blue);
    keys.add(lnTaste);

    yHochxTaste = new fsButton("y^x");
    yHochxTaste.setForeground(Color.blue);
    keys.add(yHochxTaste);

    sieben = new fsButton("7");
    keys.add(sieben);

    acht = new fsButton("8");
    keys.add(acht);

    neun = new fsButton("9");
    keys.add(neun);

    mal = new fsButton("*");
    mal.setForeground(Color.red);
    keys.add(mal);

    this.add(keys);

    //dritte Reihe
    keys = new Panel();
    keys.setLayout(new FlowLayout(FlowLayout.LEFT,1,1));    

    acosTaste = new fsButton("ACOS");
    acosTaste.setForeground(Color.blue);
    keys.add(acosTaste);

    cosTaste = new fsButton("COS");
    cosTaste.setForeground(Color.blue);
    keys.add(cosTaste);

    eTaste = new fsButton("e");
    eTaste.setForeground(Color.blue);
    keys.add(eTaste);

    sqrt = new fsButton("SQRT");
    sqrt.setForeground(Color.blue);
    keys.add(sqrt);

    vier = new fsButton("4");
    keys.add(vier);

    fuenf = new fsButton("5");
    keys.add(fuenf);

    sechs = new fsButton("6");
    keys.add(sechs);

    minus = new fsButton("-");
    minus.setForeground(Color.red);
    keys.add(minus);

    this.add(keys);

    //vierte Reihe
    keys = new Panel();
    keys.setLayout(new FlowLayout(FlowLayout.LEFT,1,1));

    atanTaste = new fsButton("ATAN");
    atanTaste.setForeground(Color.blue);
    keys.add(atanTaste);

    tanTaste = new fsButton("TAN");
    tanTaste.setForeground(Color.blue);
    keys.add(tanTaste);

    piTaste = new fsButton("Pi");
    piTaste.setForeground(Color.blue);
    keys.add(piTaste);

    sqr = new fsButton("SQR");
    sqr.setForeground(Color.blue);
    keys.add(sqr);

    eins = new fsButton("1");
    keys.add(eins);

    zwei = new fsButton("2");
    keys.add(zwei);

    drei = new fsButton("3");
    keys.add(drei);

    plus = new fsButton("+");
    plus.setForeground(Color.red);
    keys.add(plus);

    this.add(keys);

    //letzte Zeile
    keys = new Panel();
    keys.setLayout(new FlowLayout(FlowLayout.LEFT,1,1));

    stoTaste = new fsButton("STO");
    stoTaste.setBackground(Color.orange);
    keys.add(stoTaste);

    sumTaste = new fsButton("SUM");
    sumTaste.setBackground(Color.orange);
    keys.add(sumTaste);

    rclTaste = new fsButton("RCL");
    rclTaste.setBackground(Color.orange);
    keys.add(rclTaste);

    expTaste = new fsButton("EXP");
    expTaste.setForeground(Color.blue);    
    keys.add(expTaste);

    nix = new fsButton("0");
    keys.add(nix);

    punkt = new fsButton(".");
    keys.add(punkt);

    vorzeichenwechsel = new fsButton("+/-");
    keys.add(vorzeichenwechsel);

    gleich = new fsButton("=");
    gleich.setForeground(Color.red);
    keys.add(gleich);

    this.add(keys); 

