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Rectangle2D (Java SE 19 & JDK 19)

All Implemented Interfaces:

Shape, Cloneable

Direct Known Subclasses:

Rectangle, Rectangle2D.Double, Rectangle2D.Float

The

class describes a rectangle defined by a location

and dimension

.

This class is only the abstract superclass for all objects that store a 2D rectangle. The actual storage representation of the coordinates is left to the subclass.

Since:

1.2

• Nested Class Summary

  Nested Classes

  static class 

  The Double class defines a rectangle specified in double coordinates.

  static class 

  The Float class defines a rectangle specified in float coordinates.

• Field Summary

  Fields

  static final int

  The bitmask that indicates that a point lies below this Rectangle2D.

  static final int

  The bitmask that indicates that a point lies to the left of this Rectangle2D.

  static final int

  The bitmask that indicates that a point lies to the right of this Rectangle2D.

  static final int

  The bitmask that indicates that a point lies above this Rectangle2D.

• Constructor Summary

  Constructors

  protected

  This is an abstract class that cannot be instantiated directly.

• Method Summary

  void

  add(double newx, double newy)

  Adds a point, specified by the double precision arguments newx and newy, to this Rectangle2D.

  void

  Adds the Point2D object pt to this Rectangle2D.

  void

  Adds a Rectangle2D object to this Rectangle2D.

  boolean

  Tests if the specified coordinates are inside the boundary of the

  Shape

  , as described by the

  definition of insideness

  .

  boolean

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

  Tests if the interior of the Shape entirely contains the specified rectangular area.

  Returns a new Rectangle2D object representing the intersection of this Rectangle2D with the specified Rectangle2D.

  Returns a new Rectangle2D object representing the union of this Rectangle2D with the specified Rectangle2D.

  boolean

  Determines whether or not the specified Object is equal to this Rectangle2D.

  Returns a high precision and more accurate bounding box of the Shape than the getBounds method.

  Returns an iteration object that defines the boundary of this Rectangle2D.

  Returns an iteration object that defines the boundary of the flattened Rectangle2D.

  int

  Returns the hashcode for this Rectangle2D.

  static void

  Intersects the pair of specified source Rectangle2D objects and puts the result into the specified destination Rectangle2D object.

  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

  Tests if the specified line segment intersects the interior of this Rectangle2D.

  boolean

  Tests if the specified line segment intersects the interior of this Rectangle2D.

  abstract int

  Determines where the specified coordinates lie with respect to this Rectangle2D.

  int

  Determines where the specified

  Point2D

  lies with respect to this

  Rectangle2D

  .

  void

  setFrame(double x, double y, double w, double h)

  Sets the location and size of the outer bounds of this Rectangle2D to the specified rectangular values.

  abstract void

  setRect(double x, double y, double w, double h)

  Sets the location and size of this Rectangle2D to the specified double values.

  void

  Sets this Rectangle2D to be the same as the specified Rectangle2D.

  static void

  Unions the pair of source Rectangle2D objects and puts the result into the specified destination Rectangle2D object.

  Methods declared in class java.awt.geom.RectangularShapeclone, contains, contains, getBounds, getCenterX, getCenterY, getFrame, getHeight, getMaxX, getMaxY, getMinX, getMinY, getWidth, getX, getY, intersects, isEmpty, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal

• Field Details
  • OUT_LEFT

    public static final int OUT_LEFT

    The bitmask that indicates that a point lies to the left of this Rectangle2D.

    Since:

    1.2

    See Also:

    • Constant Field Values

  • OUT_TOP

    public static final int OUT_TOP

    The bitmask that indicates that a point lies above this Rectangle2D.

    Since:

    1.2

    See Also:

    • Constant Field Values

  • OUT_RIGHT

    public static final int OUT_RIGHT

    The bitmask that indicates that a point lies to the right of this Rectangle2D.

    Since:

    1.2

    See Also:

    • Constant Field Values

  • OUT_BOTTOM

    public static final int OUT_BOTTOM

    The bitmask that indicates that a point lies below this Rectangle2D.

    Since:

    1.2

    See Also:

    • Constant Field Values

• Constructor Details
  • Rectangle2D

    protected Rectangle2D()

    This is an abstract class that cannot be instantiated directly. Type-specific implementation subclasses are available for instantiation and provide a number of formats for storing the information necessary to satisfy the various accessor methods below.

