//--------------------- Copyright Block ----------------------
/*
PrayTime.java: Prayer Times Calculator (ver 1.0)
Copyright (C) 2007-2010 PrayTimes.org
Java Code By: Hussain Ali Khan
Original JS Code By: Hamid Zarrabi-Zadeh
License: GNU LGPL v3.0
TERMS OF USE:
Permission is granted to use this code, with or
without modification, in any website or application
provided that credit is given to the original work
with a link back to PrayTimes.org.
This program is distributed in the hope that it will
be useful, but WITHOUT ANY WARRANTY.
PLEASE DO NOT REMOVE THIS COPYRIGHT BLOCK.
*/
package com.alimuzaffar.ramadanalarm.util;
import android.content.Context;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.TimeZone;
public class PrayTime {
// ---------------------- Global Variables --------------------
private int calcMethod; // caculation method
private int asrJuristic; // Juristic method for Asr
private int dhuhrMinutes; // minutes after mid-day for Dhuhr
private int adjustHighLats; // adjusting method for higher latitudes
private int timeFormat; // time format
private double lat; // latitude
private double lng; // longitude
private double timeZone; // time-zone
private double JDate; // Julian date
// ------------------------------------------------------------
// Calculation Methods
public static final int JAFARI = 0; // Ithna Ashari
public static final int KARACHI = 1; // University of Islamic Sciences, KARACHI
public static final int ISNA = 2; // Islamic Society of North America (ISNA)
public static final int MWL = 3; // Muslim World League (MWL)
public static final int MAKKAH = 4; // Umm al-Qura, MAKKAH
public static final int EGYPT = 5; // Egyptian General Authority of Survey
public static final int CUSTOM = 7; // CUSTOM Setting
public static final int TEHRAN = 6; // Institute of Geophysics, University of TEHRAN
// Juristic Methods
public static final int SHAFII = 0; // SHAFII (standard)
public static final int HANAFI = 1; // HANAFI
// Adjusting Methods for Higher Latitudes
public static final int NONE = 0; // No adjustment
public static final int MID_NIGHT = 1; // middle of night
public static final int ONE_SEVENTH = 2; // 1/7th of night
public static final int ANGLE_BASED = 3; // angle/60th of night
// Time Formats
public static final int TIME_24 = 0; // 24-hour format
public static final int TIME_12 = 1; // 12-hour format
public static final int TIME_12_NS = 2; // 12-hour format with no suffix
public static final int FLOATING = 3; // floating point number
// Time Names
private ArrayList<String> timeNames;
private String InvalidTime; // The string used for invalid times
// --------------------- Technical Settings --------------------
private int numIterations; // number of iterations needed to compute times
// ------------------- Calc Method Parameters --------------------
private HashMap<Integer, double[]> methodParams;
/*
* this.methodParams[methodNum] = new Array(fa, ms, mv, is, iv);
*
* fa : fajr angle ms : maghrib selector (0 = angle; 1 = minutes after
* sunset) mv : maghrib parameter value (in angle or minutes) is : isha
* selector (0 = angle; 1 = minutes after maghrib) iv : isha parameter value
* (in angle or minutes)
*/
private double[] prayerTimesCurrent;
private int[] offsets;
public PrayTime() {
// Initialize vars
this.setCalcMethod(0);
this.setAsrJuristic(0);
this.setDhuhrMinutes(0);
this.setAdjustHighLats(1);
this.setTimeFormat(0);
// Time Names
timeNames = new ArrayList<String>();
timeNames.add("Fajr");
timeNames.add("Sunrise");
timeNames.add("Dhuhr");
timeNames.add("Asr");
timeNames.add("Sunset");
timeNames.add("Maghrib");
timeNames.add("Isha");
