gov.nasa.worldwind.util

Class Tile

java.lang.Object

gov.nasa.worldwind.util.Tile

All Implemented Interfaces:

Cacheable, Comparable<Tile>

Direct Known Subclasses:

BasicElevationModel.ElevationTile, TextureTile

public class Tile
extends Object
implements Comparable<Tile>, Cacheable

Large images and most imagery and elevation-data sets are subdivided in order to display visible portions quickly and without excessive memory usage. Each subdivision is called a tile, and a collections of adjacent tiles corresponding to a common spatial resolution is typically maintained in a Level. A collection of levels of progressive resolutions are maintained in a LevelSet. The Tile class represents a single tile of a subdivided image or elevation raster.

Individual tiles are identified by the level, row and column of the tile within its containing level set.

Constructor Summary

Constructors

Constructor and Description
Tile(Sector sector) Constructs a texture tile for a given sector with a default level, row and column.
Tile(Sector sector, Level level) Constructs a texture tile for a given sector and level, and with a default row and column.
Tile(Sector sector, Level level, int row, int column) Constructs a tile for a given sector, level, row and column of the tile's containing tile set.
Tile(Sector sector, Level level, int row, int column, String cacheName) Constructs a tile for a given sector, level, row and column of the tile's containing tile set.

Method Summary

Modifier and Type	Method and Description
int	compareTo(Tile tile)
static int	computeColumn(Angle delta, Angle longitude, Angle origin) Computes the column index of a longitude in the global tile grid corresponding to a specified grid interval.
static Angle	computeColumnLongitude(int column, Angle delta, Angle origin) Determines the minimum longitude of a column in the global tile grid corresponding to a specified grid interval.
static int	computeRow(Angle delta, Angle latitude, Angle origin) Computes the row index of a latitude in the global tile grid corresponding to a specified grid interval.
static Angle	computeRowLatitude(int row, Angle delta, Angle origin) Determines the minimum latitude of a row in the global tile grid corresponding to a specified grid interval.
boolean	equals(Object o)
String	getCacheName() Returns the tile's cache name.
int	getColumn()
String	getFormatSuffix()
int	getHeight()
String	getLabel()
Level	getLevel()
String	getLevelName()
int	getLevelNumber()
String	getPath()
String	getPathBase()
double	getPriority()
URL	getResourceURL()
URL	getResourceURL(String imageFormat)
int	getRow()
Sector	getSector()
long	getSizeInBytes() Retrieves the approximate size of this object in bytes.
TileKey	getTileKey()
int	getWidth()
int	hashCode()
void	setPriority(double priority)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Tile

public Tile(Sector sector)

Constructs a texture tile for a given sector with a default level, row and column.

Parameters:

sector - the sector to create the tile for.

Tile

public Tile(Sector sector,
            Level level)

Constructs a texture tile for a given sector and level, and with a default row and column.

Parameters:

sector - the sector to create the tile for.

level - the level to associate the tile with

Throws:

IllegalArgumentException - if sector or level are null.

Tile

public Tile(Sector sector,
            Level level,
            int row,
            int column)

Constructs a tile for a given sector, level, row and column of the tile's containing tile set.

Parameters:

sector - the sector corresponding with the tile.

level - the tile's level within a containing level set.

row - the row index (0 origin) of the tile within the indicated level.

column - the column index (0 origin) of the tile within the indicated level.

Throws:

IllegalArgumentException - if sector or level is null.

Tile

public Tile(Sector sector,
            Level level,
            int row,
            int column,
            String cacheName)

Constructs a tile for a given sector, level, row and column of the tile's containing tile set. If the cache name is non-null, it overrides the level's cache name and is returned by getCacheName(). Otherwise, the level's cache name is used.

Parameters:

sector - the sector corresponding with the tile.

level - the tile's level within a containing level set.

row - the row index (0 origin) of the tile within the indicated level.

column - the column index (0 origin) of the tile within the indicated level.

cacheName - optional cache name to override the Level's cache name. May be null.

Throws:

IllegalArgumentException - if sector or level is null.

Method Detail

compareTo

public int compareTo(Tile tile)

Specified by:

compareTo in interface Comparable<Tile>

computeColumn

public static int computeColumn(Angle delta,
                                Angle longitude,
                                Angle origin)

Computes the column index of a longitude in the global tile grid corresponding to a specified grid interval.

Parameters:

delta - the grid interval

longitude - the longitude for which to compute the column index

origin - the origin of the grid

Returns:

the column index of the column containing the specified latitude

Throws:

IllegalArgumentException - if delta is null or non-positive, or longitude is null, greater than positive 180 degrees, or less than negative 180 degrees

computeColumnLongitude

public static Angle computeColumnLongitude(int column,
                                           Angle delta,
                                           Angle origin)

Determines the minimum longitude of a column in the global tile grid corresponding to a specified grid interval.

Parameters:

column - the row index of the row in question

delta - the grid interval

origin - the origin of the grid

Returns:

the minimum longitude of the tile corresponding to the specified column

Throws:

IllegalArgumentException - if the grid interval (delta) is null or zero or the column index is negative.

computeRow

public static int computeRow(Angle delta,
                             Angle latitude,
                             Angle origin)

Computes the row index of a latitude in the global tile grid corresponding to a specified grid interval.

Parameters:

delta - the grid interval

latitude - the latitude for which to compute the row index

origin - the origin of the grid

Returns:

the row index of the row containing the specified latitude

Throws:

IllegalArgumentException - if delta is null or non-positive, or latitude is null, greater than positive 90 degrees, or less than negative 90 degrees

computeRowLatitude

public static Angle computeRowLatitude(int row,
                                       Angle delta,
                                       Angle origin)

Determines the minimum latitude of a row in the global tile grid corresponding to a specified grid interval.

Parameters:

row - the row index of the row in question

delta - the grid interval

origin - the origin of the grid

Returns:

the minimum latitude of the tile corresponding to the specified row

Throws:

IllegalArgumentException - if the grid interval (delta) is null or zero or the row index is negative.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

getCacheName

public final String getCacheName()

Returns the tile's cache name. If a non-null cache name was specified at construction, that name is returned. Otherwise this returns the level's cache name.

Returns:

the tile's cache name.

getColumn

public final int getColumn()

getFormatSuffix

public final String getFormatSuffix()

getHeight

public int getHeight()

getLabel

public String getLabel()

getLevel

public Level getLevel()

getLevelName

public final String getLevelName()

getLevelNumber

public final int getLevelNumber()

getPath

public String getPath()

getPathBase

public String getPathBase()

getPriority

public double getPriority()

getResourceURL

public URL getResourceURL()
                   throws MalformedURLException

Throws:

MalformedURLException

getResourceURL

public URL getResourceURL(String imageFormat)
                   throws MalformedURLException

Throws:

MalformedURLException

getRow

public final int getRow()

getSector

public final Sector getSector()

getSizeInBytes

public long getSizeInBytes()

Description copied from interface: Cacheable

Retrieves the approximate size of this object in bytes. Implementors are encouraged to calculate the exact size for smaller objects, but use approximate values for objects that include such large components that the approximation would produce an error so small that the extra computation would be wasteful.

Specified by:

getSizeInBytes in interface Cacheable

Returns:

this Cacheable object's size in bytes

getTileKey

public final TileKey getTileKey()

getWidth

public int getWidth()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

setPriority

public void setPriority(double priority)

toString

public String toString()

Overrides:

toString in class Object