code: /*
   Copyright 1995-2017 Esri
  
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
         http://www.apache.org/licenses/LICENSE-2.0
  
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
  
   For additional information, contact:
   Environmental Systems Research Institute, Inc.
   Attn: Contracts Dept
   380 New York Street
   Redlands, California, USA 92373
  
   email: contracts@esri.com
   */
  
  package com.esri.core.geometry;
  
  import junit.framework.TestCase;
  import org.junit.Test;
  
  public class TestUnion extends TestCase {
  	@Override
  	protected void setUp() throws Exception {
  		super.setUp();
  	}
  
  	@Override
  	protected void tearDown() throws Exception {
  		super.tearDown();
  	}
  
  	@Test
  	public static void testUnion() {
  		Envelope env1 = new Envelope(10, 10, 30, 50);
  		Envelope env2 = new Envelope(30, 10, 60, 50);
  		Geometry[] geomArray = new Geometry[] { env1, env2 };
  		SimpleGeometryCursor inputGeometries = new SimpleGeometryCursor(
  				geomArray);
  		OperatorUnion union = (OperatorUnion) OperatorFactoryLocal
  				.getInstance().getOperator(Operator.Type.Union);
  
  		SpatialReference sr = SpatialReference.create(4326);
  
  		GeometryCursor outputCursor = union.execute(inputGeometries, sr, null);
  		Geometry result = outputCursor.next();
  
  		MultiPath path = (MultiPath)result;
  		assertEquals(1, path.getPathCount());
  		assertEquals(6, path.getPathEnd(0));
  		assertEquals(new Point2D(10, 10), path.getXY(0));
  		assertEquals(new Point2D(10, 50), path.getXY(1));
  		assertEquals(new Point2D(30, 50), path.getXY(2));
  		assertEquals(new Point2D(60, 50), path.getXY(3));
  		assertEquals(new Point2D(60, 10), path.getXY(4));
  		assertEquals(new Point2D(30, 10), path.getXY(5));
  	}
  
  	@Test
  	public static void testUnionDistinctGeometries() {
  		Envelope env = new Envelope(1, 5, 3, 10);
  
  		Polygon polygon = new Polygon();
  		polygon.startPath(new Point(4, 3));
  		polygon.lineTo(new Point(7, 6));
  		polygon.lineTo(new Point(6, 8));
  		polygon.lineTo(new Point(4, 3));
  
  		Geometry[] geomArray = new Geometry[] { env, polygon };
  		SimpleGeometryCursor inputGeometries = new SimpleGeometryCursor(
  				geomArray);
  		OperatorUnion union = (OperatorUnion) OperatorFactoryLocal
  				.getInstance().getOperator(Operator.Type.Union);
  		SpatialReference sr = SpatialReference.create(4326);
  
  		GeometryCursor outputCursor = union.execute(inputGeometries, sr, null);
  		Geometry result = outputCursor.next();
  
  		MultiPath path = (MultiPath)result;
  		assertEquals(2, path.getPathCount());
  
  		assertEquals(3, path.getPathEnd(0));
  		assertEquals(7, path.getPathEnd(1));
  		// from polygon
  		assertEquals(new Point2D(4, 3), path.getXY(0));
  		assertEquals(new Point2D(6, 8), path.getXY(1));
  		assertEquals(new Point2D(7, 6), path.getXY(2));
  		// from envelope
  		assertEquals(new Point2D(1, 5), path.getXY(3));
  		assertEquals(new Point2D(1, 10), path.getXY(4));
  		assertEquals(new Point2D(3, 10), path.getXY(5));
  		assertEquals(new Point2D(3, 5), path.getXY(6));
  	}
  
  	@Test
  	public static void testUnionCoincidentPolygons() {
  		Polygon polygon1 = new Polygon();
  		polygon1.startPath(new Point(3, 2));
  		polygon1.lineTo(new Point(1, 2));
  		polygon1.lineTo(new Point(1, 4));
  		polygon1.lineTo(new Point(3, 4));
  		polygon1.lineTo(new Point(3, 2));
  
  		Polygon polygon2 = new Polygon();
  		polygon2.startPath(new Point(1, 2));
  		polygon2.lineTo(new Point(1, 4));
  		polygon2.lineTo(new Point(3, 4));
  		polygon2.lineTo(new Point(3, 2));
  		polygon2.lineTo(new Point(1, 2));
  
  		Geometry[] geomArray = new Geometry[] { polygon1, polygon2 };
  		SimpleGeometryCursor inputGeometries = new SimpleGeometryCursor(
  				geomArray);
  		OperatorUnion union = (OperatorUnion) OperatorFactoryLocal
  				.getInstance().getOperator(Operator.Type.Union);
  		SpatialReference sr = SpatialReference.create(4326);
  
  		GeometryCursor outputCursor = union.execute(inputGeometries, sr, null);
  		Geometry result = outputCursor.next();
  
  		MultiPath path = (MultiPath)result;
  		assertEquals(1, path.getPathCount());
  		assertEquals(4, path.getPathEnd(0));
  		assertEquals(new Point2D(1, 2), path.getXY(0));
  		assertEquals(new Point2D(1, 4), path.getXY(1));
  		assertEquals(new Point2D(3, 4), path.getXY(2));
  		assertEquals(new Point2D(3, 2), path.getXY(3));
  	}
  
  	@Test
  	public static void testUnionCoincidentPolygonsWithReverseWinding() {
  		// Input polygons have CCW winding, result is always CW
  		Polygon polygon1 = new Polygon();
  		polygon1.startPath(new Point(3, 2));
  		polygon1.lineTo(new Point(3, 4));
  		polygon1.lineTo(new Point(1, 4));
  		polygon1.lineTo(new Point(1, 2));
  		polygon1.lineTo(new Point(3, 2));
  
  		Polygon polygon2 = new Polygon();
  		polygon2.startPath(new Point(1, 2));
  		polygon2.lineTo(new Point(3, 2));
  		polygon2.lineTo(new Point(3, 4));
  		polygon2.lineTo(new Point(1, 4));
  		polygon2.lineTo(new Point(1, 2));
  
  		Polygon expectedPolygon = new Polygon();
  		expectedPolygon.startPath(new Point(1, 2));
  		expectedPolygon.lineTo(new Point(1, 4));
  		expectedPolygon.lineTo(new Point(3, 4));
  		expectedPolygon.lineTo(new Point(3, 2));
  		expectedPolygon.lineTo(new Point(1, 2));
  
  		Geometry[] geomArray = new Geometry[] { polygon1, polygon2 };
  		SimpleGeometryCursor inputGeometries = new SimpleGeometryCursor(
  				geomArray);
  		OperatorUnion union = (OperatorUnion) OperatorFactoryLocal
  				.getInstance().getOperator(Operator.Type.Union);
  		SpatialReference sr = SpatialReference.create(4326);
  
  		GeometryCursor outputCursor = union.execute(inputGeometries, sr, null);
  		Geometry result = outputCursor.next();
  
  		MultiPath path = (MultiPath)result;
  		assertEquals(1, path.getPathCount());
  		assertEquals(4, path.getPathEnd(0));
  		assertEquals(new Point2D(1, 2), path.getXY(0));
  		assertEquals(new Point2D(1, 4), path.getXY(1));
  		assertEquals(new Point2D(3, 4), path.getXY(2));
  		assertEquals(new Point2D(3, 2), path.getXY(3));
  	}
  }
  