java.lang.Object
- org.locationtech.proj4j.util.ProjectionMath

public class ProjectionMath
extends java.lang.Object

Field Summary

Fields
Modifier and Type	Field	Description
`private static double`	`C00`
`private static double`	`C02`
`private static double`	`C04`
`private static double`	`C06`
`private static double`	`C08`
`private static double`	`C22`
`private static double`	`C44`
`private static double`	`C46`
`private static double`	`C48`
`private static double`	`C66`
`private static double`	`C68`
`private static double`	`C88`
`static double`	`DTR`
`static double`	`EPS10`
`static double`	`FORTPI`
`static double`	`HALFPI`
`private static int`	`MAX_ITER`
`static double`	`MILLION`
`private static int`	`N_ITER`
`private static double`	`P00`
`private static double`	`P01`
`private static double`	`P02`
`private static double`	`P10`
`private static double`	`P11`
`private static double`	`P20`
`static double`	`PI`
`static double`	`QUARTERPI`
`static double`	`RTD`
`static double`	`SECONDS_TO_RAD`
`static double`	`TWOPI`

Constructor Summary

Constructors
Constructor Description

ProjectionMath()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static double`	`acos(double v)`
`static double`	`acosd(double v)`
`static double`	`asin(double v)`
`static double`	`asind(double v)`
`static double`	`atan2(double y, double x)`
`static double`	`atan2d(double y, double x)`
`static double`	`atand(double v)`
`static double`	`authlat(double beta, double[] APA)`
`static double[]`	`authset(double es)`
`static double`	`cosd(double v)`
`static double`	`cross(double x1, double y1, double x2, double y2)`
`static double`	`degToRad(double v)`
`static double`	`distance(double dx, double dy)`
`static double`	`dmsToDeg(double d, double m, double s)`
`static double`	`dmsToRad(double d, double m, double s)`
`static double[]`	`enfn(double es)`
`static double`	`frac(double v)`
`static double`	`geocentricLatitude(double lat, double flatness)`
`static double`	`geographicLatitude(double lat, double flatness)`
`static double`	`greatCircleDistance(double lon1, double lat1, double lon2, double lat2)`
`static double`	`hypot(double x, double y)`
`static double`	`inv_mlfn(double arg, double es, double[] en)`
`static boolean`	`isIdentity(double[] transform)`	Tests whether the datum parameter-based transform is the identity transform (in which case datum transformation can be short-circuited, thus avoiding some loss of numerical precision).
`static double`	`longitudeDistance(double l1, double l2)`
`static double`	`mlfn(double phi, double sphi, double cphi, double[] en)`
`static double`	`msfn(double sinphi, double cosphi, double es)`
`static double`	`niceNumber(double x, boolean round)`
`static double`	`normalizeAngle(double angle)`
`static double`	`normalizeLatitude(double angle)`
`static double`	`normalizeLongitude(double angle)`
`static double`	`phi2(double ts, double e)`
`static double`	`qsfn(double sinphi, double e, double one_es)`
`static double`	`radToDeg(double v)`
`static boolean`	`sameSigns(double a, double b)`
`static boolean`	`sameSigns(int a, int b)`
`static double`	`sind(double v)`	Degree versions of trigonometric functions
`static double`	`sphericalAzimuth(double lat0, double lon0, double lat, double lon)`
`static double`	`sqrt(double v)`
`static double`	`takeSign(double a, double b)`
`static int`	`takeSign(int a, int b)`
`static double`	`tand(double v)`
`static double`	`trunc(double v)`
`static double`	`tsfn(double phi, double sinphi, double e)`
`static Complex`	`zpoly1(Complex z, Complex[] c)`	Evaluate complex polynomial.
`static Complex`	`zpoly1d(Complex z, Complex[] C, Complex der)`	Evaluate a complex polynomial and its derivative

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- PI
```
public static final double PI
```
  See Also:
  
  Constant Field Values
- HALFPI
```
public static final double HALFPI
```
  See Also:
  
  Constant Field Values
- QUARTERPI
```
public static final double QUARTERPI
```
  See Also:
  
  Constant Field Values
- FORTPI
```
public static final double FORTPI
```
  See Also:
  
  Constant Field Values
- TWOPI
```
public static final double TWOPI
```
  See Also:
  
  Constant Field Values
- RTD
```
public static final double RTD
```
  See Also:
  
  Constant Field Values
- DTR
```
public static final double DTR
```
  See Also:
  
  Constant Field Values
- EPS10
```
public static final double EPS10
```
  See Also:
  
  Constant Field Values
- N_ITER
```
private static final int N_ITER
```
  See Also:
  
  Constant Field Values
- C00
```
private static final double C00
```
  See Also:
  
  Constant Field Values
- C02
```
private static final double C02
```
  See Also:
  
  Constant Field Values
- C04
```
private static final double C04
```
  See Also:
  
  Constant Field Values
- C06
```
private static final double C06
```
  See Also:
  
  Constant Field Values
- C08
```
private static final double C08
```
  See Also:
  
  Constant Field Values
- C22
```
private static final double C22
```
  See Also:
  
  Constant Field Values
- C44
```
private static final double C44
```
  See Also:
  
  Constant Field Values
- C46
```
private static final double C46
```
  See Also:
  
  Constant Field Values
- C48
```
private static final double C48
```
  See Also:
  
