Class ReversePathIterator
- java.lang.Object
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- com.github.weisj.jsvg.geometry.util.ReversePathIterator
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- 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 $
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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.
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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.
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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.
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Field Detail
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windingRule
private final int windingRule
The winding rule.
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coordinates
private final double[] coordinates
The reversed coordinates.
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segmentTypes
private final int[] segmentTypes
The reversed segment types.
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coordIndex
private int coordIndex
The index into the coordinates during iteration.
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segmentIndex
private int segmentIndex
The index into the segment types during iteration.
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Constructor Detail
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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
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ReversePathIterator
public ReversePathIterator(java.awt.geom.PathIterator original, int windingRule)
Create an inverted path iterator from a standard one.- Parameters:
original
- original iteratorwindingRule
- winding rule of newly created iterator
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Method Detail
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getWindingRule
public int getWindingRule()
Returns the winding rule for determining the interior of the path.- Specified by:
getWindingRule
in interfacejava.awt.geom.PathIterator
- Returns:
- the winding rule.
- See Also:
PathIterator.WIND_EVEN_ODD
,PathIterator.WIND_NON_ZERO
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coordinatesForSegmentType
private static int coordinatesForSegmentType(int segtype)
Get the number of coordinates needed for a segment type.- Parameters:
segtype
- segment type- Returns:
- coordinates needed
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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 interfacejava.awt.geom.PathIterator
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isDone
public boolean isDone()
Tests if the iteration is complete.- Specified by:
isDone
in interfacejava.awt.geom.PathIterator
- Returns:
true
if all the segments have been read;false
otherwise.
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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 interfacejava.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
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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 interfacejava.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
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