astro

Class GridShape

java.lang.Object

astro.GridShape

public class GridShape
extends Object

A class that comprises a grid-line. It uses a Morphing instance to convert a ra or de circle into a Shape object. Note that the Morphing instance should retrieve null if a ra/de point is not visible, i.e. on the wrong hemisphere.
The getRa(double, jview.CoordinateTransforming) or getDe(double, jview.CoordinateTransforming) methods return newly allocated shapes, thus this class can be re-used.

Field Summary

Fields

Modifier and Type	Field and Description
private static double	STEP The step-size in degrees.

Constructor Summary

Constructors

Constructor and Description
GridShape()

Method Summary

Modifier and Type	Method and Description
static Shape	getDe(double de0, CoordinateTransforming radec) Sets a constant dec.
static Shape	getRa(double ra0, CoordinateTransforming radec) Sets a constant ra.

Methods inherited from class java.lang.Object

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

Field Detail

STEP

private static final double STEP

The step-size in degrees.

See Also:

Constant Field Values

Constructor Detail

GridShape

public GridShape()

Method Detail

getRa

public static Shape getRa(double ra0,
                          CoordinateTransforming radec)

Sets a constant ra. Any shape set before is ereased. This path is constructed starting at de=-90 and going to de=90 in STEP degree steps. It is not closed.

Returns:

Null if never drawn

getDe

public static Shape getDe(double de0,
                          CoordinateTransforming radec)

Sets a constant dec. Any shape set before is ereased. This path is constructed starting at ra=0 and going to ra=360 in STEP/cos(de) degree steps. It is closed.

Returns:

Null if never drawn