InvalidTime = "-----"; // The string used for invalid times
// --------------------- Technical Settings --------------------
this.setNumIterations(1); // number of iterations needed to compute
// times
// ------------------- Calc Method Parameters --------------------
// Tuning offsets {fajr, sunrise, dhuhr, asr, sunset, maghrib, isha}
offsets = new int[7];
offsets[0] = 0;
offsets[1] = 0;
offsets[2] = 0;
offsets[3] = 0;
offsets[4] = 0;
offsets[5] = 0;
offsets[6] = 0;
/*
*
* fa : fajr angle ms : maghrib selector (0 = angle; 1 = minutes after
* sunset) mv : maghrib parameter value (in angle or minutes) is : isha
* selector (0 = angle; 1 = minutes after maghrib) iv : isha parameter
* value (in angle or minutes)
*/
methodParams = new HashMap<Integer, double[]>();
// JAFARI
double[] Jvalues = {16, 0, 4, 0, 14};
methodParams.put(JAFARI, Jvalues);
// KARACHI
double[] Kvalues = {18, 1, 0, 0, 18};
methodParams.put(KARACHI, Kvalues);
// ISNA
double[] Ivalues = {15, 1, 0, 0, 15};
methodParams.put(ISNA, Ivalues);
// MWL
double[] MWvalues = {18, 1, 0, 0, 17};
methodParams.put(MWL, MWvalues);
// MAKKAH
double[] MKvalues = {18.5, 1, 0, 1, 90};
methodParams.put(MAKKAH, MKvalues);
// EGYPT
double[] Evalues = {19.5, 1, 0, 0, 17.5};
methodParams.put(EGYPT, Evalues);
// TEHRAN
double[] Tvalues = {17.7, 0, 4.5, 0, 14};
methodParams.put(TEHRAN, Tvalues);
// CUSTOM
double[] Cvalues = {18, 1, 0, 0, 17};
methodParams.put(CUSTOM, Cvalues);
}
// ---------------------- Trigonometric Functions -----------------------
// range reduce angle in degrees.
private double fixangle(double a) {
a = a - (360 * (Math.floor(a / 360.0)));
a = a < 0 ? (a + 360) : a;
return a;
}
// range reduce hours to 0..23
private double fixhour(double a) {
a = a - 24.0 * Math.floor(a / 24.0);
a = a < 0 ? (a + 24) : a;
return a;
}
// radian to degree
private double radiansToDegrees(double alpha) {
return ((alpha * 180.0) / Math.PI);
}
// deree to radian
private double DegreesToRadians(double alpha) {
return ((alpha * Math.PI) / 180.0);
}
// degree sin
private double dsin(double d) {
return (Math.sin(DegreesToRadians(d)));
}
// degree cos
private double dcos(double d) {
return (Math.cos(DegreesToRadians(d)));
}
// degree tan
private double dtan(double d) {
return (Math.tan(DegreesToRadians(d)));
}
// degree arcsin
private double darcsin(double x) {
double val = Math.asin(x);
return radiansToDegrees(val);
}
// degree arccos
private double darccos(double x) {
double val = Math.acos(x);
return radiansToDegrees(val);
}
// degree arctan
private double darctan(double x) {
double val = Math.atan(x);
return radiansToDegrees(val);
}
// degree arctan2
private double darctan2(double y, double x) {
double val = Math.atan2(y, x);
return radiansToDegrees(val);
}
// degree arccot
private double darccot(double x) {
double val = Math.atan2(1.0, x);
return radiansToDegrees(val);
}
// ---------------------- Time-Zone Functions -----------------------
// compute local time-zone for a specific date
private double getTimeZone1() {
TimeZone timez = TimeZone.getDefault();
double hoursDiff = (timez.getRawOffset() / 1000.0) / 3600;
return hoursDiff;
}
// compute base time-zone of the system
private double getBaseTimeZone() {
TimeZone timez = TimeZone.getDefault();
double hoursDiff = (timez.getRawOffset() / 1000.0) / 3600;
return hoursDiff;
}
// detect daylight saving in a given date
private double detectDaylightSaving() {
TimeZone timez = TimeZone.getDefault();
double hoursDiff = timez.getDSTSavings();
return hoursDiff;
}
// ---------------------- Julian Date Functions -----------------------
// calculate julian date from a calendar date
