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java.lang.Object java.awt.geom.RectangularShape java.awt.geom.Rectangle2D java.awt.Rectangle
public class Rectangle
A Rectangle
specifies an area in a coordinate space that is
enclosed by the Rectangle
object's upperleft point
(x,y)
in the coordinate space, its width, and its height.
A Rectangle
object's width
and
height
are public
fields. The constructors
that create a Rectangle
, and the methods that can modify
one, do not prevent setting a negative value for width or height.
A Rectangle
whose width or height is exactly zero has location
along those axes with zero dimension, but is otherwise considered empty.
The isEmpty()
method will return true for such a Rectangle
.
Methods which test if an empty Rectangle
contains or intersects
a point or rectangle will always return false if either dimension is zero.
Methods which combine such a Rectangle
with a point or rectangle
will include the location of the Rectangle
on that axis in the
result as if the add(Point)
method were being called.
Methods which affect only the location of a Rectangle
will
operate on its location regardless of whether or not it has a negative
or zero dimension along either axis.
Note that a Rectangle
constructed with the default noargument
constructor will have dimensions of 0x0
and therefore be empty.
That Rectangle
will still have a location of (0,0)
and
will contribute that location to the union and add operations.
Code attempting to accumulate the bounds of a set of points should
therefore initially construct the Rectangle
with a specifically
negative width and height or it should use the first point in the set
to construct the Rectangle
.
For example:
Rectangle bounds = new Rectangle(0, 0, 1, 1); for (int i = 0; i < points.length; i++) { bounds.add(points[i]); }or if we know that the points array contains at least one point:
Rectangle bounds = new Rectangle(points[0]); for (int i = 1; i < points.length; i++) { bounds.add(points[i]); }
This class uses 32bit integers to store its location and dimensions.
Frequently operations may produce a result that exceeds the range of
a 32bit integer.
The methods will calculate their results in a way that avoids any
32bit overflow for intermediate results and then choose the best
representation to store the final results back into the 32bit fields
which hold the location and dimensions.
The location of the result will be stored into the x
and
y
fields by clipping the true result to the nearest 32bit value.
The values stored into the width
and height
dimension
fields will be chosen as the 32bit values that encompass the largest
part of the true result as possible.
Generally this means that the dimension will be clipped independently
to the range of 32bit integers except that if the location had to be
moved to store it into its pair of 32bit fields then the dimensions
will be adjusted relative to the "best representation" of the location.
If the true result had a negative dimension and was therefore
nonexistant along one or both axes, the stored dimensions will be
negative numbers in those axes.
If the true result had a location that could be represented within
the range of 32bit integers, but zero dimension along one or both
axes, then the stored dimensions will be zero in those axes.
Nested Class Summary 

Nested classes/interfaces inherited from class java.awt.geom.Rectangle2D 

Rectangle2D.Double, Rectangle2D.Float 
Field Summary  

int 
height
The height of the Rectangle . 
int 
width
The width of the Rectangle . 
int 
x
The X coordinate of the upperleft corner of the Rectangle . 
int 
y
The Y coordinate of the upperleft corner of the Rectangle . 
Fields inherited from class java.awt.geom.Rectangle2D 

OUT_BOTTOM, OUT_LEFT, OUT_RIGHT, OUT_TOP 
Constructor Summary  

Rectangle()
Constructs a new Rectangle whose upperleft corner
is at (0, 0) in the coordinate space, and whose width and
height are both zero. 

Rectangle(Dimension d)
Constructs a new Rectangle whose top left corner is
(0, 0) and whose width and height are specified
by the Dimension argument. 

Rectangle(int width,
int height)
Constructs a new Rectangle whose upperleft corner
is at (0, 0) in the coordinate space, and whose width and
height are specified by the arguments of the same name. 

Rectangle(int x,
int y,
int width,
int height)
Constructs a new Rectangle whose upperleft corner is
specified as
(x,y) and whose width and height
are specified by the arguments of the same name. 

