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vtkSpanTreeLayoutStrategy Class Reference

#include <vtkSpanTreeLayoutStrategy.h>

Inheritance diagram for vtkSpanTreeLayoutStrategy:
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Collaboration diagram for vtkSpanTreeLayoutStrategy:
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Public Types

typedef vtkGraphLayoutStrategy Superclass
 
- Public Types inherited from vtkGraphLayoutStrategy
typedef vtkObject Superclass
 
- Public Types inherited from vtkObject
typedef vtkObjectBase Superclass
 

Public Member Functions

virtual int IsA (const char *type)
 
vtkSpanTreeLayoutStrategyNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent)
 
void Layout ()
 
virtual void SetDepthFirstSpanningTree (bool)
 
virtual bool GetDepthFirstSpanningTree ()
 
virtual void DepthFirstSpanningTreeOn ()
 
virtual void DepthFirstSpanningTreeOff ()
 
- Public Member Functions inherited from vtkGraphLayoutStrategy
vtkGraphLayoutStrategyNewInstance () const
 
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 ()
 
- Public Member Functions inherited from vtkObject
vtkObjectNewInstance () const
 
virtual void DebugOn ()
 
virtual void DebugOff ()
 
bool GetDebug ()
 
void SetDebug (bool debugFlag)
 
virtual void Modified ()
 
virtual unsigned long GetMTime ()
 
unsigned long AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
 
unsigned long AddObserver (const char *event, vtkCommand *, float priority=0.0f)
 
vtkCommandGetCommand (unsigned long tag)
 
void RemoveObserver (vtkCommand *)
 
void RemoveObservers (unsigned long event, vtkCommand *)
 
void RemoveObservers (const char *event, vtkCommand *)
 
int HasObserver (unsigned long event, vtkCommand *)
 
int HasObserver (const char *event, vtkCommand *)
 
void RemoveObserver (unsigned long tag)
 
void RemoveObservers (unsigned long event)
 
void RemoveObservers (const char *event)
 
void RemoveAllObservers ()
 
int HasObserver (unsigned long event)
 
int HasObserver (const char *event)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, bool(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 
int InvokeEvent (unsigned long event, void *callData)
 
int InvokeEvent (const char *event, void *callData)
 
int InvokeEvent (unsigned long event)
 
int InvokeEvent (const char *event)
 
- Public Member Functions inherited from vtkObjectBase
const char * GetClassName () const
 
virtual void Delete ()
 
virtual void FastDelete ()
 
void Print (ostream &os)
 
virtual void Register (vtkObjectBase *o)
 
virtual void UnRegister (vtkObjectBase *o)
 
void SetReferenceCount (int)
 
void PrintRevisions (ostream &)
 
virtual void PrintHeader (ostream &os, vtkIndent indent)
 
virtual void PrintTrailer (ostream &os, vtkIndent indent)
 
int GetReferenceCount ()
 

Static Public Member Functions

static vtkSpanTreeLayoutStrategyNew ()
 
static int IsTypeOf (const char *type)
 
static vtkSpanTreeLayoutStrategySafeDownCast (vtkObjectBase *o)
 
- Static Public Member Functions inherited from vtkGraphLayoutStrategy
static int IsTypeOf (const char *type)
 
static vtkGraphLayoutStrategySafeDownCast (vtkObjectBase *o)
 
- Static Public Member Functions inherited from vtkObject
static int IsTypeOf (const char *type)
 
static vtkObjectSafeDownCast (vtkObjectBase *o)
 
static vtkObjectNew ()
 
static void BreakOnError ()
 
static void SetGlobalWarningDisplay (int val)
 
static void GlobalWarningDisplayOn ()
 
static void GlobalWarningDisplayOff ()
 
static int GetGlobalWarningDisplay ()
 
- Static Public Member Functions inherited from vtkObjectBase
static int IsTypeOf (const char *name)
 
static vtkObjectBaseNew ()
 

Protected Member Functions

virtual vtkObjectBaseNewInstanceInternal () const
 
 vtkSpanTreeLayoutStrategy ()
 
