Package hec.map.tms.datasource

Class TmsLevel

java.lang.Object

hec.map.tms.datasource.TmsLevel

All Implemented Interfaces:

ImageObserver

public class TmsLevel
extends Object
implements ImageObserver

This is one level in a TMS file. Each level is a specified resolution. Level 0 is the most detailed resolution.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	TmsLevel.EmptyTile	Represents an area that is an empty tile.

Field Summary

Fields

Modifier and Type	Field	Description
static final float	NO_DATA_VALUE

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors

Constructor	Description
TmsLevel(TmsDataSource tmsDataSource, File f, String name)

Method Summary

Modifier and Type	Method	Description
void	clearImage()
void	close()
protected double	colToX(int col)	Returns the left hand X coordinate of this column
protected TmsImage	createImage(WorldRect visibleRect, TmsGlyphDataRecord gdr)	create the level image made up of the individual tile images that intersect the visible rectangle
WorldRect	getExtents()
TmsImage	getImage(WorldRect visibleRect, TmsGlyphDataRecord gdr)
double	getMaxX()
double	getMaxY()
double	getMinX()
double	getMinY()
float	getNoDataValue()
int	getNumberColumns()
int	getNumberRows()
Tile	getTile(int row, int column)	Returns the tile for a given row and column.
float[]	getValue(double[] easting, double[] northing)
boolean	imageUpdate(Image img, int infoflags, int x, int y, int width, int height)
protected double	rowToY(int row)	REtruns the top hand Y coordinate of this column
protected int	xToCol(double x)
protected int	yToRow(double y)

Methods inherited from class java.lang.Object

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

Field Details

NO_DATA_VALUE

public static final float NO_DATA_VALUE

See Also:

• Constant Field Values

Constructor Details

TmsLevel

public TmsLevel(TmsDataSource tmsDataSource,
 File f,
 String name)

Method Details

colToX

protected double colToX(int col)

Returns the left hand X coordinate of this column

Parameters:

col -

Returns:

rowToY

protected double rowToY(int row)

REtruns the top hand Y coordinate of this column

Parameters:

row -

Returns:

yToRow

protected int yToRow(double y)

xToCol

protected int xToCol(double x)

getImage

public TmsImage getImage(WorldRect visibleRect,
 TmsGlyphDataRecord gdr)

createImage

protected TmsImage createImage(WorldRect visibleRect,
 TmsGlyphDataRecord gdr)

create the level image made up of the individual tile images that intersect the visible rectangle

Parameters:

visibleRect -

gdr -

Returns:

Returns a TmsImage that contains the image and its bounding rectangle. Returns null if nothing can be drawn to that visible area.

getExtents

public WorldRect getExtents()

getNumberRows

public int getNumberRows()

getNumberColumns

public int getNumberColumns()

getMinX

public double getMinX()

getMaxX

public double getMaxX()

getMinY

public double getMinY()

getMaxY

public double getMaxY()

getNoDataValue

public float getNoDataValue()

getTile

public Tile getTile(int row,
 int column)

Returns the tile for a given row and column. There is no guarantee that a tile may exist at that row column. If no tile exists, then a null Tile is returned.

Parameters:

row -

column -

Returns:

getValue

public float[] getValue(double[] easting,
 double[] northing)

close

public void close()

imageUpdate

public boolean imageUpdate(Image img,
 int infoflags,
 int x,
 int y,
 int width,
 int height)

Specified by:

imageUpdate in interface ImageObserver

clearImage

public void clearImage()