private double julianDate(int year, int month, int day) {
if (month <= 2) {
year -= 1;
month += 12;
}
double A = Math.floor(year / 100.0);
double B = 2 - A + Math.floor(A / 4.0);
double JD = Math.floor(365.25 * (year + 4716))
+ Math.floor(30.6001 * (month + 1)) + day + B - 1524.5;
return JD;
}
// convert a calendar date to julian date (second method)
private double calcJD(int year, int month, int day) {
double J1970 = 2440588.0;
Date date = new Date(year, month - 1, day);
double ms = date.getTime(); // # of milliseconds since midnight Jan 1,
// 1970
double days = Math.floor(ms / (1000.0 * 60.0 * 60.0 * 24.0));
return J1970 + days - 0.5;
}
// ---------------------- Calculation Functions -----------------------
// References:
// http://www.ummah.net/astronomy/saltime
// http://aa.usno.navy.mil/faq/docs/SunApprox.html
// compute declination angle of sun and equation of time
private double[] sunPosition(double jd) {
double D = jd - 2451545;
double g = fixangle(357.529 + 0.98560028 * D);
double q = fixangle(280.459 + 0.98564736 * D);
double L = fixangle(q + (1.915 * dsin(g)) + (0.020 * dsin(2 * g)));
// double R = 1.00014 - 0.01671 * [self dcos:g] - 0.00014 * [self dcos:
// (2*g)];
double e = 23.439 - (0.00000036 * D);
double d = darcsin(dsin(e) * dsin(L));
double RA = (darctan2((dcos(e) * dsin(L)), (dcos(L)))) / 15.0;
RA = fixhour(RA);
double EqT = q / 15.0 - RA;
double[] sPosition = new double[2];
sPosition[0] = d;
sPosition[1] = EqT;
return sPosition;
}
// compute equation of time
private double equationOfTime(double jd) {
double eq = sunPosition(jd)[1];
return eq;
}
// compute declination angle of sun
private double sunDeclination(double jd) {
double d = sunPosition(jd)[0];
return d;
}
// compute mid-day (Dhuhr, Zawal) time
private double computeMidDay(double t) {
double T = equationOfTime(this.getJDate() + t);
double Z = fixhour(12 - T);
return Z;
}
// compute time for a given angle G
private double computeTime(double G, double t) {
double D = sunDeclination(this.getJDate() + t);
double Z = computeMidDay(t);
double Beg = -dsin(G) - dsin(D) * dsin(this.getLat());
double Mid = dcos(D) * dcos(this.getLat());
double V = darccos(Beg / Mid) / 15.0;
return Z + (G > 90 ? -V : V);
}
// compute the time of Asr
// SHAFII: step=1, HANAFI: step=2
private double computeAsr(double step, double t) {
double D = sunDeclination(this.getJDate() + t);
double G = -darccot(step + dtan(Math.abs(this.getLat() - D)));
return computeTime(G, t);
}
// ---------------------- Misc Functions -----------------------
// compute the difference between two times
private double timeDiff(double time1, double time2) {
return fixhour(time2 - time1);
}
// -------------------- Interface Functions --------------------
// return prayer times for a given date
private ArrayList<String> getDatePrayerTimes(int year, int month, int day,
double latitude, double longitude, double tZone) {
this.setLat(latitude);
this.setLng(longitude);
this.setTimeZone(tZone);
this.setJDate(julianDate(year, month, day));
double lonDiff = longitude / (15.0 * 24.0);
this.setJDate(this.getJDate() - lonDiff);
return computeDayTimes();
}
// return prayer times for a given date
public ArrayList<String> getPrayerTimes(Calendar date, double latitude,
double longitude, double tZone) {
int year = date.get(Calendar.YEAR);
int month = date.get(Calendar.MONTH);
int day = date.get(Calendar.DATE);
return getDatePrayerTimes(year, month + 1, day, latitude, longitude, tZone);
}
// set custom values for calculation parameters
private void setCustomParams(double[] params) {
for (int i = 0; i < 5; i++) {
if (params[i] == -1) {
params[i] = methodParams.get(this.getCalcMethod())[i];
