Shape interface provides definitions for objects
that represent some form of geometric shape. The Shape
is described by a PathIterator
object, which can express the
outline of the Shape as well as a rule for determining
how the outline divides the 2D plane into interior and exterior
points. Each Shape 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 Shape, and retrieve a PathIterator
object that describes the trajectory path of the Shape
outline.
Definition of insideness:
A point is considered to lie inside a
Shape if and only if:
Shape boundary or
Shape boundary and the
space immediately adjacent to the
point in the increasing X direction is
entirely inside the boundary or
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.
Shape.Shape entirely contains
the specified rectangular area. All coordinates that lie inside
the rectangular area must lie within the Shape for the
entire rectanglar area to be considered contained within the
Shape.
This method might conservatively return false when:
intersect method returns true and
Shape entirely contains the rectangular area are
prohibitively expensive.
false even
though the Shape contains the rectangular area.
The Area class can be used to perform more accurate
computations of geometric intersection for any Shape
object if a more precise answer is required.Shape.Shape entirely contains the
specified Rectangle2D.
This method might conservatively return false when:
intersect method returns true and
Shape entirely contains the Rectangle2D
are prohibitively expensive.
false even
though the Shape contains the
Rectangle2D.
The Area class can be used to perform more accurate
computations of geometric intersection for any Shape
object if a more precise answer is required.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.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.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.
Before using a particular implementation of the Shape
interface in more than one thread simultaneously, refer to its
documentation to verify that it guarantees that iterations are isolated
from modifications.
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.
Before using a particular implementation of this interface in more than one thread simultaneously, refer to its documentation to verify that it guarantees that iterations are isolated from modifications.
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.
This method might conservatively return true when:
Shape intersect, but
true even
though the rectangular area does not intersect the Shape.
The Area
class can be used to perform
more accurate computations of geometric intersection for any
Shape object if a more precise answer is required.Shape intersects the
interior of a specified Rectangle2D.
This method might conservatively return true when:
Rectangle2D and the
Shape intersect, but
true even
though the Rectangle2D does not intersect the
Shape.