C# Class Smrf.NodeXL.Layouts.EdgeBundler

EdgeBundler class is intended to be used for bundling and straightening of the edges of the graph. The goal is to get the layout that is less clutered and more suitable for analiyzing. This class is based on the paper "Force-Directed Edge Bundling for Graph Visualization" by Danny Holten and Jarke J. van Wijk. http://www.win.tue.nl/~dholten/papers/forcebundles_eurovis.pdf It was implemented and modified by Luka Potkonjak.

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Public Methods

Method	Description
BundleAllEdges ( IGraph graph, Rectangle rectangle ) : void	Bundles edges of the graph.
BundleEdges ( IGraph graph, IEnumerable edges, Rectangle rectangle ) : void	Bundles specified edges. Shapes of all the other edges remain the same, so this method is faster than the one for bundling all edges, but also produces less optimal layout.
StraightenEdges ( IGraph graph, float s ) : void	Moves the control points of all the edges of the graph closer to their original position on the straight edge

Private Methods

Method	Description
AddAllExistingData ( IEdgeCollection edges ) : void	Collects edge data from all edges in the specified collection. Used for edges that already have control points metadata.
AddDataForAllEdges ( IEdgeCollection edges ) : void	Collects edge data from all edges in the specified collection. Used by the BundleAllEdges method.
AddEdgeData ( IEdge e ) : void	Collects data from the specified edge
AddEdgeDataForMovedEdges ( IEnumerable edges ) : void	Collects edge data from the specified edges
AddExistingData ( IEdge e ) : void	Collects data from the specified edge. Used for edges that already have control points metadata.
AngleCompatibility ( EdgeGroupData ed1, EdgeGroupData ed2 ) : float	Calculates angle compatibility of the two edges
CalculateCompatibility ( EdgeGroupData ed1, EdgeGroupData ed2 ) : float	Calculates compatibility of the two edges. Combines angle, position, scale, and visibility compatibility coefficient.
CalculateDirectedness ( EdgeGroupData ed1, EdgeGroupData ed2 ) : bool	Calculates directedness of the two edges.
CalculateNewControlPoints ( Object o ) : void	Calculates new positions for the control points of an edge by applying elastic and electrostatic forces to them
DivideAllEdges ( int subdivisionPointsNum ) : void	Divides edges into segments by adding subdivision points to them
DivideEdge ( EdgeGroupData ed, int subdivisionPointsNum ) : void	Divides an edge into segments by adding subdivision points to it
DoubleSubdivisionPoints ( EdgeGroupData ed ) : void	Doubles subdivision points for an edge by adding one new subdivision point between each two
DoubleSubdivisionPointsForAllEdges ( ) : void	Doubles subdivision points for all edges
FindCompatibleEdges ( EdgeGroupData>.Dictionary edgeSet ) : void	Finds compatible edges for the specified set of edges
Intersects ( PointF p1, PointF p2, PointF q1, PointF q2, PointF &intersection, float &rp ) : bool	Finds an intersection point of the two lines
MoveControlPoints ( EdgeGroupData>.Dictionary groupsToMove ) : void	Moves control points for the specified edges
PositionCompatibility ( EdgeGroupData ed1, EdgeGroupData ed2 ) : float	Calculates position compatibility of the two edges
ResetMovedEdges ( ) : void	Straightens moved edges.
ScaleCompatibility ( EdgeGroupData ed1, EdgeGroupData ed2 ) : float	Calculates scale compatibility of the two edges
StraightenEdgesInternally ( EdgeGroupData>.Dictionary groupsToStraighten, float s ) : void	Straightens the edges using internal data sturctures
VisibilityCoefficient ( EdgeGroupData ed1, EdgeGroupData ed2 ) : float	Calculates visibility coefficient of the two edges.
VisibilityCompatibility ( EdgeGroupData ed1, EdgeGroupData ed2 ) : float	Calculates visibility compatibility of the two edges. Uses lower of the two calculated visibility coefficients.

Method Details

BundleAllEdges() public method

Bundles edges of the graph.

public BundleAllEdges ( IGraph graph, Rectangle rectangle ) : void
graph	IGraph	/// Graph whose edges should be bundled ///
rectangle	System.Drawing.Rectangle	/// Rectangle in which the graph is laid out. /// Control points of bundled edges should not fall outside of this rectangle. ///
return	void

BundleEdges() public method

Bundles specified edges. Shapes of all the other edges remain the same, so this method is faster than the one for bundling all edges, but also produces less optimal layout.

public BundleEdges ( IGraph graph, IEnumerable edges, Rectangle rectangle ) : void
graph	IGraph	/// Parent graph of the edge set ///
edges	IEnumerable	/// Edges that should be bundled ///
rectangle	System.Drawing.Rectangle	/// Rectangle in which the graph is laid out. /// Control points of bundled edges should not fall outside of this rectangle. ///
return	void

StraightenEdges() public method

Moves the control points of all the edges of the graph closer to their original position on the straight edge

public StraightenEdges ( IGraph graph, float s ) : void
graph	IGraph	/// Graph whose edges should be straightened ///
s	float	/// Specifies the amount of straightening, from 0 to 1 ///
return	void