org.geotools.renderer.shape.shapehandler.simple
Class PointHandler

Object
  extended by PointHandler
All Implemented Interfaces:
ShapeHandler
Direct Known Subclasses:
PointHandler

public class PointHandler
extends 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
Module:

Constructor Summary
PointHandler(ShapeType type, Envelope env, Rectangle screenSize, MathTransform mt, boolean hasOpacity)
          Create new instance
 
Method Summary
protected  Object createGeometry(ShapeType type, Envelope geomBBox, double[][] transformed)
           
 int getLength(Object geometry)
          Get the length of the given geometry Object in bytes not 16-bit words.
 ShapeType getShapeType()
          Get the ShapeType of this handler.
 Object read(ByteBuffer buffer, ShapeType type)
          Read a geometry from the ByteBuffer.
 void write(ByteBuffer buffer, Object geometry)
          Write the geometry into the ByteBuffer.
 
Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PointHandler

public PointHandler(ShapeType type,
                    Envelope env,
                    Rectangle screenSize,
                    MathTransform mt,
                    boolean hasOpacity)
             throws 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 -
Throws:
TransformException
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 Object read(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.

createGeometry

protected Object createGeometry(ShapeType type,
                                Envelope geomBBox,
                                double[][] transformed)

write

public void write(ByteBuffer buffer,
                  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(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)


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