jsky.image.fits.codec
Class FITSDataDouble

java.lang.Object
  jsky.image.fits.codec.FITSData
      jsky.image.fits.codec.FITSDataDouble

public class FITSDataDouble
extends FITSData

Used for double FITS image data (2D).

Version:

$Revision: 1.4 $

Author:

Allan Brighton

Field Summary

Fields inherited from class jsky.image.fits.codec.FITSData

_fitsImage, _height, _naxis, _width

Constructor Summary

FITSDataDouble(FITSImage fitsImage)
Constructor

Method Summary

Raster	getPreviewImage(Raster tile, int factor) Return a prescaled preview image at "1/factor" of the normal size in the given raster tile.
Raster	getTile(Raster tile, int subsample, int scaledWidth, int scaledHeight) Fill in the given tile with the appropriate image data.

Methods inherited from class jsky.image.fits.codec.FITSData

fillTile

Methods inherited from class java.lang.Object

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

Constructor Detail

FITSDataDouble

public FITSDataDouble(FITSImage fitsImage)

Constructor

Method Detail

getTile

public Raster getTile(Raster tile,
                      int subsample,
                      int scaledWidth,
                      int scaledHeight)
               throws IOException

Fill in the given tile with the appropriate image data.

If the memory mapped buffer is not null, the Y axis will be flipped to the normal orientation for display, otherwise this needs to be done later in the display widget.

Specified by:

getTile in class FITSData

Parameters:

tile - the tile to fill with data

subsample - the increment to use when zooming out using the mapped byte buffer

scaledWidth - the total image width in pixels (after prescaling, may be different than the "real" width)

scaledHeight - the total image height in pixels (after prescaling, may be different than the "real" height)

Returns:

the tile argument

Throws:

IOException

getPreviewImage

public Raster getPreviewImage(Raster tile,
                              int factor)
                       throws IOException

Return a prescaled preview image at "1/factor" of the normal size in the given raster tile.

Specified by:

getPreviewImage in class FITSData

Throws:

IOException