Rectangle(Point p)
Constructs a new Rectangle whose upperleft corner is the
specified Point , and whose width and height are both zero. 

Rectangle(Point p,
Dimension d)
Constructs a new Rectangle whose upperleft corner is
specified by the Point argument, and
whose width and height are specified by the
Dimension argument. 

Rectangle(Rectangle r)
Constructs a new Rectangle , initialized to match
the values of the specified Rectangle . 
Method Summary  

void 
add(int newx,
int newy)
Adds a point, specified by the integer arguments newx,newy
to the bounds of this Rectangle . 
void 
add(Point pt)
Adds the specified Point to the bounds of this
Rectangle . 
void 
add(Rectangle r)
Adds a Rectangle to this Rectangle . 
boolean 
contains(int x,
int y)
Checks whether or not this Rectangle contains the
point at the specified location (x,y) . 
boolean 
contains(int X,
int Y,
int W,
int H)
Checks whether this Rectangle entirely contains
the Rectangle
at the specified location (X,Y) with the
specified dimensions (W,H) . 
boolean 
contains(Point p)
Checks whether or not this Rectangle contains the
specified Point . 
boolean 
contains(Rectangle r)
Checks whether or not this Rectangle entirely contains
the specified Rectangle . 
Rectangle2D 
createIntersection(Rectangle2D r)
Returns a new Rectangle2D object representing the
intersection of this Rectangle2D with the specified
Rectangle2D . 
Rectangle2D 
createUnion(Rectangle2D r)
Returns a new Rectangle2D object representing the
union of this Rectangle2D with the specified
Rectangle2D . 
boolean 
equals(Object obj)
Checks whether two rectangles are equal. 
Rectangle 
getBounds()
Gets the bounding Rectangle of this Rectangle . 
Rectangle2D 
getBounds2D()
Returns a high precision and more accurate bounding box of the Shape than the getBounds method. 
double 
getHeight()
Returns the height of the bounding Rectangle in
double precision. 
Point 
getLocation()
Returns the location of this Rectangle . 
Dimension 
getSize()
Gets the size of this Rectangle , represented by
the returned Dimension . 
double 
getWidth()
Returns the width of the bounding Rectangle in
double precision. 
double 
getX()
Returns the X coordinate of the bounding Rectangle in
double precision. 
double 
getY()
Returns the Y coordinate of the bounding Rectangle in
double precision. 
void 
grow(int h,
int v)
Resizes the Rectangle both horizontally and vertically. 
boolean 
inside(int X,
int Y)
Deprecated. As of JDK version 1.1, replaced by contains(int, int) . 
Rectangle 
intersection(Rectangle r)
Computes the intersection of this Rectangle with the
specified Rectangle . 
boolean 
intersects(Rectangle r)
Determines whether or not this Rectangle and the specified
Rectangle intersect. 
boolean 
isEmpty()
Determines whether the RectangularShape is empty. 
void 
move(int x,
int y)
Deprecated. As of JDK version 1.1, replaced by setLocation(int, int) . 
int 
outcode(double x,
double y)
Determines where the specified coordinates lie with respect to this Rectangle2D . 
void 
reshape(int x,
int y,
int width,
int height)
Deprecated. As of JDK version 1.1, replaced by setBounds(int, int, int, int) . 
void 
resize(int width,
int height)
Deprecated. As of JDK version 1.1, replaced by setSize(int, int) . 
void 
setBounds(int x,
int y,
int width,
int height)
Sets the bounding Rectangle of this
Rectangle to the specified
x , y , width ,
and height . 
void 
setBounds(Rectangle r)
Sets the bounding Rectangle of this Rectangle
to match the specified Rectangle . 
void 
setLocation(int x,
int y)
Moves this Rectangle to the specified location. 
void 
setLocation(Point p)
Moves this Rectangle to the specified location. 
void 
setRect(double x,
double y,
double width,
double height)
Sets the bounds of this Rectangle to the integer bounds
which encompass the specified x , y , width ,
and height . 
void 
setSize(Dimension d)
Sets the size of this Rectangle to match the
specified Dimension . 
void 
setSize(int width,
int height)
Sets the size of this Rectangle to the specified
width and height. 
String 
toString()
Returns a String representing this
Rectangle and its values. 
void 
translate(int dx,
int dy)
Translates this Rectangle the indicated distance,
to the right along the X coordinate axis, and
downward along the Y coordinate axis. 
Rectangle 
union(Rectangle r)
Computes the union of this Rectangle with the
specified Rectangle . 
Methods inherited from class java.awt.geom.Rectangle2D 

