com.bc.ceres.glevel

Interface MultiLevelSource

All Known Implementing Classes:

AbstractMultiLevelSource, ColoredBandImageMultiLevelSource, ColoredMaskImageMultiLevelSource, DefaultMultiLevelImage, DefaultMultiLevelSource, FileMultiLevelSource, GenericMultiLevelSource, MultiLevelImage, TiledFileMultiLevelSource

public interface MultiLevelSource

A source for images at a given resolution level. The layout of the MultiLevelSource is given by a MultiLevelModel which also provides the number of available resolution levels.

Version:

$revision$ $date$

Field Summary

Fields

Modifier and Type	Field and Description
static MultiLevelSource	NULL

Method Summary

Modifier and Type	Method and Description
RenderedImage	getImage(int level) Gets the scaled image for the given resolution level.
Shape	getImageShape(int level) Gets the shape of the area where this image's raster data contains valid pixels at the given resolution level.
MultiLevelModel	getModel() Gets the layout model for the multi-resolution image supported by this LevelImageSource.
void	reset() Provides a hint that the level images provided so far will no longer be accessed from a reference in user space.

Field Detail

NULL

static final MultiLevelSource NULL

Method Detail

getModel

MultiLevelModel getModel()

Gets the layout model for the multi-resolution image supported by this LevelImageSource.

Returns:

the multi-resolution image model.

getImage

RenderedImage getImage(int level)

Gets the scaled image for the given resolution level. The width and height of an image returned for a given level is scale times smaller than the dimensions of the image at level=0.

Parameters:

level - The resolution level.

Returns:

The scaled image, must be in the range 0 to MultiLevelModel.getLevelCount()-1.

getImageShape

Shape getImageShape(int level)

Gets the shape of the area where this image's raster data contains valid pixels at the given resolution level. The method returns null, if the entire image raster contains valid pixels.

Parameters:

level - The resolution level.

Returns:

The shape of the area where the image has data, can be null.

reset

void reset()

Provides a hint that the level images provided so far will no longer be accessed from a reference in user space.

Therefore implementations of this method might also dispose any cached level images that have been provided so far.

After calling this method, a call to getImage(int)} for the same level may return a new level image instance.

This method is particularly useful if properties have changed that affect the appearance of the returned images at all levels, e.g. after a new color palette has been assigned or the contrast range has changed.