 Direct Known Subclasses:
Arc2D.Double
,Arc2D.Float
public abstract class Arc2D extends RectangularShape
Arc2D
is the abstract superclass for all objects that
store a 2D arc defined by a framing rectangle,
start angle, angular extent (length of the arc), and a closure type
(OPEN
, CHORD
, or PIE
).
The arc is a partial section of a full ellipse which
inscribes the framing rectangle of its parent RectangularShape
.
The angles are specified relative to the nonsquare
framing rectangle such that 45 degrees always falls on the line from
the center of the ellipse to the upper right corner of the framing
rectangle.
As a result, if the framing rectangle is noticeably longer along one
axis than the other, the angles to the start and end of the arc segment
will be skewed farther along the longer axis of the frame.
The actual storage representation of the coordinates is left to the subclass.
 Since:
 1.2

Nested Class Summary
Nested Classes Modifier and Type Class Description static class
Arc2D.Double
This class defines an arc specified indouble
precision.static class
Arc2D.Float
This class defines an arc specified infloat
precision. 
Field Summary
Fields Modifier and Type Field Description static int
CHORD
The closure type for an arc closed by drawing a straight line segment from the start of the arc segment to the end of the arc segment.static int
OPEN
The closure type for an open arc with no path segments connecting the two ends of the arc segment.static int
PIE
The closure type for an arc closed by drawing straight line segments from the start of the arc segment to the center of the full ellipse and from that point to the end of the arc segment. 
Constructor Summary

Method Summary
Modifier and Type Method Description boolean
contains(double x, double y)
Determines whether or not the specified point is inside the boundary of the arc.boolean
contains(double x, double y, double w, double h)
Determines whether or not the interior of the arc entirely contains the specified rectangle.boolean
contains(Rectangle2D r)
Determines whether or not the interior of the arc entirely contains the specified rectangle.boolean
containsAngle(double angle)
Determines whether or not the specified angle is within the angular extents of the arc.boolean
equals(Object obj)
Determines whether or not the specifiedObject
is equal to thisArc2D
.abstract double
getAngleExtent()
Returns the angular extent of the arc.abstract double
getAngleStart()
Returns the starting angle of the arc.int
getArcType()
Rectangle2D
getBounds2D()
Returns the highprecision framing rectangle of the arc.Point2D
getEndPoint()
Returns the ending point of the arc.PathIterator
getPathIterator(AffineTransform at)
Returns an iteration object that defines the boundary of the arc.Point2D
getStartPoint()
Returns the starting point of the arc.int
hashCode()
Returns the hashcode for thisArc2D
.boolean
intersects(double x, double y, double w, double h)
Determines whether or not the interior of the arc intersects the interior of the specified rectangle.protected abstract Rectangle2D
makeBounds(double x, double y, double w, double h)
Constructs aRectangle2D
of the appropriate precision to hold the parameters calculated to be the framing rectangle of this arc.abstract void
setAngleExtent(double angExt)
Sets the angular extent of this arc to the specified double value.void
setAngles(double x1, double y1, double x2, double y2)
Sets the starting angle and angular extent of this arc using two sets of coordinates.void
setAngles(Point2D p1, Point2D p2)
Sets the starting angle and angular extent of this arc using two points.abstract void
setAngleStart(double angSt)
Sets the starting angle of this arc to the specified double value.void
setAngleStart(Point2D p)
Sets the starting angle of this arc to the angle that the specified point defines relative to the center of this arc.abstract 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.void
setArc(Arc2D a)
Sets this arc to be the same as the specified arc.void
setArc(Point2D loc, Dimension2D size, double angSt, double angExt, int closure)
Sets the location, size, angular extents, and closure type of this arc to the specified values.void
setArc(Rectangle2D rect, double angSt, double angExt, int closure)
Sets the location, size, angular extents, and closure type of this arc to the specified values.void
setArcByCenter(double x, double y, double radius, double angSt, double angExt, int closure)
Sets the position, bounds, angular extents, and closure type of this arc to the specified values.void
setArcByTangent(Point2D p1, Point2D p2, Point2D p3, double radius)
Sets the position, bounds, and angular extents of this arc to the specified value.void
setArcType(int type)
Sets the closure type of this arc to the specified value:OPEN
,CHORD
, orPIE
.void
setFrame(double x, double y, double w, double h)
Sets the location and size of the framing rectangle of thisShape
to the specified rectangular values.Methods declared in class java.awt.geom.RectangularShape
clone, contains, getBounds, getCenterX, getCenterY, getFrame, getHeight, getMaxX, getMaxY, getMinX, getMinY, getPathIterator, getWidth, getX, getY, intersects, isEmpty, setFrame, setFrame, setFrameFromCenter, setFrameFromCenter, setFrameFromDiagonal, setFrameFromDiagonal

