Package skyview.geometry
Class CoordinateSystem
- java.lang.Object
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- skyview.geometry.CoordinateSystem
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- All Implemented Interfaces:
java.io.Serializable
,Component
public abstract class CoordinateSystem extends java.lang.Object implements Component
The class defines coordinate systems in terms of the operations needed to transform the standard coordinate system (currently J2000) to the coordinate system associated with the object. Most coordinate systems will be defined as simple rotations, but some coordinate systems may involve more complext transformations. A factory method is available to generate Coordinate systems from a given string. Typically a string is comprised of an initial and an epoch (e.g., "B1950", "J1975.5"). Any string beginning with "G" is assumed to be Galactic coordinates.- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description static CoordinateSystem
B1950
Standard B1950 coordinatesstatic CoordinateSystem
Gal
Standard Galactic coordinatesstatic CoordinateSystem
ICRS
Standard ICRS coordinatesstatic CoordinateSystem
J2000
Standard J2000 coordinates -- the reference frame
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Constructor Summary
Constructors Constructor Description CoordinateSystem()
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description static CoordinateSystem
factory(java.lang.String name)
Get a coordinate system by name.static CoordinateSystem
factory(java.lang.String name, java.lang.String equinox)
abstract Rotater
getRotater()
Get the rotation associated with the projection.SphereDistorter
getSphereDistorter()
Get the distortion associated with the projection.-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface skyview.Component
getDescription, getName
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Field Detail
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J2000
public static final CoordinateSystem J2000
Standard J2000 coordinates -- the reference frame
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B1950
public static final CoordinateSystem B1950
Standard B1950 coordinates
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Gal
public static final CoordinateSystem Gal
Standard Galactic coordinates
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ICRS
public static final CoordinateSystem ICRS
Standard ICRS coordinates
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Method Detail
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getRotater
public abstract Rotater getRotater()
Get the rotation associated with the projection.
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getSphereDistorter
public SphereDistorter getSphereDistorter()
Get the distortion associated with the projection. By default there is no distortion, but subclasses, notably BesselianProjection, can override this.
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factory
public static CoordinateSystem factory(java.lang.String name)
Get a coordinate system by name.- Parameters:
name
- A designation of the desired coordinate system. Normally the name is an initial designating the general frame and orientation of the coordinate system followed by an epoch of equinox, e.g., J2000, B1950 E2000.45. The initial letters are:- J
- Julian Equatorial Coordinates.
- B
- Besselian Equatorial Coordinates.
- E
- Julian Ecliptic Coordinates
- H
- Helioecliptic coordinates.
- G
- Galactic coordinates. Only the first letter is parsed.
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factory
public static CoordinateSystem factory(java.lang.String name, java.lang.String equinox)
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