    Since:

    1.2

    See Also:

    • Rectangle2D.Float
    • Rectangle2D.Double
    • Rectangle

• Method Details
  • setRect

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

    Sets the location and size of this Rectangle2D to the specified double values.

    Parameters:

    x - the X coordinate of the upper-left corner of this Rectangle2D

    y - the Y coordinate of the upper-left corner of this Rectangle2D

    w - the width of this Rectangle2D

    h - the height of this Rectangle2D

    Since:

    1.2

  • setRect

    Sets this Rectangle2D to be the same as the specified Rectangle2D.

    Parameters:

    r - the specified Rectangle2D

    Since:

    1.2

  • intersectsLine

    public boolean intersectsLine(double x1, double y1, double x2, double y2)

    Tests if the specified line segment intersects the interior of this Rectangle2D.

    Parameters:

    x1 - the X coordinate of the start point of the specified line segment

    y1 - the Y coordinate of the start point of the specified line segment

    x2 - the X coordinate of the end point of the specified line segment

    y2 - the Y coordinate of the end point of the specified line segment

    Returns:

    true if the specified line segment intersects the interior of this Rectangle2D; false otherwise.

    Since:

    1.2

  • intersectsLine public boolean intersectsLine(Line2D l)

    Tests if the specified line segment intersects the interior of this Rectangle2D.

    Parameters:

    l - the specified Line2D to test for intersection with the interior of this Rectangle2D

    Returns:

    true if the specified Line2D intersects the interior of this Rectangle2D; false otherwise.

    Since:

    1.2

  • outcode

    public abstract int outcode(double x, double y)

    Determines where the specified coordinates lie with respect to this 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.

    Parameters:

    x - the specified X coordinate

    y - the specified Y coordinate

    Returns:

    the logical OR of all appropriate out codes.

    Since:

    1.2

    See Also:

    • OUT_LEFT
    • OUT_TOP
    • OUT_RIGHT
    • OUT_BOTTOM

  • outcode

    Determines where the specified

    Point2D

    lies with respect to this

    Rectangle2D

    . This method computes a binary OR of the appropriate mask values indicating, for each side of this

    Rectangle2D

    , whether or not the specified

    Point2D

    is on the same side of the edge as the rest of this

    Rectangle2D

    .

    Parameters:

    p - the specified Point2D

    Returns:

    the logical OR of all appropriate out codes.

    Since:

    1.2

    See Also:

    • OUT_LEFT
    • OUT_TOP
    • OUT_RIGHT
    • OUT_BOTTOM

  • setFrame

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

    Sets the location and size of the outer bounds of this Rectangle2D to the specified rectangular values.

    Specified by:

    setFrame in class RectangularShape

    Parameters:

    x - the X coordinate of the upper-left corner of this Rectangle2D

    y - the Y coordinate of the upper-left corner of this Rectangle2D

    w - the width of this Rectangle2D

    h - the height of this Rectangle2D

    Since:

    1.2

    See Also:

    • RectangularShape.getFrame()

  • 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.

    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 Rectangle2D bounds object according to the contains(point) method of the bounds. Specifically:

    shape.contains(p) requires bounds.contains(p)

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

    bounds.contains(p) does not imply shape.contains(p)

    Returns:

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

    Since:

    1.2

    See Also:

    • Shape.getBounds()

  • contains

    public boolean contains(double x, double y)

    Tests if the specified coordinates are inside the boundary of the

    Shape

    , as described by the

    definition of insideness

    .

    Parameters:

    x - the specified X coordinate to be tested

    y - the specified Y coordinate to be tested

    Returns:

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

    Since:

    1.2

  • 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.

    The Shape.intersects() method allows a Shape implementation to 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 for some

    Shapes

    this method might return

    true

    even though the rectangular area 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.

    Parameters:

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

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

    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.

    Since:

    1.2

    See Also:

    • Area

  • 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 rectangular area to be considered contained within the

    Shape

    .

    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 rectangular area are prohibitively expensive.

    This means that for some

    Shapes

    this method might return

    false

    even though the

    Shape

    contains the rectangular area. The

    Area

    class performs more accurate geometric computations than most

    Shape

    objects and therefore can be used if a more precise answer is required.

    Parameters:

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

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

    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.

    Since:

    1.2

    See Also:

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

  • createIntersection

    Returns a new Rectangle2D object representing the intersection of this Rectangle2D with the specified Rectangle2D.

