DueDateCalculator
/*
* This program is a modification of a Sun Microsystems example program.
* It is intented as a demonstration of a Java program and not as a serious clinical tool.
* It has not been completely tested.
* This is my first crack at Java so please don't take it as good style
*
* The developmental comments were adapted from
* "The developing human" 3rd Edition by Keith L. Moore.
*
* Randy Giffen, Jan 1996
* rgiffen@fox.nstn.ca
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
/* This program could use some layout work, and the functionality
* could use some tweaking, but it seems to basically work.
*/
import java.awt.*;
import java.util.*;
import java.applet.Applet;
public class DueDateCalculator extends Applet {
Frame window;
DatePanel LMPPanel;
TextArea outputArea;
String days[] = new String[31];
String years[] = new String[10];
String months[] = new String[12];
public void init() {
years[0] = "1995";
years[1] = "1996";
years[2] = "1997";
years[3] = "1998";
years[4] = "1999";
years[5] = "2000";
years[6] = "2001";
years[7] = "2002";
years[8] = "2003";
years[9] = "2004";
months[0] = "January";
months[1] = "February";
months[2] = "March";
months[3] = "April";
months[4] = "May";
months[5] = "June";
months[6] = "July";
months[7] = "August";
months[8] = "September";
months[9] = "October";
months[10] = "November";
months[11] = "December";
LMPPanel = new DatePanel(this, "First day of Last Period: ", months, years);
outputArea = new TextArea();
outputArea.setEditable(false);
setLayout(new BorderLayout(10,10));
add("North", LMPPanel);
add("Center", outputArea);
add("South", new Label("Disclaimer - This program is a Java demonstration only and not a reliable clinical tool.", Label.CENTER));
}
public void start() {
resize(550,400);
}
/* Respond to user actions. */
public boolean handleEvent(Event e) {
if (e.target instanceof Button) {
newOutputText();
return true;
}
return false;
}
public void newOutputText() {
/* Called when the user presses the calculate button.
* Check the date and update the text area
*/
Date LMPDate;
Date dueDate;
Date today = new Date();
Date errorDate = new Date();
String tempString;
String weight;
String length;
int age;
int weeks;
LMPDate = LMPPanel.getDate();
if (LMPDate.getYear() == 50) {
outputArea.setText("Invalid date. Try again");
return;
}
dueDate = calcDueDate(LMPDate);
tempString = dueDate.toString();
outputArea.setText("The predicted due date (EDC) ");
if (today.before(dueDate)) {
outputArea.appendText("is: ");
} else {
outputArea.appendText("was: ");
}
outputArea.appendText(tempString.substring(0, 10));
outputArea.appendText(", " + tempString.substring(21) + ".\n");
age = calcGestationalAge(LMPDate);
if ((age >= 21) && (age <= 308)) { //add info if currently pregnant
weeks = age / 7;
outputArea.appendText("Estimated gestational age: " + Integer.toString(age) + " days (");
outputArea.appendText(Integer.toString(weeks) + " weeks)\n\n");
weight = weightForWeek(weeks);
if (weight != "") {
outputArea.appendText("Current weight: " + weight + " grams\n");
}
length = lengthForWeek(weeks);
if (length != "") {
outputArea.appendText("Current length: " + length + " centimeters\n\n");
}
outputArea.appendText(commentsForWeek(weeks));
}
return;
}
private static int mlength[] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
Date calcDueDate(Date LMPDate) {
/*
* Calculate the due date as 280 days from the LMP
* The fact that 2000 is a leap year makes the algorithm slightly simpler
*/
Date dueDate = new Date();
int day = LMPDate.getDate();
int month = LMPDate.getMonth();
int year = LMPDate.getYear();
int daysInMonth;
// Add 280 days
day = day + 280;
daysInMonth = mlength[(month)];
if ((month == 1) && (year%4 == 0)) {
daysInMonth = 29; //leap year
}
while (day > daysInMonth) {
month = month + 1;
if (month == 12) {
month = 0;
year = year + 1;
}
daysInMonth = mlength[(month)];
if ((month == 1) && (year%4 == 0)) {
daysInMonth = 29; //leap year
}
day = day - daysInMonth;
// System.out.println(Integer.toString(day));
}
dueDate = new Date(year, month, day);
return(dueDate);
}
int calcGestationalAge(Date LMPDate) {
/*
* Calculate the Gestational age using LMPDate and today's date.
* Return 0 if LMP hasn't come yet.