  }

  //Bearbeiten von Tastatur- und Mausereignissen und
  // Funktion an Rechenwerk weiterleiten.
  public synchronized boolean handleEvent(Event e) {
    if (e.target == Rechenwerk) {
      updateDisplay();
    } else synchronized(keyBuffer) {
    if (!keyBuffer.used) {
      if (((e.id == Event.ACTION_EVENT) && (e.target == cTaste)) || 
    	  ((e.id == Event.KEY_PRESS)    && (e.key == 99))) {
	keyBuffer.key= new String("AC"); keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
      } else
	if (((e.id == Event.ACTION_EVENT) && (e.target == ceTaste)) || 
    	  ((e.id == Event.KEY_PRESS)    && (e.key == 67))) {
	keyBuffer.key= new String("CE"); keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	} else
	  if (((e.id == Event.ACTION_EVENT) && (e.target == lgTaste)) || 
	      ((e.id == Event.KEY_PRESS)    && (e.key == 76))) {
	    keyBuffer.key= new String("LG"); keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	  } else
	    if (((e.id == Event.ACTION_EVENT) && (e.target == invTaste)) || 
		((e.id == Event.KEY_PRESS)    && (e.key == 105))) {
	      keyBuffer.key= new String("1/X"); keyBuffer.used=true;
	      synchronized(Rechenwerk) {Rechenwerk.notify();};
	      return true;
            } else
	      if (((e.id == Event.ACTION_EVENT) && (e.target == prozTaste)) || 
		  ((e.id == Event.KEY_PRESS)    && (e.key == 37))) {
		keyBuffer.key="%"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == klAufTaste)) || 
		  ((e.id == Event.KEY_PRESS)    && (e.key == 40 ))) {
		keyBuffer.key="("; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == klZuTaste)) || 
		  ((e.id == Event.KEY_PRESS)    && (e.key == 41))) {
		keyBuffer.key=")"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == geteilt)) || 
		  ((e.id == Event.KEY_PRESS)    && (e.key == 47))) {
		keyBuffer.key="/"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == asinTaste)) || 
		  ((e.id == Event.KEY_PRESS)    && (e.key == 72))) {
		keyBuffer.key="ASIN"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == sinTaste)) || 
		  ((e.id == Event.KEY_PRESS)    && (e.key == 104))) {
		keyBuffer.key="SIN"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == lnTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 108))) {
		keyBuffer.key="LN"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == yHochxTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 94))) {
		  keyBuffer.key="X^Y"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == sieben)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 55))) {
		  keyBuffer.key="7"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == acht)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 56))) {
		  keyBuffer.key="8"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == neun)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 57))) {
		  keyBuffer.key="9"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == mal)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 42))) {
		  keyBuffer.key="*"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == acosTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 74))) {
		  keyBuffer.key="ACOS"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == cosTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 106))) {
		  keyBuffer.key="COS"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == eTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 101))) {
		  keyBuffer.key="E"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == sqrt)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 84))) {
		  keyBuffer.key="SQRT"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == vier)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 52))) {
		  keyBuffer.key="4"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == fuenf)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 53))) {
		  keyBuffer.key="5"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == sechs)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 54))) {
		  keyBuffer.key="6"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == minus)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 45))) {
		keyBuffer.key="-"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == atanTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 75))) {
		  keyBuffer.key="ATAN"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == tanTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 107 ))) {
		  keyBuffer.key="TAN"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == piTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 80))) {
		  keyBuffer.key="PI"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == sqr)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 82))) {
		  keyBuffer.key="SQR"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == eins)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 49))) {
		  keyBuffer.key="1"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == zwei)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 50))) {
		  keyBuffer.key="2"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == drei)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 51))) {
		  keyBuffer.key="3"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == plus)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 43))) {
		  keyBuffer.key="+"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == stoTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 83))) {
		  keyBuffer.key="STO"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == sumTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 115))) {
		  keyBuffer.key="SUM"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == rclTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 114))) {
		  keyBuffer.key="RCL"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == expTaste)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 69))) {
		  keyBuffer.key="EXP"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == nix)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 48))) {
		  keyBuffer.key="0"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == punkt)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 46))) {
		  keyBuffer.key="."; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == vorzeichenwechsel)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 35))) {
		  keyBuffer.key="+/-"; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
	      } else
		if (((e.id == Event.ACTION_EVENT) && (e.target == gleich)) || 
		    ((e.id == Event.KEY_PRESS)    && (e.key == 61))) {
		  keyBuffer.key="="; keyBuffer.used=true; synchronized(Rechenwerk) {Rechenwerk.notify();}; return true;
		}

    }
    }
    
    return false;
  }
  
  // Applet zeichnen
  public void paint(Graphics g) {
    updateDisplay();
  }

  // darzustellenden Wert in einen String umwandeln
  // und rechtsbuendig orientieren. Sofern das Errorflag
  // gesetzt ist, wird "Error" im Display angezeigt. Wenn
  // der Speicher einen Wert ungleich Null annimmt, wird
  // zusaetzlich "M" linksbuendig angezeigt.
  public void updateDisplay() {
    if (displayBuffer.errFlag==true)
      display.setText("Error");
    else {
      String tmp = new String();

      if (displayBuffer.memFlag)
	tmp = tmp.concat("M ");

      String strDisplay = new String(String.valueOf(displayBuffer.display));
      for (int mh = strDisplay.length(); mh < 12; mh++)
        tmp = tmp.concat(" ");
      tmp = tmp.concat(strDisplay);
      display.setText(tmp);
    }

  }

 
  
}