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java.lang.Object java.awt.geom.Area
public class Area
The Area
class is a deviceindependent specification of an
arbitrarilyshaped area. The Area
object is defined as an
object that performs certain binary CAG (Constructive Area Geometry)
operations on other areaenclosing geometries, such as rectangles,
ellipses, and polygons. The CAG operations are Add(union), Subtract,
Intersect, and ExclusiveOR. For example, an Area
can be
made up of the area of a rectangle minus the area of an ellipse.
Constructor Summary  

Area ()
Default constructor which creates an empty area. 

Area (Shape s)
The Area class creates an area geometry from the
specified Shape object. 
Method Summary  

void 
add (Area rhs)
Adds the shape of the specified Area to the
shape of this Area . 
Object 
clone ()
Returns an exact copy of this Area object. 
boolean 
contains (double x,
double y)
Tests if a specifed point lies inside the boundary of this Area object. 
boolean 
contains (double x,
double y,
double w,
double h)
Tests whether or not the interior of this Area object
completely contains the specified rectangular area. 
boolean 
contains (Point2D p)
Tests if a specified Point2D lies inside the boundary of the
this Area object. 
boolean 
contains (Rectangle2D p)
Tests whether or not the interior of this Area object
completely contains the specified Rectangle2D . 
Area 
createTransformedArea (AffineTransform t)
Creates a new Area object that contains the same
geometry as this Area transformed by the specified
AffineTransform . 
boolean 
equals (Area other)
Tests whether the geometries of the two Area objects
are equal. 
void 
exclusiveOr (Area rhs)
Sets the shape of this Area to be the combined area
of its current shape and the shape of the specified Area ,
minus their intersection. 
Rectangle 
getBounds ()
Returns a bounding Rectangle that completely encloses
this Area . 
Rectangle2D 
getBounds2D ()
Returns a high precision bounding Rectangle2D that
completely encloses this Area . 
PathIterator 
getPathIterator (AffineTransform at)
Creates a PathIterator for the outline of this
Area object. 
PathIterator 
getPathIterator (AffineTransform at,
double flatness)
Creates a PathIterator for the flattened outline of
this Area object. 
void 
intersect (Area rhs)
Sets the shape of this Area to the intersection of
its current shape and the shape of the specified Area . 
boolean 
intersects (double x,
double y,
double w,
double h)
Tests whether the interior of this Area object
intersects the interior of the specified rectangular area. 
boolean 
intersects (Rectangle2D p)
Tests whether the interior of this Area object
intersects the interior of the specified Rectangle2D . 
boolean 
isEmpty ()
Tests whether this Area object encloses any area. 
boolean 
isPolygonal ()
Tests whether this Area consists entirely of
straight edged polygonal geometry. 
boolean 
isRectangular ()
Tests whether this Area is rectangular in shape. 
boolean 
isSingular ()
Tests whether this Area is comprised of a single
closed subpath. 
void 
reset ()
Removes all of the geometry from this Area and
restores it to an empty area. 
void 
subtract (Area rhs)
Subtracts the shape of the specified Area from the
shape of this Area . 
void 
transform (AffineTransform t)
Transforms the geometry of this Area using the specified
AffineTransform . 
Methods inherited from class java.lang.Object 

equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait 
Constructor Detail 

public Area()
public Area(Shape s)
Area
class creates an area geometry from the
specified Shape
object. The geometry is explicitly
closed, if the Shape
is not already closed. The
fill rule (evenodd or winding) specified by the geometry of the
Shape
is used to determine the resulting enclosed area.
s
 the Shape
from which the area is constructedMethod Detail 

