Package org.geotools.geometry.jts

Class LiteShape

Object

LiteShape

All Implemented Interfaces:

Shape, Cloneable

public class LiteShape
extends Object
implements Shape, Cloneable

A thin wrapper that adapts a JTS geometry to the Shape interface so that the geometry can be used by java2d without coordinate cloning.

This implementation supports the use of addineTransform and has a hard coded decimation stratagy (so you can skip points within the same pixel producing a Shape that is "more simple" than the origional Geometry).

Author:

Andrea Aime

Constructor Summary

Constructors

Constructor	Description
LiteShape(Geometry geom, AffineTransform at, boolean generalize)	Creates a new LiteShape object.
LiteShape(Geometry geom, AffineTransform at, boolean generalize, double maxDistance)	Creates a new LiteShape object.

Method Summary

Modifier and Type	Method	Description
boolean	contains(double x, double y)	Tests if the specified coordinates are inside the boundary of the Shape.
boolean	contains(double x, double y, double w, double h)	Tests if the interior of the Shape entirely contains the specified rectangular area.
boolean	contains(Point2D p)	Tests if a specified Point2D is inside the boundary of the Shape.
boolean	contains(Rectangle2D r)	Tests if the interior of the Shape entirely contains the specified Rectangle2D.
AffineTransform	getAffineTransform()	Returns the affine transform for this lite shape
Rectangle	getBounds()	Returns an integer Rectangle that completely encloses the Shape.
Rectangle2D	getBounds2D()	Returns a high precision and more accurate bounding box of the Shape than the getBounds method.
Geometry	getGeometry()
PathIterator	getPathIterator(AffineTransform at)	Returns an iterator object that iterates along the Shape boundary and provides access to the geometry of the Shape outline.
PathIterator	getPathIterator(AffineTransform at, double flatness)	Returns an iterator object that iterates along the Shape boundary and provides access to a flattened view of the Shape outline geometry.
boolean	intersects(double x, double y, double w, double h)	Tests if the interior of the Shape intersects the interior of a specified rectangular area.
boolean	intersects(Rectangle2D r)	Tests if the interior of the Shape intersects the interior of a specified Rectangle2D.
void	setGeometry(Geometry g)	Sets the geometry contained in this lite shape.

Methods inherited from class Object

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

Constructor Detail

LiteShape

public LiteShape(Geometry geom,
                 AffineTransform at,
                 boolean generalize,
                 double maxDistance)

Creates a new LiteShape object.

Parameters:

geom - - the wrapped geometry

at - - the transformation applied to the geometry in order to get to the shape points

generalize - - set to true if the geometry need to be generalized during rendering

maxDistance - - distance used in the generalization process

LiteShape

public LiteShape(Geometry geom,
                 AffineTransform at,
                 boolean generalize)

Creates a new LiteShape object.

Parameters:

geom - - the wrapped geometry

at - - the transformation applied to the geometry in order to get to the shape points

generalize - - set to true if the geometry need to be generalized during rendering

Method Detail

setGeometry

public void setGeometry(Geometry g)

Sets the geometry contained in this lite shape. Convenient to reuse this object instead of creating it again and again during rendering

contains

public boolean contains(Rectangle2D r)

Tests if the interior of the Shape entirely contains the specified Rectangle2D. This method might conservatively return false when:

• the intersect method returns true and
• the calculations to determine whether or not the Shape entirely contains the Rectangle2D are prohibitively expensive.

This means that this method might return false even though the Shape contains the Rectangle2D. The Area class can be used to perform more accurate computations of geometric intersection for any Shape object if a more precise answer is required.

Specified by:

contains in interface Shape

Parameters:

r - The specified Rectangle2D

Returns:

true if the interior of the Shape entirely contains the Rectangle2D ; false otherwise or, if the Shape contains the Rectangle2D and the intersects method returns true and the containment calculations would be too expensive to perform.

See Also:

contains(double, double, double, double)

contains

public boolean contains(Point2D p)

Tests if a specified Point2D is inside the boundary of the Shape.

Specified by:

contains in interface Shape

Parameters:

p - a specified Point2D

Returns:

true if the specified Point2D is inside the boundary of the Shape; false otherwise.

contains

public boolean contains(double x,
                        double y)

Tests if the specified coordinates are inside the boundary of the Shape.

Specified by:

contains in interface Shape

Parameters:

x - the specified coordinates, x value

y - the specified coordinates, y value

Returns:

true if the specified coordinates are inside the Shape boundary; false otherwise.

contains

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

Tests if the interior of the Shape entirely contains the specified rectangular area. All coordinates that lie inside the rectangular area must lie within the Shape for the entire rectanglar area to be considered contained within the Shape .

This method might conservatively return false when:

• the intersect method returns true and
• the calculations to determine whether or not the Shape entirely contains the rectangular area are prohibitively expensive.

This means that this method might return false even though the Shape contains the rectangular area. The Area class can be used to perform more accurate computations of geometric intersection for any Shape object if a more precise answer is required.

Specified by:

contains in interface Shape

Parameters:

x - the coordinates of the specified rectangular area, x value

y - the coordinates of the specified rectangular area, y value

w - the width of the specified rectangular area

h - the height of the specified rectangular area

Returns:

true if the interior of the Shape entirely contains the specified rectangular area; false otherwise or, if the Shape contains the rectangular area and the intersects method returns true and the containment calculations would be too expensive to perform.

