org.geotools.data

Class WorldFileReader

Object

WorldFileReader

public class WorldFileReader
extends Object

This class is responsible for parsing a world file in order to build an affine transform using the parameters provided in the file itself.

The parameters found in the file should be as follows:

1. size of pixel in x direction
2. rotation term for row
3. rotation term for column
4. size of pixel in y direction
5. x coordinate of centre of upper left pixel in map units
6. y coordinate of centre of upper left pixel in map units

Note that the last two coordinates refer to the centre of the pixel!

It is worth to point out that various data sources describe the parameters in the world file as the mapping from the pixel centres' to the associated world coords. Here we directly build the needed grid to world transform and we DO NOT add any half a pixel translation given that, as stated above, the values we receive should map to the centre of the pixel.

Since:

2.3

Author:

Simone Giannecchini, GeoSolutions

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_BUFFER_SIZE Default size for the underlying buffer,

Constructor Summary

Constructors

Constructor and Description
WorldFileReader(File inFile) Default constructor for a WorldFileReader.
WorldFileReader(File worldfile, int bufferSize) Constructor for a WorldFileReader.
WorldFileReader(URL worldfile) Constructor for a WorldFileReader.
WorldFileReader(URL worldfile, int bufferSize) Constructor for a WorldFileReader.

Method Summary

Modifier and Type	Method and Description
AffineTransform	getAffineTransform() Creates an AffineTransform for interoperability with Java2d.
double	getRotationX()
double	getRotationY()
MathTransform	getTransform()
double	getXPixelSize()
double	getXULC()
double	getYPixelSize()
double	getYULC()

Methods inherited from class Object

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

Field Detail

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

Default size for the underlying buffer,

See Also:

Constant Field Values

Constructor Detail

WorldFileReader

public WorldFileReader(File inFile)
                throws IOException

Default constructor for a WorldFileReader.

Parameters:

inFile - holds the location where to read from.

Throws:

IOException - in case something bad happens.

WorldFileReader

public WorldFileReader(File worldfile,
                       int bufferSize)
                throws IOException

Constructor for a WorldFileReader.

Parameters:

worldfile - holds the location where to read from.

bufferSize - to buffer when reading.

Throws:

IOException - in case something bad happens.

WorldFileReader

public WorldFileReader(URL worldfile,
                       int bufferSize)
                throws IOException

Constructor for a WorldFileReader.

Parameters:

worldfile - URL where to read from.

bufferSize - to buffer when reading.

Throws:

IOException - in case something bad happens.

WorldFileReader

public WorldFileReader(URL worldfile)
                throws IOException

Constructor for a WorldFileReader.

Parameters:

worldfile - URL where to read from.

bufferSize - to buffer when reading.

Throws:

IOException - in case something bad happens.

Method Detail

getRotationX

public double getRotationX()

getRotationY

public double getRotationY()

getXPixelSize

public double getXPixelSize()

getXULC

public double getXULC()

getYPixelSize

public double getYPixelSize()

getYULC

public double getYULC()

getTransform

public MathTransform getTransform()

getAffineTransform

public AffineTransform getAffineTransform()

Creates an AffineTransform for interoperability with Java2d.

Returns:

an AffineTransform representing the transformation represented by the underlying world file.