methodParams.put(CUSTOM, params);
} else {
methodParams.get(CUSTOM)[i] = params[i];
}
}
this.setCalcMethod(CUSTOM);
}
// set the angle for calculating Fajr
public void setFajrAngle(double angle) {
double[] params = {angle, -1, -1, -1, -1};
setCustomParams(params);
}
// set the angle for calculating Maghrib
public void setMaghribAngle(double angle) {
double[] params = {-1, 0, angle, -1, -1};
setCustomParams(params);
}
// set the angle for calculating Isha
public void setIshaAngle(double angle) {
double[] params = {-1, -1, -1, 0, angle};
setCustomParams(params);
}
// set the minutes after Sunset for calculating Maghrib
public void setMaghribMinutes(double minutes) {
double[] params = {-1, 1, minutes, -1, -1};
setCustomParams(params);
}
// set the minutes after Maghrib for calculating Isha
public void setIshaMinutes(double minutes) {
double[] params = {-1, -1, -1, 1, minutes};
setCustomParams(params);
}
// convert double hours to 24h format
public String floatToTime24(double time) {
String result;
if (Double.isNaN(time)) {
return InvalidTime;
}
time = fixhour(time + 0.5 / 60.0); // add 0.5 minutes to round
int hours = (int) Math.floor(time);
double minutes = Math.floor((time - hours) * 60.0);
if ((hours >= 0 && hours <= 9) && (minutes >= 0 && minutes <= 9)) {
result = hours + ":0" + Math.round(minutes);
} else if ((hours >= 0 && hours <= 9)) {
result = hours + ":" + Math.round(minutes);
} else if ((minutes >= 0 && minutes <= 9)) {
result = hours + ":0" + Math.round(minutes);
} else {
result = hours + ":" + Math.round(minutes);
}
return result;
}
// convert double hours to 12h format
public String floatToTime12(double time, boolean noSuffix) {
if (Double.isNaN(time)) {
return InvalidTime;
}
time = fixhour(time + 0.5 / 60); // add 0.5 minutes to round
int hours = (int) Math.floor(time);
double minutes = Math.floor((time - hours) * 60);
String suffix, result;
if (hours >= 12) {
suffix = "pm";
} else {
suffix = "am";
}
hours = ((((hours + 12) - 1) % (12)) + 1);
/*hours = (hours + 12) - 1;
int hrs = (int) hours % 12;
hrs += 1;*/
if ((hours >= 0 && hours <= 9) && (minutes >= 0 && minutes <= 9)) {
result = hours + ":0" + Math.round(minutes);
} else if ((hours >= 0 && hours <= 9)) {
result = hours + ":" + Math.round(minutes);
} else if ((minutes >= 0 && minutes <= 9)) {
result = hours + ":0" + Math.round(minutes);
} else {
result = hours + ":" + Math.round(minutes);
}
if (!noSuffix) {
result += " " + suffix;
}
return result;
}
// convert double hours to 12h format with no suffix
public String floatToTime12NS(double time) {
return floatToTime12(time, true);
}
// ---------------------- Compute Prayer Times -----------------------
// compute prayer times at given julian date
private double[] computeTimes(double[] times) {
double[] t = dayPortion(times);
double Fajr = this.computeTime(
180 - methodParams.get(this.getCalcMethod())[0], t[0]);
double Sunrise = this.computeTime(180 - 0.833, t[1]);
double Dhuhr = this.computeMidDay(t[2]);
double Asr = this.computeAsr(1 + this.getAsrJuristic(), t[3]);
double Sunset = this.computeTime(0.833, t[4]);
double Maghrib = this.computeTime(
methodParams.get(this.getCalcMethod())[2], t[5]);
double Isha = this.computeTime(
methodParams.get(this.getCalcMethod())[4], t[6]);
double[] CTimes = {Fajr, Sunrise, Dhuhr, Asr, Sunset, Maghrib, Isha};
return CTimes;
}
// compute prayer times at given julian date
private ArrayList<String> computeDayTimes() {
double[] times = {5, 6, 12, 13, 18, 18, 18}; // default times
for (int i = 1; i <= this.getNumIterations(); i++) {
times = computeTimes(times);
}
times = adjustTimes(times);
times = tuneTimes(times);
