/*
* Copyright (c) 2016 Vivid Solutions.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
*
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.locationtech.jts.operation.distance;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.Geometry;
/**
* Represents the location of a point on a Geometry.
* Maintains both the actual point location
* (which may not be exact, if the point is not a vertex)
* as well as information about the component
* and segment index where the point occurs.
* Locations inside area Geometrys will not have an associated segment index,
* so in this case the segment index will have the sentinel value of
* {@link #INSIDE_AREA}.
*
* @version 1.7
*/
public class GeometryLocation
{
/**
* A special value of segmentIndex used for locations inside area geometries.
* These locations are not located on a segment,
* and thus do not have an associated segment index.
*/
public static final int INSIDE_AREA = -1;
private Geometry component = null;
private int segIndex;
private Coordinate pt = null;
/**
* Constructs a GeometryLocation specifying a point on a geometry, as well as the
* segment that the point is on
* (or {@link #INSIDE_AREA} if the point is not on a segment).
*
* @param component the component of the geometry containing the point
* @param segIndex the segment index of the location, or INSIDE_AREA
* @param pt the coordinate of the location
*/
public GeometryLocation(Geometry component, int segIndex, Coordinate pt)
{
this.component = component;
this.segIndex = segIndex;
this.pt = pt;
}
/**
* Constructs a GeometryLocation specifying a point inside an area geometry.
*
* @param component the component of the geometry containing the point
* @param pt the coordinate of the location
*/
public GeometryLocation(Geometry component,Coordinate pt)
{
this(component, INSIDE_AREA, pt);
}
/**
* Returns the geometry component on (or in) which this location occurs.
*/
public Geometry getGeometryComponent() { return component; }
/**
* Returns the segment index for this location. If the location is inside an
* area, the index will have the value {@link #INSIDE_AREA};
*
* @return the segment index for the location, or INSIDE_AREA
*/
public int getSegmentIndex() { return segIndex; }
/**
* Returns the {@link Coordinate} of this location.
*/
public Coordinate getCoordinate() { return pt; }
/**
* Tests whether this location represents a point inside an area geometry.
*/
public boolean isInsideArea() { return segIndex == INSIDE_AREA; }
}