java.awt.geom
Class FlatteningPathIterator
- 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 2n
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.
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
FlatteningPathIterator
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.
FlatteningPathIterator
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.
getFlatness
public double getFlatness()
Returns the maximally acceptable flatness.
getRecursionLimit
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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