uk.ac.starlink.ttools.func

Class TrigDegrees

java.lang.Object

uk.ac.starlink.ttools.func.TrigDegrees

public class TrigDegrees
extends Object

Standard trigonometric functions with angles in degrees.

Since:

2 Sep 2004

Author:

Mark Taylor (Starlink)

Method Summary

Modifier and Type	Method and Description
static double	acosDeg(double x) Arc cosine.
static double	asinDeg(double x) Arc sine.
static double	atan2Deg(double y, double x) Converts rectangular coordinates (x,y) to polar (r,theta).
static double	atanDeg(double x) Arc tangent.
static double	cosDeg(double theta) Cosine of an angle.
static double	sinDeg(double theta) Sine of an angle.
static double	tanDeg(double theta) Tangent of an angle.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

sinDeg

public static double sinDeg(double theta)

Sine of an angle.

Parameters:

theta - an angle, in degrees

Returns:

the sine of the argument

cosDeg

public static double cosDeg(double theta)

Cosine of an angle.

Parameters:

theta - an angle, in degrees

Returns:

the cosine of the argument

tanDeg

public static double tanDeg(double theta)

Tangent of an angle.

Parameters:

theta - an angle, in degrees

Returns:

the tangent of the argument.

asinDeg

public static double asinDeg(double x)

Arc sine. The result is in the range of -90 through 90.

Parameters:

x - the value whose arc sine is to be returned.

Returns:

the arc sine of the argument in degrees

acosDeg

public static double acosDeg(double x)

Arc cosine. The result is in the range of 0.0 through 180.

Parameters:

x - the value whose arc cosine is to be returned.

Returns:

the arc cosine of the argument in degrees

atanDeg

public static double atanDeg(double x)

Arc tangent. The result is in the range of -90 through 90.

Parameters:

x - the value whose arc tangent is to be returned.

Returns:

the arc tangent of the argument in degrees

atan2Deg

public static double atan2Deg(double y,
                              double x)

Converts rectangular coordinates (x,y) to polar (r,theta). This method computes the phase theta by computing an arc tangent of y/x in the range of -180 to 180.

Parameters:

y - the ordinate coordinate

x - the abscissa coordinate

Returns:

the theta component in degrees of the point (r,theta) in polar coordinates that corresponds to the point (x,y) in Cartesian coordinates.