uk.ac.starlink.ttools.plot2.layer
Class SkyVectorCoordSet

java.lang.Object
  uk.ac.starlink.ttools.plot2.layer.SkyVectorCoordSet

All Implemented Interfaces:

MultiPointCoordSet

public class SkyVectorCoordSet
extends Object
implements MultiPointCoordSet

MultiPointCoordSet for vectors on the sky.

Since:

18 Feb 2013

Author:

Mark Taylor

Constructor Summary

SkyVectorCoordSet(boolean preMultCosLat)
Constructor.

Method Summary

Coord[]	getCoords() Returns the coordinate definitions.
int	getPointCount() Returns the number of (non-central) data positions defined by this coord set.
boolean	readPoints(TupleSequence tseq, int icol, double[] xyz0, double[][] xyzExtras) Reads the non-central points from a appropriate span of columns in the current row of a supplied TupleSequence.

Methods inherited from class java.lang.Object

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

Constructor Detail

SkyVectorCoordSet

public SkyVectorCoordSet(boolean preMultCosLat)

Constructor.

Parameters:

preMultCosLat - true iff the user-supplied longitude values have been premultiplied by cos(latitude)

Method Detail

getCoords

public Coord[] getCoords()

Description copied from interface: MultiPointCoordSet

Returns the coordinate definitions.

Specified by:

getCoords in interface MultiPointCoordSet

Returns:

coords

getPointCount

public int getPointCount()

Description copied from interface: MultiPointCoordSet

Returns the number of (non-central) data positions defined by this coord set.

Specified by:

getPointCount in interface MultiPointCoordSet

Returns:

data position count

readPoints

public boolean readPoints(TupleSequence tseq,
                          int icol,
                          double[] xyz0,
                          double[][] xyzExtras)

Description copied from interface: MultiPointCoordSet

Reads the non-central points from a appropriate span of columns in the current row of a supplied TupleSequence. The central data position must be supplied as input. The icol value gives the column corresponding to the first coord of this coordinate set in the sequence; the following few columns are assumed to correspod 1:1 to the coords in this coord set.

Specified by:

readPoints in interface MultiPointCoordSet

Parameters:

tseq - tuple sequence, positioned at the row of interest

icol - index of column in the sequence corresponding to the first of the coordinates in this set

xyz0 - nDataDim-element array giving central data position

xyzExtras - [nPointCount][nDataDim]-shaped array into which the non-central data positions will be written

Returns:

true iff the conversion was successful