VTK
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#include <vtkSpanTreeLayoutStrategy.h>
Public Types | |
typedef vtkGraphLayoutStrategy | Superclass |
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typedef vtkObject | Superclass |
Public Member Functions | |
virtual int | IsA (const char *type) |
vtkSpanTreeLayoutStrategy * | NewInstance () const |
void | PrintSelf (ostream &os, vtkIndent indent) |
void | Layout () |
virtual void | SetDepthFirstSpanningTree (bool) |
virtual bool | GetDepthFirstSpanningTree () |
virtual void | DepthFirstSpanningTreeOn () |
virtual void | DepthFirstSpanningTreeOff () |
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vtkGraphLayoutStrategy * | NewInstance () const |
void | PrintSelf (ostream &os, vtkIndent indent) |
virtual void | SetGraph (vtkGraph *graph) |
virtual void | Initialize () |
virtual int | IsLayoutComplete () |
virtual void | SetWeightEdges (bool state) |
virtual bool | GetWeightEdges () |
virtual void | SetEdgeWeightField (const char *field) |
virtual char * | GetEdgeWeightField () |
Static Public Member Functions | |
static vtkSpanTreeLayoutStrategy * | New () |
static int | IsTypeOf (const char *type) |
static vtkSpanTreeLayoutStrategy * | SafeDownCast (vtkObjectBase *o) |
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static int | IsTypeOf (const char *type) |
static vtkGraphLayoutStrategy * | SafeDownCast (vtkObjectBase *o) |
Protected Member Functions | |
virtual vtkObjectBase * | NewInstanceInternal () const |
vtkSpanTreeLayoutStrategy () | |
~vtkSpanTreeLayoutStrategy () | |
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vtkGraphLayoutStrategy () | |
~vtkGraphLayoutStrategy () | |
Protected Attributes | |
vtkGraphLayoutStrategy * | TreeLayout |
bool | DepthFirstSpanningTree |
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vtkGraph * | Graph |
char * | EdgeWeightField |
bool | WeightEdges |
vtkSpanTreeLayout is a strategy for drawing directed graphs that works by first extracting a spanning tree (more accurately, a spanning forest), and using this both to position graph vertices and to plan the placement of non-tree edges. The latter are drawn with the aid of edge points to produce a tidy drawing.
The approach is best suited to "quasi-trees", graphs where the number of edges is of the same order as the number of nodes; it is less well suited to denser graphs. The boolean flag DepthFirstSpanningTree determines whether a depth-first or breadth-first strategy is used to construct the underlying forest, and the choice of strategy affects the output layout significantly. Informal experiments suggest that the breadth-first strategy is better for denser graphs.
Different layouts could also be produced by plugging in alternative tree layout strategies. To work with the method of routing non-tree edges, any strategy should draw a tree so that levels are equally spaced along the z-axis, precluding for example the use of a radial or balloon layout.
vtkSpanTreeLayout is based on an approach to 3D graph layout first developed as part of the "tulip" tool by Dr. David Auber at LaBRI, U.Bordeaux: see www.tulip-software.org
This implementation departs from the original version in that: (a) it is reconstructed to use Titan/VTK data structures; (b) it uses a faster method for dealing with non-tree edges, requiring at most two edge points per edge (c) allows for plugging in different tree layout methods (d) allows selection of two different strategies for building the underlying layout tree, which can yield significantly different results depending on the data.
Definition at line 70 of file vtkSpanTreeLayoutStrategy.h.
Definition at line 75 of file vtkSpanTreeLayoutStrategy.h.
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Reimplemented from vtkGraphLayoutStrategy.
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Reimplemented from vtkGraphLayoutStrategy.
vtkSpanTreeLayoutStrategy* vtkSpanTreeLayoutStrategy::NewInstance | ( | ) | const |
void vtkSpanTreeLayoutStrategy::PrintSelf | ( | ostream & | os, |
vtkIndent | indent | ||
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If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree. Switching between DFT and BFT may significantly change the layout, and choice must be made on a per-graph basis. Default value is off.
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If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree. Switching between DFT and BFT may significantly change the layout, and choice must be made on a per-graph basis. Default value is off.
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If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree. Switching between DFT and BFT may significantly change the layout, and choice must be made on a per-graph basis. Default value is off.
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If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree. Switching between DFT and BFT may significantly change the layout, and choice must be made on a per-graph basis. Default value is off.
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Perform the layout.
Implements vtkGraphLayoutStrategy.
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Definition at line 95 of file vtkSpanTreeLayoutStrategy.h.
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Definition at line 96 of file vtkSpanTreeLayoutStrategy.h.