/*
* 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.*;
import org.locationtech.jts.algorithm.*;
import org.locationtech.jts.densify.*;
import org.locationtech.jts.dissolve.LineDissolver;
import org.locationtech.jts.geom.*;
import org.locationtech.jts.geom.util.*;
import org.locationtech.jts.operation.linemerge.*;
import org.locationtech.jts.operation.polygonize.*;
public class LineHandlingFunctions {
public static Geometry mergeLines(Geometry g)
{
LineMerger merger = new LineMerger();
merger.add(g);
Collection lines = merger.getMergedLineStrings();
return g.getFactory().buildGeometry(lines);
}
public static Geometry sequenceLines(Geometry g)
{
return LineSequencer.sequence(g);
}
public static Geometry extractLines(Geometry g)
{
List lines = LinearComponentExtracter.getLines(g);
return g.getFactory().buildGeometry(lines);
}
public static Geometry extractSegments(Geometry g)
{
List lines = LinearComponentExtracter.getLines(g);
List segments = new ArrayList();
for (Iterator it = lines.iterator(); it.hasNext(); ) {
LineString line = (LineString) it.next();
for (int i = 1; i < line.getNumPoints(); i++) {
LineString seg = g.getFactory().createLineString(
new Coordinate[] { line.getCoordinateN(i-1), line.getCoordinateN(i) }
);
segments.add(seg);
}
}
return g.getFactory().buildGeometry(segments);
}
public static Geometry extractChains(Geometry g, int maxChainSize)
{
List lines = LinearComponentExtracter.getLines(g);
List chains = new ArrayList();
for (Iterator it = lines.iterator(); it.hasNext(); ) {
LineString line = (LineString) it.next();
for (int i = 0; i < line.getNumPoints() - 1; i += maxChainSize) {
LineString chain = extractChain(line, i, maxChainSize);
chains.add(chain);
}
}
return g.getFactory().buildGeometry(chains);
}
private static LineString extractChain(LineString line, int index, int maxChainSize)
{
int size = maxChainSize + 1;
if (index + size > line.getNumPoints())
size = line.getNumPoints() - index;
Coordinate[] pts = new Coordinate[size];
for (int i = 0; i < size; i++) {
pts[i] = line.getCoordinateN(index + i);
}
return line.getFactory().createLineString(pts);
}
public static Geometry dissolve(Geometry geom)
{
return LineDissolver.dissolve(geom);
}
}