# Class RoundRectangle2D

java.lang.Object
java.awt.geom.RectangularShape
java.awt.geom.RoundRectangle2D

All Implemented Interfaces:
  `Shape`, `Cloneable`

Direct Known Subclasses:
  `RoundRectangle2D.Double`, `RoundRectangle2D.Float`

public abstract class RoundRectangle2D extends RectangularShape
The `RoundRectangle2D` class defines a rectangle with rounded corners defined by a location `(x,y)`, a dimension `(w x h)`, and the width and height of an arc with which to round the corners.

This class is the abstract superclass for all objects that store a 2D rounded 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`
  `RoundRectangle2D.Double`
  The `Double` class defines a rectangle with rounded corners all specified in `double` coordinates.
  `static class`
  `RoundRectangle2D.Float`
  The `Float` class defines a rectangle with rounded corners all specified in `float` coordinates.

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `RoundRectangle2D()`
  This is an abstract class that cannot be instantiated directly.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `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.
  `boolean`
  `equals(Object obj)`
  Determines whether or not the specified `Object` is equal to this `RoundRectangle2D`.
  `abstract double`
  `getArcHeight()`
  Gets the height of the arc that rounds off the corners.
  `abstract double`
  `getArcWidth()`
  Gets the width of the arc that rounds off the corners.
  `PathIterator`
  `getPathIterator(AffineTransform at)`
  Returns an iteration object that defines the boundary of this `RoundRectangle2D`.
  `int`
  `hashCode()`
  Returns the hashcode for this `RoundRectangle2D`.
  `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.
  `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.
  `abstract void`
  `setRoundRect(double x, double y, double w, double h, double arcWidth, double arcHeight)`
  Sets the location, size, and corner radii of this `RoundRectangle2D` to the specified `double` values.
  `void`
  `setRoundRect(RoundRectangle2D rr)`
  Sets this `RoundRectangle2D` to be the same as the specified `RoundRectangle2D`.

  ### Methods declared in class java.awt.geom.RectangularShape

  `clone, contains, contains, getBounds, getCenterX, getCenterY, getFrame, getHeight, getMaxX, getMaxY, getMinX, getMinY, getPathIterator, getWidth, getX, getY, intersects, isEmpty, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal`

  ### Methods declared in class java.lang.Object

  `finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

  ### Methods declared in interface java.awt.Shape

  `getBounds2D`

- ## Constructor Details

  - ### RoundRectangle2D

    protected RoundRectangle2D()
    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:
      - `RoundRectangle2D.Float`
      - `RoundRectangle2D.Double`

- ## Method Details

  - ### getArcWidth

    public abstract double getArcWidth()
    Gets the width of the arc that rounds off the corners.
    Returns:
      the width of the arc that rounds off the corners of this `RoundRectangle2D`.
    Since:
      1.2

  - ### getArcHeight

    public abstract double getArcHeight()
    Gets the height of the arc that rounds off the corners.
    Returns:
      the height of the arc that rounds off the corners of this `RoundRectangle2D`.
    Since:
      1.2

  - ### setRoundRect

    public abstract void setRoundRect(double x, double y, double w, double h, double arcWidth, double arcHeight)
    Sets the location, size, and corner radii of this `RoundRectangle2D` to the specified `double` values.
    Parameters:
      `x` - the X coordinate to which to set the location of this `RoundRectangle2D`
      `y` - the Y coordinate to which to set the location of this `RoundRectangle2D`
      `w` - the width to which to set this `RoundRectangle2D`
      `h` - the height to which to set this `RoundRectangle2D`
      `arcWidth` - the width to which to set the arc of this `RoundRectangle2D`
      `arcHeight` - the height to which to set the arc of this `RoundRectangle2D`
    Since:
      1.2

  - ### setRoundRect

    public void setRoundRect(RoundRectangle2D rr)
    Sets this `RoundRectangle2D` to be the same as the specified `RoundRectangle2D`.
    Parameters:
      `rr` - the specified `RoundRectangle2D`
    Since:
      1.2

  - ### setFrame

    public 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.
    Specified by:
      `setFrame` in class `RectangularShape`
    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:
      - `RectangularShape.getFrame()`

  - ### 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)`

  - ### getPathIterator

    public PathIterator getPathIterator(AffineTransform at)
    Returns an iteration object that defines the boundary of this `RoundRectangle2D`. The iterator for this class is multi-threaded safe, which means that this `RoundRectangle2D` class guarantees that modifications to the geometry of this `RoundRectangle2D` 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 `RoundRectangle2D`, one segment at a time.
    Since:
      1.2

  - ### hashCode

    public int hashCode()
    Returns the hashcode for this `RoundRectangle2D`.
    Overrides:
      `hashCode` in class `Object`
    Returns:
      the hashcode for this `RoundRectangle2D`.
    Since:
      1.6
    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 `RoundRectangle2D`. The specified `Object` is equal to this `RoundRectangle2D` if it is an instance of `RoundRectangle2D` and if its location, size, and corner arc dimensions are the same as this `RoundRectangle2D`.
    Overrides:
      `equals` in class `Object`
    Parameters:
      `obj` - an `Object` to be compared with this `RoundRectangle2D`.
    Returns:
      `true` if `obj` is an instance of `RoundRectangle2D` and has the same values; `false` otherwise.
    Since:
      1.6
    See Also:
      - `Object.hashCode()`
      - `HashMap`