Module java.desktop

Package java.awt.geom

Class RectangularShape

java.lang.Object

java.awt.geom.RectangularShape

All Implemented Interfaces:

Shape, Cloneable

Direct Known Subclasses:

Arc2D, Ellipse2D, Rectangle2D, RoundRectangle2D

public abstract class RectangularShape
extends Object
implements Shape, Cloneable

RectangularShape is the base class for a number of Shape objects whose geometry is defined by a rectangular frame. This class does not directly specify any specific geometry by itself, but merely provides manipulation methods inherited by a whole category of Shape objects. The manipulation methods provided by this class can be used to query and modify the rectangular frame, which provides a reference for the subclasses to define their geometry.

Since:

1.2

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RectangularShape()	This is an abstract class that cannot be instantiated directly.

Method Summary

Modifier and Type	Method	Description
Object	clone()	Creates a new object of the same class and with the same contents as this object.
boolean	contains(Point2D p)	Tests if a specified Point2D is inside the boundary of the Shape, as described by the definition of insideness.
boolean	contains(Rectangle2D r)	Tests if the interior of the Shape entirely contains the specified Rectangle2D.
Rectangle	getBounds()	Returns an integer Rectangle that completely encloses the Shape.
double	getCenterX()	Returns the X coordinate of the center of the framing rectangle of the Shape in double precision.
double	getCenterY()	Returns the Y coordinate of the center of the framing rectangle of the Shape in double precision.
Rectangle2D	getFrame()	Returns the framing Rectangle2D that defines the overall shape of this object.
abstract double	getHeight()	Returns the height of the framing rectangle in double precision.
double	getMaxX()	Returns the largest X coordinate of the framing rectangle of the Shape in double precision.
double	getMaxY()	Returns the largest Y coordinate of the framing rectangle of the Shape in double precision.
double	getMinX()	Returns the smallest X coordinate of the framing rectangle of the Shape in double precision.
double	getMinY()	Returns the smallest Y coordinate of the framing rectangle of the Shape in double precision.
PathIterator	getPathIterator(AffineTransform at, double flatness)	Returns an iterator object that iterates along the Shape object's boundary and provides access to a flattened view of the outline of the Shape object's geometry.
abstract double	getWidth()	Returns the width of the framing rectangle in double precision.
abstract double	getX()	Returns the X coordinate of the upper-left corner of the framing rectangle in double precision.
abstract double	getY()	Returns the Y coordinate of the upper-left corner of the framing rectangle in double precision.
boolean	intersects(Rectangle2D r)	Tests if the interior of the Shape intersects the interior of a specified Rectangle2D.
abstract boolean	isEmpty()	Determines whether the RectangularShape is empty.
abstract void	setFrame(double x, double y, double w, double h)	Sets the location and size of the framing rectangle of this Shape to the specified rectangular values.
void	setFrame(Point2D loc, Dimension2D size)	Sets the location and size of the framing rectangle of this Shape to the specified Point2D and Dimension2D, respectively.
void	setFrame(Rectangle2D r)	Sets the framing rectangle of this Shape to be the specified Rectangle2D.
void	setFrameFromCenter(double centerX, double centerY, double cornerX, double cornerY)	Sets the framing rectangle of this Shape based on the specified center point coordinates and corner point coordinates.
void	setFrameFromCenter(Point2D center, Point2D corner)	Sets the framing rectangle of this Shape based on a specified center Point2D and corner Point2D.
void	setFrameFromDiagonal(double x1, double y1, double x2, double y2)	Sets the diagonal of the framing rectangle of this Shape based on the two specified coordinates.
void	setFrameFromDiagonal(Point2D p1, Point2D p2)	Sets the diagonal of the framing rectangle of this Shape based on two specified Point2D objects.

Methods declared in class java.lang.Object

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

Methods declared in interface java.awt.Shape

contains, contains, getBounds2D, getPathIterator, intersects

Constructor Details

RectangularShape

protected RectangularShape()

This is an abstract class that cannot be instantiated directly.

