56 lines
2.4 KiB
Java
56 lines
2.4 KiB
Java
package androidx.appcompat.app;
|
|
public class TwilightCalculator {
|
|
private static final float ALTIDUTE_CORRECTION_CIVIL_TWILIGHT = -0.10471976f;
|
|
private static final float C1 = 0.0334196f;
|
|
private static final float C2 = 3.49066E-4f;
|
|
private static final float C3 = 5.236E-6f;
|
|
public static final int DAY = 0;
|
|
private static final float DEGREES_TO_RADIANS = 0.017453292f;
|
|
private static final float J0 = 9.0E-4f;
|
|
public static final int NIGHT = 1;
|
|
private static final float OBLIQUITY = 0.4092797f;
|
|
private static final long UTC_2000 = 946728000000L;
|
|
private static TwilightCalculator sInstance;
|
|
public int state;
|
|
public long sunrise;
|
|
public long sunset;
|
|
|
|
public static TwilightCalculator getInstance() {
|
|
if (sInstance == null) {
|
|
sInstance = new TwilightCalculator();
|
|
}
|
|
return sInstance;
|
|
}
|
|
|
|
public void calculateTwilight(long j, double d, double d2) {
|
|
float f = ((float) (j - UTC_2000)) / 8.64E7f;
|
|
float f2 = (0.01720197f * f) + 6.24006f;
|
|
double d3 = (double) f2;
|
|
double sin = (Math.sin((double) (f2 * 3.0f)) * 5.236000106378924E-6d) + (Math.sin((double) (2.0f * f2)) * 3.4906598739326E-4d) + (Math.sin(d3) * 0.03341960161924362d) + d3 + 1.796593063d + 3.141592653589793d;
|
|
double d4 = (-d2) / 360.0d;
|
|
double sin2 = (Math.sin(2.0d * sin) * -0.0069d) + (Math.sin(d3) * 0.0053d) + ((double) (((float) Math.round(((double) (f - J0)) - d4)) + J0)) + d4;
|
|
double asin = Math.asin(Math.sin(0.4092797040939331d) * Math.sin(sin));
|
|
double d5 = 0.01745329238474369d * d;
|
|
double sin3 = (Math.sin(-0.10471975803375244d) - (Math.sin(asin) * Math.sin(d5))) / (Math.cos(asin) * Math.cos(d5));
|
|
if (sin3 >= 1.0d) {
|
|
this.state = 1;
|
|
this.sunset = -1;
|
|
this.sunrise = -1;
|
|
} else if (sin3 <= -1.0d) {
|
|
this.state = 0;
|
|
this.sunset = -1;
|
|
this.sunrise = -1;
|
|
} else {
|
|
double acos = (double) ((float) (Math.acos(sin3) / 6.283185307179586d));
|
|
this.sunset = Math.round((sin2 + acos) * 8.64E7d) + UTC_2000;
|
|
long round = Math.round((sin2 - acos) * 8.64E7d) + UTC_2000;
|
|
this.sunrise = round;
|
|
if (round >= j || this.sunset <= j) {
|
|
this.state = 1;
|
|
} else {
|
|
this.state = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|