Field Details

OPEN
public static final int OPENThe closure type for an open arc with no path segments connecting the two ends of the arc segment. Since:
 1.2
 See Also:
 Constant Field Values

CHORD
public static final int CHORDThe closure type for an arc closed by drawing a straight line segment from the start of the arc segment to the end of the arc segment. Since:
 1.2
 See Also:
 Constant Field Values

PIE
public static final int PIEThe closure type for an arc closed by drawing straight line segments from the start of the arc segment to the center of the full ellipse and from that point to the end of the arc segment. Since:
 1.2
 See Also:
 Constant Field Values


Constructor Details

Arc2D
protected Arc2D()This is an abstract class that cannot be instantiated directly. Typespecific implementation subclasses are available for instantiation and provide a number of formats for storing the information necessary to satisfy the various accessor methods below.This constructor creates an object with a default closure type of
OPEN
. It is provided only to enable serialization of subclasses. See Also:
Arc2D.Float
,Arc2D.Double

Arc2D
protected Arc2D(int type)This is an abstract class that cannot be instantiated directly. Typespecific implementation subclasses are available for instantiation and provide a number of formats for storing the information necessary to satisfy the various accessor methods below. Parameters:
type
 The closure type of this arc:OPEN
,CHORD
, orPIE
. Since:
 1.2
 See Also:
Arc2D.Float
,Arc2D.Double


Method Details

getAngleStart
public abstract double getAngleStart()Returns the starting angle of the arc. Returns:
 A double value that represents the starting angle of the arc in degrees.
 Since:
 1.2
 See Also:
setAngleStart(double)

getAngleExtent
public abstract double getAngleExtent()Returns the angular extent of the arc. Returns:
 A double value that represents the angular extent of the arc in degrees.
 Since:
 1.2
 See Also:
setAngleExtent(double)

getArcType
public int getArcType() Returns:
 One of the integer constant closure types defined in this class.
 Since:
 1.2
 See Also:
setArcType(int)

getStartPoint
Returns the starting point of the arc. This point is the intersection of the ray from the center defined by the starting angle and the elliptical boundary of the arc. Returns:
 A
Point2D
object representing the x,y coordinates of the starting point of the arc.  Since:
 1.2

getEndPoint
Returns the ending point of the arc. This point is the intersection of the ray from the center defined by the starting angle plus the angular extent of the arc and the elliptical boundary of the arc. Returns:
 A
Point2D
object representing the x,y coordinates of the ending point of the arc.  Since:
 1.2

setArc
public abstract 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. Parameters:
x
 The X coordinate of the upperleft corner of the arc.y
 The Y coordinate of the upperleft 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:OPEN
,CHORD
, orPIE
. Since:
 1.2

setArc
Sets the location, size, angular extents, and closure type of this arc to the specified values. Parameters:
loc
 ThePoint2D
representing the coordinates of the upperleft corner of the arc.size
 TheDimension2D
representing the width and 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:OPEN
,CHORD
, orPIE
. Since:
 1.2