Since:

1.2

See Also:

• Arc2D
• Ellipse2D
• Rectangle2D
• RoundRectangle2D

Method Details

getX

public abstract double getX()

Returns the X coordinate of the upper-left corner of the framing rectangle in double precision.

Returns:

the X coordinate of the upper-left corner of the framing rectangle.

Since:

1.2

getY

public abstract double getY()

Returns the Y coordinate of the upper-left corner of the framing rectangle in double precision.

Returns:

the Y coordinate of the upper-left corner of the framing rectangle.

Since:

1.2

getWidth

public abstract double getWidth()

Returns the width of the framing rectangle in double precision.

Returns:

the width of the framing rectangle.

Since:

1.2

getHeight

public abstract double getHeight()

Returns the height of the framing rectangle in double precision.

Returns:

the height of the framing rectangle.

Since:

1.2

getMinX

public double getMinX()

Returns the smallest X coordinate of the framing rectangle of the Shape in double precision.

Returns:

the smallest X coordinate of the framing rectangle of the Shape.

Since:

1.2

getMinY

public double getMinY()

Returns the smallest Y coordinate of the framing rectangle of the Shape in double precision.

Returns:

the smallest Y coordinate of the framing rectangle of the Shape.

Since:

1.2

getMaxX

public double getMaxX()

Returns the largest X coordinate of the framing rectangle of the Shape in double precision.

Returns:

the largest X coordinate of the framing rectangle of the Shape.

Since:

1.2

getMaxY

public double getMaxY()

Returns the largest Y coordinate of the framing rectangle of the Shape in double precision.

Returns:

the largest Y coordinate of the framing rectangle of the Shape.

Since:

1.2

getCenterX

public double getCenterX()

Returns the X coordinate of the center of the framing rectangle of the Shape in double precision.

Returns:

the X coordinate of the center of the framing rectangle of the Shape.

Since:

1.2

getCenterY

public double getCenterY()

Returns the Y coordinate of the center of the framing rectangle of the Shape in double precision.

Returns:

the Y coordinate of the center of the framing rectangle of the Shape.

Since:

1.2

getFrame

public Rectangle2D getFrame()

Returns the framing Rectangle2D that defines the overall shape of this object.

Returns:

a Rectangle2D, specified in double coordinates.

Since:

1.2

See Also:

• setFrame(double, double, double, double)
• setFrame(Point2D, Dimension2D)
• setFrame(Rectangle2D)

isEmpty

public abstract boolean isEmpty()

Determines whether the RectangularShape is empty. When the RectangularShape is empty, it encloses no area.

Returns:

true if the RectangularShape is empty; false otherwise.

Since:

1.2

setFrame

public abstract void setFrame(double x,
 double y,
 double w,
 double h)

Sets the location and size of the framing rectangle of this Shape to the specified rectangular values.

Parameters:

x - the X coordinate of the upper-left corner of the specified rectangular shape

y - the Y coordinate of the upper-left corner of the specified rectangular shape

w - the width of the specified rectangular shape

h - the height of the specified rectangular shape

Since:

1.2

See Also:

• getFrame()

setFrame

public void setFrame(Point2D loc,
 Dimension2D size)

Sets the location and size of the framing rectangle of this Shape to the specified Point2D and Dimension2D, respectively. The framing rectangle is used by the subclasses of RectangularShape to define their geometry.

Parameters:

loc - the specified Point2D

size - the specified Dimension2D

Since:

1.2

See Also:

• getFrame()

setFrame

public void setFrame(Rectangle2D r)

Sets the framing rectangle of this Shape to be the specified Rectangle2D. The framing rectangle is used by the subclasses of RectangularShape to define their geometry.

Parameters:

r - the specified Rectangle2D

Since:

1.2

See Also:

• getFrame()

setFrameFromDiagonal

public void setFrameFromDiagonal(double x1,
 double y1,
 double x2,
 double y2)

Sets the diagonal of the framing rectangle of this Shape based on the two specified coordinates. The framing rectangle is used by the subclasses of RectangularShape to define their geometry.

