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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class Ellipse2D - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.awt.geom
Class Ellipse2D

java.lang.Object
  |
  +--java.awt.geom.RectangularShape
        |
        +--java.awt.geom.Ellipse2D

Direct Known Subclasses:

Ellipse2D.Double, Ellipse2D.Float

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public abstract class Ellipse2D

extends RectangularShape

The Ellipse2D class describes an ellipse that is defined by a 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.

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Inner 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 a specified point is inside the boundary of this Ellipse2D.
boolean	contains(double x, double y, double w, double h)           Tests if the interior of this Ellipse2D entirely contains the specified rectangular area.
PathIterator	getPathIterator(AffineTransform at)           Returns an iteration object that defines the boundary of this Ellipse2D.
boolean	intersects(double x, double y, double w, double h)           Tests if the interior of 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

 

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

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.

See Also:

Ellipse2D.Float, Ellipse2D.Double

Method Detail

contains

public boolean contains(double x,
                        double y)

Tests if a specified point is inside the boundary of this Ellipse2D.

Parameters:

x, y - the coordinates to test

Returns:

true if the specified point is contained in this ellipse; false otherwise.

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intersects

public boolean intersects(double x,
                          double y,
                          double w,
                          double h)

Tests if the interior of this Ellipse2D intersects the interior of a specified rectangular area.

Parameters:

x, y - the coordinates of the upper left corner of the specified rectangular area

w - the width of the specified rectangular area

h - the height of the specified rectangluar area

Returns:

true if this Ellipse2D contains the specified rectangular area; false otherwise.

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contains

public boolean contains(double x,
                        double y,
                        double w,
                        double h)

Tests if the interior of this Ellipse2D entirely contains the specified rectangular area.

Parameters:

x, y - the coordinates 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 this Ellipse2D contains the specified rectangular area; false otherwise.

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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.

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