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Rectangle

Name

Rectangle

[Graphic: Figure from the text]

Description

The Rectangle class represents a rectangle by combining its origin (a pair of x and y coordinates) with its size (a width and a height).

Class Definition

public class java.awt.Rectangle
    extends java.lang.Object
    implements java.awt.Shape, java.io.Serializable {
  
  // Variables
  pubic int height;
  public int width;
  public int x;
  public int y;
  
  // Constructors
  public Rectangle();
  public Rectangle (int width, int height);
  public Rectangle (int x, int y, int width, int height);
  public Rectangle (Dimension d);
  public Rectangle (Point p);
  public Rectangle (Point p, Dimension d);
  public Rectangle (Rectangle r); (New)
  
  // Instance Methods
  public void add (int newX, int newY);
  public void add (Point p);
  public void add (Rectangle r);
  public boolean contains (int x, int y); (New)
  public boolean contains (Point p); (New)
  public boolean equals (Object object);
  public Rectangle getBounds(); (New)
  public Point getLocation(); (New)
  public Dimension getSize(); (New)
  public void grow (int horizontal, int vertical);
  public int hashCode();
  public boolean inside (int x, int y); (Deprecated)
  public Rectangle intersection (Rectangle r);
  public boolean intersects (Rectangle r);
  public boolean isEmpty();
  public void move (int x, int y); (Deprecated)
  public void reshape (int x, int y, int width, int height); (Deprecated)
  public void resize (int width, int height); (Deprecated)
  public void setBounds (Rectangle r); (New)
  public void setBounds (int x, int y, int width, int height); (New)
  public void setLocation (int x, int y); (New)
  public void setLocation (Point p); (New)
  public void setSize (int width, int height); (New)
  public void setSize (Dimension d); (New)
  public String toString();
  public void translate (int x, int y);
  public Rectangle union (Rectangle r);
}

Variables

height

public int height

The height of the Rectangle.

width

public int width

The width of the Rectangle.

x

public int x

The x coordinate of the Rectangle's upper left corner (its origin).

y

public int y

The y coordinate of the Rectangle's upper left corner (its origin).

Constructors

Rectangle

public Rectangle()

Description

Constructs an empty Rectangle object with an origin of (0, 0) and dimensions of 0 x 0.

public Rectangle (int width, int height)

Parameters

width

width of Rectangle

height

height of Rectangle

Description

Constructs a Rectangle object with an origin of (0, 0) and dimensions of width x height.

public Rectangle (int x, int y, int width, int height)

Parameters

x

x coordinate of the Rectangle's origin

y

y coordinate of the Rectangle's origin

width

width of Rectangle

height

height of Rectangle

Description

Constructs a Rectangle object with an origin of (x, y) and dimensions of width x height.

public Rectangle (Dimension d)

Parameters

d

dimensions of Rectangle

Description

Constructs a Rectangle object with an origin of (0, 0) and dimensions of d.width x d.height.

public Rectangle (Point p)

Parameters

p

origin of Rectangle

Description

Constructs an empty Rectangle object with an origin of (p.x, p.y) and dimensions of 0 x 0.

public Rectangle (Point p, Dimension d)

Parameters

p

origin of Rectangle

d

dimensions of Rectangle

Description

Constructs a Rectangle object with an origin of (p.x, p.y) and dimensions of d.width x d.height.

public Rectangle (Rectangle r) (New)

Parameters

r

original Rectangle

Description

Constructs copy of the given Rectangle.

Instance Methods

add

public void add (int newX, int newY)

Parameters

newX

The x-coordinate of a point to incorporate within the Rectangle.

newY

The y-coordinate of a point to incorporate within the Rectangle.

Description

Extends the Rectangle so that the point (newX, newY) is within it.

public void add (Point p)

Parameters

p

The new Point to add to the Rectangle.

Description

Extends the Rectangle so that the point p is within it.

public void add (Rectangle r)

Parameters

r

The Rectangle being added to the current Rectangle.

Description

Extends the Rectangle to include the Rectangle r.

contains

public boolean contains (int x, int y) (New)

Parameters

x

The x coordinate to test.

y

The y coordinate to test.

Returns

true if the Rectangle contains the point; false otherwise.

public boolean contains (Point p) (New)

Parameters

p

The point to be tested.

Returns

true if the Rectangle contains the point; false otherwise.

equals

public boolean equals (Object object)

Parameters

object

The object to compare.

