skyview.geometry
Class Projection

java.lang.Object
  skyview.geometry.Projection

public class Projection
extends java.lang.Object

This class implements projection algorithms to/from a projection plane and the unit sphere. Data on the unit sphere is normally represented as a unit-three vector. Data in a projection plane is normally represented as a two-ple. Note that the projection is usually broken into two pieces: a transformation to a convenient location on the celestial sphere (e.g., for a TAN projection, the unit vectors are rotated so that the reference pixel is at the pole), and a functional transformation from the sphere to the plane. The project and deproject functions address this later element, while the rotation needed is encoded in in the eulerRotationMatrix.

Constructor Summary

Projection(java.lang.String type)
Get the correct projection

Projection(java.lang.String type, double[] reference)
Create the specified projection.

Method Summary

Distorter	getDistorter() Get any distortion in the plane associated with this projection.
Projecter	getProjecter() Get the projection algorithm associated with this rotation.
Rotater	getRotater() Get the rotation that needs to be performed before the rotation.
protected void	setDistorter(Distorter dist)
void	setRotater(Rotater rot) Update the Rotater...
protected double[]	specialReference()

Methods inherited from class java.lang.Object

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

Constructor Detail

Projection

public Projection(java.lang.String type)
           throws TransformationException

Get the correct projection

Throws:

TransformationException

Projection

public Projection(java.lang.String type,
                  double[] reference)
           throws TransformationException

Create the specified projection.

Parameters:

type - The three character string defining the projection.

reference - The reference point for the projection (as a coordinate pair)

Throws:

TransformationException

Method Detail

getRotater

public Rotater getRotater()

Get the rotation that needs to be performed before the rotation.

setRotater

public void setRotater(Rotater rot)

Update the Rotater...

getProjecter

public Projecter getProjecter()

Get the projection algorithm associated with this rotation.

getDistorter

public Distorter getDistorter()

Get any distortion in the plane associated with this projection.

setDistorter

protected void setDistorter(Distorter dist)

specialReference

protected double[] specialReference()