/** F3 ***** ITKP2-föreläsning3*********************************
* En applikation som testkör klassen Fibonacci i ett GUI
*   
* @author Peter Mozelius
* @version 1.01
* Rapportera hittade fel till: 
*<adress>mozelius@dsv.su.se</adress>
****************************************************************/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class F3 extends JFrame implements ActionListener {
  private int antal = 5;
  private Fibonacci fibo;
  private Container korg;
  private JButton knapp;
  private JTextArea ta;
  private JPanel nordPanel, sydPanel;
  private ButtonGroup grupp;
  private JRadioButton[] radio;  

  public F3() {
    super("Föreläsning 3");
    setSize(200, 300);
    skapaGUI();
  }
  
  public void skapaGUI() {
    korg = getContentPane();
    korg.setLayout(new BorderLayout());
    sydPanel = new JPanel();
    knapp = new JButton("Visa det valda antalet fibonaccital");
    knapp.addActionListener(this);
    sydPanel.add(knapp);
    korg.add("South", sydPanel);
    ta = new JTextArea();
    ta.setBackground(new Color(255, 255, 225));
    ta.setPreferredSize(new Dimension(200, 175));    
    korg.add("Center", ta);

    nordPanel = new JPanel();
    grupp = new ButtonGroup();   
    radio = new JRadioButton[10];
    
    for(int i = 0, j = 1; i < 10; i++, j++) {
        radio[i] = new JRadioButton(""+ j);
        radio[i].setActionCommand(""+ j);
        grupp.add(radio[i]);
        nordPanel.add(radio[i]);               
    }

    radio[7].setSelected(true);
    korg.add("North", nordPanel);
    
    pack();
    setVisible(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
  }

  public void actionPerformed(ActionEvent e) { 
    if(e.getSource() == knapp) {
      antal = Integer.parseInt(grupp.getSelection().getActionCommand());
      fibo = new Fibonacci(antal);
      ta.setText(fibo.toString());     
    }
  }

   public static void main(String[] args) {
    new F3();
  }

}//F3

class Fibonacci{

  private int antal;
  private String str="";

  public Fibonacci(int antal) {
    this.antal = antal;
  }    

  public String toString() {
     int low   = 1;
     int high  = 1;

     for(int i = 1; i <= antal; i++){
         str += "Fibonacci " + i + ": " +"\t" + high + "\n";
         high += low;
         low = high-low;         
     }
     return str;     
  } 
}