/*
* 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.jtstest.function;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.GeometryCollection;
import org.locationtech.jts.geom.GeometryCollectionIterator;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.LineString;
import org.locationtech.jts.geom.util.LinearComponentExtracter;
import org.locationtech.jts.noding.SegmentString;
import org.locationtech.jts.operation.buffer.BufferInputLineSimplifier;
import org.locationtech.jts.operation.buffer.BufferOp;
import org.locationtech.jts.operation.buffer.BufferParameters;
import org.locationtech.jts.operation.buffer.OffsetCurveSetBuilder;
import org.locationtech.jts.operation.buffer.validate.BufferResultValidator;
public class BufferByUnionFunctions {
public static Geometry componentBuffers(Geometry g, double distance)
{
List bufs = new ArrayList();
for (Iterator it = new GeometryCollectionIterator(g); it.hasNext(); ) {
Geometry comp = (Geometry) it.next();
if (comp instanceof GeometryCollection) continue;
bufs.add(comp.buffer(distance));
}
return FunctionsUtil.getFactoryOrDefault(g)
.createGeometryCollection(GeometryFactory.toGeometryArray(bufs));
}
public static Geometry bufferByComponents(Geometry g, double distance)
{
return componentBuffers(g, distance).union();
}
/**
* Buffer polygons by buffering the individual boundary segments and
* either unioning or differencing them.
*
* @param g
* @param distance
* @return the buffer geometry
*/
public static Geometry bufferBySegments(Geometry g, double distance)
{
Geometry segs = LineHandlingFunctions.extractSegments(g);
double posDist = Math.abs(distance);
Geometry segBuf = bufferByComponents(segs, posDist);
if (distance < 0.0)
return g.difference(segBuf);
return g.union(segBuf);
}
public static Geometry bufferByChains(Geometry g, double distance, int maxChainSize)
{
if (maxChainSize <= 0)
throw new IllegalArgumentException("Maximum Chain Size must be specified as an input parameter");
Geometry segs = LineHandlingFunctions.extractChains(g, maxChainSize);
double posDist = Math.abs(distance);
Geometry segBuf = bufferByComponents(segs, posDist);
if (distance < 0.0)
return g.difference(segBuf);
return g.union(segBuf);
}
}