Class FlatteningPathIterator

java.lang.Object

java.awt.geom.FlatteningPathIterator

All Implemented Interfaces:: PathIterator

public class FlatteningPathIterator extends Object implements PathIterator

The FlatteningPathIterator class returns a flattened view of another PathIterator object. Other Shape classes can use this class to provide flattening behavior for their paths without having to perform the interpolation calculations themselves.

Field Summary

Fields declared in interface PathIterator

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

Modifier and Type	Field	Description
`static final int`	`SEG_CLOSE`	The segment type constant that specifies that the preceding subpath should be closed by appending a line segment back to the point corresponding to the most recent SEG_MOVETO.
`static final int`	`SEG_CUBICTO`	The segment type constant for the set of 3 points that specify a cubic parametric curve to be drawn from the most recently specified point.
`static final int`	`SEG_LINETO`	The segment type constant for a point that specifies the end point of a line to be drawn from the most recently specified point.
`static final int`	`SEG_MOVETO`	The segment type constant for a point that specifies the starting location for a new subpath.
`static final int`	`SEG_QUADTO`	The segment type constant for the pair of points that specify a quadratic parametric curve to be drawn from the most recently specified point.
`static final int`	`WIND_EVEN_ODD`	The winding rule constant for specifying an even-odd rule for determining the interior of a path.
`static final int`	`WIND_NON_ZERO`	The winding rule constant for specifying a non-zero rule for determining the interior of a path.

Constructor Summary

Constructor	Description
`FlatteningPathIterator(PathIterator src, double flatness)`	Constructs a new `FlatteningPathIterator` object that flattens a path as it iterates over it.
`FlatteningPathIterator(PathIterator src, double flatness, int limit)`	Constructs a new `FlatteningPathIterator` object that flattens a path as it iterates over it.

Method Summary

Modifier and Type	Method	Description
`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.
`double`	`getFlatness()`	Returns the flatness of this iterator.
`int`	`getRecursionLimit()`	Returns the recursion limit of this iterator.
`int`	`getWindingRule()`	Returns the winding rule for determining the interior of the path.
`boolean`	`isDone()`	Tests if the iteration is complete.
`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 declared in class Object

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

Modifier and Type	Method	Description
`protected Object`	`clone()`	Creates and returns a copy of this object.
`boolean`	`equals(Object obj)`	Indicates whether some other object is "equal to" this one.
`protected void`	`finalize()`	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
`final Class<?>`	`getClass()`	Returns the runtime class of this `Object`.
`int`	`hashCode()`	Returns a hash code value for this object.
`final void`	`notify()`	Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()`	Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()`	Returns a string representation of the object.
`final void`	`wait()`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`	`wait(long timeoutMillis)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis, int nanos)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

Constructor Details

FlatteningPathIterator

public FlatteningPathIterator(PathIterator src, double flatness)

Constructs a new FlatteningPathIterator object that flattens a path as it iterates over it. The iterator does not subdivide any curve read from the source iterator to more than 10 levels of subdivision which yields a maximum of 1024 line segments per curve.

Parameters:: src - the original unflattened path being iterated over; flatness - the maximum allowable distance between the control points and the flattened curve

FlatteningPathIterator

public FlatteningPathIterator(PathIterator src, double flatness, int limit)

Constructs a new FlatteningPathIterator object that flattens a path as it iterates over it. The limit parameter allows you to control the maximum number of recursive subdivisions that the iterator can make before it assumes that the curve is flat enough without measuring against the flatness parameter. The flattened iteration therefore never generates more than a maximum of (2^limit) line segments per curve.

Parameters:: src - the original unflattened path being iterated over; flatness - the maximum allowable distance between the control points and the flattened curve; limit - the maximum number of recursive subdivisions allowed for any curved segment
Throws:: IllegalArgumentException - if flatness or limit is less than zero

Method Details

getFlatness

public double getFlatness()

Returns the flatness of this iterator.

Returns:: the flatness of this FlatteningPathIterator.

getRecursionLimit

public int getRecursionLimit()

Returns the recursion limit of this iterator.

Returns:: the recursion limit of this FlatteningPathIterator.

getWindingRule

public int getWindingRule()

Returns the winding rule for determining the interior of the path.

Specified by:

getWindingRule in interface PathIterator

Returns:

the winding rule of the original unflattened path being iterated over.

See Also:

isDone

public boolean isDone()

Tests if the iteration is complete.

Specified by:: isDone in interface PathIterator
Returns:: true if all the segments have been read; false otherwise.

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

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, or SEG_CLOSE. A float array of length 6 must be passed in and can 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 return one point, and SEG_CLOSE does 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.

Throws:

NoSuchElementException - if there are no more elements in the flattening path to be returned.

See Also:

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, or SEG_CLOSE. A double array of length 6 must be passed in and can 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 return one point, and SEG_CLOSE does 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.

Throws:

NoSuchElementException - if there are no more elements in the flattening path to be returned.

See Also:

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