jsky.image
Class EmptyRenderedImage

java.lang.Object
  jsky.image.SimpleRenderedImage
      jsky.image.EmptyRenderedImage

All Implemented Interfaces:

java.awt.image.RenderedImage

public class EmptyRenderedImage
extends SimpleRenderedImage

Implements a dummy RenderedImage, for use when there is no image to display.

Version:

$Revision: 1.1 $

Author:

Allan Brighton

Field Summary

Fields inherited from class jsky.image.SimpleRenderedImage

colorModel, height, minX, minY, properties, sampleModel, sources, tileGridXOffset, tileGridYOffset, tileHeight, tileWidth, width

Constructor Summary

EmptyRenderedImage()
Construct an "empty" image

EmptyRenderedImage(int w, int h)
Construct an "empty" image with the given width and height in pixels

Method Summary

protected javax.media.jai.PlanarImage	getPreviewImage(int size) Return a prescaled PlanarImage that fits entirely in a window of the given size, of null if there are any errors.
java.awt.image.Raster	getTile(int tileX, int tileY) Generate and return the given tile (required by the RenderedImage interface).
java.lang.Object	xxxgetProperty(java.lang.String name) Gets a property from the property set of this image.

Methods inherited from class jsky.image.SimpleRenderedImage

copyData, getBounds, getColorModel, getData, getData, getHeight, getMaxTileX, getMaxTileY, getMaxX, getMaxY, getMinTileX, getMinTileY, getMinX, getMinY, getNumXTiles, getNumYTiles, getProperty, getPropertyNames, getPropertyNames, getSampleModel, getSources, getTileGridXOffset, getTileGridYOffset, getTileHeight, getTileWidth, getWidth, tileXToX, tileXToX, tileYToY, tileYToY, XToTileX, XToTileX, YToTileY, YToTileY

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyRenderedImage

public EmptyRenderedImage(int w,
                          int h)

Construct an "empty" image with the given width and height in pixels

EmptyRenderedImage

public EmptyRenderedImage()

Construct an "empty" image

Method Detail

getTile

public java.awt.image.Raster getTile(int tileX,
                                     int tileY)

Generate and return the given tile (required by the RenderedImage interface).

Parameters:

tileX - the X index of the requested tile in the tile array.

tileY - the Y index of the requested tile in the tile array.

Returns:

the tile given by (tileX, tileY).

xxxgetProperty

public java.lang.Object xxxgetProperty(java.lang.String name)

Gets a property from the property set of this image. (redefined from parent class to support teh #preview_image property as for FITS files).

Parameters:

name - the name of the property to get, as a String.

Returns:

a reference to the property value or null if not found.

See Also:

FITSImage

getPreviewImage

protected javax.media.jai.PlanarImage getPreviewImage(int size)

Return a prescaled PlanarImage that fits entirely in a window of the given size, of null if there are any errors.