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

    Constructors
    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()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • 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.

    • 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:

    • 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: