public void InvalidParameters()
        {
            var parameters = new FreeFRLayoutParameters();

            Assert.Throws <ArgumentOutOfRangeException>(() => parameters.VertexCount     = -1);
            Assert.Throws <ArgumentOutOfRangeException>(() => parameters.MaxIterations   = -1);
            Assert.Throws <ArgumentOutOfRangeException>(() => parameters.IdealEdgeLength = -1);
        }
        public void Constructor_Throws()
        {
            var verticesPositions = new Dictionary <string, Point>();
            var parameters        = new FreeFRLayoutParameters();

            // ReSharper disable ObjectCreationAsStatement
            // ReSharper disable AssignNullToNotNullAttribute
            Assert.Throws <ArgumentNullException>(
                () => new FRLayoutAlgorithm <string, Edge <string>, IBidirectionalGraph <string, Edge <string> > >(null, parameters));
            Assert.Throws <ArgumentNullException>(
                () => new FRLayoutAlgorithm <string, Edge <string>, IBidirectionalGraph <string, Edge <string> > >(null, verticesPositions, parameters));
            // ReSharper restore AssignNullToNotNullAttribute
            // ReSharper restore ObjectCreationAsStatement
        }
Beispiel #3
0
        /// <summary>
        /// Performs the actual layout algorithm.
        /// </summary>
        /// <param name="graph">The object containing the graph data</param>
        /// <param name="rootNode">Root node</param>
        protected override void PerformLayout(GraphMapData graph, INode rootNode)
        {
            AdjacencyGraph <string, Edge <string> > adjacencyGraph = GraphSharpUtility.GetAdjacencyGraph(graph);
            IDictionary <string, Vector>            nodePositions  = GraphSharpUtility.GetNodePositions(graph);
            FreeFRLayoutParameters freeFRLayoutParameters          = new FreeFRLayoutParameters()
            {
                IdealEdgeLength = 125D
            };

            FRLayoutAlgorithm <string, Edge <string>, AdjacencyGraph <string, Edge <string> > > frLayoutAlgorithm = new FRLayoutAlgorithm <string, Edge <string>, AdjacencyGraph <string, Edge <string> > >(adjacencyGraph, nodePositions, freeFRLayoutParameters);

            frLayoutAlgorithm.Compute();

            GraphSharpUtility.SetNodePositions(graph, frLayoutAlgorithm.VertexPositions);
            GraphSharpUtility.FSAOverlapRemoval(graph);
        }
        public void Clone()
        {
            var parameters       = new FreeFRLayoutParameters();
            var clonedParameters = (FreeFRLayoutParameters)parameters.Clone();

            Assert.AreEqual(parameters, clonedParameters);

            parameters                      = new FreeFRLayoutParameters();
            parameters.VertexCount          = 20;
            parameters.AttractionMultiplier = 1.5;
            parameters.RepulsiveMultiplier  = 0.7;
            parameters.MaxIterations        = 150;
            parameters.Lambda               = 0.9;
            parameters.CoolingFunction      = FRCoolingFunction.Linear;
            parameters.IdealEdgeLength      = 15;
            clonedParameters                = (FreeFRLayoutParameters)parameters.Clone();

            Assert.AreEqual(parameters, clonedParameters);
        }
Beispiel #5
0
        public void Evaluate(int SpreadMax)
        {
            if (FBuild[0] || (pd.InputChanged && init))
            {
                graph.Clear();
                VSize.Clear();
                VThickness.Clear();
                VType.Clear();
                VPos.Clear();
                VCache.Clear();

                for (int i = 0; i < FVertices.SliceCount; i++)
                {
                    graph.AddVertex(FVertices[i]);
                    VSize.Add(FVertices[i], new Size(FVSize[i], FVSize[i]));
                    VThickness.Add(FVertices[i], new Thickness(1.0));
                    VType.Add(FVertices[i], FVType[i]);
                    VPos.Add(FVertices[i], new Point(FVPos[i].x, FVPos[i].y));
                    VCache.Add(FVertices[i]);
                }
                for (int i = 0; i < Math.Max(FEdgeFrom.SliceCount, FEdgeTo.SliceCount); i++)
                {
                    graph.AddEdge(new Edge <string>(FEdgeFrom[i], FEdgeTo[i]));
                }

                var cparams = new FreeFRLayoutParameters();
                foreach (var prop in typeof(FreeFRLayoutParameters).GetProperties())
                {
                    var input = pd.InputPins[prop.Name].Spread[0];
                    if (!(input.ToString().StartsWith("0") && input.ToString().EndsWith("0")))
                    {
                        prop.SetValue(cparams, pd.InputPins[prop.Name].Spread[0]);
                    }
                }
                layout = new FRLayoutAlgorithm <string, IEdge <string>, BidirectionalGraph <string, IEdge <string> > >(graph, VPos, cparams);
                foreach (var prop in typeof(FreeFRLayoutParameters).GetProperties())
                {
                    var input = pd.InputPins[prop.Name].Spread[0];
                    if (!(input.ToString().StartsWith("0") && input.ToString().EndsWith("0")))
                    {
                        prop.SetValue(layout.Parameters, pd.InputPins[prop.Name].Spread[0]);
                    }
                }
                layout.Finished += (sender, args) =>
                {
                    FPosOut.SliceCount = VCache.Count;
                    for (int i = 0; i < VCache.Count; i++)
                    {
                        var point = layout.VertexPositions[VCache[i]];
                        FPosOut[i] = new Vector2D(point.X, point.Y);
                    }
                };
                if (FAsync[0])
                {
                    Task.Run(() =>
                    {
                        layout.Compute();
                    });
                }
                else
                {
                    layout.Compute();
                }
                init = true;
            }
            if (layout != null)
            {
                FState[0] = layout.State.ToString();
            }
        }
        public void StandardFactory()
        {
            var positions     = new Dictionary <TestVertex, Point>();
            var sizes         = new Dictionary <TestVertex, Size>();
            var borders       = new Dictionary <TestVertex, Thickness>();
            var layoutTypes   = new Dictionary <TestVertex, CompoundVertexInnerLayoutType>();
            var graph         = new BidirectionalGraph <TestVertex, Edge <TestVertex> >();
            var simpleContext = new LayoutContext <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(
                graph,
                positions,
                sizes,
                LayoutMode.Simple);
            var compoundContext1 = new LayoutContext <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(
                graph,
                positions,
                sizes,
                LayoutMode.Compound);
            var compoundContext2 = new CompoundLayoutContext <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(
                graph,
                positions,
                sizes,
                LayoutMode.Compound,
                borders,
                layoutTypes);
            var nullGraphContext = new LayoutContext <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(
                null,
                positions,
                sizes,
                LayoutMode.Simple);

            var factory = new StandardLayoutAlgorithmFactory <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >();

            CollectionAssert.AreEqual(
                new[]
            {
                "Circular", "Tree", "FR", "BoundedFR", "KK",
                "ISOM", "LinLog", "Sugiyama", "CompoundFDP",
                "Random"
            },
                factory.AlgorithmTypes);


            Assert.IsNull(
                factory.CreateAlgorithm(
                    string.Empty,
                    simpleContext,
                    new CircularLayoutParameters()));

            Assert.IsNull(
                factory.CreateAlgorithm(
                    "NotExist",
                    simpleContext,
                    new CircularLayoutParameters()));

            Assert.IsNull(
                factory.CreateAlgorithm(
                    "Circular",
                    nullGraphContext,
                    new CircularLayoutParameters()));

            Assert.IsInstanceOf <CircularLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "Circular",
                    simpleContext,
                    new CircularLayoutParameters()));

            Assert.IsInstanceOf <SimpleTreeLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "Tree",
                    simpleContext,
                    new SimpleTreeLayoutParameters()));

            Assert.IsInstanceOf <FRLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "FR",
                    simpleContext,
                    new FreeFRLayoutParameters()));

            Assert.IsInstanceOf <FRLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "BoundedFR",
                    simpleContext,
                    new BoundedFRLayoutParameters()));

            Assert.IsInstanceOf <KKLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "KK",
                    simpleContext,
                    new KKLayoutParameters()));

            Assert.IsInstanceOf <ISOMLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "ISOM",
                    simpleContext,
                    new ISOMLayoutParameters()));

            Assert.IsInstanceOf <LinLogLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "LinLog",
                    simpleContext,
                    new LinLogLayoutParameters()));

            Assert.IsInstanceOf <SugiyamaLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "Sugiyama",
                    simpleContext,
                    new SugiyamaLayoutParameters()));

            Assert.IsInstanceOf <CompoundFDPLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "CompoundFDP",
                    simpleContext,
                    new CompoundFDPLayoutParameters()));

            Assert.IsInstanceOf <RandomLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "Random",
                    simpleContext,
                    new RandomLayoutParameters()));

            Assert.IsNull(
                factory.CreateAlgorithm(
                    "CompoundFDP",
                    compoundContext1,
                    new CompoundFDPLayoutParameters()));

            Assert.IsNull(
                factory.CreateAlgorithm(
                    "Circular",
                    compoundContext2,
                    new CompoundFDPLayoutParameters()));

            Assert.IsInstanceOf <CompoundFDPLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > > >(
                factory.CreateAlgorithm(
                    "CompoundFDP",
                    compoundContext2,
                    new CompoundFDPLayoutParameters()));


            var testParameters     = new TestLayoutParameters();
            var circularParameters = new CircularLayoutParameters();
            ILayoutParameters createdParameters = factory.CreateParameters(string.Empty, circularParameters);

            Assert.IsNull(createdParameters);

            createdParameters = factory.CreateParameters("NotExist", circularParameters);
            Assert.IsNull(createdParameters);

            createdParameters = factory.CreateParameters("Circular", null);
            Assert.IsInstanceOf <CircularLayoutParameters>(createdParameters);
            Assert.AreNotSame(circularParameters, createdParameters);

            createdParameters = factory.CreateParameters("Circular", testParameters);
            Assert.IsInstanceOf <CircularLayoutParameters>(createdParameters);
            Assert.AreNotSame(testParameters, createdParameters);

            createdParameters = factory.CreateParameters("Circular", circularParameters);
            Assert.IsInstanceOf <CircularLayoutParameters>(createdParameters);
            Assert.AreNotSame(circularParameters, createdParameters);

            var treeParameters = new SimpleTreeLayoutParameters();

            createdParameters = factory.CreateParameters("Tree", null);
            Assert.IsInstanceOf <SimpleTreeLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("Tree", testParameters);
            Assert.IsInstanceOf <SimpleTreeLayoutParameters>(createdParameters);
            Assert.AreNotSame(testParameters, createdParameters);

            createdParameters = factory.CreateParameters("Tree", treeParameters);
            Assert.IsInstanceOf <SimpleTreeLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            var frParameters = new FreeFRLayoutParameters();

            createdParameters = factory.CreateParameters("FR", null);
            Assert.IsInstanceOf <FreeFRLayoutParameters>(createdParameters);
            Assert.AreNotSame(frParameters, createdParameters);

            createdParameters = factory.CreateParameters("FR", testParameters);
            Assert.IsInstanceOf <FreeFRLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("FR", frParameters);
            Assert.IsInstanceOf <FreeFRLayoutParameters>(createdParameters);
            Assert.AreNotSame(frParameters, createdParameters);

            var boundedFrParameters = new BoundedFRLayoutParameters();

            createdParameters = factory.CreateParameters("BoundedFR", null);
            Assert.IsInstanceOf <BoundedFRLayoutParameters>(createdParameters);
            Assert.AreNotSame(boundedFrParameters, createdParameters);

            createdParameters = factory.CreateParameters("BoundedFR", testParameters);
            Assert.IsInstanceOf <BoundedFRLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("BoundedFR", boundedFrParameters);
            Assert.IsInstanceOf <BoundedFRLayoutParameters>(createdParameters);
            Assert.AreNotSame(boundedFrParameters, createdParameters);

