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Arc2D.Double (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Standard Ed. 6
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java.awt.geom
Class Arc2D.Double

java.lang.Object
  extended by java.awt.geom.RectangularShape
      extended by java.awt.geom.Arc2D
          extended by java.awt.geom.Arc2D.Double
All Implemented Interfaces:
Shape, Serializable, Cloneable
Enclosing class:
Arc2D
public static class Arc2D.Double
extends Arc2D
implements Serializable

This class defines an arc specified in double precision.

Since:
1.2
See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class java.awt.geom.Arc2D
Arc2D.Double, Arc2D.Float
 
Field Summary
 double extent
          The angular extent of the arc in degrees.
 double height
          The overall height of the full ellipse of which this arc is a partial section (not considering the angular extents).
 double start
          The starting angle of the arc in degrees.
 double width
          The overall width of the full ellipse of which this arc is a partial section (not considering the angular extents).
 double x
          The X coordinate of the upper-left corner of the framing rectangle of the arc.
 double y
          The Y coordinate of the upper-left corner of the framing rectangle of the arc.
 
Fields inherited from class java.awt.geom.Arc2D
CHORD, OPEN, PIE
 
Constructor Summary
Arc2D.Double()
          Constructs a new OPEN arc, initialized to location (0, 0), size (0, 0), angular extents (start = 0, extent = 0).
Arc2D.Double(double x, double y, double w, double h, double start, double extent, int type)
          Constructs a new arc, initialized to the specified location, size, angular extents, and closure type.
Arc2D.Double(int type)
          Constructs a new arc, initialized to location (0, 0), size (0, 0), angular extents (start = 0, extent = 0), and the specified closure type.
Arc2D.Double(Rectangle2D ellipseBounds, double start, double extent, int type)
          Constructs a new arc, initialized to the specified location, size, angular extents, and closure type.
 
Method Summary
 double getAngleExtent()
          Returns the angular extent of the arc.
 double getAngleStart()
          Returns the starting angle of the arc.
 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.
protected  Rectangle2D makeBounds(double x, double y, double w, double h)
          Constructs a Rectangle2D of the appropriate precision to hold the parameters calculated to be the framing rectangle of this arc.
 void setAngleExtent(double angExt)
          Sets the angular extent of this arc to the specified double value.
 void setAngleStart(double angSt)
          Sets the starting angle of this arc to the specified double value.
 void setArc(double x, double y, double w, double h, double angSt, double angExt, int closure)
          Sets the location, size, angular extents, and closure type of this arc to the specified double values.
 
Methods inherited from class java.awt.geom.Arc2D
contains, contains, contains, containsAngle, equals, getArcType, getBounds2D, getEndPoint, getPathIterator, getStartPoint, hashCode, intersects, setAngles, setAngles, setAngleStart, setArc, setArc, setArc, setArcByCenter, setArcByTangent, setArcType, setFrame
 
Methods inherited from class java.awt.geom.RectangularShape
clone, 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 the arc.

Since:
1.2

y

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

Since:
1.2

width

public double width
The overall width of the full ellipse of which this arc is a partial section (not considering the angular extents).

Since:
1.2

height

public double height
The overall height of the full ellipse of which this arc is a partial section (not considering the angular extents).

Since:
1.2

start

public double start
The starting angle of the arc in degrees.

Since:
1.2

extent

public double extent
The angular extent of the arc in degrees.

Since:
1.2
Constructor Detail

Arc2D.Double

public Arc2D.Double()
Constructs a new OPEN arc, initialized to location (0, 0), size (0, 0), angular extents (start = 0, extent = 0).

Since:
1.2

Arc2D.Double

public Arc2D.Double(int type)
Constructs a new arc, initialized to location (0, 0), size (0, 0), angular extents (start = 0, extent = 0), and the specified closure type.

