/*
* 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.jtstest.function;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.LineString;
import com.vividsolutions.jts.geom.util.LinearComponentExtracter;
import com.vividsolutions.jts.noding.SegmentString;
import com.vividsolutions.jts.operation.buffer.BufferInputLineSimplifier;
import com.vividsolutions.jts.operation.buffer.BufferOp;
import com.vividsolutions.jts.operation.buffer.BufferParameters;
import com.vividsolutions.jts.operation.buffer.OffsetCurveBuilder;
import com.vividsolutions.jts.operation.buffer.OffsetCurveSetBuilder;
import com.vividsolutions.jts.operation.buffer.validate.BufferResultValidator;
public class BufferFunctions {
public static String bufferDescription = "Buffers a geometry by a distance";
public static Geometry buffer(Geometry g, double distance) { return g.buffer(distance); }
public static Geometry bufferWithParams(Geometry g, Double distance,
Integer quadrantSegments, Integer capStyle, Integer joinStyle, Double mitreLimit)
{
double dist = 0;
if (distance != null) dist = distance.doubleValue();
BufferParameters bufParams = new BufferParameters();
if (quadrantSegments != null) bufParams.setQuadrantSegments(quadrantSegments.intValue());
if (capStyle != null) bufParams.setEndCapStyle(capStyle.intValue());
if (joinStyle != null) bufParams.setJoinStyle(joinStyle.intValue());
if (mitreLimit != null) bufParams.setMitreLimit(mitreLimit.doubleValue());
return BufferOp.bufferOp(g, dist, bufParams);
}
public static Geometry bufferCurve(Geometry g, double distance)
{
return buildCurveSet(g, distance, new BufferParameters());
}
public static Geometry bufferCurveWithParams(Geometry g, Double distance,
Integer quadrantSegments, Integer capStyle, Integer joinStyle, Double mitreLimit)
{
double dist = 0;
if (distance != null) dist = distance.doubleValue();
BufferParameters bufParams = new BufferParameters();
if (quadrantSegments != null) bufParams.setQuadrantSegments(quadrantSegments.intValue());
if (capStyle != null) bufParams.setEndCapStyle(capStyle.intValue());
if (joinStyle != null) bufParams.setJoinStyle(joinStyle.intValue());
if (mitreLimit != null) bufParams.setMitreLimit(mitreLimit.doubleValue());
return buildCurveSet(g, dist, bufParams);
}
private static Geometry buildCurveSet(Geometry g, double dist, BufferParameters bufParams)
{
// --- now construct curve
OffsetCurveBuilder ocb = new OffsetCurveBuilder(
g.getFactory().getPrecisionModel(),
bufParams);
OffsetCurveSetBuilder ocsb = new OffsetCurveSetBuilder(g, dist, ocb);
List curves = ocsb.getCurves();
List lines = new ArrayList();
for (Iterator i = curves.iterator(); i.hasNext(); ) {
SegmentString ss = (SegmentString) i.next();
Coordinate[] pts = ss.getCoordinates();
lines.add(g.getFactory().createLineString(pts));
}
Geometry curve = g.getFactory().buildGeometry(lines);
return curve;
}
public static Geometry bufferLineSimplifier(Geometry g, double distance)
{
return buildBufferLineSimplifiedSet(g, distance);
}
private static Geometry buildBufferLineSimplifiedSet(Geometry g, double distance)
{
List simpLines = new ArrayList();
List lines = new ArrayList();
LinearComponentExtracter.getLines(g, lines);
for (Iterator i = lines.iterator(); i.hasNext(); ) {
LineString line = (LineString) i.next();
Coordinate[] pts = line.getCoordinates();
simpLines.add(g.getFactory().createLineString(BufferInputLineSimplifier.simplify(pts, distance)));
}
Geometry simpGeom = g.getFactory().buildGeometry(simpLines);
return simpGeom;
}
public static Geometry bufferValidated(Geometry g, double distance)
{
Geometry buf = g.buffer(distance);
String errMsg = BufferResultValidator.isValidMsg(g, distance, buf);
if (errMsg != null)
throw new IllegalStateException("Buffer Validation error: " + errMsg);
return buf;
}
public static Geometry bufferValidatedGeom(Geometry g, double distance)
{
Geometry buf = g.buffer(distance);
BufferResultValidator validator = new BufferResultValidator(g, distance, buf);
boolean isValid = validator.isValid();
return validator.getErrorIndicator();
}
public static Geometry singleSidedBufferCurve(Geometry geom, double distance) {
BufferParameters bufParam = new BufferParameters();
bufParam.setSingleSided(true);
OffsetCurveBuilder ocb = new OffsetCurveBuilder(
geom.getFactory().getPrecisionModel(), bufParam
);
Coordinate[] pts = ocb.getLineCurve(geom.getCoordinates(), distance);
Geometry curve = geom.getFactory().createLineString(pts);
return curve;
}
public static Geometry singleSidedBuffer(Geometry geom, double distance) {
BufferParameters bufParams = new BufferParameters();
bufParams.setSingleSided(true);
return BufferOp.bufferOp(geom, distance, bufParams);
}
}