Parameters:

x1 - the X coordinate of the start point of the specified diagonal

y1 - the Y coordinate of the start point of the specified diagonal

x2 - the X coordinate of the end point of the specified diagonal

y2 - the Y coordinate of the end point of the specified diagonal

Since:

1.2

setFrameFromDiagonal

public void setFrameFromDiagonal(Point2D p1,
 Point2D p2)

Sets the diagonal of the framing rectangle of this Shape based on two specified Point2D objects. The framing rectangle is used by the subclasses of RectangularShape to define their geometry.

Parameters:

p1 - the start Point2D of the specified diagonal

p2 - the end Point2D of the specified diagonal

Since:

1.2

setFrameFromCenter

public void setFrameFromCenter(double centerX,
 double centerY,
 double cornerX,
 double cornerY)

Sets the framing rectangle of this Shape based on the specified center point coordinates and corner point coordinates. The framing rectangle is used by the subclasses of RectangularShape to define their geometry.

Parameters:

centerX - the X coordinate of the specified center point

centerY - the Y coordinate of the specified center point

cornerX - the X coordinate of the specified corner point

cornerY - the Y coordinate of the specified corner point

Since:

1.2

setFrameFromCenter

public void setFrameFromCenter(Point2D center,
 Point2D corner)

Sets the framing rectangle of this Shape based on a specified center Point2D and corner Point2D. The framing rectangle is used by the subclasses of RectangularShape to define their geometry.

Parameters:

center - the specified center Point2D

corner - the specified corner Point2D

Since:

1.2

contains

public boolean contains(Point2D p)

Tests if a specified Point2D is inside the boundary of the Shape, as described by the definition of insideness.

Specified by:

contains in interface Shape

Parameters:

p - the specified Point2D to be tested

Returns:

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

Since:

1.2

intersects

public boolean intersects(Rectangle2D r)

Tests if the interior of the Shape intersects the interior of a specified Rectangle2D. The Shape.intersects() method allows a Shape implementation to 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 for some Shapes this method might return true even though the Rectangle2D does not intersect the Shape. The Area class performs more accurate computations of geometric intersection than most Shape objects and therefore can be used if a more precise answer is required.

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.

Since:

1.2

See Also:

• Shape.intersects(double, double, double, double)

contains

public boolean contains(Rectangle2D r)

Tests if the interior of the Shape entirely contains the specified Rectangle2D. The Shape.contains() method allows a Shape implementation to 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 for some Shapes this method might return false even though the Shape contains the Rectangle2D. The Area class performs more accurate geometric computations than most Shape objects and therefore can be used 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.

Since:

1.2

See Also:

• Shape.contains(double, double, double, double)

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.

Note that the definition of insideness can lead to situations where points on the defining outline of the shape may not be considered contained in the returned bounds object, but only in cases where those points are also not considered contained in the original shape.

If a point is inside the shape according to the contains(point) method, then it must be inside the returned Rectangle bounds object according to the contains(point) method of the bounds. Specifically:

shape.contains(x,y) requires bounds.contains(x,y)

If a point is not inside the shape, then it might still be contained in the bounds object:

bounds.contains(x,y) does not imply shape.contains(x,y)

Specified by:

getBounds in interface Shape

Returns:

an integer Rectangle that completely encloses the Shape.

Since:

1.2

See Also:

• Shape.getBounds2D()

getPathIterator

public PathIterator getPathIterator(AffineTransform at,
 double flatness)

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

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

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. An optional AffineTransform can be specified so that the coordinates returned in the iteration are transformed accordingly.

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 PathIterator object that provides access to the Shape object's flattened geometry.

Since:

1.2

clone

public Object clone()

Creates a new object of the same class and with the same contents as this object.

Overrides:

clone in class Object

Returns:

a clone of this instance.

Throws:

OutOfMemoryError - if there is not enough memory.

Since:

1.2

See Also:

• Cloneable