    Parameters:

    r - the Rectangle2D to be intersected with this Rectangle2D

    Returns:

    the largest Rectangle2D contained in both the specified Rectangle2D and in this Rectangle2D.

    Since:

    1.2

  • intersect

    Intersects the pair of specified source Rectangle2D objects and puts the result into the specified destination Rectangle2D object. One of the source rectangles can also be the destination to avoid creating a third Rectangle2D object, but in this case the original points of this source rectangle will be overwritten by this method.

    Parameters:

    src1 - the first of a pair of Rectangle2D objects to be intersected with each other

    src2 - the second of a pair of Rectangle2D objects to be intersected with each other

    dest - the Rectangle2D that holds the results of the intersection of src1 and src2

    Since:

    1.2

  • createUnion

    Returns a new Rectangle2D object representing the union of this Rectangle2D with the specified Rectangle2D.

    Parameters:

    r - the Rectangle2D to be combined with this Rectangle2D

    Returns:

    the smallest Rectangle2D containing both the specified Rectangle2D and this Rectangle2D.

    Since:

    1.2

  • union

    Unions the pair of source Rectangle2D objects and puts the result into the specified destination Rectangle2D object. One of the source rectangles can also be the destination to avoid creating a third Rectangle2D object, but in this case the original points of this source rectangle will be overwritten by this method.

    Parameters:

    src1 - the first of a pair of Rectangle2D objects to be combined with each other

    src2 - the second of a pair of Rectangle2D objects to be combined with each other

    dest - the Rectangle2D that holds the results of the union of src1 and src2

    Since:

    1.2

  • add

    public void add(double newx, double newy)

    Adds a point, specified by the double precision arguments

    newx

    and

    newy

    , to this

    Rectangle2D

    . The resulting

    Rectangle2D

    is the smallest

    Rectangle2D

    that contains both the original

    Rectangle2D

    and the specified point.

    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.

    Parameters:

    newx - the X coordinate of the new point

    newy - the Y coordinate of the new point

    Since:

    1.2

  • add

    Adds the

    Point2D

    object

    pt

    to this

    Rectangle2D

    . The resulting

    Rectangle2D

    is the smallest

    Rectangle2D

    that contains both the original

    Rectangle2D

    and the specified

    Point2D

    .

    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.

    Parameters:

    pt - the new Point2D to add to this Rectangle2D.

    Since:

    1.2

  • add

    Adds a Rectangle2D object to this Rectangle2D. The resulting Rectangle2D is the union of the two Rectangle2D objects.

    Parameters:

    r - the Rectangle2D to add to this Rectangle2D.

    Since:

    1.2

  • getPathIterator

    Returns an iteration object that defines the boundary of this Rectangle2D. The iterator for this class is multi-threaded safe, which means that this Rectangle2D class guarantees that modifications to the geometry of this Rectangle2D object do not affect any iterations of that geometry that are already in process.

    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:

    the PathIterator object that returns the geometry of the outline of this Rectangle2D, one segment at a time.

    Since:

    1.2

  • getPathIterator

    Returns an iteration object that defines the boundary of the flattened Rectangle2D. Since rectangles are already flat, the flatness parameter is ignored. The iterator for this class is multi-threaded safe, which means that this Rectangle2D class guarantees that modifications to the geometry of this Rectangle2D object do not affect any iterations of that geometry that are already in process.

    Specified by:

    getPathIterator in interface Shape

    Overrides:

    getPathIterator in class RectangularShape

    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. Since rectangles are already flat, the flatness parameter is ignored.

    Returns:

    the PathIterator object that returns the geometry of the outline of this Rectangle2D, one segment at a time.

    Since:

    1.2

  • hashCode

    public int hashCode()

    Returns the hashcode for this Rectangle2D.

    Overrides:

    hashCode in class Object

    Returns:

    the hashcode for this Rectangle2D.

    Since:

    1.2

    See Also:

    • Object.equals(java.lang.Object)
    • System.identityHashCode(java.lang.Object)

  • equals public boolean equals(Object obj)

    Determines whether or not the specified Object is equal to this Rectangle2D. The specified Object is equal to this Rectangle2D if it is an instance of Rectangle2D and if its location and size are the same as this Rectangle2D.

    Overrides:

    equals in class Object

    Parameters:

    obj - an Object to be compared with this Rectangle2D.

    Returns:

    true if obj is an instance of Rectangle2D and has the same values; false otherwise.

    Since:

    1.2

    See Also:

    • Object.hashCode()
    • HashMap

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