  Constant Field Values
- C66
```
private static final double C66
```
  See Also:
  
  Constant Field Values
- C68
```
private static final double C68
```
  See Also:
  
  Constant Field Values
- C88
```
private static final double C88
```
  See Also:
  
  Constant Field Values
- MAX_ITER
```
private static final int MAX_ITER
```
  See Also:
  
  Constant Field Values
- P00
```
private static final double P00
```
  See Also:
  
  Constant Field Values
- P01
```
private static final double P01
```
  See Also:
  
  Constant Field Values
- P02
```
private static final double P02
```
  See Also:
  
  Constant Field Values
- P10
```
private static final double P10
```
  See Also:
  
  Constant Field Values
- P11
```
private static final double P11
```
  See Also:
  
  Constant Field Values
- P20
```
private static final double P20
```
  See Also:
  
  Constant Field Values
- SECONDS_TO_RAD
```
public static final double SECONDS_TO_RAD
```
  See Also:
  
  Constant Field Values
- MILLION
```
public static final double MILLION
```
  See Also:
  
  Constant Field Values

Constructor Detail
- ProjectionMath
```
public ProjectionMath()
```

Method Detail

sind
```
public static double sind(double v)
```
Degree versions of trigonometric functions

cosd

public static double cosd(double v)

tand

public static double tand(double v)

asind

public static double asind(double v)

acosd

public static double acosd(double v)

atand

public static double atand(double v)

atan2d

public static double atan2d(double y,
                            double x)

asin

public static double asin(double v)

acos

public static double acos(double v)

sqrt

public static double sqrt(double v)

distance

public static double distance(double dx,
                              double dy)

hypot

public static double hypot(double x,
                           double y)

atan2

public static double atan2(double y,
                           double x)

trunc

public static double trunc(double v)

frac

public static double frac(double v)

degToRad

public static double degToRad(double v)

radToDeg

public static double radToDeg(double v)

dmsToRad

public static double dmsToRad(double d,
                              double m,
                              double s)

dmsToDeg

public static double dmsToDeg(double d,
                              double m,
                              double s)

normalizeLatitude

public static double normalizeLatitude(double angle)

normalizeLongitude

public static double normalizeLongitude(double angle)

normalizeAngle

public static double normalizeAngle(double angle)

greatCircleDistance

public static double greatCircleDistance(double lon1,
                                         double lat1,
                                         double lon2,
                                         double lat2)

sphericalAzimuth

public static double sphericalAzimuth(double lat0,
                                      double lon0,
                                      double lat,
                                      double lon)

sameSigns

public static boolean sameSigns(double a,
                                double b)

sameSigns

public static boolean sameSigns(int a,
                                int b)

takeSign

public static double takeSign(double a,
                              double b)

takeSign

public static int takeSign(int a,
                           int b)

cross

public static double cross(double x1,
                           double y1,
                           double x2,
                           double y2)

longitudeDistance

public static double longitudeDistance(double l1,
                                       double l2)

geocentricLatitude

public static double geocentricLatitude(double lat,
                                        double flatness)

geographicLatitude

public static double geographicLatitude(double lat,
                                        double flatness)

tsfn

public static double tsfn(double phi,
                          double sinphi,
                          double e)

msfn

public static double msfn(double sinphi,
                          double cosphi,
                          double es)

phi2

public static double phi2(double ts,
                          double e)

enfn

public static double[] enfn(double es)

mlfn

public static double mlfn(double phi,
                          double sphi,
                          double cphi,
                          double[] en)

inv_mlfn

public static double inv_mlfn(double arg,
                              double es,
                              double[] en)

authset

public static double[] authset(double es)

authlat

public static double authlat(double beta,
                             double[] APA)

qsfn

public static double qsfn(double sinphi,
                          double e,
                          double one_es)

niceNumber

public static double niceNumber(double x,
                                boolean round)

zpoly1

public static Complex zpoly1(Complex z,
                             Complex[] c)

Evaluate complex polynomial. Note coefficients are always C[1] to C[n], C[0] is always (0,0).

zpoly1d

public static Complex zpoly1d(Complex z,
                              Complex[] C,
                              Complex der)

Evaluate a complex polynomial and its derivative

isIdentity
```
public static boolean isIdentity(double[] transform)
```
Tests whether the datum parameter-based transform is the identity transform (in which case datum transformation can be short-circuited, thus avoiding some loss of numerical precision).

Parameters:

transform -

Returns:

Class ProjectionMath

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

PI

HALFPI

QUARTERPI

FORTPI

TWOPI

RTD

DTR

EPS10

N_ITER

C00

C02

C04

C06

C08

C22

C44

C46

C48

C66

C68

C88

MAX_ITER

P00

P01

P02

P10

P11

P20

SECONDS_TO_RAD

MILLION

Constructor Detail

ProjectionMath

Method Detail

sind

cosd

tand

asind

acosd

atand

atan2d

asin

acos

sqrt

distance

hypot

atan2

trunc

frac

degToRad

radToDeg

dmsToRad

dmsToDeg

normalizeLatitude

normalizeLongitude

normalizeAngle

greatCircleDistance

sphericalAzimuth

sameSigns

sameSigns

takeSign

takeSign

cross

longitudeDistance

geocentricLatitude

geographicLatitude

tsfn

msfn

phi2

enfn

mlfn

inv_mlfn

authset

authlat

qsfn