Returns

true if both Rectangles have the same origin, width, and height; false otherwise.

Overrides

Object.equals(Object)

Description

Compares two different Rectangle instances for equivalence.

getBounds

public Rectangle getBounds() (New)

Implements

Shape.getBounds()

Returns

Bounding Rectangle.

getLocation

public Point getLocation() (New)

Returns

Position of the rectangle.

Description

Gets the current position of this Rectangle.

getSize

public Dimension getSize() (New)

Returns

Dimensions of the rectangle.

Description

Gets width and height of the rectangle.

grow

public void grow (int horizontal, int vertical)

Parameters

horizontal

Amount to extend Rectangle in horizontal direction on both the left and right sides.

vertical

Amount to extend Rectangle in vertical direction on both the top and the bottom.

Description

Increases the rectangle's dimensions.

hashCode

public int hashCode()

Returns

A hashcode to use when using the Rectangle as a key in a Hashtable.

Overrides

Object.hashCode()

Description

Generates a hashcode for the Rectangle.

inside

public boolean inside (int x, int y) (Deprecated)

Parameters

x

The x coordinate to check.

y

The y coordinate to check.

Returns

true if (x, y) falls within the Rectangle, false otherwise.

Description

Checks to see if the point (x, y) is within the Rectangle. Replaced by contains(int, int).

intersection

public Rectangle intersection (Rectangle r)

Parameters

r

Rectangle to add to the current Rectangle.

Returns

A new Rectangle consisting of all points in both the current Rectangle and r.

Description

Generates a new Rectangle that is the intersection of r and the current Rectangle.

intersects

public boolean intersects (Rectangle r)

Parameters

r

Rectangle to check.

Returns

true if any points in r are also in the current Rectangle, false otherwise.

Description

Checks to see if r crosses the Rectangle.

isEmpty

public boolean isEmpty()

Returns

true if the Rectangle is empty, false otherwise.

Description

Determines if the rectangle is dimensionless (i.e., width or height are less than or equal to 0).

move

public void move (int x, int y) (Deprecated)

Parameters

x

The new x coordinate of the Rectangle's upper left corner.

y

The new y coordinate of the Rectangle's upper left corner.

Description

Changes the Rectangle's origin to (x, y). Replaced by setLocation(int, int).

reshape

public void reshape (int x, int y, int width, int height) (Deprecated)

Parameters

x

The new x coordinate of the Rectangle's upper left corner.

y

The new y coordinate of the Rectangle's upper left corner.

width

The new width.

height

The new height.

Description

Changes Rectangle's origin and dimensions. Replaced by setBounds(int, int, int, int).

resize

public void resize (int width, int height) (Deprecated)

Parameters

width

The new width.

height

The new height.

Description

Changes Rectangle's dimensions. Replaced by setSize(int, int).

setBounds

public void setBounds (Rectangle r) (New)

Parameters

r

A Rectangle describing the new bounds.

Description

Changes Rectangle's location and size.

public void setBounds (int x, int y, int width, int height) [New in 1.1]

Parameters

x

The new x coordinate of the Rectangle's upper left corner.

y

The new y coordinate of the Rectangle's upper left corner.

width

The new width.

height

The new height.

Description

Changes Rectangle's location and size.

setLocation

public void setLocation (int x, int y) (New)

Parameters

x

New horizontal position.

y

New vertical position.

Description

Relocates the rectangle.

public void setLocation (Point p) (New)

Parameters

p

New position for component.

Description

Relocates the rectangle.

setSize

public void setSize (int width, int height) (New)

Parameters

width

New width.

height

New height.

Description

Resizes the rectangle.

public void setSize (Dimension d) (New)

Parameters

d

New dimensions.

Description

Resizes the rectangle.

toString

public String toString()

Returns

A string representation of the Rectangle object.

Overrides

Object.toString()

translate

public void translate (int deltax, int deltay)

Parameters

deltax

Amount to move Rectangle horizontally.

deltay

Amount to move Rectangle vertically.

Description

Moves the Rectangle's origin to (x+deltax, y+deltay).

union

public Rectangle union (Rectangle r)

Parameters

r

Rectangle to determine union with.

Returns

The smallest Rectangle containing both r and the current Rectangle.

Description

Generates a new Rectangle by combining r and the current Rectangle.

See Also

Dimension, Object, Point, String


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