com.sun.opengl.util.packrect
Class RectanglePacker

java.lang.Object
  com.sun.opengl.util.packrect.RectanglePacker

public class RectanglePacker
extends Object

Packs rectangles supplied by the user (typically representing image regions) into a larger backing store rectangle (typically representing a large texture). Supports automatic compaction of the space on the backing store, and automatic expansion of the backing store, when necessary.

Constructor Summary

RectanglePacker(BackingStoreManager manager, int initialWidth, int initialHeight)

Method Summary

void	add(Rect rect) Decides upon an (x, y) position for the given rectangle (leaving its width and height unchanged) and places it on the backing store.
void	clear() Clears all Rects contained in this RectanglePacker.
void	compact() Forces a compaction cycle, which typically results in allocating a new backing store and copying all entries to it.
void	dispose() Disposes the backing store allocated by the BackingStoreManager.
Object	getBackingStore()
void	remove(Rect rect) Removes the given rectangle from this RectanglePacker.
void	setMaxSize(int maxWidth, int maxHeight) Sets up a maximum width and height for the backing store.
float	verticalFragmentationRatio() Returns the vertical fragmentation ratio of this RectanglePacker.
void	visit(RectVisitor visitor) Visits all Rects contained in this RectanglePacker.

Methods inherited from class java.lang.Object

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

Constructor Detail

RectanglePacker

public RectanglePacker(BackingStoreManager manager,
                       int initialWidth,
                       int initialHeight)

Method Detail

getBackingStore

public Object getBackingStore()

setMaxSize

public void setMaxSize(int maxWidth,
                       int maxHeight)

Sets up a maximum width and height for the backing store. These are optional and if not specified the backing store will grow as necessary. Setting up a maximum width and height introduces the possibility that additions will fail; these are handled with the BackingStoreManager's allocationFailed notification.

add

public void add(Rect rect)
         throws RuntimeException

Decides upon an (x, y) position for the given rectangle (leaving its width and height unchanged) and places it on the backing store. May provoke re-layout of other Rects already added. If the BackingStoreManager does not support compaction, and BackingStoreManager.preExpand does not clear enough space for the incoming rectangle, then this method will throw a RuntimeException.

Throws:

RuntimeException

remove

public void remove(Rect rect)

Removes the given rectangle from this RectanglePacker.

visit

public void visit(RectVisitor visitor)

Visits all Rects contained in this RectanglePacker.

verticalFragmentationRatio

public float verticalFragmentationRatio()

Returns the vertical fragmentation ratio of this RectanglePacker. This is defined as the ratio of the sum of the heights of all completely empty Levels divided by the overall used height of the LevelSet. A high vertical fragmentation ratio indicates that it may be profitable to perform a compaction.

compact

public void compact()

Forces a compaction cycle, which typically results in allocating a new backing store and copying all entries to it.

clear

public void clear()

Clears all Rects contained in this RectanglePacker.

dispose

public void dispose()

Disposes the backing store allocated by the BackingStoreManager. This RectanglePacker may no longer be used after calling this method.