Package skyview.geometry.projecter

Class Ait

java.lang.Object

skyview.geometry.Transformer

skyview.geometry.Projecter

skyview.geometry.projecter.Ait

All Implemented Interfaces:

java.io.Serializable, Component

public class Ait
extends Projecter

This class implements the AIT (Hammer-Aitov) projection. This version uses only the Math.sqrt function without any calls to trigonometric functions.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	Ait.AitDeproj

Constructor Summary

Constructors

Constructor	Description
Ait()

Method Summary

Modifier and Type	Method	Description
static void	forwardTransform(double[] sphere, double[] plane)
java.lang.String	getDescription()	A description of the component
java.lang.String	getName()	The name of the Component
Deprojecter	inverse()	Get the associated deprojecter
boolean	isInverse(Transformer trans)	Is this the inverse of another transformation?
static void	main(java.lang.String[] args)
static void	reverseTransform(double[] plane, double[] sphere)
double[]	shadowPoint(double x, double y)	Find the shadow point for the given element.
boolean	straddle(double[][] pnts)	Does this figure straddle the boundary.
boolean	straddleable()	Is it possible for a pixel to straddle the valid region.
double[][][]	straddleComponents(double[][] input)	Get the straddle regions from a given set.
void	transform(double[] sphere, double[] plane)	Convert a single point where the output vector is supplied.
boolean	validPosition(double[] plane)	Is this a valid position in the projection plane for this image.

Methods inherited from class skyview.geometry.Projecter

allValid, getInputDimension, getOutputDimension, getXTiling, getYTiling, tissot

Methods inherited from class skyview.geometry.Transformer

transform, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

Ait

public Ait()

Method Detail

getName

public java.lang.String getName()

The name of the Component

getDescription

public java.lang.String getDescription()

A description of the component

inverse

public Deprojecter inverse()

Get the associated deprojecter

Specified by:

inverse in class Projecter

isInverse

public boolean isInverse(Transformer trans)

Is this the inverse of another transformation?

Specified by:

isInverse in class Transformer

transform

public final void transform(double[] sphere,
                            double[] plane)

Description copied from class: Transformer

Convert a single point where the output vector is supplied.

Specified by:

transform in class Transformer

Parameters:

sphere - The input vector.

plane - The output vector, it may be the same as the input vector if the dimensionalities are the same. All transformers are expected to work with aliased inputs and output.

forwardTransform

public static void forwardTransform(double[] sphere,
                                    double[] plane)

reverseTransform

public static void reverseTransform(double[] plane,
                                    double[] sphere)

validPosition

public boolean validPosition(double[] plane)

Description copied from class: Projecter

Is this a valid position in the projection plane for this image. This default is appropriate for all projections where the projection plane is infinite.

Overrides:

validPosition in class Projecter

straddleable

public boolean straddleable()

Description copied from class: Projecter

Is it possible for a pixel to straddle the valid region.

Overrides:

straddleable in class Projecter

straddle

public boolean straddle(double[][] pnts)

Does this figure straddle the boundary.

Overrides:

straddle in class Projecter

shadowPoint

public double[] shadowPoint(double x,
                            double y)

Find the shadow point for the given element.

Overrides:

shadowPoint in class Projecter

straddleComponents

public double[][][] straddleComponents(double[][] input)

Get the straddle regions from a given set. We don't truncate the at the boundaries of the ellipse. We can probably calulate this (i.e., by looking to see if each component crosses the ellipse boundary) but invalid pixels should be handled by the validPosition check. It seems unlikely that anyone is handling this boundary perfectly...

Overrides:

straddleComponents in class Projecter

main

public static void main(java.lang.String[] args)