/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2001-2006 Vivid Solutions
* (C) 2001-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.geometry.iso.operation.relate;
/**
* A RelateNode is a Node that maintains a list of EdgeStubs for the edges that
* are incident on it.
*/
import org.geotools.geometry.iso.topograph2D.Coordinate;
import org.geotools.geometry.iso.topograph2D.EdgeEndStar;
import org.geotools.geometry.iso.topograph2D.IntersectionMatrix;
import org.geotools.geometry.iso.topograph2D.Node;
/**
* Represents a node in the topological graph used to compute spatial
* relationships.
*
*
*
* @source $URL$
*/
public class RelateNode extends Node {
public RelateNode(Coordinate coord, EdgeEndStar edges) {
super(coord, edges);
}
/**
* Update the IM with the contribution for this component. A component only
* contributes if it has a labelling for both parent geometries
*/
protected void computeIM(IntersectionMatrix im) {
im.setAtLeastIfValid(label.getLocation(0), label.getLocation(1), 0);
}
/**
* Update the IM with the contribution for the EdgeEnds incident on this
* node.
*/
void updateIMFromEdges(IntersectionMatrix im) {
((EdgeEndBundleStar) edges).updateIM(im);
}
}