add, add, add, contains, contains, getPathIterator, getPathIterator, hashCode, intersect, intersects, intersectsLine, intersectsLine, outcode, setFrame, setRect, union 
Methods inherited from class java.awt.geom.RectangularShape 

clone, contains, contains, getCenterX, getCenterY, getFrame, getMaxX, getMaxY, getMinX, getMinY, intersects, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal 
Methods inherited from class java.lang.Object 

finalize, getClass, notify, notifyAll, wait, wait, wait 
Methods inherited from interface java.awt.Shape 

contains, contains, contains, contains, getPathIterator, getPathIterator, intersects, intersects 
Field Detail 

public int x
Rectangle
.
setLocation(int, int)
,
getLocation()
public int y
Rectangle
.
setLocation(int, int)
,
getLocation()
public int width
Rectangle
.
setSize(int, int)
,
getSize()
public int height
Rectangle
.
setSize(int, int)
,
getSize()
Constructor Detail 

public Rectangle()
Rectangle
whose upperleft corner
is at (0, 0) in the coordinate space, and whose width and
height are both zero.
public Rectangle(Rectangle r)
Rectangle
, initialized to match
the values of the specified Rectangle
.
r
 the Rectangle
from which to copy initial values
to a newly constructed Rectangle
public Rectangle(int x, int y, int width, int height)
Rectangle
whose upperleft corner is
specified as
(x,y)
and whose width and height
are specified by the arguments of the same name.
x
 the specified X coordinatey
 the specified Y coordinatewidth
 the width of the Rectangle
height
 the height of the Rectangle
public Rectangle(int width, int height)
Rectangle
whose upperleft corner
is at (0, 0) in the coordinate space, and whose width and
height are specified by the arguments of the same name.
width
 the width of the Rectangle
height
 the height of the Rectangle
public Rectangle(Point p, Dimension d)
Rectangle
whose upperleft corner is
specified by the Point
argument, and
whose width and height are specified by the
Dimension
argument.
p
 a Point
that is the upperleft corner of
the Rectangle
d
 a Dimension
, representing the
width and height of the Rectangle
public Rectangle(Point p)
Rectangle
whose upperleft corner is the
specified Point
, and whose width and height are both zero.
p
 a Point
that is the top left corner
of the Rectangle
public Rectangle(Dimension d)
Rectangle
whose top left corner is
(0, 0) and whose width and height are specified
by the Dimension
argument.
d
 a Dimension
, specifying width and heightMethod Detail 