            var kkParameters = new KKLayoutParameters();

            createdParameters = factory.CreateParameters("KK", null);
            Assert.IsInstanceOf <KKLayoutParameters>(createdParameters);
            Assert.AreNotSame(kkParameters, createdParameters);

            createdParameters = factory.CreateParameters("KK", testParameters);
            Assert.IsInstanceOf <KKLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("KK", kkParameters);
            Assert.IsInstanceOf <KKLayoutParameters>(createdParameters);
            Assert.AreNotSame(kkParameters, createdParameters);

            var isomParameters = new ISOMLayoutParameters();

            createdParameters = factory.CreateParameters("ISOM", null);
            Assert.IsInstanceOf <ISOMLayoutParameters>(createdParameters);
            Assert.AreNotSame(isomParameters, createdParameters);

            createdParameters = factory.CreateParameters("ISOM", testParameters);
            Assert.IsInstanceOf <ISOMLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("ISOM", isomParameters);
            Assert.IsInstanceOf <ISOMLayoutParameters>(createdParameters);
            Assert.AreNotSame(isomParameters, createdParameters);

            var linLogParameters = new LinLogLayoutParameters();

            createdParameters = factory.CreateParameters("LinLog", null);
            Assert.IsInstanceOf <LinLogLayoutParameters>(createdParameters);
            Assert.AreNotSame(linLogParameters, createdParameters);

            createdParameters = factory.CreateParameters("LinLog", testParameters);
            Assert.IsInstanceOf <LinLogLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("LinLog", linLogParameters);
            Assert.IsInstanceOf <LinLogLayoutParameters>(createdParameters);
            Assert.AreNotSame(linLogParameters, createdParameters);

            var sugiyamaParameters = new SugiyamaLayoutParameters();

            createdParameters = factory.CreateParameters("Sugiyama", null);
            Assert.IsInstanceOf <SugiyamaLayoutParameters>(createdParameters);
            Assert.AreNotSame(sugiyamaParameters, createdParameters);

            createdParameters = factory.CreateParameters("Sugiyama", testParameters);
            Assert.IsInstanceOf <SugiyamaLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("Sugiyama", sugiyamaParameters);
            Assert.IsInstanceOf <SugiyamaLayoutParameters>(createdParameters);
            Assert.AreNotSame(sugiyamaParameters, createdParameters);

            var compoundFDPParameters = new CompoundFDPLayoutParameters();

            createdParameters = factory.CreateParameters("CompoundFDP", null);
            Assert.IsInstanceOf <CompoundFDPLayoutParameters>(createdParameters);
            Assert.AreNotSame(compoundFDPParameters, createdParameters);

            createdParameters = factory.CreateParameters("CompoundFDP", testParameters);
            Assert.IsInstanceOf <CompoundFDPLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("CompoundFDP", compoundFDPParameters);
            Assert.IsInstanceOf <CompoundFDPLayoutParameters>(createdParameters);
            Assert.AreNotSame(compoundFDPParameters, createdParameters);

            var randomParameters = new RandomLayoutParameters();

            createdParameters = factory.CreateParameters("Random", null);
            Assert.IsInstanceOf <RandomLayoutParameters>(createdParameters);
            Assert.AreNotSame(randomParameters, createdParameters);

            createdParameters = factory.CreateParameters("Random", testParameters);
            Assert.IsInstanceOf <RandomLayoutParameters>(createdParameters);
            Assert.AreNotSame(treeParameters, createdParameters);

            createdParameters = factory.CreateParameters("Random", randomParameters);
            Assert.IsInstanceOf <RandomLayoutParameters>(createdParameters);
            Assert.AreNotSame(randomParameters, createdParameters);


