com.hazelcast.shaded.org.locationtech.jts.simplify.LineSegmentIndex Maven / Gradle / Ivy
/*
* 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 2.0
* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v20.html
* and the Eclipse Distribution License is available at
*
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package com.hazelcast.shaded.org.locationtech.jts.simplify;
import java.util.ArrayList;
import java.util.List;
import com.hazelcast.shaded.org.locationtech.jts.geom.Envelope;
import com.hazelcast.shaded.org.locationtech.jts.geom.LineSegment;
import com.hazelcast.shaded.org.locationtech.jts.index.ItemVisitor;
import com.hazelcast.shaded.org.locationtech.jts.index.quadtree.Quadtree;
/**
* An spatial index on a set of {@link LineSegment}s.
* Supports adding and removing items.
*
* @author Martin Davis
*/
class LineSegmentIndex
{
private Quadtree index = new Quadtree();
public LineSegmentIndex()
{
}
public void add(TaggedLineString line) {
TaggedLineSegment[] segs = line.getSegments();
for (int i = 0; i < segs.length; i++) {
TaggedLineSegment seg = segs[i];
add(seg);
}
}
public void add(LineSegment seg)
{
index.insert(new Envelope(seg.p0, seg.p1), seg);
}
public void remove(LineSegment seg)
{
index.remove(new Envelope(seg.p0, seg.p1), seg);
}
public List query(LineSegment querySeg)
{
Envelope env = new Envelope(querySeg.p0, querySeg.p1);
LineSegmentVisitor visitor = new LineSegmentVisitor(querySeg);
index.query(env, visitor);
List itemsFound = visitor.getItems();
// List listQueryItems = index.query(env);
// System.out.println("visitor size = " + itemsFound.size()
// + " query size = " + listQueryItems.size());
// List itemsFound = index.query(env);
return itemsFound;
}
}
/**
* ItemVisitor subclass to reduce volume of query results.
*/
class LineSegmentVisitor
implements ItemVisitor
{
// MD - only seems to make about a 10% difference in overall time.
private LineSegment querySeg;
private ArrayList items = new ArrayList();
public LineSegmentVisitor(LineSegment querySeg) {
this.querySeg = querySeg;
}
public void visitItem(Object item)
{
LineSegment seg = (LineSegment) item;
if (Envelope.intersects(seg.p0, seg.p1, querySeg.p0, querySeg.p1))
items.add(item);
}
public ArrayList getItems() { return items; }
}
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