org.geolatte.geom

Class MeasureInterpolatingVisitor<P extends C2D & Measured>

java.lang.Object

org.geolatte.geom.MeasureInterpolatingVisitor<P>

All Implemented Interfaces:

GeometryVisitor<P>

public class MeasureInterpolatingVisitor<P extends C2D & Measured>
extends java.lang.Object
implements GeometryVisitor<P>

A GeometryVisitor that derives a Geometry by interpolating on the measure values of the visited Geometries.

Interpolation is used to determine any points on the 1-dimensional geometry with an m coordinate value between SM and EM inclusively. The implementation-defined interpolation algorithm is used to estimate values between measured values, usually using a mathematical function. For example, given a measure of 6 and a 2-point linestring where the m coordinate value of the start point is 4 and the m coordinate value of the end point is 8, since 6 is halfway between 4 and 8, the interpolation algorithm would be a point on the linestring halfway between the start and end points.

Field Summary

Fields

Modifier and Type	Field and Description
private PositionSequenceBuilder<P>	currentBuilder
private double	endMeasure
private Geometry<P>	geometry
private static java.lang.String	INVALID_TYPE_MSG
private java.util.List<PositionSequence<P>>	positionSequences
private boolean	sequenceIsEmpty
private double	startMeasure

Constructor Summary

Constructors

Constructor and Description
MeasureInterpolatingVisitor(Geometry<P> geometry, double startMeasure, double endMeasure)

Method Summary

Modifier and Type	Method and Description
private P	addIfNotEqualLast(P lastPoint, P newPnt)
private CoordinateReferenceSystem<P>	getCrs()
private P	interpolate(P p0, P p1, double r)
Geometry<P>	result()
private void	startNewPointSequenceIfNotEmpty()
void	visit(GeometryCollection collection) Visits a GeometryCollection.
void	visit(LineString<P> lineString) Visits a LineString.
void	visit(Point<P> point) Visits a Point
void	visit(Polygon polygon) Visits a Polygon.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INVALID_TYPE_MSG

private static final java.lang.String INVALID_TYPE_MSG

See Also:

Constant Field Values

geometry

private final Geometry<P extends C2D & Measured> geometry

startMeasure

private final double startMeasure

endMeasure

private final double endMeasure

positionSequences

private final java.util.List<PositionSequence<P extends C2D & Measured>> positionSequences

currentBuilder

private PositionSequenceBuilder<P extends C2D & Measured> currentBuilder

sequenceIsEmpty

private boolean sequenceIsEmpty

Constructor Detail

MeasureInterpolatingVisitor

public MeasureInterpolatingVisitor(Geometry<P> geometry,
                                   double startMeasure,
                                   double endMeasure)

Method Detail

visit

public void visit(Point<P> point)

Description copied from interface: GeometryVisitor

Visits a Point

Specified by:

visit in interface GeometryVisitor<P extends C2D & Measured>

visit

public void visit(LineString<P> lineString)

Description copied from interface: GeometryVisitor

Visits a LineString.

Specified by:

visit in interface GeometryVisitor<P extends C2D & Measured>

startNewPointSequenceIfNotEmpty

private void startNewPointSequenceIfNotEmpty()

addIfNotEqualLast

private P addIfNotEqualLast(P lastPoint,
                            P newPnt)

interpolate

private P interpolate(P p0,
                      P p1,
                      double r)

visit

public void visit(Polygon polygon)

Description copied from interface: GeometryVisitor

Visits a Polygon.

Specified by:

visit in interface GeometryVisitor<P extends C2D & Measured>

visit

public void visit(GeometryCollection collection)

Description copied from interface: GeometryVisitor

Visits a GeometryCollection.

The collection will pass the visitor to it constituent parts.

Specified by:

visit in interface GeometryVisitor<P extends C2D & Measured>

result

public Geometry<P> result()

getCrs

private CoordinateReferenceSystem<P> getCrs()