            Assert.IsFalse(factory.IsValidAlgorithm(null));
            Assert.IsFalse(factory.IsValidAlgorithm(string.Empty));
            Assert.IsTrue(factory.IsValidAlgorithm("Circular"));
            Assert.IsFalse(factory.IsValidAlgorithm("circular"));
            Assert.IsTrue(factory.IsValidAlgorithm("Tree"));
            Assert.IsTrue(factory.IsValidAlgorithm("FR"));
            Assert.IsTrue(factory.IsValidAlgorithm("BoundedFR"));
            Assert.IsTrue(factory.IsValidAlgorithm("KK"));
            Assert.IsTrue(factory.IsValidAlgorithm("ISOM"));
            Assert.IsTrue(factory.IsValidAlgorithm("LinLog"));
            Assert.IsTrue(factory.IsValidAlgorithm("Sugiyama"));
            Assert.IsTrue(factory.IsValidAlgorithm("CompoundFDP"));
            Assert.IsTrue(factory.IsValidAlgorithm("Random"));


            var algorithm1 = new TestLayoutAlgorithm();

            Assert.IsEmpty(factory.GetAlgorithmType(algorithm1));

            var algorithm2 = new CircularLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, positions, sizes, circularParameters);

            Assert.AreEqual("Circular", factory.GetAlgorithmType(algorithm2));

            var algorithm3 = new SimpleTreeLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, positions, sizes, treeParameters);

            Assert.AreEqual("Tree", factory.GetAlgorithmType(algorithm3));

            var algorithm4 = new FRLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, positions, frParameters);

            Assert.AreEqual("FR", factory.GetAlgorithmType(algorithm4));

            var algorithm5 = new FRLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, positions, boundedFrParameters);

            Assert.AreEqual("BoundedFR", factory.GetAlgorithmType(algorithm5));

            var algorithm6 = new KKLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, positions, kkParameters);

            Assert.AreEqual("KK", factory.GetAlgorithmType(algorithm6));

            var algorithm7 = new ISOMLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, positions, isomParameters);

            Assert.AreEqual("ISOM", factory.GetAlgorithmType(algorithm7));

            var algorithm8 = new LinLogLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph);

            Assert.AreEqual("LinLog", factory.GetAlgorithmType(algorithm8));

            var algorithm9 = new SugiyamaLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, positions, sizes, sugiyamaParameters);

            Assert.AreEqual("Sugiyama", factory.GetAlgorithmType(algorithm9));

            var algorithm10 = new CompoundFDPLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, sizes, borders, layoutTypes);

            Assert.AreEqual("CompoundFDP", factory.GetAlgorithmType(algorithm10));

            var algorithm11 = new RandomLayoutAlgorithm <TestVertex, Edge <TestVertex>, BidirectionalGraph <TestVertex, Edge <TestVertex> > >(graph, sizes, null, randomParameters);

            Assert.AreEqual("Random", factory.GetAlgorithmType(algorithm11));


            Assert.IsFalse(factory.NeedEdgeRouting(string.Empty));
            Assert.IsTrue(factory.NeedEdgeRouting("Circular"));
            Assert.IsTrue(factory.NeedEdgeRouting("Tree"));
            Assert.IsTrue(factory.NeedEdgeRouting("FR"));
            Assert.IsTrue(factory.NeedEdgeRouting("BoundedFR"));
            Assert.IsTrue(factory.NeedEdgeRouting("KK"));
            Assert.IsTrue(factory.NeedEdgeRouting("ISOM"));
            Assert.IsTrue(factory.NeedEdgeRouting("LinLog"));
            Assert.IsFalse(factory.NeedEdgeRouting("Sugiyama"));
            Assert.IsTrue(factory.NeedEdgeRouting("CompoundFDP"));
            Assert.IsTrue(factory.NeedEdgeRouting("Random"));


