java.awt.geom
Class ArcIterator

java.lang.Object
  java.awt.geom.ArcIterator

All Implemented Interfaces:

PathIterator

class ArcIterator

extends Object

implements PathIterator

A utility class to iterate over the path segments of an arc through the PathIterator interface.

Author:

Jim Graham

Field Summary

(package private) AffineTransform	affine
(package private) double	angExtDeg
(package private) double	angStRad
(package private) int	arcSegs
(package private) double	h
(package private) int	index
(package private) int	lineSegs
(package private) double	w
(package private) double	x
(package private) double	y

Fields inherited from interface java.awt.geom.PathIterator

SEG_CLOSE, SEG_CUBICTO, SEG_LINETO, SEG_MOVETO, SEG_QUADTO, WIND_EVEN_ODD, WIND_NON_ZERO

Constructor Summary

(package private)

ArcIterator(Arc2D a, AffineTransform at)

Method Summary

private static double	btan(double increment)
int	currentSegment(double[] coords) Returns the coordinates and type of the current path segment in the iteration.
int	currentSegment(float[] coords) Returns the coordinates and type of the current path segment in the iteration.
int	getWindingRule() Return the winding rule for determining the insideness of the path.
boolean	isDone() Tests if there are more points to read.
void	next() Moves the iterator to the next segment of the path forwards along the primary direction of traversal as long as there are more points in that direction.

Methods inherited from class java.lang.Object

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

Field Detail

x

double x

y

double y

w

double w

h

double h

angStRad

double angStRad

angExtDeg

double angExtDeg

affine

AffineTransform affine

index

int index

arcSegs

int arcSegs

lineSegs

int lineSegs

Constructor Detail

ArcIterator

ArcIterator(Arc2D a,
            AffineTransform at)

Method Detail

getWindingRule

public int getWindingRule()

Return the winding rule for determining the insideness of the path.

Specified by:

getWindingRule in interface PathIterator

Returns:

the winding rule.

See Also:

PathIterator.WIND_EVEN_ODD, PathIterator.WIND_NON_ZERO

isDone

public boolean isDone()

Tests if there are more points to read.

Specified by:

isDone in interface PathIterator

Returns:

true if there are more points to read

next

public void next()

Moves the iterator to the next segment of the path forwards along the primary direction of traversal as long as there are more points in that direction.

Specified by:

next in interface PathIterator

btan

private static double btan(double increment)

currentSegment

public int currentSegment(float[] coords)

Returns the coordinates and type of the current path segment in the iteration. The return value is the path segment type: SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE. A float array of length 6 must be passed in and may be used to store the coordinates of the point(s). Each point is stored as a pair of float x,y coordinates. SEG_MOVETO and SEG_LINETO types will return one point, SEG_QUADTO will return two points, SEG_CUBICTO will return 3 points and SEG_CLOSE will not return any points.

Specified by:

currentSegment in interface PathIterator

Parameters:

coords - an array that holds the data returned from this method

Returns:

the path-segment type of the current path segment.

See Also:

PathIterator.SEG_MOVETO, PathIterator.SEG_LINETO, PathIterator.SEG_QUADTO, PathIterator.SEG_CUBICTO, PathIterator.SEG_CLOSE

currentSegment

public int currentSegment(double[] coords)

Returns the coordinates and type of the current path segment in the iteration. The return value is the path segment type: SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE. A double array of length 6 must be passed in and may be used to store the coordinates of the point(s). Each point is stored as a pair of double x,y coordinates. SEG_MOVETO and SEG_LINETO types will return one point, SEG_QUADTO will return two points, SEG_CUBICTO will return 3 points and SEG_CLOSE will not return any points.

Specified by:

currentSegment in interface PathIterator

Parameters:

coords - an array that holds the data returned from this method

Returns:

the path-segment type of the current path segment.

See Also:

PathIterator.SEG_MOVETO, PathIterator.SEG_LINETO, PathIterator.SEG_QUADTO, PathIterator.SEG_CUBICTO, PathIterator.SEG_CLOSE