java.lang.Object
- ucar.unidata.geoloc.projection.proj4.MapMath

```
public class MapMath
extends Object
```
Taken from com.jhlabs.map.proj Also see "http://search.cpan.org/src/DSTAHLKE/Cartography-Projection-GCTP-0.03/gctpc/" for C code

Since:

Oct 8, 2009

See Also:

"http://www.jhlabs.com/java/maps/proj/index.html", "http://trac.osgeo.org/proj/"

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`COLLINEAR`
`static int`	`DO_INTERSECT`
`static int`	`DONT_INTERSECT`
`static double`	`DTR`
`static double`	`EPS10`
`static double`	`HALFPI`
`static double`	`QUARTERPI`
`static double`	`RTD`
`static double`	`TWOPI`
`static ProjectionRect`	`WORLD_BOUNDS`
`static ProjectionRect`	`WORLD_BOUNDS_RAD`

Constructor Summary

Constructors
Constructor Description

MapMath()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static double`	`acos(double v)`
`static double`	`acosd(double v)`
`static ProjectionPoint`	`add(ProjectionPoint a, ProjectionPoint b)`
`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`	`cross(ProjectionPoint a, ProjectionPoint b)`
`static double`	`degToRad(double v)`
`static double`	`distance(double dx, double dy)`
`static double`	`distance(ProjectionPoint a, ProjectionPoint b)`
`static double`	`dmsToDeg(double d, double m, double s)`
`static double`	`dmsToRad(double d, double m, double s)`
`static double`	`dot(ProjectionPoint a, ProjectionPoint b)`
`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 int`	`intersectSegments(ProjectionPoint aStart, ProjectionPoint aEnd, ProjectionPoint bStart, ProjectionPoint bEnd, ProjectionPointImpl p)`
`static double`	`inv_mlfn(double arg, double es, double[] en)`
`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 ProjectionPoint`	`multiply(ProjectionPoint a, ProjectionPoint b)`
`static void`	`negate(ProjectionPointImpl a)`
`static double`	`niceNumber(double x, boolean round)`
`static void`	`normalize(ProjectionPointImpl a)`
`static double`	`normalizeAngle(double angle)`
`static double`	`normalizeLatitude(double angle)`
`static double`	`normalizeLongitude(double angle)`
`static ProjectionPoint`	`perpendicular(ProjectionPoint a)`
`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 ProjectionPoint`	`subtract(ProjectionPoint a, ProjectionPoint b)`
`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)`

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

Field Detail

HALFPI
```
public static final double HALFPI
```
See Also:

Constant Field Values

QUARTERPI
```
public static final double QUARTERPI
```
See Also:

Constant Field Values

TWOPI
```
public static final double TWOPI
```
See Also:

Constant Field Values

WORLD_BOUNDS_RAD

public static final ProjectionRect WORLD_BOUNDS_RAD

WORLD_BOUNDS

public static final ProjectionRect WORLD_BOUNDS

EPS10
```
public static final double EPS10
```
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

DONT_INTERSECT
```
public static final int DONT_INTERSECT
```
See Also:

Constant Field Values

DO_INTERSECT
```
public static final int DO_INTERSECT
```
See Also:

Constant Field Values

COLLINEAR
```
public static final int COLLINEAR
```
See Also:

Constant Field Values

Constructor Detail
- MapMath
```
public MapMath()
```

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)

distance

public static double distance(ProjectionPoint a,
                              ProjectionPoint b)

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)

intersectSegments

public static int intersectSegments(ProjectionPoint aStart,
                                    ProjectionPoint aEnd,
                                    ProjectionPoint bStart,
                                    ProjectionPoint bEnd,
                                    ProjectionPointImpl p)

dot

public static double dot(ProjectionPoint a,
                         ProjectionPoint b)

perpendicular

public static ProjectionPoint perpendicular(ProjectionPoint a)

add

public static ProjectionPoint add(ProjectionPoint a,
                                  ProjectionPoint b)

subtract

public static ProjectionPoint subtract(ProjectionPoint a,
                                       ProjectionPoint b)

multiply

public static ProjectionPoint multiply(ProjectionPoint a,
                                       ProjectionPoint b)

cross

public static double cross(ProjectionPoint a,
                           ProjectionPoint b)

cross

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

normalize

public static void normalize(ProjectionPointImpl a)

negate

public static void negate(ProjectionPointImpl a)

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)

Class MapMath

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

HALFPI

QUARTERPI

TWOPI

WORLD_BOUNDS_RAD

WORLD_BOUNDS

EPS10

RTD

DTR

DONT_INTERSECT

DO_INTERSECT

COLLINEAR

Constructor Detail

MapMath

Method Detail

sind

cosd

tand

asind

acosd

atand

atan2d

asin

acos

sqrt

distance

distance

hypot

atan2

trunc

frac

degToRad

radToDeg

dmsToRad

dmsToDeg

normalizeLatitude

normalizeLongitude

normalizeAngle

greatCircleDistance

sphericalAzimuth

sameSigns

sameSigns

takeSign

takeSign

intersectSegments

dot

perpendicular

add

subtract

multiply

cross

cross

normalize

negate

longitudeDistance

geocentricLatitude

geographicLatitude

tsfn

msfn

phi2

enfn

mlfn

inv_mlfn

authset

authlat

qsfn

niceNumber