setArc
Sets the location, size, angular extents, and closure type of this arc to the specified values. Parameters:
rect
 The framing rectangle that defines the outer boundary 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:OPEN
,CHORD
, orPIE
. Since:
 1.2

setArc
Sets this arc to be the same as the specified arc. Parameters:
a
 TheArc2D
to use to set the arc's values. Since:
 1.2

setArcByCenter
public void setArcByCenter(double x, double y, double radius, double angSt, double angExt, int closure)Sets the position, bounds, angular extents, and closure type of this arc to the specified values. The arc is defined by a center point and a radius rather than a framing rectangle for the full ellipse. Parameters:
x
 The X coordinate of the center of the arc.y
 The Y coordinate of the center of the arc.radius
 The radius of the arc.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:OPEN
,CHORD
, orPIE
. Since:
 1.2

setArcByTangent
Sets the position, bounds, and angular extents of this arc to the specified value. The starting angle of the arc is tangent to the line specified by points (p1, p2), the ending angle is tangent to the line specified by points (p2, p3), and the arc has the specified radius. Parameters:
p1
 The first point that defines the arc. The starting angle of the arc is tangent to the line specified by points (p1, p2).p2
 The second point that defines the arc. The starting angle of the arc is tangent to the line specified by points (p1, p2). The ending angle of the arc is tangent to the line specified by points (p2, p3).p3
 The third point that defines the arc. The ending angle of the arc is tangent to the line specified by points (p2, p3).radius
 The radius of the arc. Since:
 1.2

setAngleStart
public abstract void setAngleStart(double angSt)Sets the starting angle of this arc to the specified double value. Parameters:
angSt
 The starting angle of the arc in degrees. Since:
 1.2
 See Also:
getAngleStart()

setAngleExtent
public abstract void setAngleExtent(double angExt)Sets the angular extent of this arc to the specified double value. Parameters:
angExt
 The angular extent of the arc in degrees. Since:
 1.2
 See Also:
getAngleExtent()

setAngleStart
Sets the starting angle of this arc to the angle that the specified point defines relative to the center of this arc. The angular extent of the arc will remain the same. Parameters:
p
 ThePoint2D
that defines the starting angle. Since:
 1.2
 See Also:
getAngleStart()

setAngles
public void setAngles(double x1, double y1, double x2, double y2)Sets the starting angle and angular extent of this arc using two sets of coordinates. The first set of coordinates is used to determine the angle of the starting point relative to the arc's center. The second set of coordinates is used to determine the angle of the end point relative to the arc's center. The arc will always be nonempty and extend counterclockwise from the first point around to the second point. Parameters:
x1
 The X coordinate of the arc's starting point.y1
 The Y coordinate of the arc's starting point.x2
 The X coordinate of the arc's ending point.y2
 The Y coordinate of the arc's ending point. Since:
 1.2

setAngles
Sets the starting angle and angular extent of this arc using two points. The first point is used to determine the angle of the starting point relative to the arc's center. The second point is used to determine the angle of the end point relative to the arc's center. The arc will always be nonempty and extend counterclockwise from the first point around to the second point. Parameters:
p1
 ThePoint2D
that defines the arc's starting point.p2
 ThePoint2D
that defines the arc's ending point. Since:
 1.2

setArcType
public void setArcType(int type)Sets the closure type of this arc to the specified value:OPEN
,CHORD
, orPIE
. Parameters:
type
 The integer constant that represents the closure type of this arc:OPEN
,CHORD
, orPIE
. Throws:
IllegalArgumentException
 iftype
is not 0, 1, or 2.+ Since:
 1.2
 See Also:
getArcType()

setFrame
public void setFrame(double x, double y, double w, double h)Sets the location and size of the framing rectangle of thisShape
to the specified rectangular values. Note that the arc partially inscribes the framing rectangle of thisRectangularShape
. Specified by:
setFrame
in classRectangularShape
 Parameters:
x
 the X coordinate of the upperleft corner of the specified rectangular shapey
 the Y coordinate of the upperleft corner of the specified rectangular shapew
 the width of the specified rectangular shapeh
 the height of the specified rectangular shape Since:
 1.2
 See Also:
RectangularShape.getFrame()

