/// <summary>
/// Returns a new GraphComponents instance that represents connected nodes
/// as partition nodes
/// </summary>
/// <param name="Scope">The scope of the graph data being partitioned</param>
/// <returns>a GraphComponents instance</returns>
public GraphComponents GetConnectedComponents(string _scope)
{
GraphComponents partitionedGraph = new GraphComponents(_scope);
// Get all the node view models contained in the target scope
List <NodeViewModelBase> nodeVMs = new List <NodeViewModelBase>(GetGraphComponents(_scope).GetNodeViewModels().Cast <NodeViewModelBase>().ToList());
PartitionNode connectedComponent = GetNextConnectedComponent(nodeVMs, _scope);
// Continue getting the next connected component
// as long as the last connected component was
// not null
while (connectedComponent != null)
{
// Instruct the partition node to calculate its dimensions
connectedComponent.RecalculateDimensions();
// Add the partition node to the partion graph
partitionedGraph.AddNodeViewModel(connectedComponent);
//partitionedGraph.AddNode(connectedComponent);
// Get the next connected component
connectedComponent = GetNextConnectedComponent(nodeVMs, _scope);
}
return(partitionedGraph);
}
/// <summary>
/// Returns a PartitionNode instance for the next connected
/// component contained in the provided list. The collection
/// provided is altered and should not be changed between calls
/// to this method.
/// </summary>
/// <param name="nodeVMs">The collection of node view models to be processed</param>
/// <param name="partitionGraphScope">The scope for the paritioned graph</param>
/// <param name="originalScope">The scope for the original graph</param>
/// <returns>a PartitionNode containing a set of connected nodes</returns>
private PartitionNode GetNextConnectedComponent(IList <NodeViewModelBase> nodeVMs, string scope)
{
// Make sure node view models were provided
if (nodeVMs.Count == 0)
{
return(null);
}
// Create a new partition node to hold these components
PartitionNode partitionNode = new PartitionNode(scope, "PN-" + nodeVMs.Count);
// Start at the first nodeVMs
List <NodeViewModelBase> visitedNodes = new List <NodeViewModelBase>();
List <NodeViewModelBase> rootNodes = new List <NodeViewModelBase>();
// Add the first node view model to the root and visited lists
rootNodes.Add(nodeVMs[0]);
visitedNodes.Add(nodeVMs[0]);
// Itterate over the root nodes
while (rootNodes.Count > 0)
{
int currentNodeIndex = 0;
// Add the current node view model to the
// current PartitionNode
partitionNode.AddNode(rootNodes[currentNodeIndex]);
// Itterate over the node's neighbors
foreach (Model.INode node in GetGraphComponents(rootNodes[currentNodeIndex].Scope).Data.Neighbors(rootNodes[currentNodeIndex].ParentNode))
{
// Get the nodeVM for this node
NodeViewModelBase nodeVM = GetGraphComponents(rootNodes[currentNodeIndex].Scope).GetNodeViewModel(node) as NodeViewModelBase;
// Check if this node has already been visisted
if (!visitedNodes.Contains(nodeVM))
{
// Add this node to our two holder collections
rootNodes.Add(nodeVM);
visitedNodes.Add(nodeVM);
}
}
// Remove the current node since it has been processed
nodeVMs.Remove(rootNodes[currentNodeIndex]);
rootNodes.RemoveAt(currentNodeIndex);
}
return(partitionNode);
}
public ICollection<Point> CalculateConvexHullForCluster(PartitionNode pn)
{
double padding = 0;
List<Point> points = new List<Point>();
foreach (NodeViewModelBase nodeVM in pn.Nodes)
{
points.Add(new Point(nodeVM.Position.X - nodeVM.Width / 2 - padding, nodeVM.Position.Y - nodeVM.Height / 2 - padding));
points.Add(new Point(nodeVM.Position.X - nodeVM.Width / 2 - padding, nodeVM.Position.Y + nodeVM.Height / 2 + padding));
points.Add(new Point(nodeVM.Position.X + nodeVM.Width / 2 + padding, nodeVM.Position.Y + nodeVM.Height / 2 + padding));
points.Add(new Point(nodeVM.Position.X + nodeVM.Width / 2 + padding, nodeVM.Position.Y - nodeVM.Height / 2 - padding));
}
return ConvexHull.CalculateConvexHull(points);
}
private static object[] GetPartitionNodeDimensionAndPosition(GraphMapData graphMapData, PartitionNode partitionNode)
{
Point topLeft = new Point(double.MaxValue, double.MaxValue);
Point bottomRight = new Point(double.MinValue, double.MinValue);
// Loop through all node view models to get the bounding area
foreach (NodeViewModelBase nodeViewModelBase in partitionNode.Nodes)
{
NodeMapData nodeMapData = graphMapData.Nodes[nodeViewModelBase.ParentNode.ID];
topLeft.X = Math.Min(topLeft.X, nodeMapData.Position.X - nodeMapData.Dimension.Width / 2D);
topLeft.Y = Math.Min(topLeft.Y, nodeMapData.Position.Y - nodeMapData.Dimension.Height / 2D);
bottomRight.X = Math.Max(bottomRight.X, nodeMapData.Position.X + nodeMapData.Dimension.Width / 2D);
bottomRight.Y = Math.Max(bottomRight.Y, nodeMapData.Position.Y + nodeMapData.Dimension.Height / 2D);
}
// Set the new dimensions based on the calculation performed
double width = Math.Max(bottomRight.X - topLeft.X, 1D);
double height = Math.Max(bottomRight.Y - topLeft.Y, 1D);
Size dimension = new Size(width, height);
// get the center of the partitionNode
Point position = new Point(topLeft.X + width / 2D, topLeft.Y + height / 2D);
object[] result = new object[] { dimension, position };
return result;
}
/// <summary>
/// Returns a PartitionNode instance for the next connected
/// component contained in the provided list. The collection
/// provided is altered and should not be changed between calls
/// to this method.
