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java.awt.geom
Class Ellipse2D
java.lang.Object
java.awt.geom.RectangularShape
java.awt.geom.Ellipse2D
-
All Implemented Interfaces:
-
Shape
,
Cloneable
-
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
bounding
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
|
static class |
Ellipse2D.Double
The Double class defines an ellipse specified in double precision. |
static class |
Ellipse2D.Float
The Float class defines an ellipse specified in float precision. |
Constructor Summary
|
protected |
Ellipse2D
()
This is an abstract class that cannot be instantiated directly. |
Method Summary
|
boolean |
contains
(double x, double y)
Tests if
the
a
specified
coordinates are
point is
inside the boundary of
the Shape.
this Ellipse2D.
|
boolean |
contains
(double x, double y, double w, double h)
Tests if the interior of
the Shape
this Ellipse2D
entirely contains the specified rectangular area. |
boolean |
equals
(
Object
obj)
Determines whether or not the specified Object is equal to this Ellipse2D. |
PathIterator
|
getPathIterator
(
AffineTransform
at)
Returns an iteration object that defines the boundary of this Ellipse2D. |
int |
hashCode
()
Returns the hashcode for this Ellipse2D. |
boolean |
intersects
(double x, double y, double w, double h)
Tests if the interior of
the Shape
this Ellipse2D
intersects the interior of a specified rectangular area. |
Methods inherited from 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
|
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
contains
public boolean contains(double x,
double y)
-
Tests if
the
a
specified
coordinates are
point is
inside the boundary of
the Shape.
this Ellipse2D.
-
-
Parameters:
-
x - the specified X coordinate to be tested
-
y - the specified Y coordinate to be tested
x, y - the coordinates to test
-
Returns:
-
true if the specified coordinates are inside the Shape boundary; false otherwise.
-
Since:
-
1.2
true if the specified point is contained in this ellipse; false otherwise.
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.
Tests if the interior of this Ellipse2D intersects the interior of a 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
x, y
- the
X coordinate
coordinates
of the
upper-left
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
rectangluar
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.
true if this Ellipse2D contains the specified rectangular area; 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 rectanglar area to be considered contained within the Shape.
Tests if the interior of this Ellipse2D entirely contains the specified rectangular area.
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
x, y
- the
X coordinate
coordinates
of the
upper-left
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.
true if this Ellipse2D contains the specified rectangular area; false otherwise.
-
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 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 Ellipse2D, one segment at a time.
-
Since:
-
1.2
hashCode
public int hashCode()
-
Returns the hashcode for this Ellipse2D.
-
-
Overrides:
-
hashCode
in class
Object
-
-
Returns:
-
the hashcode for this Ellipse2D.
-
Since:
-
1.6
-
See Also:
-
Object.equals(java.lang.Object)
,
Hashtable
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 class
Object
-
-
Parameters:
-
obj - an Object to be compared with this Ellipse2D.
-
Returns:
-
true if obj is an instance of Ellipse2D and has the same values; false otherwise.
-
Since:
-
1.6
-
See Also:
-
Object.hashCode()
,
Hashtable