gov.nasa.worldwind.util
Class SectorVisibilityTree
java.lang.Object
 gov.nasa.worldwind.util.SectorVisibilityTree
public class SectorVisibilityTree - extends Object
Determines the visible sectors.
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
SectorVisibilityTree
public SectorVisibilityTree()
clearSectors
public void clearSectors()
getSectors
public ArrayList<Sector> getSectors()
getSectorSize
public double getSectorSize()
getTimeStamp
public long getTimeStamp()
refresh
public 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 contextsectorSize - 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:
IllegalArgumentException - if the draw context is null.
refresh
public List<Sector> refresh(DrawContext dc,
double sectorSize,
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 contextsectorSize - 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:
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 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 contextsectorSize - 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:
IllegalArgumentException - if the draw context is null, the sector size is less than or equal to zero, or
the search sector list is null.
setTimeStamp
public void setTimeStamp(long timeStamp)
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