Field Detail

• GENERIC

  public static final SkyDataGeom GENERIC

  Instance which converts between unspecified, but identical, systems.

Constructor Detail

• SkyDataGeom

  protected SkyDataGeom(java.lang.String variantName)

  Constructor.

  Parameters:

  variantName - name for this data geom

Method Detail

• getDataDimCount

  public int getDataDimCount()

  Returns 3.

  Specified by:

  getDataDimCount in interface DataGeom

  Returns:

  number of elements in data space coordinate array

• hasPosition

  public boolean hasPosition()

  Description copied from interface: DataGeom
  Indicates whether the values read by the readDataPos method correspond to a point position in the data space. If true, a successful read will result in a position array with a definite value for each coordinate. If false, some of the coordinates may be NaN. A false return value would be appropriate for instance if each tuple row for the plot layer represented by this geom corresponds to a line rather than a point in the data space.

  Specified by:

  hasPosition in interface DataGeom

  Returns:

  true iff this geom represents point positions

• getVariantName

  public java.lang.String getVariantName()

  Description copied from interface: DataGeom
  Returns a label for this DataGeom. It may be used to distinguish from other geoms used in the same plot type, so for instance call it "Cartesian" or "Polar" rather than "Plane" if it's X,Y.

  Specified by:

  getVariantName in interface DataGeom

  Returns:

  user-directed input coordinate type name

• getPosCoords

  public Coord[] getPosCoords()

  Description copied from interface: DataGeom
  Returns the definitions for the user-supplied coordinates that indicate plot positions.

  Specified by:

  getPosCoords in interface DataGeom

  Returns:

  coordinate quantity array for this geometry

• readDataPos

  public boolean readDataPos(TupleSequence tseq,
                             int ic,
                             double[] dpos)

  Description copied from interface: DataGeom
  Determines the positional coordinates in data space for the current row of a supplied tuple sequence.

  A parameter supplies the index of the column in the tuple at which the positional coordinate(s) can be found. Each position is represented by DataGeom.getPosCoords() columns of the tuple. By convention positions are at the start of the tuple, so if there is one position in the tuple it will be at icol=0, and there are multiple positions the N'th one will be at icol=N*getPosCoords().

  An array of (at least) DataGeom.getDataDimCount() elements is supplied, and on success the data space coordinate values of the row of interest is written into it.

  Specified by:

  readDataPos in interface DataGeom

  Parameters:

  tseq - coordinate row sequence, positioned at the row of interest

  ic - column index in tseq at which the positional information starts

  dpos - array into which data space coordinates are written

  Returns:

  true iff conversion was successful

• hashCode

  public abstract int hashCode()

  Overrides:

  hashCode in class java.lang.Object

• equals

  public abstract boolean equals(java.lang.Object other)

  Overrides:

  equals in class java.lang.Object

• createGeom

  public static SkyDataGeom createGeom(SkySys userSys,
                                       SkySys viewSys)

  Creates a data geom with input user data in one sky system and output data coordinates in another sky system.

  Parameters:

  userSys - sky system in which user data is supplied

  viewSys - sky system in which the plot is viewed

  Returns:

  new data geom