uk.ac.starlink.ttools.plot2.geom

Class SkyAspect

java.lang.Object

uk.ac.starlink.ttools.plot2.geom.SkyAspect

public class SkyAspect
extends Object

Defines the view of a SkySurface.

Since:

20 Feb 2013

Author:

Mark Taylor

Constructor Summary

Constructors

Constructor and Description
SkyAspect(double[] rotmat, double zoom, double xoff, double yoff) Constructor.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
double	getOffsetX() Returns the offset in the graphical X direction of the centre of the sky drawing from the centre of the available plotting region.
double	getOffsetY() Returns the offset in the graphical Y direction of the centre of the sky drawingn from the centre of the available plotting region.
double[]	getRotation() Returns rotation matrix.
double	getZoom() Returns zoom factor.
int	hashCode()
static double[]	unitMatrix(boolean reflect) Returns an optionally reflected unit matrix.

Methods inherited from class java.lang.Object

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

Constructor Detail

SkyAspect

public SkyAspect(double[] rotmat,
                 double zoom,
                 double xoff,
                 double yoff)

Constructor.

Parameters:

rotmat - 9-element rotation matrix

zoom - zoom factor; 1 means the sky is approximately the same size as plot bounds

xoff - x offset of plot centre from plot bounds centre in dimensionless units; 0 is centred

yoff - y offset of plot centre from plot bounds centre in dimensionless units; 0 is centred

Method Detail

getRotation

public double[] getRotation()

Returns rotation matrix.

Returns:

9-element coordinate rotation matrix

getZoom

public double getZoom()

Returns zoom factor. A value of 1 means the whole sky takes up approximately all the available plotting region.

Returns:

zoom factor

getOffsetX

public double getOffsetX()

Returns the offset in the graphical X direction of the centre of the sky drawing from the centre of the available plotting region. Units are dimensionless; 0 is centred.

Returns:

x offset

getOffsetY

public double getOffsetY()

Returns the offset in the graphical Y direction of the centre of the sky drawingn from the centre of the available plotting region. Units are dimensionless; 0 is centred.

Returns:

y offset

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

unitMatrix

public static double[] unitMatrix(boolean reflect)

Returns an optionally reflected unit matrix.

Parameters:

reflect - true for reflection

Returns:

unit matrix, possibly reflected