public abstract class Ellipse2D extends RectangularShape
The Ellipse2D
class describes an ellipse that is defined by a framing rectangle.
This class is only the abstract superclass for all objects which store a 2D ellipse. The actual storage representation of the coordinates is left to the subclass.
Modifier and Type | Class and Description |
---|---|
static class |
Ellipse2D.Double The |
static class |
Ellipse2D.Float The |
protected Ellipse2D()
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.
Ellipse2D.Float
, Ellipse2D.Double
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.
x
- the specified X coordinate to be testedy
- the specified Y coordinate to be testedtrue
if the specified coordinates are inside the Shape
boundary; false
otherwise.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:
Shape
intersect, but 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.x
- the X coordinate of the upper-left corner of the specified rectangular areay
- the Y coordinate of the upper-left corner of the specified rectangular areaw
- the width of the specified rectangular areah
- the height of the specified rectangular areatrue
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.Area
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:
intersect
method returns true
and Shape
entirely contains the rectangular area are prohibitively expensive. 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.x
- the X coordinate of the upper-left corner of the specified rectangular areay
- the Y coordinate of the upper-left corner of the specified rectangular areaw
- the width of the specified rectangular areah
- the height of the specified rectangular areatrue
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.Area
, Shape.intersects(double, double, double, double)
public PathIterator getPathIterator(AffineTransform at)
Returns an iteration object that defines the boundary of this Ellipse2D
. The iterator for this class is multi-threaded safe, which means that this Ellipse2D
class guarantees that modifications to the geometry of this Ellipse2D
object do not affect any iterations of that geometry that are already in process.
at
- an optional AffineTransform
to be applied to the coordinates as they are returned in the iteration, or null
if untransformed coordinates are desiredPathIterator
object that returns the geometry of the outline of this Ellipse2D
, one segment at a time.public int hashCode()
Returns the hashcode for this Ellipse2D
.
hashCode
in class Object
Ellipse2D
.Object.equals(java.lang.Object)
, System.identityHashCode(java.lang.Object)
public boolean equals(Object obj)
Determines whether or not the specified Object
is equal to this Ellipse2D
. The specified Object
is equal to this Ellipse2D
if it is an instance of Ellipse2D
and if its location and size are the same as this Ellipse2D
.
equals
in class Object
obj
- an Object
to be compared with this Ellipse2D
.true
if obj
is an instance of Ellipse2D
and has the same values; false
otherwise.Object.hashCode()
, HashMap
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