return adjustTimesFormat(times);
}
// adjust times in a prayer time array
private double[] adjustTimes(double[] times) {
for (int i = 0; i < times.length; i++) {
times[i] += this.getTimeZone() - this.getLng() / 15;
}
times[2] += this.getDhuhrMinutes() / 60; // Dhuhr
if (methodParams.get(this.getCalcMethod())[1] == 1) // Maghrib
{
times[5] = times[4] + methodParams.get(this.getCalcMethod())[2] / 60;
}
if (methodParams.get(this.getCalcMethod())[3] == 1) // Isha
{
times[6] = times[5] + methodParams.get(this.getCalcMethod())[4] / 60;
}
if (this.getAdjustHighLats() != NONE) {
times = adjustHighLatTimes(times);
}
return times;
}
// convert times array to given time format
private ArrayList<String> adjustTimesFormat(double[] times) {
ArrayList<String> result = new ArrayList<String>();
if (this.getTimeFormat() == FLOATING) {
for (double time : times) {
result.add(String.valueOf(time));
}
return result;
}
for (int i = 0; i < 7; i++) {
if (this.getTimeFormat() == TIME_12) {
result.add(floatToTime12(times[i], false));
} else if (this.getTimeFormat() == TIME_12_NS) {
result.add(floatToTime12(times[i], true));
} else {
result.add(floatToTime24(times[i]));
}
}
return result;
}
// adjust Fajr, Isha and Maghrib for locations in higher latitudes
private double[] adjustHighLatTimes(double[] times) {
double nightTime = timeDiff(times[4], times[1]); // sunset to sunrise
// Adjust Fajr
double FajrDiff = nightPortion(methodParams.get(this.getCalcMethod())[0]) * nightTime;
if (Double.isNaN(times[0]) || timeDiff(times[0], times[1]) > FajrDiff) {
times[0] = times[1] - FajrDiff;
}
// Adjust Isha
double IshaAngle = (methodParams.get(this.getCalcMethod())[3] == 0) ? methodParams.get(this.getCalcMethod())[4] : 18;
double IshaDiff = this.nightPortion(IshaAngle) * nightTime;
if (Double.isNaN(times[6]) || this.timeDiff(times[4], times[6]) > IshaDiff) {
times[6] = times[4] + IshaDiff;
}
// Adjust Maghrib
double MaghribAngle = (methodParams.get(this.getCalcMethod())[1] == 0) ? methodParams.get(this.getCalcMethod())[2] : 4;
double MaghribDiff = nightPortion(MaghribAngle) * nightTime;
if (Double.isNaN(times[5]) || this.timeDiff(times[4], times[5]) > MaghribDiff) {
times[5] = times[4] + MaghribDiff;
}
return times;
}
// the night portion used for adjusting times in higher latitudes
private double nightPortion(double angle) {
double calc = 0;
if (adjustHighLats == ANGLE_BASED)
calc = (angle) / 60.0;
else if (adjustHighLats == MID_NIGHT)
calc = 0.5;
else if (adjustHighLats == ONE_SEVENTH)
calc = 0.14286;
return calc;
}
// convert hours to day portions
private double[] dayPortion(double[] times) {
for (int i = 0; i < 7; i++) {
times[i] /= 24;
}
return times;
}
// Tune timings for adjustments
// Set time offsets
public void tune(int[] offsetTimes) {
for (int i = 0; i < offsetTimes.length; i++) { // offsetTimes length
// should be 7 in order
// of Fajr, Sunrise,
// Dhuhr, Asr, Sunset,
// Maghrib, Isha
this.offsets[i] = offsetTimes[i];
}
}
private double[] tuneTimes(double[] times) {
for (int i = 0; i < times.length; i++) {
times[i] = times[i] + this.offsets[i] / 60.0;
}
return times;
}
/**
* @param args
*/
public static void main(String[] args) {
double latitude = -33.8736779;
double longitude = 151.196515;
//Get NY time zone instance
TimeZone defaultTz = TimeZone.getDefault();
//Get NY calendar object with current date/time
Calendar defaultCalc = Calendar.getInstance(defaultTz);
//Get offset from UTC, accounting for DST
int defaultTzOffsetMs = defaultCalc.get(Calendar.ZONE_OFFSET) + defaultCalc.get(Calendar.DST_OFFSET);
double timezone = defaultTzOffsetMs / (1000 * 60 * 60);
// Test Prayer times here
PrayTime prayers = new PrayTime();