public double getX()
Rectangle
in
double
precision.
getX
in class RectangularShape
Rectangle
.public double getY()
Rectangle
in
double
precision.
getY
in class RectangularShape
Rectangle
.public double getWidth()
Rectangle
in
double
precision.
getWidth
in class RectangularShape
Rectangle
.public double getHeight()
Rectangle
in
double
precision.
getHeight
in class RectangularShape
Rectangle
.public Rectangle getBounds()
Rectangle
of this Rectangle
.
This method is included for completeness, to parallel the
getBounds
method of
Component
.
getBounds
in interface Shape
getBounds
in class RectangularShape
Rectangle
, equal to the
bounding Rectangle
for this Rectangle
.Component.getBounds()
,
setBounds(Rectangle)
,
setBounds(int, int, int, int)
public Rectangle2D getBounds2D()
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.
getBounds2D
in interface Shape
getBounds2D
in class Rectangle2D
Rectangle2D
that is a
highprecision bounding box of the Shape
.Shape.getBounds()
public void setBounds(Rectangle r)
Rectangle
of this Rectangle
to match the specified Rectangle
.
This method is included for completeness, to parallel the
setBounds
method of Component
.
r
 the specified Rectangle
getBounds()
,
Component.setBounds(java.awt.Rectangle)
public void setBounds(int x, int y, int width, int height)
Rectangle
of this
Rectangle
to the specified
x
, y
, width
,
and height
.
This method is included for completeness, to parallel the
setBounds
method of Component
.
x
 the new X coordinate for the upperleft
corner of this Rectangle
y
 the new Y coordinate for the upperleft
corner of this Rectangle
width
 the new width for this Rectangle
height
 the new height for this Rectangle
getBounds()
,
Component.setBounds(int, int, int, int)
public void setRect(double x, double y, double width, double height)
Rectangle
to the integer bounds
which encompass the specified x
, y
, width
,
and height
.
If the parameters specify a Rectangle
that exceeds the
maximum range of integers, the result will be the best
representation of the specified Rectangle
intersected
with the maximum integer bounds.
setRect
in class Rectangle2D
x
 the X coordinate of the upperleft corner of
the specified rectangley
 the Y coordinate of the upperleft corner of
the specified rectanglewidth
 the width of the specified rectangleheight
 the new height of the specified rectangle@Deprecated public void reshape(int x, int y, int width, int height)
setBounds(int, int, int, int)
.
Rectangle
of this
Rectangle
to the specified
x
, y
, width
,
and height
.
x
 the new X coordinate for the upperleft
corner of this Rectangle
y
 the new Y coordinate for the upperleft
corner of this Rectangle
width
 the new width for this Rectangle
height
 the new height for this Rectangle
public Point getLocation()
Rectangle
.
This method is included for completeness, to parallel the
getLocation
method of Component
.
Point
that is the upperleft corner of
this Rectangle
.Component.getLocation()
,
setLocation(Point)
,
setLocation(int, int)
public void setLocation(Point p)
Rectangle
to the specified location.
This method is included for completeness, to parallel the
setLocation
method of Component
.
p
 the Point
specifying the new location
for this Rectangle
Component.setLocation(java.awt.Point)
,
getLocation()
public void setLocation(int x, int y)
Rectangle
to the specified location.
This method is included for completeness, to parallel the
setLocation
method of Component
.
x
 the X coordinate of the new locationy
 the Y coordinate of the new locationgetLocation()
,
Component.setLocation(int, int)
@Deprecated public void move(int x, int y)
setLocation(int, int)
.
Rectangle
to the specified location.
x
 the X coordinate of the new locationy
 the Y coordinate of the new locationpublic void translate(int dx, int dy)
Rectangle
the indicated distance,
to the right along the X coordinate axis, and
downward along the Y coordinate axis.
dx
 the distance to move this Rectangle
along the X axisdy
 the distance to move this Rectangle
along the Y axissetLocation(int, int)
,
setLocation(java.awt.Point)
public Dimension getSize()
Rectangle
, represented by
the returned Dimension
.
This method is included for completeness, to parallel the
getSize
method of Component
.
Dimension
, representing the size of
this Rectangle
