public static void TestEnvelope2Dintersector()
        {
            System.Collections.Generic.List <com.epl.geometry.Envelope2D> envelopes = new System.Collections.Generic.List <com.epl.geometry.Envelope2D>(0);
            com.epl.geometry.Envelope2D env0  = new com.epl.geometry.Envelope2D(2, 3, 4, 4);
            com.epl.geometry.Envelope2D env1  = new com.epl.geometry.Envelope2D(5, 13, 9, 15);
            com.epl.geometry.Envelope2D env2  = new com.epl.geometry.Envelope2D(6, 9, 11, 12);
            com.epl.geometry.Envelope2D env3  = new com.epl.geometry.Envelope2D(8, 10, 9, 17);
            com.epl.geometry.Envelope2D env4  = new com.epl.geometry.Envelope2D(11.001, 12, 14, 14);
            com.epl.geometry.Envelope2D env5  = new com.epl.geometry.Envelope2D(1, 3, 3, 4);
            com.epl.geometry.Envelope2D env6  = new com.epl.geometry.Envelope2D(0, 2, 5, 10);
            com.epl.geometry.Envelope2D env7  = new com.epl.geometry.Envelope2D(4, 7, 5, 10);
            com.epl.geometry.Envelope2D env8  = new com.epl.geometry.Envelope2D(3, 15, 15, 15);
            com.epl.geometry.Envelope2D env9  = new com.epl.geometry.Envelope2D(0, 9, 14, 9);
            com.epl.geometry.Envelope2D env10 = new com.epl.geometry.Envelope2D(0, 8.999, 14, 8.999);
            envelopes.Add(env0);
            envelopes.Add(env1);
            envelopes.Add(env2);
            envelopes.Add(env3);
            envelopes.Add(env4);
            envelopes.Add(env5);
            envelopes.Add(env6);
            envelopes.Add(env7);
            envelopes.Add(env8);
            envelopes.Add(env9);
            envelopes.Add(env10);
            com.epl.geometry.Envelope2DIntersectorImpl intersector = new com.epl.geometry.Envelope2DIntersectorImpl();
            intersector.SetTolerance(0.001);
            intersector.StartConstruction();
            for (int i = 0; i < envelopes.Count; i++)
            {
                intersector.AddEnvelope(i, envelopes[i]);
            }
            intersector.EndConstruction();
            int count = 0;

            while (intersector.Next())
            {
                int env_a = intersector.GetHandleA();
                int env_b = intersector.GetHandleB();
                count++;
                com.epl.geometry.Envelope2D env = new com.epl.geometry.Envelope2D();
                env.SetCoords(envelopes[env_a]);
                env.Inflate(0.001, 0.001);
                NUnit.Framework.Assert.IsTrue(env.IsIntersecting(envelopes[env_b]));
            }
            System.Diagnostics.Debug.Assert((count == 16));
            com.epl.geometry.Envelope2DIntersectorImpl intersector2 = new com.epl.geometry.Envelope2DIntersectorImpl();
            intersector2.SetTolerance(0.0);
            intersector2.StartConstruction();
            for (int i_1 = 0; i_1 < envelopes.Count; i_1++)
            {
                intersector2.AddEnvelope(i_1, envelopes[i_1]);
            }
            intersector2.EndConstruction();
            count = 0;
            while (intersector2.Next())
            {
                int env_a = intersector2.GetHandleA();
                int env_b = intersector2.GetHandleB();
                count++;
                com.epl.geometry.Envelope2D env = new com.epl.geometry.Envelope2D();
                env.SetCoords(envelopes[env_a]);
                NUnit.Framework.Assert.IsTrue(env.IsIntersecting(envelopes[env_b]));
            }
            System.Diagnostics.Debug.Assert((count == 13));
            env0 = new com.epl.geometry.Envelope2D(0, 0, 0, 10);
            env1 = new com.epl.geometry.Envelope2D(0, 10, 10, 10);
            env2 = new com.epl.geometry.Envelope2D(10, 0, 10, 10);
            env3 = new com.epl.geometry.Envelope2D(0, 0, 10, 0);
            envelopes.Clear();
            envelopes.Add(env0);
            envelopes.Add(env1);
            envelopes.Add(env2);
            envelopes.Add(env3);
            com.epl.geometry.Envelope2DIntersectorImpl intersector3 = new com.epl.geometry.Envelope2DIntersectorImpl();
            intersector3.SetTolerance(0.001);
            intersector3.StartConstruction();
            for (int i_2 = 0; i_2 < envelopes.Count; i_2++)
            {
                intersector3.AddEnvelope(i_2, envelopes[i_2]);
            }
            intersector3.EndConstruction();
            count = 0;
            while (intersector3.Next())
            {
                int env_a = intersector3.GetHandleA();
                int env_b = intersector3.GetHandleB();
                count++;
                com.epl.geometry.Envelope2D env = new com.epl.geometry.Envelope2D();
                env.SetCoords(envelopes[env_a]);
                NUnit.Framework.Assert.IsTrue(env.IsIntersecting(envelopes[env_b]));
            }
            NUnit.Framework.Assert.IsTrue(count == 4);
            env0 = new com.epl.geometry.Envelope2D(0, 0, 0, 10);
            envelopes.Clear();
            envelopes.Add(env0);
            envelopes.Add(env0);
            envelopes.Add(env0);
            envelopes.Add(env0);
            com.epl.geometry.Envelope2DIntersectorImpl intersector4 = new com.epl.geometry.Envelope2DIntersectorImpl();
            intersector4.SetTolerance(0.001);
            intersector4.StartConstruction();
            for (int i_3 = 0; i_3 < envelopes.Count; i_3++)
            {
                intersector4.AddEnvelope(i_3, envelopes[i_3]);
            }
            intersector4.EndConstruction();
            count = 0;
            while (intersector4.Next())
            {
                int env_a = intersector4.GetHandleA();
                int env_b = intersector4.GetHandleB();
                count++;
                com.epl.geometry.Envelope2D env = new com.epl.geometry.Envelope2D();
                env.SetCoords(envelopes[env_a]);
                NUnit.Framework.Assert.IsTrue(env.IsIntersecting(envelopes[env_b]));
            }
            System.Diagnostics.Debug.Assert((count == 6));
            env0 = new com.epl.geometry.Envelope2D(0, 10, 10, 10);
            envelopes.Clear();
            envelopes.Add(env0);
            envelopes.Add(env0);
            envelopes.Add(env0);
            envelopes.Add(env0);
            com.epl.geometry.Envelope2DIntersectorImpl intersector5 = new com.epl.geometry.Envelope2DIntersectorImpl();
            intersector5.SetTolerance(0.001);
            intersector5.StartConstruction();
            for (int i_4 = 0; i_4 < envelopes.Count; i_4++)
            {
                intersector5.AddEnvelope(i_4, envelopes[i_4]);
            }
            intersector5.EndConstruction();
            count = 0;
            while (intersector5.Next())
            {
                int env_a = intersector5.GetHandleA();
                int env_b = intersector5.GetHandleB();
                count++;
                com.epl.geometry.Envelope2D env = new com.epl.geometry.Envelope2D();
                env.SetCoords(envelopes[env_a]);
                NUnit.Framework.Assert.IsTrue(env.IsIntersecting(envelopes[env_b]));
            }
            NUnit.Framework.Assert.IsTrue(count == 6);
        }