package celebrate;
/**
* @author Marc Heiligenstein
*
* Easter ,Acension and Pentecost after good old Gauss
*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Easter extends Applet implements ActionListener{
private Thread easterThread;
private Button knopf;
private int jahr, m, n;
//Textfields for getting and showing text
private TextField eingabe, ostern, himmel, pfingsten;
//Labels for showing text
private Label leingabe, lostern, lhimmel, lpfingsten;
//Some color
private Color blue = new Color(25, 0, 240),
red = new Color(150, 0, 50),
green = new Color(0, 100, 100);
// A mark for calculating Acension and Pentecost
private int merken = 0;
//Starting the applet
public void start() {
easterThread = new Thread();
easterThread.start();
}
public void init() {
//The Layout-Manager
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
setFont(new Font("Arial", Font.PLAIN, 15));
setLayout(gridbag);
//Label for the year
c.weighty = 0.25;
c.weightx = 1.0;
leingabe = new Label("Year: ");
gridbag.setConstraints(leingabe, c);
add(leingabe);
//Text-Field for the submission of the year
c.weighty = 0.25;
c.gridwidth = GridBagConstraints.REMAINDER;
eingabe = new TextField("2005", 15);
eingabe.setFont(new Font("Monospaced", Font.PLAIN, 15));
gridbag.setConstraints(eingabe, c);
add(eingabe);
//The button which causes the calculation
c.gridwidth = 1;
knopf = new Button("Easter");
knopf.setBackground(green);
c.anchor = GridBagConstraints.CENTER;
c.gridwidth = GridBagConstraints.REMAINDER;
gridbag.setConstraints(knopf, c);
add(knopf);
//When the button is pressed
knopf.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent h) {
knopf_actionPerformed(h);
}
});
//For the output,at first for Easter
c.gridwidth = 1;
lostern = new Label("Date of Easter: ");
gridbag.setConstraints(lostern, c);
add(lostern);
//Output Easter
c.gridwidth = GridBagConstraints.REMAINDER;
ostern = new TextField(15);
ostern.setEditable(false);
ostern.setForeground(blue);
gridbag.setConstraints(ostern, c);
add(ostern);
//Acension
c.gridwidth = 1;
lhimmel = new Label("Date of Acension: ");
gridbag.setConstraints(lhimmel, c);
add(lhimmel);
//Output Acension
c.gridwidth = GridBagConstraints.REMAINDER;
himmel = new TextField(15);
himmel.setEditable(false);
himmel.setForeground(green);
gridbag.setConstraints(himmel, c);
add(himmel);
//Pentecost
c.gridwidth = 1;
lpfingsten = new Label("Date of Pentecost: ");
gridbag.setConstraints(lpfingsten, c);
add(lpfingsten);
//Output Pentecost
c.gridwidth = GridBagConstraints.REMAINDER;
pfingsten = new TextField(15);
pfingsten.setEditable(false);
pfingsten.setForeground(red);
gridbag.setConstraints(pfingsten, c);
add(pfingsten);
}
//Is needed, because the ActionPerformed-Class is used as inner-class
public void actionPerformed(ActionEvent l) {
}
//When the button is pushed.....action!
void knopf_actionPerformed(ActionEvent h) {
//import of the year
jahr = Integer.parseInt(eingabe.getText());
//if the year is in the allowed range...go on
if (jahr >= 1800 && jahr <= 2199) {
//at first m and n have to be calculated
if (jahr >= 1800 && jahr <= 1899) {
n = 4;
m = 23;
} else if (jahr >= 1900 && jahr <= 2099) {
n = 5;
m = 24;
} else if (jahr >= 2100 && jahr <= 2199) {
n = 6;
m = 24;
}
//Calculating Easter*********************************************************
int a = jahr % 19; // The year modulo 19 , etc
int b = jahr % 4;
int c = jahr % 7;
int d = ((19 * a) + m) % 30;
int e = ((2 * b) + (4 * c) + (6 * d) + n) % 7;
//Only the 31. March is allowed. Otherwise we go to April
if ((22 + d + e) < 32) {
ostern.setText(22 + d + e + ". March " + jahr);
merken = 1;
}
//The 26. April is substitute for the 19. April
else if ((d + e - 9) == 26) {
ostern.setText("19. April " + jahr);
merken = 2;
}
//The 25. April is substitute for the 18. April
else if (((d + e - 9) == 25) && d == 28 && e == 6 && a >= 10) {
ostern.setText("18. April " + jahr);
merken = 3;
} else {
ostern.setText(d + e - 9 + ". April " + jahr);
merken = 0;
}
//Calculating Acension ****************************************************
//if Easter is in March
if (merken == 1) {
int tag = 22 + d + e + 40 - 62;
himmel.setText(tag + ". May " + jahr);
}
//if Easter is in April
else if (merken == 2) {
int tag = 19 + 40 - 31;
himmel.setText(tag + ". May " + jahr);
} else if (merken == 3) {
int tag = 18 + 40 - 31;
himmel.setText(tag + ". May " + jahr);
} else {
if ((d + e - 9) < 23) {
int tag = d + e - 9 + 40 - 31;
himmel.setText(tag + ". May " + jahr);
} else {
int tag = d + e - 9 + 40 - 62;
himmel.setText(tag + ". June " + jahr);
}
}
//Calculating Pentecost*********************************************************
// if Easter is in March
if (merken == 1) {
int tag = 22 + d + e + 50 - 62;
pfingsten.setText(tag + ". May " + jahr);
}
//if Easter is in April
else if (merken == 2) {
int tag = 19 + 50 - 62;
pfingsten.setText(tag + ". June " + jahr);
} else if (merken == 3) {
int tag = 18 + 50 - 62;
pfingsten.setText(tag + ". June " + jahr);
} else if (merken == 0) {
if ((d + e - 9) < 13) {
int tag = d + e - 9 + 50 - 31;
pfingsten.setText(tag + ". May " + jahr);
} else {
int tag = d + e - 9 + 50 - 62;
pfingsten.setText(tag + ". June " + jahr);
}
}
} else {
//if the year is not in the allowed range...
ostern.setText("False year");
himmel.setText("only from 1800");
pfingsten.setText("to 2199");
}
}
//stopping the applet
public void stop() {
easterThread = null;
}
//destroying the applet
public void destroy() throws NullPointerException {
try {
easterThread.destroy();
} catch (NullPointerException e) {
}
}
}