.Component.getSize()
,
setSize(Dimension)
,
setSize(int, int)
public void setSize(Dimension d)
Rectangle
to match the
specified Dimension
.
This method is included for completeness, to parallel the
setSize
method of Component
.
d
 the new size for the Dimension
objectComponent.setSize(java.awt.Dimension)
,
getSize()
public void setSize(int width, int height)
Rectangle
to the specified
width and height.
This method is included for completeness, to parallel the
setSize
method of Component
.
width
 the new width for this Rectangle
height
 the new height for this Rectangle
Component.setSize(int, int)
,
getSize()
@Deprecated public void resize(int width, int height)
setSize(int, int)
.
Rectangle
to the specified
width and height.
width
 the new width for this Rectangle
height
 the new height for this Rectangle
public boolean contains(Point p)
Rectangle
contains the
specified Point
.
p
 the Point
to test
true
if the specified Point
is inside this Rectangle
;
false
otherwise.public boolean contains(int x, int y)
Rectangle
contains the
point at the specified location (x,y)
.
x
 the specified X coordinatey
 the specified Y coordinate
true
if the point
(x,y)
is inside this
Rectangle
;
false
otherwise.public boolean contains(Rectangle r)
Rectangle
entirely contains
the specified Rectangle
.
r
 the specified Rectangle
true
if the Rectangle
is contained entirely inside this Rectangle
;
false
otherwisepublic boolean contains(int X, int Y, int W, int H)
Rectangle
entirely contains
the Rectangle
at the specified location (X,Y)
with the
specified dimensions (W,H)
.
X
 the specified X coordinateY
 the specified Y coordinateW
 the width of the Rectangle
H
 the height of the Rectangle
true
if the Rectangle
specified by
(X, Y, W, H)
is entirely enclosed inside this Rectangle
;
false
otherwise.@Deprecated public boolean inside(int X, int Y)
contains(int, int)
.
Rectangle
contains the
point at the specified location (X,Y)
.
X
 the specified X coordinateY
 the specified Y coordinate
true
if the point
(X,Y)
is inside this
Rectangle
;
false
otherwise.public boolean intersects(Rectangle r)
Rectangle
and the specified
Rectangle
intersect. Two rectangles intersect if
their intersection is nonempty.
r
 the specified Rectangle
true
if the specified Rectangle
and this Rectangle
intersect;
false
otherwise.public Rectangle intersection(Rectangle r)
Rectangle
with the
specified Rectangle
. Returns a new Rectangle
that represents the intersection of the two rectangles.
If the two rectangles do not intersect, the result will be
an empty rectangle.
r
 the specified Rectangle
Rectangle
contained in both the
specified Rectangle
and in
this Rectangle
; or if the rectangles
do not intersect, an empty rectangle.public Rectangle union(Rectangle r)
Rectangle
with the
specified Rectangle
. Returns a new
Rectangle
that
represents the union of the two rectangles.
If either Rectangle
has any dimension less than zero
the rules for nonexistant rectangles
apply.
If only one has a dimension less than zero, then the result
will be a copy of the other Rectangle
.
If both have dimension less than zero, then the result will
have at least one dimension less than zero.
If the resulting Rectangle
would have a dimension
too large to be expressed as an int
, the result
will have a dimension of Integer.MAX_VALUE
along
that dimension.
r
 the specified Rectangle
Rectangle
containing both
the specified Rectangle
and this
Rectangle
.public void add(int newx, int newy)
newx,newy
to the bounds of this Rectangle
.
If this Rectangle
has any dimension less than zero,
the rules for nonexistant
rectangles apply.
In that case, the new bounds of this Rectangle
will
have a location equal to the specified coordinates and
width and height equal to zero.
After adding a point, a call to contains
with the
added point as an argument does not necessarily return
true
. The contains
method does not
return true
for points on the right or bottom
edges of a Rectangle
. Therefore, if the added point
falls on the right or bottom edge of the enlarged
Rectangle
, contains
returns
false
for that point.
If the specified point must be contained within the new
Rectangle
, a 1x1 rectangle should be added instead:
r.add(newx, newy, 1, 1);
newx
 the X coordinate of the new pointnewy
 the Y coordinate of the new pointpublic void add(Point pt)