 ~vtkSpanTreeLayoutStrategy ()
 
- Protected Member Functions inherited from vtkGraphLayoutStrategy
 vtkGraphLayoutStrategy ()
 
 ~vtkGraphLayoutStrategy ()
 
- Protected Member Functions inherited from vtkObject
 vtkObject ()
 
virtual ~vtkObject ()
 
virtual void RegisterInternal (vtkObjectBase *, int check)
 
virtual void UnRegisterInternal (vtkObjectBase *, int check)
 
void InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=NULL)
 
void InternalReleaseFocus ()
 
- Protected Member Functions inherited from vtkObjectBase
 vtkObjectBase ()
 
virtual ~vtkObjectBase ()
 
virtual void CollectRevisions (ostream &)
 
virtual void ReportReferences (vtkGarbageCollector *)
 
 vtkObjectBase (const vtkObjectBase &)
 
void operator= (const vtkObjectBase &)
 

Protected Attributes

vtkGraphLayoutStrategyTreeLayout
 
bool DepthFirstSpanningTree
 
- Protected Attributes inherited from vtkGraphLayoutStrategy
vtkGraphGraph
 
char * EdgeWeightField
 
bool WeightEdges
 
- Protected Attributes inherited from vtkObject
bool Debug
 
vtkTimeStamp MTime
 
vtkSubjectHelper * SubjectHelper
 
- Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32 ReferenceCount
 
vtkWeakPointerBase ** WeakPointers
 

Detailed Description

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.

Thanks:
Thanks to David Duke from the University of Leeds for providing this implementation.
Examples:
vtkSpanTreeLayoutStrategy (Examples)

Definition at line 70 of file vtkSpanTreeLayoutStrategy.h.

Member Typedef Documentation

Definition at line 75 of file vtkSpanTreeLayoutStrategy.h.

Constructor & Destructor Documentation

vtkSpanTreeLayoutStrategy::vtkSpanTreeLayoutStrategy ( )
protected
vtkSpanTreeLayoutStrategy::~vtkSpanTreeLayoutStrategy ( )
protected

Member Function Documentation

static vtkSpanTreeLayoutStrategy* vtkSpanTreeLayoutStrategy::New ( )
static
static int vtkSpanTreeLayoutStrategy::IsTypeOf ( const char *  type)
static
virtual int vtkSpanTreeLayoutStrategy::IsA ( const char *  name)
virtual

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkGraphLayoutStrategy.

static vtkSpanTreeLayoutStrategy* vtkSpanTreeLayoutStrategy::SafeDownCast ( vtkObjectBase o)
static
virtual vtkObjectBase* vtkSpanTreeLayoutStrategy::NewInstanceInternal ( ) const
protectedvirtual

Reimplemented from vtkGraphLayoutStrategy.

vtkSpanTreeLayoutStrategy* vtkSpanTreeLayoutStrategy::NewInstance ( ) const
void vtkSpanTreeLayoutStrategy::PrintSelf ( ostream &  os,
vtkIndent  indent 
)
virtual

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkGraphLayoutStrategy.

virtual void vtkSpanTreeLayoutStrategy::SetDepthFirstSpanningTree ( bool  )
virtual

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.

virtual bool vtkSpanTreeLayoutStrategy::GetDepthFirstSpanningTree ( )
virtual

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.

virtual void vtkSpanTreeLayoutStrategy::DepthFirstSpanningTreeOn ( )
virtual

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.

virtual void vtkSpanTreeLayoutStrategy::DepthFirstSpanningTreeOff ( )
virtual

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.

void vtkSpanTreeLayoutStrategy::Layout ( )
virtual

Perform the layout.

Implements vtkGraphLayoutStrategy.

Member Data Documentation

vtkGraphLayoutStrategy* vtkSpanTreeLayoutStrategy::TreeLayout
protected

Definition at line 95 of file vtkSpanTreeLayoutStrategy.h.

bool vtkSpanTreeLayoutStrategy::DepthFirstSpanningTree
protected

Definition at line 96 of file vtkSpanTreeLayoutStrategy.h.


The documentation for this class was generated from the following file: