Class ReversePathIterator

  • All Implemented Interfaces:
    java.awt.geom.PathIterator

    public final class ReversePathIterator
    extends java.lang.Object
    implements java.awt.geom.PathIterator
    A path iterator which iterates over a path in the reverse direction. This is missing in the java.awt.geom package, although it's quite simple to implement. After initialization the original PathIterator is not used any longer.

    Version:
    $Revision: 1.3 $
    • Field Summary

      Fields 
      Modifier and Type Field Description
      private double[] coordinates
      The reversed coordinates.
      private int coordIndex
      The index into the coordinates during iteration.
      private int segmentIndex
      The index into the segment types during iteration.
      private int[] segmentTypes
      The reversed segment types.
      private int windingRule
      The winding rule.
      • 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

      Constructors 
      Constructor Description
      ReversePathIterator​(java.awt.geom.PathIterator original)
      Create an inverted path iterator from a standard one, keeping the winding rule.
      ReversePathIterator​(java.awt.geom.PathIterator original, int windingRule)
      Create an inverted path iterator from a standard one.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      private static int coordinatesForSegmentType​(int segtype)
      Get the number of coordinates needed for a segment type.
      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.
      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
    • Field Detail

      • windingRule

        private final int windingRule
        The winding rule.
      • coordinates

        private final double[] coordinates
        The reversed coordinates.
      • segmentTypes

        private final int[] segmentTypes
        The reversed segment types.
      • coordIndex

        private int coordIndex
        The index into the coordinates during iteration.
      • segmentIndex

        private int segmentIndex
        The index into the segment types during iteration.
    • Constructor Detail

      • ReversePathIterator

        public ReversePathIterator​(java.awt.geom.PathIterator original)
        Create an inverted path iterator from a standard one, keeping the winding rule.
        Parameters:
        original - original iterator
      • ReversePathIterator

        public ReversePathIterator​(java.awt.geom.PathIterator original,
                                   int windingRule)
        Create an inverted path iterator from a standard one.
        Parameters:
        original - original iterator
        windingRule - winding rule of newly created iterator
    • Method Detail

      • getWindingRule

        public int getWindingRule()
        Returns the winding rule for determining the interior of the path.
        Specified by:
        getWindingRule in interface java.awt.geom.PathIterator
        Returns:
        the winding rule.
        See Also:
        PathIterator.WIND_EVEN_ODD, PathIterator.WIND_NON_ZERO
      • coordinatesForSegmentType

        private static int coordinatesForSegmentType​(int segtype)
        Get the number of coordinates needed for a segment type.
        Parameters:
        segtype - segment type
        Returns:
        coordinates needed
      • 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 java.awt.geom.PathIterator
      • isDone

        public boolean isDone()
        Tests if the iteration is complete.
        Specified by:
        isDone in interface java.awt.geom.PathIterator
        Returns:
        true if all the segments have been read; false otherwise.
      • 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, SEG_QUADTO, SEG_CUBICTO, 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 returns one point, SEG_QUADTO returns two points, SEG_CUBICTO returns 3 points and SEG_CLOSE does not return any points.
        Specified by:
        currentSegment in interface java.awt.geom.PathIterator
        Parameters:
        coords - an array that holds the data returned from this method
        Returns:
        the path-segment type of the current path segment.
        See Also:
        PathIterator.SEG_MOVETO, PathIterator.SEG_LINETO, PathIterator.SEG_QUADTO, PathIterator.SEG_CUBICTO, PathIterator.SEG_CLOSE
      • 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, SEG_QUADTO, SEG_CUBICTO, 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 returns one point, SEG_QUADTO returns two points, SEG_CUBICTO returns 3 points and SEG_CLOSE does not return any points.
        Specified by:
        currentSegment in interface java.awt.geom.PathIterator
        Parameters:
        coords - an array that holds the data returned from this method
        Returns:
        the path-segment type of the current path segment.
        See Also:
        PathIterator.SEG_MOVETO, PathIterator.SEG_LINETO, PathIterator.SEG_QUADTO, PathIterator.SEG_CUBICTO, PathIterator.SEG_CLOSE