prayers.setTimeFormat(prayers.TIME_12);
prayers.setCalcMethod(prayers.KARACHI);
prayers.setAsrJuristic(prayers.SHAFII);
prayers.setAdjustHighLats(prayers.ANGLE_BASED);
int[] offsets = {0, 0, 0, 0, 0, 0, 0}; // {Fajr,Sunrise,Dhuhr,Asr,Sunset,Maghrib,Isha}
prayers.tune(offsets);
Date now = new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(now);
ArrayList<String> prayerTimes = prayers.getPrayerTimes(cal,
latitude, longitude, timezone);
ArrayList<String> prayerNames = prayers.getTimeNames();
for (int i = 0; i < prayerTimes.size(); i++) {
System.out.println(prayerNames.get(i) + " - " + prayerTimes.get(i));
}
}
public static LinkedHashMap<String, String> getPrayerTimes(Context context, int index, double lat, double lng) {
return getPrayerTimes(context, index, lat, lng, -1);
}
public static LinkedHashMap<String, String> getPrayerTimes(Context context, int index, double lat, double lng, int timeFormat) {
AppSettings settings = AppSettings.getInstance(context);
double latitude = lat;
double longitude = lng;
//Get time zone instance
TimeZone defaultTz = TimeZone.getDefault();
//Get calendar object with current date/time
Calendar defaultCalc = Calendar.getInstance(defaultTz);
//Get offset from UTC, accounting for DST
int defaultTzOffsetMs = defaultCalc.get(Calendar.ZONE_OFFSET) + defaultCalc.get(Calendar.DST_OFFSET);
double timezone = defaultTzOffsetMs / (1000 * 60 * 60);
// Test Prayer times here
PrayTime prayers = new PrayTime();
if (timeFormat == -1) {
prayers.setTimeFormat(settings.getTimeFormatFor(index));
} else {
prayers.setTimeFormat(timeFormat);
}
prayers.setCalcMethod(settings.getCalcMethodSetFor(index));
prayers.setAsrJuristic(settings.getAsrMethodSetFor(index));
prayers.setAdjustHighLats(settings.getHighLatitudeAdjustmentFor(index));
int[] offsets = {0, 0, 0, 0, 0, 0, 0}; // {Fajr,Sunrise,Dhuhr,Asr,Sunset,Maghrib,Isha}
prayers.tune(offsets);
Date now = new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(now);
ArrayList<String> prayerTimes = prayers.getPrayerTimes(cal,
latitude, longitude, timezone);
ArrayList<String> prayerNames = prayers.getTimeNames();
LinkedHashMap<String, String> result = new LinkedHashMap<>();
for (int i = 0; i < prayerTimes.size(); i++) {
System.out.println(prayerNames.get(i) + " - " + prayerTimes.get(i));
result.put(prayerNames.get(i), prayerTimes.get(i));
}
return result;
}
public int getCalcMethod() {
return calcMethod;
}
public void setCalcMethod(int calcMethod) {
this.calcMethod = calcMethod;
}
public int getAsrJuristic() {
return asrJuristic;
}
public void setAsrJuristic(int asrJuristic) {
this.asrJuristic = asrJuristic;
}
public int getDhuhrMinutes() {
return dhuhrMinutes;
}
public void setDhuhrMinutes(int dhuhrMinutes) {
this.dhuhrMinutes = dhuhrMinutes;
}
public int getAdjustHighLats() {
return adjustHighLats;
}
public void setAdjustHighLats(int adjustHighLats) {
this.adjustHighLats = adjustHighLats;
}
public int getTimeFormat() {
return timeFormat;
}
public void setTimeFormat(int timeFormat) {
this.timeFormat = timeFormat;
}
public double getLat() {
return lat;
}
public void setLat(double lat) {
this.lat = lat;
}
public double getLng() {
return lng;
}
public void setLng(double lng) {
this.lng = lng;
}
public double getTimeZone() {
return timeZone;
}
public void setTimeZone(double timeZone) {
this.timeZone = timeZone;
}
public double getJDate() {
return JDate;
}
public void setJDate(double jDate) {
JDate = jDate;
}
private int getNumIterations() {
return numIterations;
}
private void setNumIterations(int numIterations) {
this.numIterations = numIterations;
}
public ArrayList<String> getTimeNames() {
return timeNames;
}
}
