Package gov.nasa.worldwind.util

Class SectorVisibilityTree

java.lang.Object

gov.nasa.worldwind.util.SectorVisibilityTree

public class SectorVisibilityTree
extends java.lang.Object

Determines the visible sectors at a specifed resolution within the draw context's current visible sector.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	SectorVisibilityTree.Context

Field Summary

Fields

Modifier and Type	Field	Description
protected java.lang.Object	globeStateKey
protected java.util.HashMap<Sector,Extent>	newExtents
protected java.util.HashMap<Sector,Extent>	prevExtents
protected java.util.ArrayList<Sector>	sectors
protected double	sectorSize
protected long	timeStamp
protected DecisionTree<Sector,SectorVisibilityTree.Context>	tree

Constructor Summary

Constructors

Constructor	Description
SectorVisibilityTree()

Method Summary

Modifier and Type	Method	Description
void	clearSectors()
java.util.List<Sector>	getSectors()
double	getSectorSize()
long	getTimeStamp()
java.util.List<Sector>	refresh(DrawContext dc, double sectorSize)	Determines the visible sectors at a specifed resolution within the draw context's current visible sector.
java.util.List<Sector>	refresh(DrawContext dc, double sectorSize, Sector searchSector)	Determines the visible sectors at a specified resolution within a specified sector.
java.util.List<Sector>	refresh(DrawContext dc, double sectorSize, java.util.List<Sector> searchSectors)	Determines the visible sectors at a specified resolution within a collection of sectors.
void	setTimeStamp(long timeStamp)
protected void	swapCylinderLists(DrawContext dc)

Methods inherited from class java.lang.Object

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

Field Detail

sectorSize

protected double sectorSize

globeStateKey

protected java.lang.Object globeStateKey

prevExtents

protected java.util.HashMap<Sector,Extent> prevExtents

newExtents

protected java.util.HashMap<Sector,Extent> newExtents

sectors

protected java.util.ArrayList<Sector> sectors

timeStamp

protected long timeStamp

tree

protected DecisionTree<Sector,SectorVisibilityTree.Context> tree

Constructor Detail

SectorVisibilityTree

public SectorVisibilityTree()

Method Detail

getSectorSize

public double getSectorSize()

getSectors

public java.util.List<Sector> getSectors()

getTimeStamp

public long getTimeStamp()

setTimeStamp

public void setTimeStamp(long timeStamp)

clearSectors

public void clearSectors()

refresh

public java.util.List<Sector> refresh(DrawContext dc,
                                      double sectorSize)

Determines the visible sectors at a specifed resolution within the draw context's current visible sector.

Parameters:

dc - the current draw context

sectorSize - the granularity of sector visibility, in degrees. All visible sectors of this size are found. The value must be in the range, 1 second <= sectorSize <= 180 degrees.

Returns:

the list of visible sectors. The list will be empty if no sectors are visible.

Throws:

java.lang.IllegalArgumentException - if the draw context is null.

refresh

public java.util.List<Sector> refresh(DrawContext dc,
                                      double sectorSize,
                                      Sector searchSector)

Determines the visible sectors at a specified resolution within a specified sector.

Parameters:

dc - the current draw context

sectorSize - the granularity of sector visibility, in degrees. All visible sectors of this size are found. The value must be in the range, 1 second <= sectorSize <= 180 degrees.

searchSector - the overall sector for which to determine visibility. May be null, in which case the current visible sector of the draw context is used.

Returns:

the list of visible sectors. The list will be empty if no sectors are visible.

Throws:

java.lang.IllegalArgumentException - if the draw context is null, the sector size is less than or equal to zero, or the search sector list is null.

refresh

public java.util.List<Sector> refresh(DrawContext dc,
                                      double sectorSize,
                                      java.util.List<Sector> searchSectors)

Determines the visible sectors at a specified resolution within a collection of sectors. This method can be used to recursively determine visible sectors: the output of one invocation can be passed as an argument to the next invocation.

Parameters:

dc - the current draw context

sectorSize - the granularity of sector visibility, in degrees. All visible sectors of this size are The value must be in the range, 1 second <= sectorSize <= 180 degrees. found.

searchSectors - the sectors for which to determine visibility.

Returns:

the list of visible sectors. The list will be empty if no sectors are visible.

Throws:

java.lang.IllegalArgumentException - if the draw context is null, the sector size is less than or equal to zero or the search sector list is null.

swapCylinderLists

protected void swapCylinderLists(DrawContext dc)