Module java.desktop
Package java.awt.geom

Class Rectangle2D

All Implemented Interfaces:
Shape, Cloneable
Direct Known Subclasses:
Rectangle, Rectangle2D.Double, Rectangle2D.Float

public abstract class Rectangle2D extends RectangularShape
The Rectangle2D class describes a rectangle defined by a location (x,y) and dimension (w x h).

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
    Modifier and Type
    Class
    Description
    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
    Modifier and Type
    Field
    Description
    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
    Modifier
    Constructor
    Description
    protected
    This is an abstract class that cannot be instantiated directly.
  • Method Summary

    Modifier and Type
    Method
    Description
    void
    add​(double newx, double newy)
    Adds a point, specified by the double precision arguments newx and newy, to this Rectangle2D.
    void
    add​(Point2D pt)
    Adds the Point2D object pt to this Rectangle2D.
    void
    Adds a Rectangle2D object to this Rectangle2D.
    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.
    boolean
    contains​(double x, double y, double w, double h)
    Tests if the interior of the Shape entirely contains the specified rectangular area.
    abstract Rectangle2D
    Returns a new Rectangle2D object representing the intersection of this Rectangle2D with the specified Rectangle2D.
    abstract Rectangle2D
    Returns a new Rectangle2D object representing the union of this Rectangle2D with the specified Rectangle2D.
    boolean
    equals​(Object obj)
    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.
    getPathIterator​(AffineTransform at, double flatness)
    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
    intersectsLine​(double x1, double y1, double x2, double y2)
    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
    outcode​(double x, double y)
    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
    union​(Rectangle2D src1, Rectangle2D src2, Rectangle2D dest)
    Unions the pair of source Rectangle2D objects and puts the result into the specified destination Rectangle2D object.

    Methods declared in class java.lang.Object

    finalize, getClass, notify, notifyAll, toString, wait, wait, wait
  • 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

      public void setRect(Rectangle2D r)
      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

      public int outcode(Point2D p)
      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

      public Rectangle2D 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

      public abstract Rectangle2D createIntersection(Rectangle2D r)
      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

      public static void intersect(Rectangle2D src1, Rectangle2D src2, Rectangle2D dest)
      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

      public abstract Rectangle2D createUnion(Rectangle2D r)
      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

      public static void union(Rectangle2D src1, Rectangle2D src2, Rectangle2D dest)
      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

      public void add(Point2D pt)
      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

      public void add(Rectangle2D r)
      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

      public PathIterator getPathIterator(AffineTransform at)
      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

      public PathIterator getPathIterator(AffineTransform at, double flatness)
      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