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Ellipse2D.Double (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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java.awt.geom
Class Ellipse2D.Double

java.lang.Object
  extended by java.awt.geom.RectangularShape
      extended by java.awt.geom.Ellipse2D
          extended by java.awt.geom.Ellipse2D.Double
All Implemented Interfaces:
Shape, Serializable, Cloneable
Enclosing class:
Ellipse2D
public static class Ellipse2D.Double
extends Ellipse2D
implements Serializable

The Double class defines an ellipse specified in double precision.

Since:
1.2
See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class java.awt.geom.Ellipse2D
Ellipse2D.Double, Ellipse2D.Float
 
Field Summary
 double height
          The overall height of the Ellipse2D.
 double width
          The overall width of this Ellipse2D.
 double x
          The X coordinate of the upper-left corner of the framing rectangle of this Ellipse2D.
 double y
          The Y coordinate of the upper-left corner of the framing rectangle of this Ellipse2D.
 
Constructor Summary
Ellipse2D.Double()
          Constructs a new Ellipse2D, initialized to location (0, 0) and size (0, 0).
Ellipse2D.Double(double x, double y, double w, double h)
          Constructs and initializes an Ellipse2D from the specified coordinates.
 
Method Summary
 Rectangle2D getBounds2D()
          Returns a high precision and more accurate bounding box of the Shape than the getBounds method.
 double getHeight()
          Returns the height of the framing rectangle in double precision.
 double getWidth()
          Returns the width of the framing rectangle in double precision.
 double getX()
          Returns the X coordinate of the upper-left corner of the framing rectangle in double precision.
 double getY()
          Returns the Y coordinate of the upper-left corner of the framing rectangle in double precision.
 boolean isEmpty()
          Determines whether the RectangularShape is empty.
 void setFrame(double x, double y, double w, double h)
          Sets the location and size of the framing rectangle of this Shape to the specified rectangular values.
 
Methods inherited from class java.awt.geom.Ellipse2D
contains, contains, equals, getPathIterator, hashCode, intersects
 
Methods inherited from class java.awt.geom.RectangularShape
clone, contains, contains, getBounds, getCenterX, getCenterY, getFrame, getMaxX, getMaxY, getMinX, getMinY, getPathIterator, intersects, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

x

public double x
The X coordinate of the upper-left corner of the framing rectangle of this Ellipse2D.

Since:
1.2

y

public double y
The Y coordinate of the upper-left corner of the framing rectangle of this Ellipse2D.

Since:
1.2

width

public double width
The overall width of this Ellipse2D.

Since:
1.2

height

public double height
The overall height of the Ellipse2D.

Since:
1.2
Constructor Detail

Ellipse2D.Double

public Ellipse2D.Double()
Constructs a new Ellipse2D, initialized to location (0, 0) and size (0, 0).

Since:
1.2

Ellipse2D.Double

public Ellipse2D.Double(double x,
                        double y,
                        double w,
                        double h)
Constructs and initializes an Ellipse2D from the specified coordinates.

Parameters:
x - the X coordinate of the upper-left corner of the framing rectangle
y - the Y coordinate of the upper-left corner of the framing rectangle
w - the width of the framing rectangle
h - the height of the framing rectangle
Since:
1.2
Method Detail

getX

public double getX()
Returns the X coordinate of the upper-left corner of the framing rectangle in double precision.

Specified by:
getX in class RectangularShape
Returns:
the X coordinate of the upper-left corner of the framing rectangle.
Since:
1.2

getY

public double getY()
Returns the Y coordinate of the upper-left corner of the framing rectangle in double precision.

Specified by:
getY in class RectangularShape
Returns:
the Y coordinate of the upper-left corner of the framing rectangle.
Since:
1.2

getWidth

public double getWidth()
Returns the width of the framing rectangle in double precision.

Specified by:
getWidth in class RectangularShape
Returns:
the width of the framing rectangle.
Since:
1.2

getHeight

public double getHeight()
Returns the height of the framing rectangle in double precision.

Specified by:
getHeight in class RectangularShape
Returns:
the height of the framing rectangle.
Since:
1.2

isEmpty

public boolean isEmpty()
Determines whether the RectangularShape is empty. When the RectangularShape is empty, it encloses no area.

Specified by:
isEmpty in class RectangularShape
Returns:
true if the RectangularShape is empty; false otherwise.
Since:
1.2

setFrame

public void setFrame(double x,
                     double y,
                     double w,
                     double h)
Sets the location and size of the framing rectangle of this Shape to the specified rectangular values.

Specified by:
setFrame in class RectangularShape
Parameters:
x - the X coordinate of the upper-left corner of the specified rectangular shape
y - the Y coordinate of the upper-left corner of the specified rectangular shape
w - the width of the specified rectangular shape
h - the height of the specified rectangular shape
Since:
1.2
See Also:
RectangularShape.getFrame()

getBounds2D

public Rectangle2D getBounds2D()
Returns a high precision and more accurate bounding box of the 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.

Specified by:
getBounds2D in interface Shape
Returns:
an instance of Rectangle2D that is a high-precision bounding box of the Shape.
Since:
1.2
See Also:
Shape.getBounds()
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Java™ Platform
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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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