com.vividsolutions.jtstest.function.TriangleFunctions 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.jtstest.function;
import com.vividsolutions.jts.geom.*;
import com.vividsolutions.jts.geom.util.GeometryMapper;
public class TriangleFunctions {
public static Geometry centroid(Geometry g)
{
return GeometryMapper.map(g,
new GeometryMapper.MapOp() {
public Geometry map(Geometry g) {
Coordinate[] pts = trianglePts(g);
Coordinate cc = Triangle.centroid(pts[0], pts[1], pts[2]);
GeometryFactory geomFact = FunctionsUtil.getFactoryOrDefault(g);
return geomFact.createPoint(cc);
}});
}
public static Geometry circumcentre(Geometry g)
{
return GeometryMapper.map(g,
new GeometryMapper.MapOp() {
public Geometry map(Geometry g) {
Coordinate[] pts = trianglePts(g);
Coordinate cc = Triangle.circumcentre(pts[0], pts[1], pts[2]);
GeometryFactory geomFact = FunctionsUtil.getFactoryOrDefault(g);
return geomFact.createPoint(cc);
}});
}
public static Geometry perpendicularBisectors(Geometry g)
{
Coordinate[] pts = trianglePts(g);
Coordinate cc = Triangle.circumcentre(pts[0], pts[1], pts[2]);
GeometryFactory geomFact = FunctionsUtil.getFactoryOrDefault(g);
LineString[] line = new LineString[3];
Coordinate p0 = (new LineSegment(pts[1], pts[2])).closestPoint(cc);
line[0] = geomFact.createLineString(new Coordinate[] {p0, cc});
Coordinate p1 = (new LineSegment(pts[0], pts[2])).closestPoint(cc);
line[1] = geomFact.createLineString(new Coordinate[] {p1, cc});
Coordinate p2 = (new LineSegment(pts[0], pts[1])).closestPoint(cc);
line[2] = geomFact.createLineString(new Coordinate[] {p2, cc});
return geomFact.createMultiLineString(line);
}
public static Geometry incentre(Geometry g)
{
return GeometryMapper.map(g,
new GeometryMapper.MapOp() {
public Geometry map(Geometry g) {
Coordinate[] pts = trianglePts(g);
Coordinate cc = Triangle.inCentre(pts[0], pts[1], pts[2]);
GeometryFactory geomFact = FunctionsUtil.getFactoryOrDefault(g);
return geomFact.createPoint(cc);
}});
}
public static Geometry angleBisectors(Geometry g)
{
Coordinate[] pts = trianglePts(g);
Coordinate cc = Triangle.inCentre(pts[0], pts[1], pts[2]);
GeometryFactory geomFact = FunctionsUtil.getFactoryOrDefault(g);
LineString[] line = new LineString[3];
line[0] = geomFact.createLineString(new Coordinate[] {pts[0], cc});
line[1] = geomFact.createLineString(new Coordinate[] {pts[1], cc});
line[2] = geomFact.createLineString(new Coordinate[] {pts[2], cc});
return geomFact.createMultiLineString(line);
}
private static Coordinate[] trianglePts(Geometry g)
{
Coordinate[] pts = g.getCoordinates();
if (pts.length < 3)
throw new IllegalArgumentException("Input geometry must have at least 3 points");
return pts;
}
}
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