See Also:

Area, intersects(java.awt.geom.Rectangle2D)

getBounds

public Rectangle getBounds()

Returns an integer Rectangle that completely encloses the Shape. Note that there is no guarantee that the returned Rectangle is the smallest bounding box that encloses the Shape , only that the Shape lies entirely within the indicated Rectangle. The returned Rectangle might also fail to completely enclose the Shape if the Shape overflows the limited range of the integer data type. The getBounds2D method generally returns a tighter bounding box due to its greater flexibility in representation.

Specified by:

getBounds in interface Shape

Returns:

an integer Rectangle that completely encloses the Shape.

See Also:

getBounds2D()

getBounds2D

public Rectangle2D getBounds2D()

Returns a high precision and more accurate bounding box of the Shape than the getBounds method. Note that there is no guarantee that the returned Rectangle2D is the smallest bounding box that encloses the Shape, only that the Shape lies entirely within the indicated Rectangle2D. The bounding box returned by this method is usually tighter than that returned by the getBounds method and never fails due to overflow problems since the return value can be an instance of the Rectangle2D that uses double precision values to store the dimensions.

Specified by:

getBounds2D in interface Shape

Returns:

an instance of Rectangle2D that is a high-precision bounding box of the Shape.

See Also:

getBounds()

getPathIterator

public PathIterator getPathIterator(AffineTransform at)

Returns an iterator object that iterates along the Shape boundary and provides access to the geometry of the Shape outline. If an optional AffineTransform is specified, the coordinates returned in the iteration are transformed accordingly.

Each call to this method returns a fresh PathIterator object that traverses the geometry of the Shape object independently from any other PathIterator objects in use at the same time.

It is recommended, but not guaranteed, that objects implementing the Shape interface isolate iterations that are in process from any changes that might occur to the original object's geometry during such iterations.

Before using a particular implementation of the Shape interface in more than one thread simultaneously, refer to its documentation to verify that it guarantees that iterations are isolated from modifications.

Specified by:

getPathIterator in interface Shape

Parameters:

at - an optional AffineTransform to be applied to the coordinates as they are returned in the iteration, or null if untransformed coordinates are desired

Returns:

a new PathIterator object, which independently traverses the geometry of the Shape .

getPathIterator

public PathIterator getPathIterator(AffineTransform at,
                                    double flatness)

Returns an iterator object that iterates along the Shape boundary and provides access to a flattened view of the Shape outline geometry.

Only SEG_MOVETO, SEG_LINETO, and SEG_CLOSE point types are returned by the iterator.

If an optional AffineTransform is specified, the coordinates returned in the iteration are transformed accordingly.

The amount of subdivision of the curved segments is controlled by the flatness parameter, which specifies the maximum distance that any point on the unflattened transformed curve can deviate from the returned flattened path segments. Note that a limit on the accuracy of the flattened path might be silently imposed, causing very small flattening parameters to be treated as larger values. This limit, if there is one, is defined by the particular implementation that is used.

Each call to this method returns a fresh PathIterator object that traverses the Shape object geometry independently from any other PathIterator objects in use at the same time.

It is recommended, but not guaranteed, that objects implementing the Shape interface isolate iterations that are in process from any changes that might occur to the original object's geometry during such iterations.

Before using a particular implementation of this interface in more than one thread simultaneously, refer to its documentation to verify that it guarantees that iterations are isolated from modifications.

Specified by:

getPathIterator in interface Shape

Parameters:

at - an optional AffineTransform to be applied to the coordinates as they are returned in the iteration, or null if untransformed coordinates are desired

flatness - the maximum distance that the line segments used to approximate the curved segments are allowed to deviate from any point on the original curve

Returns:

a new PathIterator that independently traverses the Shape geometry.

intersects

public boolean intersects(Rectangle2D r)

Tests if the interior of the Shape intersects the interior of a specified Rectangle2D. This method might conservatively return true when:

• there is a high probability that the Rectangle2D and the Shape intersect, but
• the calculations to accurately determine this intersection are prohibitively expensive.

This means that this method might return true even though the Rectangle2D does not intersect the Shape.

Specified by:

intersects in interface Shape

Parameters:

r - the specified Rectangle2D

Returns:

true if the interior of the Shape and the interior of the specified Rectangle2D intersect, or are both highly likely to intersect and intersection calculations would be too expensive to perform; false otherwise.

See Also:

intersects(double, double, double, double)

intersects

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

Tests if the interior of the Shape intersects the interior of a specified rectangular area. The rectangular area is considered to intersect the Shape if any point is contained in both the interior of the Shape and the specified rectangular area.

This method might conservatively return true when:

• there is a high probability that the rectangular area and the Shape intersect, but
• the calculations to accurately determine this intersection are prohibitively expensive.

This means that this method might return true even though the rectangular area does not intersect the Shape. The Area class can be used to perform more accurate computations of geometric intersection for any Shape object if a more precise answer is required.

Specified by:

intersects in interface Shape

Parameters:

x - the coordinates of the specified rectangular area, x value

y - the coordinates of the specified rectangular area, y value

w - the width of the specified rectangular area

h - the height of the specified rectangular area

Returns:

true if the interior of the Shape and the interior of the rectangular area intersect, or are both highly likely to intersect and intersection calculations would be too expensive to perform; false otherwise.

See Also:

Area

getAffineTransform

public AffineTransform getAffineTransform()

Returns the affine transform for this lite shape

getGeometry

public Geometry getGeometry()