org.geotools.renderer.shape
Class PolygonHandler

java.lang.Object
  org.geotools.renderer.shape.PolygonHandler

All Implemented Interfaces:

ShapeHandler

public class PolygonHandler

extends java.lang.Object

implements ShapeHandler

A ShapeHandler that reads PointHandler objects from a file. It returns a SimpleGeometry and decimates all points that map to the same screen location.

Since:

2.1.x

Author:

jeichar

Constructor Summary

PolygonHandler(ShapeType type, com.vividsolutions.jts.geom.Envelope env, org.opengis.referencing.operation.MathTransform mt, boolean hasOpacity)
Create new instance

Method Summary

int	getLength(java.lang.Object geometry) Get the length of the given geometry Object in bytes not 16-bit words.
ShapeType	getShapeType() Get the ShapeType of this handler.
java.lang.Object	read(java.nio.ByteBuffer buffer, ShapeType type) Read a geometry from the ByteBuffer.
void	write(java.nio.ByteBuffer buffer, java.lang.Object geometry) Write the geometry into the ByteBuffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

PolygonHandler

public PolygonHandler(ShapeType type,
                      com.vividsolutions.jts.geom.Envelope env,
                      org.opengis.referencing.operation.MathTransform mt,
                      boolean hasOpacity)
               throws org.opengis.referencing.operation.TransformException

Create new instance

Parameters:

type - the type of shape.

env - the area that is visible. If shape is not in area then skip.

mt - the transform to go from data to the envelope (and that should be used to transform the shape coords)

hasOpacity -

Method Detail

getShapeType

public ShapeType getShapeType()

Description copied from interface: ShapeHandler

Get the ShapeType of this handler.

Specified by:

getShapeType in interface ShapeHandler

Returns:

The ShapeType.

See Also:

ShapeHandler.getShapeType()

read

public java.lang.Object read(java.nio.ByteBuffer buffer,
                             ShapeType type)

Description copied from interface: ShapeHandler

Read a geometry from the ByteBuffer. The buffer's position, byteOrder, and limit are set to that which is needed. The record has been read as well as the shape type integer. The handler need not worry about reading unused information as the ShapefileReader will correctly adjust the buffer position after this call.

Specified by:

read in interface ShapeHandler

Parameters:

buffer - The ByteBuffer to read from.

Returns:

A geometry object.

write

public void write(java.nio.ByteBuffer buffer,
                  java.lang.Object geometry)

Description copied from interface: ShapeHandler

Write the geometry into the ByteBuffer. The position, byteOrder, and limit are all set. The handler is not responsible for writing the record or shape type integer.

Specified by:

write in interface ShapeHandler

Parameters:

buffer - The ByteBuffer to write to.

geometry - The geometry to write.

See Also:

ShapeHandler.write(java.nio.ByteBuffer, java.lang.Object)

getLength

public int getLength(java.lang.Object geometry)

Description copied from interface: ShapeHandler

Get the length of the given geometry Object in bytes not 16-bit words. This is easier to keep track of, since the ByteBuffer deals with bytes. Do not include the 8 bytes of record.

Specified by:

getLength in interface ShapeHandler

Parameters:

geometry - The geometry to analyze.

Returns:

The number of bytes the shape will take up.

See Also:

ShapeHandler.getLength(java.lang.Object)