Class Ellipse2D
- java.lang.Object
-
- java.awt.geom.RectangularShape
-
- java.awt.geom.Ellipse2D
- Direct Known Subclasses:
-
Ellipse2D.Double
,Ellipse2D.Float
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.
- Since:
- 1.2
Nested Class Summary
Modifier and Type | Class | Description |
---|---|---|
static class | Ellipse2D.Double | The |
static class | Ellipse2D.Float | The |
Constructor Summary
Modifier | Constructor | Description |
---|---|---|
protected | Ellipse2D() | 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 |
boolean | contains(double x,
double y,
double w,
double h) | Tests if the interior of the |
boolean | equals(Object obj) | Determines whether or not the specified |
PathIterator | getPathIterator(AffineTransform at) | Returns an iteration object that defines the boundary of this |
int | hashCode() | Returns the hashcode for this |
boolean | intersects(double x,
double y,
double w,
double h) | Tests if the interior of the |
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, 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 Detail
Ellipse2D
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.
- Since:
- 1.2
- See Also:
-
Ellipse2D.Float
,Ellipse2D.Double
Method Detail
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 theShape
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.
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 theShape
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 returnstrue
and - the calculations to determine whether or not the
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.- 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 theShape
entirely contains the specified rectangular area;false
otherwise or, if theShape
contains the rectangular area and theintersects
method returnstrue
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 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.
- Parameters:
-
at
- an optionalAffineTransform
to be applied to the coordinates as they are returned in the iteration, ornull
if untransformed coordinates are desired - Returns:
- the
PathIterator
object that returns the geometry of the outline of thisEllipse2D
, one segment at a time. - Since:
- 1.2
hashCode
public int hashCode()
Returns the hashcode for this Ellipse2D
.
- Overrides:
-
hashCode
in classObject
- Returns:
- the hashcode for this
Ellipse2D
. - 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 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
.
- Overrides:
-
equals
in classObject
- Parameters:
-
obj
- anObject
to be compared with thisEllipse2D
. - Returns:
-
true
ifobj
is an instance ofEllipse2D
and has the same values;false
otherwise. - Since:
- 1.6
- See Also:
-
Object.hashCode()
,HashMap