org.postgis.java2d

Class PGShapeGeometry

java.lang.Object

org.postgresql.util.PGobject

org.postgis.java2d.PGShapeGeometry

All Implemented Interfaces:

Shape, Serializable, Cloneable

public class PGShapeGeometry
extends org.postgresql.util.PGobject
implements Shape

PostGIS Java2D geometry implementation (read-only). Supports PostGIS 1.x (lwgeom hexwkb). As the java.awt.Shape methods currently are implemented by using a java.awt.geom.GeneralPath object, they have the same semantics. BUG/TODO: MultiPoints or Points in a Geometry Collection currently don't work as expected, as some GeneralPath implementations throw away adjacent MoveTo commands as an optimization (e. G. sun 1.5 and ibm 1.5). Points thus are translated into MoveTo() followed by a closePath. This may change when we implement our own path logics. We have to evaluate whether Graphics2D renders a single MoveTo command as a single "brush tip", or we need the closePath() command nevertheless to get any drawing. Maybe we need a LineTo() to the same coordinages instead. (Multi)LineStrings are translated into a sequence of a single MoveTo and multiple LineTo vertices, and Polygon rings into a sequence of a single MoveTo, multiple LineTo and a closePath command. To allow correct Polygon filling, our PathIterators have GeneralPath.WIND_EVEN_ODD as winding rule.

Author:

Markus Schaber

See Also:

GeneralPath, Shape, PGobject, Serialized Form

Field Summary

Fields inherited from class org.postgresql.util.PGobject

type, value

Constructor Summary

Constructors

Constructor and Description
PGShapeGeometry() Constructor called by JDBC drivers.
PGShapeGeometry(GeneralPath path, int srid) Construct directly from a General Path and SRID value
PGShapeGeometry(String value) Construct with HexWKB representation

Method Summary

Modifier and Type	Method and Description
boolean	contains(double x, double y)
boolean	contains(double x, double y, double w, double h)
boolean	contains(Point2D p)
boolean	contains(Rectangle2D r)
boolean	equals(Object obj)
Rectangle	getBounds()
Rectangle2D	getBounds2D()
PathIterator	getPathIterator(AffineTransform at)
PathIterator	getPathIterator(AffineTransform at, double flatness)
int	getSRID() Return the SRID or Geometry.UNKNOWN_SRID if none was available
String	getValue() We currently have read-only support, so this method returns null
boolean	intersects(double x, double y, double w, double h)
boolean	intersects(Rectangle2D r)
void	setValue(String value) Reads the HexWKB representation - to be called by the jdbc drivers.
String	toString()

Methods inherited from class org.postgresql.util.PGobject

clone, getType, setType

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PGShapeGeometry

public PGShapeGeometry()

Constructor called by JDBC drivers. call setValue afterwards to fill with Geometry data.

PGShapeGeometry

public PGShapeGeometry(GeneralPath path,
                       int srid)

Construct directly from a General Path and SRID value

Parameters:

path - GeneralPath to be used

srid - SRID value to be used

PGShapeGeometry

public PGShapeGeometry(String value)
                throws SQLException

Construct with HexWKB representation

Parameters:

value - String representation of the HexWKB data

Throws:

SQLException - when a SQLException occurs

Method Detail

setValue

public void setValue(String value)
              throws SQLException

Reads the HexWKB representation - to be called by the jdbc drivers. Be shure to call this only once and if you used the PGShapeGeometry() constructor without parameters. In all other cases, behaviour is undefined.

Overrides:

setValue in class org.postgresql.util.PGobject

Throws:

SQLException

toString

public String toString()

Overrides:

toString in class org.postgresql.util.PGobject

getValue

public String getValue()

We currently have read-only support, so this method returns null

Overrides:

getValue in class org.postgresql.util.PGobject

equals

public boolean equals(Object obj)

Overrides:

equals in class org.postgresql.util.PGobject

getSRID

public int getSRID()

Return the SRID or Geometry.UNKNOWN_SRID if none was available

Returns:

the SRID value to be used

contains

public boolean contains(double x,
                        double y)

Specified by:

contains in interface Shape

contains

public boolean contains(double x,
                        double y,
                        double w,
                        double h)

Specified by:

contains in interface Shape

intersects

public boolean intersects(double x,
                          double y,
                          double w,
                          double h)

Specified by:

intersects in interface Shape

getBounds

public Rectangle getBounds()

Specified by:

getBounds in interface Shape

contains

public boolean contains(Point2D p)

Specified by:

contains in interface Shape

getBounds2D

public Rectangle2D getBounds2D()

Specified by:

getBounds2D in interface Shape

contains

public boolean contains(Rectangle2D r)

Specified by:

contains in interface Shape

intersects

public boolean intersects(Rectangle2D r)

Specified by:

intersects in interface Shape

getPathIterator

public PathIterator getPathIterator(AffineTransform at)

Specified by:

getPathIterator in interface Shape

getPathIterator

public PathIterator getPathIterator(AffineTransform at,
                                    double flatness)

Specified by:

getPathIterator in interface Shape