*/
Date todayDate = new Date();
int days;
int day = LMPDate.getDate();
int month = LMPDate.getMonth();
int year = LMPDate.getYear();
int todayDay = todayDate.getDate();
int todayMonth = todayDate.getMonth();
int todayYear = todayDate.getYear();
if (LMPDate.after(todayDate)) {
return(0) ;
}
// Count the Days
days = 0;
while ((year < todayYear) || (month < todayMonth) || (day < todayDay)) {
days = days + 1;
day = day + 1;
if (day > mlength[month]) {
if ((month == 1) && (day == 29) && (year%4 == 0)) {
//29 Feb, leap year so let it go by
} else {
day = 1;
month = month + 1;
if (month == 12) {
month = 0;
year = year + 1;
}
}
}
}
return(days);
}
private static String dComment[] = {
"","","",
"Ovulation usually occurs by now.",//3
"Implantation in the wall of the uterus.\nPrimitive placental circulation established.",
"First missed menstral period.\nBrain begins to form.",
"Heart begins to beat.\nArm and leg buds present.",
"Eyes developing.",
"Mouth and nose forming.\nArms bent at elbow.",
"Eyelids beginning.\nTrunk elongating and straightening.",//9
"Fingers distinct.\nBeginnings of all essential external and internal structures are present.",
"Eyes closing or closed.\nHead more rounded.\nExternal genitalia still not distinguished as male or female.\nIntestines in umbilical cord.",
"Facehas human profile.\nIntestine in abdomen.\nEarly fingernail development.", //12
"","Sex distinguishable externally.\nWell-defined neck." ,
"","Head erect.\nLower limbs well developed." ,
"","Ears stand out from head.",
"","Vernix caseosa present.\nEarly noenail development." ,
"","Head and body hair (lanugo) visible." ,
"","Skin wrinked and red." ,
"","Fingernails present.\nLean Body." ,
"","Eyes partially open.\nEyelashes present." ,
"","Eyes open.\nSkin slightly wrinked." ,
"","Toenails present.\nBody filling out.\nTestis descending in males.",
"","Fingernails reach finger tips.\nSkin pink and smooth.", //34
"","","","Body usually plump.\nLanugo hairs almost absent.\nToenails reach toe tips.\nFlexed limbs, firm grasp.",
"","Full term.\nProminent chest, breasts protrude.\nFingernails extend beyond finger tips.", //40
"","Overdue",
"Overdue",
"Overdue","",""
};
public String commentsForWeek(int week) {
return(dComment[week]);
}
private static String dWeight[] = {
"","","","","","","",
"0.5", "1", "2", "5", "10", "20", "35", "60", "85", "120","160", "220",
"270", "330", "395", "460", "540", "650", "740", "850", "960",
"1100", "1240", "1420", "1560", "1750", "1900", "2080", "2260",
"2420", "2640", "2900", "3050", "3250", "", "" ,"", "", ""
};
public String weightForWeek(int week) {
return(dWeight[week]);
}
private static String dLength[] = {
"","","","","","","",
"2", "4", "5", "6", "7", "9",
"10", "12", "14", "16", "18", "20",
"22", "25", "26", "28", "29", "30",
"31", "32", "33", "35", "36", "38",
"39", "40", "41", "42", "43", "45",
"46", "48", "49", "50","","","","",""
};
public String lengthForWeek(int week) {
return(dLength[week]);
}
public static void main(String args[]) {
Frame f = new Frame("Due Date Calculator");
DueDateCalculator calculator = new DueDateCalculator();
calculator.init();
f.add("Center", calculator);
f.pack();
f.show();
}
}
class DatePanel extends Panel {
String title;
Label label;
TextField dayField;
Choice dayChooser;
Choice monthChooser;
Choice yearChooser;
Button calcButton;
int min = 0;
int max = 10000;
DueDateCalculator controller;
Panel bottomPanel = new Panel();
String years[];
String months[];
DatePanel(DueDateCalculator myController, String myTitle, String myMonths[], String myYears[]) {
super();
controller = myController;
title = myTitle;
months = myMonths;
years = myYears;
//Add the label
label = new Label(title, Label.LEFT);
add(label);
//Add the text field
dayField = new TextField("1", 5);
dayField.setEditable(true);
bottomPanel.add(dayField);
//Add the pop-up lists (Choice)
monthChooser = new Choice();
for (int i = 0; i < months.length; i++) {
monthChooser.addItem(months[i]);
}
bottomPanel.add(monthChooser);
yearChooser = new Choice();
for (int i = 0; i < years.length; i++) {
yearChooser.addItem(years[i]);
}
bottomPanel.add(yearChooser);
//Add the button
calcButton = new Button("Calculate");
bottomPanel.add(calcButton);
add(bottomPanel);
}
private static int mlength[] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
Date getDate() {
/*
* Get the date from the data entry widgets.
* Return a date with a year of 50 for invalid data
*/
Date errorDate = new Date();
Date LMPDate = new Date();
int day;
int month;
int year;
// Get date of LMP
errorDate.setYear(50);
try {
day = Integer.valueOf(dayField.getText()).intValue();
} catch (java.lang.NumberFormatException e) {
return(errorDate);
}
month = monthChooser.getSelectedIndex();
year = yearChooser.getSelectedIndex() + 95;
//Check the day according to the month (i.e. no Feb 30th)
if ((day < 1) || (day > mlength[month])) {
if ((year%4 == 0) && (month == 1) && (day == 29)) {
//let it go (Feb 29)
} else {
return(errorDate);
}
}
LMPDate = new Date(year, month, day);
return(LMPDate);
}
}
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