import java.awt.*;
import java.awt.event.*;
import java.applet.*;

/**
 * @author Oliver Mezger
 * @version 1.0
 */

public class Flaeche extends Applet {
  private boolean isStandalone = false;
  private Label label1 = new Label();
  private Label label2 = new Label();
  private Choice choice1 = new Choice();
  private Label label_ein1 = new Label();
  private TextField textField_ein1 = new TextField();
  private Label label_ein2 = new Label();
  private TextField textField_ein2 = new TextField();
  private Label label_aus1 = new Label();
  private Button button1 = new Button();
  private Label label_cr = new Label();
  //private PopupMenu popupMenu1 = new PopupMenu();
  //Parameterwert holen
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  //Das Applet konstruieren
  public Flaeche() {
  }
  //Das Applet initialisieren
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Initialisierung der Komponenten
  private void jbInit() throws Exception {
    label1.setFont(new java.awt.Font("Lucida Grande", 1, 16));
    label1.setText("Flächenrechner");
    label1.setBounds(new Rectangle(118, 15, 140, 16));
    this.setLayout(null);
    label2.setText("Flächentyp");
    label2.setBounds(new Rectangle(27, 59, 73, 25));
    choice1.setBounds(new Rectangle(107, 57, 121, 24));
    choice1.addItemListener(new java.awt.event.ItemListener() {
      public void itemStateChanged(ItemEvent e) {
        choice1_itemStateChanged(e);
      }
    });
    label_ein1.setText("Kantenlänge:");
    label_ein1.setBounds(new Rectangle(20, 93, 86, 23));
    textField_ein1.setBounds(new Rectangle(109, 94, 102, 21));
    label_ein2.setText("Breite:");
    label_ein2.setVisible(false);
    label_ein2.setBounds(new Rectangle(22, 124, 79, 19));
    textField_ein2.setVisible(false);
    textField_ein2.setBounds(new Rectangle(109, 122, 103, 21));
    label_aus1.setText("Fläche = ?");
    label_aus1.setBounds(new Rectangle(30, 196, 114, 26));
    button1.setLabel("Berechnen");
    button1.setBounds(new Rectangle(248, 72, 110, 40));
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    label_cr.setText("© Oliver Mezger \'2003");
    label_cr.setBounds(new Rectangle(222, 279, 177, 16));
    this.setBackground(Color.yellow);
    choice1.add("Quadrat");
    choice1.add("Rechteck");
    this.add(label1, null);
    this.add(label2, null);
    this.add(choice1, null);
    this.add(label_ein1, null);
    this.add(textField_ein1, null);
    this.add(label_ein2, null);
    this.add(textField_ein2, null);
    this.add(label_aus1, null);
    this.add(label_cr, null);
    this.add(button1, null);

  }
  //Applet-Information holen
  public String getAppletInfo() {
    return "Applet-Information";
  }
  //Parameter-Infos holen
  public String[][] getParameterInfo() {
    return null;
  }

  void choice1_itemStateChanged(ItemEvent e) { // wird aufgerufen, wenn die Form geaendert wird
    if (choice1.getSelectedIndex()==0){
      label_ein1.setText("Kantenlänge:");
      label_ein2.setVisible(false);
      textField_ein2.setVisible(false);
    }
    else if (choice1.getSelectedIndex()==1){
      label_ein1.setText("Länge:");
      label_ein2.setText("Breite:");
      label_ein2.setVisible(true);
      textField_ein2.setVisible(true);
    }
  }

  boolean bcr = true;                 // Mezgers Gag

  void change_copyright(){            // Mezgers Gag
    if (bcr) label_cr.setText("Made with Mac OS X"); // Mezgers Gag
    else label_cr.setText("© Oliver Mezger \'2003"); // Mezgers Gag
    bcr = !bcr;        // Mezgers Gag
  }

  void button1_actionPerformed(ActionEvent e) {
    double a,b,f=0.0;
    a = Double.valueOf(textField_ein1.getText()).doubleValue();
    if (choice1.getSelectedIndex()==0){
      f = a*a;
    }
    else if (choice1.getSelectedIndex()==1){
      b = Double.valueOf(textField_ein2.getText()).doubleValue();
      f = a*b;
    }
    label_aus1.setText("Fläche = " + Double.toString(f));
    change_copyright(); // Mezgers Gag
  }
}