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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/Shape.html below:

Shape (Java SE 19 & JDK 19)

All Known Implementing Classes:

Arc2D, Arc2D.Double, Arc2D.Float, Area, BasicTextUI.BasicCaret, CubicCurve2D, CubicCurve2D.Double, CubicCurve2D.Float, DefaultCaret, Ellipse2D, Ellipse2D.Double, Ellipse2D.Float, GeneralPath, Line2D, Line2D.Double, Line2D.Float, Path2D, Path2D.Double, Path2D.Float, Polygon, QuadCurve2D, QuadCurve2D.Double, QuadCurve2D.Float, Rectangle, Rectangle2D, Rectangle2D.Double, Rectangle2D.Float, RectangularShape, RoundRectangle2D, RoundRectangle2D.Double, RoundRectangle2D.Float

public interface Shape

The

interface provides definitions for objects that represent some form of geometric shape. The

is described by a

object, which can express the outline of the

as well as a rule for determining how the outline divides the 2D plane into interior and exterior points. Each

object provides callbacks to get the bounding box of the geometry, determine whether points or rectangles lie partly or entirely within the interior of the

, and retrieve a

object that describes the trajectory path of the

outline.

Definition of insideness: A point is considered to lie inside a Shape if and only if:

• it lies completely inside the Shape boundary or
• it lies exactly on the Shape boundary and the space immediately adjacent to the point in the increasing X direction is entirely inside the boundary or
• it lies exactly on a horizontal boundary segment and the space immediately adjacent to the point in the increasing Y direction is inside the boundary.

The contains and intersects methods consider the interior of a Shape to be the area it encloses as if it were filled. This means that these methods consider unclosed shapes to be implicitly closed for the purpose of determining if a shape contains or intersects a rectangle or if a shape contains a point.

Since:

1.2

See Also:

• PathIterator
• AffineTransform
• FlatteningPathIterator
• GeneralPath

• Method Summary

  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.

  boolean

  boolean

  Tests if the interior of the Shape entirely contains the specified Rectangle2D.

  Returns an integer

  Rectangle

  that completely encloses the

  Shape

  .

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

  Returns an iterator object that iterates along the Shape boundary and provides access to the geometry of the Shape outline.

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

  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 interior of the Shape intersects the interior of a specified Rectangle2D.

• Method Details
  • 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)

    Returns:

    an integer Rectangle that completely encloses the Shape.

    Since:

    1.2

    See Also:

    • getBounds2D()

  • 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:

    • getBounds()

  • contains

    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

  • contains

    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

    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

  • intersects

    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.

    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:

    • intersects(double, double, double, double)

  • contains

    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
    • intersects(double, double, double, double)

  • contains

    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.

    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:

    • contains(double, double, double, double)

  • getPathIterator

    Returns an iterator object that iterates along the

    Shape

    boundary and provides access to the geometry of the

    Shape

    outline. If an optional

    AffineTransform

    is specified, the coordinates returned in the iteration are transformed accordingly.

    Each call to this method returns a fresh PathIterator object that traverses the geometry of the Shape object independently from any other PathIterator objects in use at the same time.

    It is recommended, but not guaranteed, that objects implementing the Shape interface isolate iterations that are in process from any changes that might occur to the original object's geometry during such iterations.

    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:

    a new PathIterator object, which independently traverses the geometry of the Shape.

    Since:

    1.2

  • getPathIterator

    Returns an iterator object that iterates along the

    Shape

    boundary and provides access to a flattened view of the

    Shape

    outline geometry.

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

    If an optional AffineTransform is specified, the coordinates returned in the iteration are transformed accordingly.

    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. Note that a limit on the accuracy of the flattened path might be silently imposed, causing very small flattening parameters to be treated as larger values. This limit, if there is one, is defined by the particular implementation that is used.

    Each call to this method returns a fresh PathIterator object that traverses the Shape object geometry independently from any other PathIterator objects in use at the same time.

    It is recommended, but not guaranteed, that objects implementing the Shape interface isolate iterations that are in process from any changes that might occur to the original object's geometry during such iterations.

    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 new PathIterator that independently traverses a flattened view of the geometry of the Shape.

    Since:

    1.2

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