Point
to the bounds of this
Rectangle
.
If this Rectangle
has any dimension less than zero,
the rules for nonexistant
rectangles apply.
In that case, the new bounds of this Rectangle
will
have a location equal to the coordinates of the specified
Point
and width and height equal to zero.
After adding a Point
, a call to contains
with the added Point
as an argument does not
necessarily return true
. The contains
method does not return true
for points on the right
or bottom edges of a Rectangle
. Therefore if the added
Point
falls on the right or bottom edge of the
enlarged Rectangle
, contains
returns
false
for that Point
.
If the specified point must be contained within the new
Rectangle
, a 1x1 rectangle should be added instead:
r.add(pt.x, pt.y, 1, 1);
pt
 the new Point
to add to this
Rectangle
public void add(Rectangle r)
Rectangle
to this Rectangle
.
The resulting Rectangle
is the union of the two
rectangles.
If either Rectangle
has any dimension less than 0, the
result will have the dimensions of the other Rectangle
.
If both Rectangle
s have at least one dimension less
than 0, the result will have at least one dimension less than 0.
If either Rectangle
has one or both dimensions equal
to 0, the result along those axes with 0 dimensions will be
equivalent to the results obtained by adding the corresponding
origin coordinate to the result rectangle along that axis,
similar to the operation of the add(Point)
method,
but contribute no further dimension beyond that.
If the resulting Rectangle
would have a dimension
too large to be expressed as an int
, the result
will have a dimension of Integer.MAX_VALUE
along
that dimension.
r
 the specified Rectangle
public void grow(int h, int v)
Rectangle
both horizontally and vertically.
This method modifies the Rectangle
so that it is
h
units larger on both the left and right side,
and v
units larger at both the top and bottom.
The new Rectangle
has (x  h, y  v)
as its upperleft corner,
width of (width + 2h)
,
and a height of (height + 2v)
.
If negative values are supplied for h
and
v
, the size of the Rectangle
decreases accordingly.
The grow
method will check for integer overflow
and underflow, but does not check whether the resulting
values of width
and height
grow
from negative to nonnegative or shrink from nonnegative
to negative.
h
 the horizontal expansionv
 the vertical expansionpublic boolean isEmpty()
RectangularShape
is empty.
When the RectangularShape
is empty, it encloses no
area.
isEmpty
in class RectangularShape
true
if the RectangularShape
is empty;
false
otherwise.public int outcode(double x, double y)
Rectangle2D
.
This method computes a binary OR of the appropriate mask values
indicating, for each side of this Rectangle2D
,
whether or not the specified coordinates are on the same side
of the edge as the rest of this Rectangle2D
.
outcode
in class Rectangle2D
x
 the specified X coordinatey
 the specified Y coordinate
Rectangle2D.OUT_LEFT
,
Rectangle2D.OUT_TOP
,
Rectangle2D.OUT_RIGHT
,
Rectangle2D.OUT_BOTTOM
public Rectangle2D createIntersection(Rectangle2D r)
Rectangle2D
object representing the
intersection of this Rectangle2D
with the specified
Rectangle2D
.
createIntersection
in class Rectangle2D
r
 the Rectangle2D
to be intersected with
this Rectangle2D
Rectangle2D
contained in both
the specified Rectangle2D
and in this
Rectangle2D
.public Rectangle2D createUnion(Rectangle2D r)
Rectangle2D
object representing the
union of this Rectangle2D
with the specified
Rectangle2D
.
createUnion
in class Rectangle2D
r
 the Rectangle2D
to be combined with
this Rectangle2D
Rectangle2D
containing both
the specified Rectangle2D
and this
Rectangle2D
.public boolean equals(Object obj)
The result is true
if and only if the argument is not
null
and is a Rectangle
object that has the
same upperleft corner, width, and height as
this Rectangle
.
equals
in class Rectangle2D
obj
 the Object
to compare with
this Rectangle
true
if the objects are equal;
false
otherwise.public String toString()
String
representing this
Rectangle
and its values.
toString
in class Object
String
representing this
Rectangle
object's coordinate and size values.

Jamaica 6.1 release 1  
PREV CLASS NEXT CLASS  FRAMES NO FRAMES  
SUMMARY: NESTED  FIELD  CONSTR  METHOD  DETAIL: FIELD  CONSTR  METHOD 