/// <summary>
 /// Initializes a new instance of the <see cref="SugiyamaLayoutAlgorithm{TVertex,TEdge,TGraph}"/> class.
 /// </summary>
 /// <param name="visitedGraph">Graph to layout.</param>
 /// <param name="verticesSizes">Vertices sizes.</param>
 /// <param name="parameters">Optional algorithm parameters.</param>
 public SugiyamaLayoutAlgorithm(
     [NotNull] TGraph visitedGraph,
     [CanBeNull] IDictionary <TVertex, Size> verticesSizes,
     [CanBeNull] SugiyamaLayoutParameters parameters = null)
     : this(visitedGraph, null, verticesSizes, parameters)
 {
 }
 /// <summary>
 /// Initializes a new instance of the <see cref="SugiyamaLayoutAlgorithm{TVertex,TEdge,TGraph}"/> class.
 /// </summary>
 /// <param name="visitedGraph">Graph to layout.</param>
 /// <param name="verticesPositions">Vertices positions.</param>
 /// <param name="verticesSizes">Vertices sizes.</param>
 /// <param name="parameters">Optional algorithm parameters.</param>
 public SugiyamaLayoutAlgorithm(
     [NotNull] TGraph visitedGraph,
     [CanBeNull] IDictionary <TVertex, Point> verticesPositions,
     [CanBeNull] IDictionary <TVertex, Size> verticesSizes,
     [CanBeNull] SugiyamaLayoutParameters parameters = null)
     : base(visitedGraph, verticesPositions, parameters)
 {
     _verticesSizes = verticesSizes;
 }
 /// <summary>
 /// Initializes a new instance of the <see cref="SugiyamaLayoutAlgorithm{TVertex,TEdge,TGraph}"/> class.
 /// </summary>
 /// <param name="visitedGraph">Graph to layout.</param>
 /// <param name="parameters">Optional algorithm parameters.</param>
 public SugiyamaLayoutAlgorithm(
     [NotNull] TGraph visitedGraph,
     [CanBeNull] SugiyamaLayoutParameters parameters = null)
     : this(visitedGraph, null, null, parameters)
 {
 }