            Assert.IsFalse(factory.NeedOverlapRemoval(string.Empty));
            Assert.IsFalse(factory.NeedOverlapRemoval("Circular"));
            Assert.IsFalse(factory.NeedOverlapRemoval("Tree"));
            Assert.IsTrue(factory.NeedOverlapRemoval("FR"));
            Assert.IsTrue(factory.NeedOverlapRemoval("BoundedFR"));
            Assert.IsTrue(factory.NeedOverlapRemoval("KK"));
            Assert.IsTrue(factory.NeedOverlapRemoval("ISOM"));
            Assert.IsTrue(factory.NeedOverlapRemoval("LinLog"));
            Assert.IsFalse(factory.NeedOverlapRemoval("Sugiyama"));
            Assert.IsFalse(factory.NeedOverlapRemoval("CompoundFDP"));
            Assert.IsTrue(factory.NeedOverlapRemoval("Random"));
        }
        public void ParameterRaise()
        {
            HashSet <string> expectedPropertyNames = null;

            var parameters = new FreeFRLayoutParameters();

            parameters.PropertyChanged += (sender, args) =>
            {
                // ReSharper disable AccessToModifiedClosure
                if (expectedPropertyNames is null)
                {
                    Assert.Fail("Must not raise.");
                }
                else
                {
                    Assert.IsTrue(expectedPropertyNames.Remove(args.PropertyName));
                }
                // ReSharper restore AccessToModifiedClosure
            };

            parameters.VertexCount = 0;

            expectedPropertyNames = new HashSet <string>
            {
                nameof(FreeFRLayoutParameters.VertexCount),
                nameof(FreeFRLayoutParameters.ConstantOfRepulsion),
                nameof(FreeFRLayoutParameters.ConstantOfAttraction),
                nameof(FreeFRLayoutParameters.InitialTemperature)
            };
            parameters.VertexCount = 10;
            CollectionAssert.IsEmpty(expectedPropertyNames);

            expectedPropertyNames           = null;
            parameters.AttractionMultiplier = 1.2;

            expectedPropertyNames = new HashSet <string>
            {
                nameof(FreeFRLayoutParameters.AttractionMultiplier),
                nameof(FreeFRLayoutParameters.ConstantOfAttraction)
            };
            parameters.AttractionMultiplier = 1.4;
            CollectionAssert.IsEmpty(expectedPropertyNames);

            expectedPropertyNames          = null;
            parameters.RepulsiveMultiplier = 0.6;

            expectedPropertyNames = new HashSet <string>
            {
                nameof(FreeFRLayoutParameters.RepulsiveMultiplier),
                nameof(FreeFRLayoutParameters.ConstantOfRepulsion)
            };
            parameters.RepulsiveMultiplier = 0.7;
            CollectionAssert.IsEmpty(expectedPropertyNames);

            expectedPropertyNames    = null;
            parameters.MaxIterations = 200;

            expectedPropertyNames = new HashSet <string>
            {
                nameof(FreeFRLayoutParameters.MaxIterations)
            };
            parameters.MaxIterations = 150;
            CollectionAssert.IsEmpty(expectedPropertyNames);

            expectedPropertyNames = null;
            parameters.Lambda     = 0.95;

            expectedPropertyNames = new HashSet <string>
            {
                nameof(FreeFRLayoutParameters.Lambda)
            };
            parameters.Lambda = 0.99;
            CollectionAssert.IsEmpty(expectedPropertyNames);

            expectedPropertyNames      = null;
            parameters.CoolingFunction = FRCoolingFunction.Exponential;

            expectedPropertyNames = new HashSet <string>
            {
                nameof(FreeFRLayoutParameters.CoolingFunction)
            };
            parameters.CoolingFunction = FRCoolingFunction.Linear;
            CollectionAssert.IsEmpty(expectedPropertyNames);

            expectedPropertyNames      = null;
            parameters.IdealEdgeLength = 10;

            expectedPropertyNames = new HashSet <string>
            {
                nameof(FreeFRLayoutParameters.IdealEdgeLength),
                nameof(FreeFRLayoutParameters.ConstantOfRepulsion),
                nameof(FreeFRLayoutParameters.ConstantOfAttraction),
                nameof(FreeFRLayoutParameters.K),
                nameof(FreeFRLayoutParameters.InitialTemperature)
            };
            parameters.IdealEdgeLength = 12;
            CollectionAssert.IsEmpty(expectedPropertyNames);
        }