Package org.geotools.geometry.jts
Class PolygonIterator
- Object
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- AbstractLiteIterator
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- PolygonIterator
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- All Implemented Interfaces:
PathIterator
public final class PolygonIterator extends AbstractLiteIterator
A path iterator for the LiteShape class, specialized to iterate over Polygon objects.- Author:
- Andrea Aime, simone giannecchini
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Field Summary
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Fields inherited from class AbstractLiteIterator
dcoords
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Fields inherited from interface PathIterator
SEG_CLOSE, SEG_CUBICTO, SEG_LINETO, SEG_MOVETO, SEG_QUADTO, WIND_EVEN_ODD, WIND_NON_ZERO
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Constructor Summary
Constructors Constructor Description PolygonIterator(Polygon p, AffineTransform at)
Creates a new PolygonIterator object.PolygonIterator(Polygon p, AffineTransform at, boolean generalize)
Creates a new PolygonIterator object.PolygonIterator(Polygon p, AffineTransform at, boolean generalize, double maxDistance)
Creates a new PolygonIterator object.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
currentSegment(double[] coords)
Returns the coordinates and type of the current path segment in the iteration.double
getMaxDistance()
Returns the distance limit for point skipping during distance based generalizationint
getWindingRule()
Return 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.void
setMaxDistance(double distance)
Sets the distance limit for point skipping during distance based generalizationprotected void
transform(double[] src, int index, double[] dest, int destIndex, int numPoints)
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Methods inherited from class AbstractLiteIterator
currentSegment
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Constructor Detail
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PolygonIterator
public PolygonIterator(Polygon p, AffineTransform at)
Creates a new PolygonIterator object.- Parameters:
p
- The polygonat
- The affine transform applied to coordinates during iteration
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PolygonIterator
public PolygonIterator(Polygon p, AffineTransform at, boolean generalize)
Creates a new PolygonIterator object.- Parameters:
p
- The polygonat
- The affine transform applied to coordinates during iterationgeneralize
- if true apply simple distance based generalization
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PolygonIterator
public PolygonIterator(Polygon p, AffineTransform at, boolean generalize, double maxDistance)
Creates a new PolygonIterator object.- Parameters:
p
- The polygonat
- The affine transform applied to coordinates during iterationgeneralize
- if true apply simple distance based generalizationmaxDistance
- during iteration, a point will be skipped if it's distance from the previous is less than maxDistance
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Method Detail
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setMaxDistance
public void setMaxDistance(double distance)
Sets the distance limit for point skipping during distance based generalization- Parameters:
distance
- the maximum distance for point skipping
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getMaxDistance
public double getMaxDistance()
Returns the distance limit for point skipping during distance based generalization- Returns:
- the maximum distance for distance based generalization
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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.- 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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transform
protected void transform(double[] src, int index, double[] dest, int destIndex, int numPoints)
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getWindingRule
public int getWindingRule()
Return the winding rule for determining the interior of the path.- Returns:
WIND_EVEN_ODD
by default.
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isDone
public boolean isDone()
Tests if the iteration is complete.- Returns:
true
if all the segments have been read;false
otherwise.
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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.
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