com.vividsolutions.jts.noding.InteriorIntersectionFinderAdder Maven / Gradle / Ivy
/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* 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; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.noding;
import java.util.*;
import com.vividsolutions.jts.geom.*;
import com.vividsolutions.jts.algorithm.LineIntersector;
import com.vividsolutions.jts.util.Debug;
/**
* Finds interior intersections between line segments in {@link NodedSegmentString}s,
* and adds them as nodes
* using {@link NodedSegmentString#addIntersection(LineIntersector, int, int, int)}.
*
* This class is used primarily for Snap-Rounding.
* For general-purpose noding, use {@link IntersectionAdder}.
*
* @version 1.7
* @see IntersectionAdder
*/
public class InteriorIntersectionFinderAdder
implements SegmentIntersector
{
private LineIntersector li;
private final List interiorIntersections;
/**
* Creates an intersection finder which finds all proper intersections
*
* @param li the LineIntersector to use
*/
public InteriorIntersectionFinderAdder(LineIntersector li)
{
this.li = li;
interiorIntersections = new ArrayList();
}
public List getInteriorIntersections() { return interiorIntersections; }
/**
* This method is called by clients
* of the {@link SegmentIntersector} class to process
* intersections for two segments of the {@link SegmentString}s being intersected.
* Note that some clients (such as MonotoneChains) may optimize away
* this call for segment pairs which they have determined do not intersect
* (e.g. by an disjoint envelope test).
*/
public void processIntersections(
SegmentString e0, int segIndex0,
SegmentString e1, int segIndex1
)
{
// don't bother intersecting a segment with itself
if (e0 == e1 && segIndex0 == segIndex1) return;
Coordinate p00 = e0.getCoordinates()[segIndex0];
Coordinate p01 = e0.getCoordinates()[segIndex0 + 1];
Coordinate p10 = e1.getCoordinates()[segIndex1];
Coordinate p11 = e1.getCoordinates()[segIndex1 + 1];
li.computeIntersection(p00, p01, p10, p11);
//if (li.hasIntersection() && li.isProper()) Debug.println(li);
if (li.hasIntersection()) {
if (li.isInteriorIntersection()) {
for (int intIndex = 0; intIndex < li.getIntersectionNum(); intIndex++) {
interiorIntersections.add(li.getIntersection(intIndex));
}
((NodedSegmentString) e0).addIntersections(li, segIndex0, 0);
((NodedSegmentString) e1).addIntersections(li, segIndex1, 1);
}
}
}
/**
* Always process all intersections
*
* @return false always
*/
public boolean isDone() { return false; }
}