/// </summary>
/// <param name="nodeVMs">The collection of node view models to be processed</param>
/// <param name="partitionGraphScope">The scope for the paritioned graph</param>
/// <param name="originalScope">The scope for the original graph</param>
/// <returns>a PartitionNode containing a set of connected nodes</returns>
private PartitionNode GetNextConnectedComponent(IList<NodeViewModelBase> nodeVMs, string scope)
{
// Make sure node view models were provided
if (nodeVMs.Count == 0) return null;
// Create a new partition node to hold these components
PartitionNode partitionNode = new PartitionNode(scope, "PN-" + nodeVMs.Count);
// Start at the first nodeVMs
List<NodeViewModelBase> visitedNodes = new List<NodeViewModelBase>();
List<NodeViewModelBase> rootNodes = new List<NodeViewModelBase>();
// Add the first node view model to the root and visited lists
rootNodes.Add(nodeVMs[0]);
visitedNodes.Add(nodeVMs[0]);
// Itterate over the root nodes
while (rootNodes.Count > 0)
{
int currentNodeIndex = 0;
// Add the current node view model to the
// current PartitionNode
partitionNode.AddNode(rootNodes[currentNodeIndex]);
// Itterate over the node's neighbors
foreach (Model.INode node in GetGraphComponents(rootNodes[currentNodeIndex].Scope).Data.Neighbors(rootNodes[currentNodeIndex].ParentNode))
{
// Get the nodeVM for this node
NodeViewModelBase nodeVM = GetGraphComponents(rootNodes[currentNodeIndex].Scope).GetNodeViewModel(node) as NodeViewModelBase;
// Check if this node has already been visisted
if (!visitedNodes.Contains(nodeVM))
{
// Add this node to our two holder collections
rootNodes.Add(nodeVM);
visitedNodes.Add(nodeVM);
}
}
// Remove the current node since it has been processed
nodeVMs.Remove(rootNodes[currentNodeIndex]);
rootNodes.RemoveAt(currentNodeIndex);
}
return partitionNode;
}
/// <summary>
/// Creates the polygons that represent the highlights for clustered data
/// </summary>
/// <param name="pn">The partition node containing nodes in the cluster</param>
/// <returns>The polygon created for the highlight</returns>
private Polygon CreateHighlightPolygon(PartitionNode pn)
{
PointCollection convexHull = ConvertListOfPointsToPointCollection(_cluster.CalculateConvexHullForCluster(pn));
return DrawHighlightPolygon(convexHull);
}
/// <summary>
///
/// </summary>
/// <param name="initialNode"></param>
/// <returns></returns>
private PartitionNode GetClusterAsPartitionNode(INodeShape initialNode)
{
// Determine if the provided node is already
// stored in our internal collection. If it
// is, return it.
if (_nodeToPartition.ContainsKey(initialNode))
return _nodeToPartition[initialNode];
PartitionNode pn = new PartitionNode(_sourceGraph.Scope, "Partition" + (_currentId++).ToString());
_partitionNodes.Add(pn);
Dictionary<INodeShape, bool> nodesInCluster = new Dictionary<INodeShape, bool>();
Queue<INodeShape> nodesToTriangulate = new Queue<INodeShape>();
nodesInCluster[initialNode] = true;
nodesToTriangulate.Enqueue(initialNode);
while (nodesToTriangulate.Count > 0)
{
List<INodeShape> tempList = FindTrianglesToAdd(nodesToTriangulate.Dequeue(), nodesInCluster);
foreach (INodeShape nodeVM in tempList)
{
// Add the node view model to our queue
nodesToTriangulate.Enqueue(nodeVM);
}
}
// Loop over all the node view models in the dictionary
foreach (NodeViewModelBase nodeVM in nodesInCluster.Keys)
{
// Add the node to the partition
pn.AddNode(nodeVM);
// Save the updated partition node
_nodeToPartition[nodeVM] = pn;
}
return pn;
}