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`java.lang.Object`

`java.awt.geom.FlatteningPathIterator`

**Implemented Interfaces:**- PathIterator

A PathIterator for approximating curved path segments by sequences
of straight lines. Instances of this class will only return
segments of type

`PathIterator.SEG_MOVETO`

, `PathIterator.SEG_LINETO`

, and `PathIterator.SEG_CLOSE`

.
The accuracy of the approximation is determined by two parameters:

- The
*flatness*is a threshold value for deciding when a curved segment is consided flat enough for being approximated by a single straight line. Flatness is defined as the maximal distance of a curve control point to the straight line that connects the curve start and end. A lower flatness threshold means a closer approximation. See`QuadCurve2D.getFlatness()`

and`CubicCurve2D.getFlatness()`

for drawings which illustrate the meaning of flatness. - The
*recursion limit*imposes an upper bound for how often a curved segment gets subdivided. A limit of*n*means that for each individual quadratic and cubic Bézier spline segment, at most 2^{n}`PathIterator.SEG_LINETO`

segments will be created.

**Memory Efficiency:** The memory consumption grows linearly
with the recursion limit. Neither the *flatness* parameter nor
the number of segments in the flattened path will affect the memory
consumption.

**Thread Safety:** Multiple threads can safely work on
separate instances of this class. However, multiple threads should
not concurrently access the same instance, as no synchronization is
performed.

**Since:**- 1.2

**See Also:**`Implementation Note`

### 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

`FlatteningPathIterator(PathIterator src, double flatness)`

- Constructs a new PathIterator for approximating an input PathIterator with straight lines.

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

- Constructs a new PathIterator for approximating an input PathIterator with straight lines.

## Method Summary

`int`

`currentSegment(double[] coords)`

`int`

`currentSegment(float[] coords)`

`double`

`getFlatness()`

- Returns the maximally acceptable flatness.

`int`

`getRecursionLimit()`

- Returns the maximum number of recursive curve subdivisions.

`int`

`boolean`

`isDone()`

`void`

`next()`

### Methods inherited from class java.lang.Object

`clone`

,`equals`

,`extends Object> getClass`

,`finalize`

,`hashCode`

,`notify`

,`notifyAll`

,`toString`

,`wait`

,`wait`

,`wait`

public FlatteningPathIterator(PathIterator src, double flatness)

Constructs a new PathIterator for approximating an input PathIterator with straight lines. The approximation works by recursive subdivisons, until the specified flatness threshold is not exceeded.There will not be more than 10 nested recursion steps, which means that a single

`SEG_QUADTO`

or`SEG_CUBICTO`

segment is approximated by at most 2^{10}= 1024 straight lines.

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

Constructs a new PathIterator for approximating an input PathIterator with straight lines. The approximation works by recursive subdivisons, until the specified flatness threshold is not exceeded. Additionally, the number of recursions is also bound by the specified recursion limit.

public int currentSegment(double[] coords)

Specified by:- currentSegment in interface PathIterator

public int currentSegment(float[] coords)

Specified by:- currentSegment in interface PathIterator

public int getRecursionLimit()

Returns the maximum number of recursive curve subdivisions.

FlatteningPathIterator.java -- Approximates curves by straight lines
Copyright (C) 2003 Free Software Foundation
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