getBounds2D
Returns the highprecision framing rectangle of the arc. The framing rectangle contains only the part of thisArc2D
that is in between the starting and ending angles and contains the pie wedge, if thisArc2D
has aPIE
closure type.This method differs from the
getBounds
in that thegetBounds
method only returns the bounds of the enclosing ellipse of thisArc2D
without considering the starting and ending angles of thisArc2D
. Returns:
 the
Rectangle2D
that represents the arc's framing rectangle.  Since:
 1.2
 See Also:
Shape.getBounds()

makeBounds
Constructs aRectangle2D
of the appropriate precision to hold the parameters calculated to be the framing rectangle of this arc. Parameters:
x
 The X coordinate of the upperleft corner of the framing rectangle.y
 The Y coordinate of the upperleft 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

containsAngle
public boolean containsAngle(double angle)Determines whether or not the specified angle is within the angular extents of the arc. Parameters:
angle
 The angle to test. Returns:
true
if the arc contains the angle,false
if the arc doesn't contain the angle. Since:
 1.2

contains
public boolean contains(double x, double y)Determines whether or not the specified point is inside the boundary of the arc. Parameters:
x
 The X coordinate of the point to test.y
 The Y coordinate of the point to test. Returns:
true
if the point lies within the bound of the arc,false
if the point lies outside of the arc's bounds. Since:
 1.2

intersects
public boolean intersects(double x, double y, double w, double h)Determines whether or not the interior of the arc intersects the interior of the specified rectangle. Parameters:
x
 The X coordinate of the rectangle's upperleft corner.y
 The Y coordinate of the rectangle's upperleft corner.w
 The width of the rectangle.h
 The height of the rectangle. Returns:
true
if the arc intersects the rectangle,false
if the arc doesn't intersect the rectangle. Since:
 1.2
 See Also:
Area

contains
public boolean contains(double x, double y, double w, double h)Determines whether or not the interior of the arc entirely contains the specified rectangle. Parameters:
x
 The X coordinate of the rectangle's upperleft corner.y
 The Y coordinate of the rectangle's upperleft corner.w
 The width of the rectangle.h
 The height of the rectangle. Returns:
true
if the arc contains the rectangle,false
if the arc doesn't contain the rectangle. Since:
 1.2
 See Also:
Area
,Shape.intersects(double, double, double, double)

contains
Determines whether or not the interior of the arc entirely contains the specified rectangle. Specified by:
contains
in interfaceShape
 Overrides:
contains
in classRectangularShape
 Parameters:
r
 TheRectangle2D
to test. Returns:
true
if the arc contains the rectangle,false
if the arc doesn't contain the rectangle. Since:
 1.2
 See Also:
Shape.contains(double, double, double, double)

getPathIterator
Returns an iteration object that defines the boundary of the arc. This iterator is multithread safe.Arc2D
guarantees that modifications to the geometry of the arc 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, or null if the untransformed coordinates are desired. Returns:
 A
PathIterator
that defines the arc's boundary.  Since:
 1.2

hashCode
public int hashCode()Returns the hashcode for thisArc2D
. Overrides:
hashCode
in classObject
 Returns:
 the hashcode for this
Arc2D
.  Since:
 1.6
 See Also:
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)

equals
Determines whether or not the specifiedObject
is equal to thisArc2D
. The specifiedObject
is equal to thisArc2D
if it is an instance ofArc2D
and if its location, size, arc extents and type are the same as thisArc2D
. Overrides:
equals
in classObject
 Parameters:
obj
 anObject
to be compared with thisArc2D
. Returns:
true
ifobj
is an instance ofArc2D
and has the same values;false
otherwise. Since:
 1.6
 See Also:
Object.hashCode()
,HashMap
