skyview.geometry.projecter

Class Tea

java.lang.Object

skyview.geometry.Transformer

skyview.geometry.Projecter

skyview.geometry.projecter.Tea

All Implemented Interfaces:

java.io.Serializable, Component

public class Tea
extends Projecter

This class provides for the translation between coordinates and the TEA Equal Area projection.

The projection is centered at the north pole. The south pole is projected to the four corners at (+/-1, +/-1). The equator projects to the diagonals running between the points (-1,0)->(0,1), (0,1)->(1,0), (1,0)->(0,-1), (-1,0)->(0,-1). These diagonals divide the four unit squares at the center of the coordinate grid into 8 right isoceles triangles.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	Tea.TeaDeproj Deproject from the plane back to the unit sphere

Constructor Summary

Constructors

Constructor and Description
Tea()

Method Summary

Modifier and Type	Method and Description
java.lang.String	getDescription() Get the description of this component.
java.lang.String	getName() Get the name of this component.
Deprojecter	inverse() Get the inverse
boolean	isInverse(Transformer obj) Are these two transformations, inverses of each other? This method is used to optimize a series of transformations where transformations.
static void	main(java.lang.String[] args)
boolean	straddle(double[][] vertices) Does this pixel go wrap around the standard region of the image? E.g., does it straddle the 180 deg in a Car or Ait projection?
boolean	straddleable() Is it possible for a pixel to straddle the valid region.
double[][][]	straddleComponents(double[][] vertices) If this is a straddling pixel, then return the straddle components
void	transform(double[] unit, double[] plane) Convert a single point where the output vector is supplied.

Methods inherited from class skyview.geometry.Projecter

allValid, getInputDimension, getOutputDimension, getXTiling, getYTiling, shadowPoint, tissot, validPosition

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

Tea

public Tea()

Method Detail

getName

public java.lang.String getName()

Description copied from interface: Component

Get the name of this component.

getDescription

public java.lang.String getDescription()

Description copied from interface: Component

Get the description of this component.

isInverse

public boolean isInverse(Transformer obj)

Description copied from class: Transformer

Are these two transformations, inverses of each other? This method is used to optimize a series of transformations where transformations.

Specified by:

isInverse in class Transformer

inverse

public Deprojecter inverse()

Description copied from class: Projecter

Get the inverse

Specified by:

inverse in class Projecter

transform

public void transform(double[] unit,
                      double[] plane)

Description copied from class: Transformer

Convert a single point where the output vector is supplied.

Specified by:

transform in class Transformer

Parameters:

unit - 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.

main

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

Throws:

java.lang.Exception

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[][] vertices)

Description copied from class: Projecter

Does this pixel go wrap around the standard region of the image? E.g., does it straddle the 180 deg in a Car or Ait projection?

Overrides:

straddle in class Projecter

straddleComponents

public double[][][] straddleComponents(double[][] vertices)

Description copied from class: Projecter

If this is a straddling pixel, then return the straddle components

Overrides:

straddleComponents in class Projecter