import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
public class ten extends Applet implements 
                                KeyListener,ActionListener{
  Button bs = new Button("開始・消去");
  Button bc = new Button("再計算");
  Panel  pn  = new Panel();
  Panel  ps  = new Panel();
  TextArea ta = new TextArea(8,60);
  double r0 = 0;
  double r1 = 0;
  double r2 = 0;
  String s  = "";
  String x  = "";
  String ind= "";
  Color c;
  int dw,dh; 
  Image img,wimg;
  Graphics wx,wg;
  DecimalFormat f = new DecimalFormat("0.00");
  String t [][] = {{" ","0","010","000","or"," "},
                   {"/","0","040","000","or","e"},
                   {"*","0","070","000","or","e"},
                   {"-","0","100","000","or","e"},
                   {"7","0","010","030","cy","n"},
                   {"8","0","040","030","cy","n"},
                   {"9","0","070","030","cy","n"},
                   {"+","1","100","030","or","e"},
                   {"4","0","010","060","cy","n"},
                   {"5","0","040","060","cy","n"},
                   {"6","0","070","060","cy","n"},
                   {"1","0","010","090","cy","n"},
                   {"2","0","040","090","cy","n"},
                   {"3","0","070","090","cy","n"},
                   {"\n","1","100","090","or","t"},
                   {"=","1","100","090","or","t"},
                   {"0","2","010","120","cy","n"},
                   {".","0","070","120","cy","p"}};

  public void init() {
    pn.setLayout(new GridLayout(1,1));
    pn.add(ta);
    ps.setLayout(new GridLayout(1,2));
    ps.add(bs);
    ps.add(bc);
    setLayout(new BorderLayout());
    add ("South",ps);
    add ("North",pn);
    Dimension w = getSize();
    dw = w.width;
    dh = w.height; 
    img  = createImage(dw,dh);
    wimg = createImage(dw,dh);
    wg = wimg.getGraphics();
    wx  = img.getGraphics();
    bs.addActionListener(this);
    bc.addActionListener(this);
    addKeyListener(this);
    setBackground(Color.black);
    requestFocus();
    key();
    repaint();
  }
  public void paint(Graphics g) {       //Print
    g.drawImage(wimg,40,180,this) ;
    g.setColor(Color.white);
    Font f1 = new Font("MS ゴシック",Font.BOLD,14);
    g.setFont(f1);
    g.drawString("["+x+"]",0,160);
  }
  public void key(){                //keyのレイアウト表示
    wx.setColor(Color.black);
    wx.fillRect(0,0,dw,dh);
    for (int i=0;i<t.length;i++) {
        c=Color.blue ;
        if (t[i][4]=="cy") {c=Color.cyan ;}
        if (t[i][4]=="or") {c=Color.orange;}
    setg(i,wx,c);
    }
    wg.drawImage(img,0,0,this) ;
  }
  void setg(int i,Graphics z,Color c){     //keyのセット
    z.setColor(c);
    if(t[i][1].equals("0")) {z.fillRect(Integer.parseInt(t[i][2]),
                                         Integer.parseInt(t[i][3]),28,28);}
    if(t[i][1].equals("1")) {z.fillRect(Integer.parseInt(t[i][2]),
                                         Integer.parseInt(t[i][3]),28,58);}
    if(t[i][1].equals("2")) {z.fillRect(Integer.parseInt(t[i][2]),
                                         Integer.parseInt(t[i][3]),58,28);}
    Font f1 = new Font("MS Pゴシック",Font.BOLD,18);
    z.setFont(f1);
    z.setColor(Color.black);
    z.drawString(t[i][0],Integer.parseInt(t[i][2])+8,
                            Integer.parseInt(t[i][3])+20);
  }
  public void edt() {                  //key入力の編集
    wg.drawImage(img,0,0,this) ;
    wg.setColor(Color.black);
    for (int i=0;i<t.length;i++) {
      if (s.equals(t[i][0])) {
        setg(i,wg,Color.red);
        if(t[i][5].equals(" ")) {} else {cal(i);ta.append(s);}
      }
    }
  }
  void clr(){ta.setText("");s="";x="";r0=0;r1=0;r2=0;ind="";} //エリアのクリア
  void cal(int j){                   //入力チェック＆計算
    if(t[j][5].equals("n")){
      if(x.length()>20){s="";return;}
      if(r0==0){x=""+s;r0=-1;return;} else {x+=s;r0=-1;return;}
    }
    if(t[j][5].equals("p")){
      if(x==""|x.indexOf(".")!=-1) {s="";return;}
      if(r0==0){x=""+s;r0=-1;return;} else {x+=s;r0=-1;return;}
    }
    if(s.equals(".")){s="";return;}
    if(t[j][5].equals("t")){s="=";}
    r1=gd(x);
    if(ind.equals("+")) {r2=r2+r1;r0=0;r1=0;}
    if(ind.equals("-")) {r2=r2-r1;r0=0;r1=0;}
    if(ind.equals("*")) {r2=r2*r1;r0=0;r1=0;}
    if(ind.equals("/")) {r2=r2/r1;r0=0;r1=0;}
    if(ind.equals("=")) {r2=   r1;r0=0;r1=0;}
    if(ind.equals("" )) {r2=   r1;r0=0;r1=0;}
    ind=s;
    x=""+r2;
    s+="\n";
  } 
  double gd(String q){         //数字編集
    int ql=q.indexOf(".");
    if(ql==-1){return(Double.parseDouble(q));}
    double qa=Double.parseDouble(q.substring(0,ql));
    double qb=Double.parseDouble(q.substring(ql+1,q.length()));
    return( qa+(qb/(Math.pow(10,(q.length()-ql-1)))));
  } 
  public void actionPerformed(ActionEvent e) {    //ボタン押下の処理
    if (e.getSource()==bs) {
      clr();
    }
    if (e.getSource()==bc) {
      String buf=ta.getText();
      clr();
      for(int i=0;i<buf.length();i++){
        s=buf.substring(i,i+1);
        if(s.equals("\n")){s="";} else{edt();}
      }
    }
    s="";edt();
    requestFocus();
    repaint();
  }
  public void keyTyped(KeyEvent e) {       //key入力イベント処理
    s = ""+e.getKeyChar();
    edt();
    repaint(); 
  }
  public void keyPressed(KeyEvent e) { }   //key押下イベント処理
  public void keyReleased(KeyEvent e ) {   //keyリリーズイベント処理
    wg.drawImage(img,0,0,this) ;
    repaint();
  }

}