Parameters:
type - The closure type for the arc: Arc2D.OPEN, Arc2D.CHORD, or Arc2D.PIE.
Since:
1.2

Arc2D.Double

public Arc2D.Double(double x,
                    double y,
                    double w,
                    double h,
                    double start,
                    double extent,
                    int type)
Constructs a new arc, initialized to the specified location, size, angular extents, and closure type.

Parameters:
x - The X coordinate of the upper-left corner of the arc's framing rectangle.
y - The Y coordinate of the upper-left corner of the arc's framing rectangle.
w - The overall width of the full ellipse of which this arc is a partial section.
h - The overall height of the full ellipse of which this arc is a partial section.
start - The starting angle of the arc in degrees.
extent - The angular extent of the arc in degrees.
type - The closure type for the arc: Arc2D.OPEN, Arc2D.CHORD, or Arc2D.PIE.
Since:
1.2

Arc2D.Double

public Arc2D.Double(Rectangle2D ellipseBounds,
                    double start,
                    double extent,
                    int type)
Constructs a new arc, initialized to the specified location, size, angular extents, and closure type.

Parameters:
ellipseBounds - The framing rectangle that defines the outer boundary of the full ellipse of which this arc is a partial section.
start - The starting angle of the arc in degrees.
extent - The angular extent of the arc in degrees.
type - The closure type for the arc: Arc2D.OPEN, Arc2D.CHORD, or Arc2D.PIE.
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. Note that the arc partially inscribes the framing rectangle of this RectangularShape.

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. Note that the arc partially inscribes the framing rectangle of this RectangularShape.

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. Note that the arc partially inscribes the framing rectangle of this RectangularShape.

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. Note that the arc partially inscribes the framing rectangle of this RectangularShape.

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

getAngleStart

public double getAngleStart()
Returns the starting angle of the arc.

Specified by:
getAngleStart in class Arc2D
Returns:
A double value that represents the starting angle of the arc in degrees.
Since:
1.2
See Also:
Arc2D.setAngleStart(double)

getAngleExtent

public double getAngleExtent()
Returns the angular extent of the arc.

Specified by:
getAngleExtent in class Arc2D
Returns:
A double value that represents the angular extent of the arc in degrees.
Since:
1.2
See Also:
Arc2D.setAngleExtent(double)

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

setArc

public void setArc(double x,
                   double y,
                   double w,
                   double h,
                   double angSt,
                   double angExt,
                   int closure)
Sets the location, size, angular extents, and closure type of this arc to the specified double values.

Specified by:
setArc in class Arc2D
Parameters:
x - The X coordinate of the upper-left corner of the arc.
y - The Y coordinate of the upper-left corner of the arc.
w - The overall width of the full ellipse of which this arc is a partial section.
h - The overall height of the full ellipse of which this arc is a partial section.
angSt - The starting angle of the arc in degrees.
angExt - The angular extent of the arc in degrees.
closure - The closure type for the arc: Arc2D.OPEN, Arc2D.CHORD, or Arc2D.PIE.
Since:
1.2

setAngleStart

public void setAngleStart(double angSt)
Sets the starting angle of this arc to the specified double value.

Specified by:
setAngleStart in class Arc2D
Parameters:
angSt - The starting angle of the arc in degrees.
Since:
1.2
See Also:
Arc2D.getAngleStart()

setAngleExtent

public void setAngleExtent(double angExt)
Sets the angular extent of this arc to the specified double value.

Specified by:
setAngleExtent in class Arc2D
Parameters:
angExt - The angular extent of the arc in degrees.
Since:
1.2
See Also:
Arc2D.getAngleExtent()

makeBounds

protected Rectangle2D makeBounds(double x,
                                 double y,
                                 double w,
                                 double h)
Constructs a Rectangle2D of the appropriate precision to hold the parameters calculated to be the framing rectangle of this arc.

Specified by:
makeBounds in class Arc2D
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.
Returns:
a Rectangle2D that is the framing rectangle of this arc.
Since:
1.2
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