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FlatteningPathIterator (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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JavaTM 2 Platform
Std. Ed. v1.4.1
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java.awt.geom
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 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 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
 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 inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

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 Detail

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:
PathIterator.WIND_EVEN_ODD, PathIterator.WIND_NON_ZERO

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.

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

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:
PathIterator.SEG_MOVETO, PathIterator.SEG_LINETO, 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, 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:
PathIterator.SEG_MOVETO, PathIterator.SEG_LINETO, PathIterator.SEG_CLOSE
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JavaTM 2 Platform
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.