public void add(Area rhs)
Area
to the
shape of this Area
.
Addition is achieved through union.
rhs
 the Area
to be added to the
current shapepublic void subtract(Area rhs)
Area
from the
shape of this Area
.
rhs
 the Area
to be subtracted from the
current shapepublic void intersect(Area rhs)
Area
to the intersection of
its current shape and the shape of the specified Area
.
rhs
 the Area
to be intersected with this
Area
public void exclusiveOr(Area rhs)
Area
to be the combined area
of its current shape and the shape of the specified Area
,
minus their intersection.
rhs
 the Area
to be exclusive ORed with this
Area
.public void reset()
Area
and
restores it to an empty area.
public boolean isEmpty()
Area
object encloses any area.
true
if this Area
object
represents an empty area; false
otherwise.public boolean isPolygonal()
Area
consists entirely of
straight edged polygonal geometry.
true
if the geometry of this
Area
consists entirely of line segments;
false
otherwise.public boolean isRectangular()
Area
is rectangular in shape.
true
if the geometry of this
Area
is rectangular in shape; false
otherwise.public boolean isSingular()
Area
is comprised of a single
closed subpath. This method returns true
if the
path contains 0 or 1 subpaths, or false
if the path
contains more than 1 subpath. The subpaths are counted by the
number of SEG_MOVETO
segments
that appear in the path.
true
if the Area
is comprised
of a single basic geometry; false
otherwise.public Rectangle2D getBounds2D()
Rectangle2D
that
completely encloses this Area
.
The Area class will attempt to return the tightest bounding box possible for the Shape. The bounding box will not be padded to include the control points of curves in the outline of the Shape, but should tightly fit the actual geometry of the outline itself.
getBounds2D
in interface Shape
Rectangle2D
for the
Area
.Shape.getBounds()
public Rectangle getBounds()
Rectangle
that completely encloses
this Area
.
The Area class will attempt to return the tightest bounding box possible for the Shape. The bounding box will not be padded to include the control points of curves in the outline of the Shape, but should tightly fit the actual geometry of the outline itself. Since the returned object represents the bounding box with integers, the bounding box can only be as tight as the nearest integer coordinates that encompass the geometry of the Shape.
getBounds
in interface Shape
Rectangle
for the
Area
.Shape.getBounds2D()
public Object clone()
Area
object.
clone
in class Object
Cloneable
public boolean equals(Area other)
Area
objects
are equal.
other
 the Area
to be compared to this
Area
true
if the two geometries are equal;
false
otherwise.public void transform(AffineTransform t)
Area
using the specified
AffineTransform
. The geometry is transformed in place, which
permanently changes the enclosed area defined by this object.
t
 the transformation used to transform the areapublic Area createTransformedArea(AffineTransform t)
Area
object that contains the same
geometry as this Area
transformed by the specified
AffineTransform
. This Area
object
is unchanged.
t
 the specified AffineTransform
used to transform
the new Area
Area
object representing the transformed
geometry.public boolean contains(double x, double y)
Area
object.
contains
in interface Shape
x, y
 the specified point
true
if the point lies completely within the
interior of the Area
;
false
otherwise.public boolean contains(Point2D p)
Point2D
lies inside the boundary of the
this Area
object.
contains
in interface Shape
p
 the Point2D
to test
true
if the specified Point2D
lies completely within the interior of the Area
;
false
otherwise.public boolean contains(double x, double y, double w, double h)
Area
object
completely contains the specified rectangular area.
contains
in interface Shape
x, y
 the coordinates of the upper left corner of
the specified rectangular areaw
 the width of the specified rectangular areah
 the height of the specified rectangular area
true
if the specified rectangular area
lies completely within the interior of the Area
;
false
otherwise.Area
,
Shape.intersects(double, double, double, double)
public boolean contains(Rectangle2D p)
Area
object
completely contains the specified Rectangle2D
.
contains
in interface Shape
p
 the Rectangle2D
to test
true
if the Rectangle2D
lies
completely within the interior of the Area
;
false
otherwise.Shape.contains(double, double, double, double)
public boolean intersects(double x, double y, double w, double h)
Area
object
intersects the interior of the specified rectangular area.
intersects
in interface Shape
x, y
 the coordinates of the upper left corner of
the specified rectangular areaw
 the width of the specified rectangular areah
 the height of teh specified rectangular area
true
if the interior intersects the specified
rectangular area; false
otherwise;Area
public boolean intersects(Rectangle2D p)
Area
object
intersects the interior of the specified Rectangle2D
.
intersects
in interface Shape
p
 the Rectangle2D
to test for intersection
true
if the interior intersects the
specified Rectangle2D
;
false
otherwise.Shape.intersects(double, double, double, double)
public PathIterator getPathIterator(AffineTransform at)
PathIterator
for the outline of this
Area
object. This Area
object is unchanged.
getPathIterator
in interface Shape
at
 an optional AffineTransform
to be applied to
the coordinates as they are returned in the iteration, or
null
if untransformed coordinates are desired
PathIterator
object that returns the
geometry of the outline of this Area
, one
segment at a time.public PathIterator getPathIterator(AffineTransform at, double flatness)
PathIterator
for the flattened outline of
this Area
object. Only uncurved path segments
represented by the SEG_MOVETO, SEG_LINETO, and SEG_CLOSE point
types are returned by the iterator. This Area
object is unchanged.
getPathIterator
in interface Shape
at
 an optional AffineTransform
to be
applied to the coordinates as they are returned in the
iteration, or null
if untransformed coordinates
are desiredflatness
 the maximum amount that the control points
for a given curve can vary from colinear before a subdivided
curve is replaced by a straight line connecting the endpoints
PathIterator
object that returns the
geometry of the outline of this Area
, one segment
at a time.


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