VTK  9.1.0
Public Types | Public Member Functions | Static Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
vtkSpanTreeLayoutStrategy Class Reference

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. More...

#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 Member Functions

virtual vtkTypeBool IsA (const char *type)
 Return 1 if this class is the same type of (or a subclass of) the named class.
 
vtkSpanTreeLayoutStrategyNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses.
 
void Layout () override
 Perform the layout.
 
virtual void SetDepthFirstSpanningTree (bool)
 If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree.
 
virtual bool GetDepthFirstSpanningTree ()
 If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree.
 
virtual void DepthFirstSpanningTreeOn ()
 If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree.
 
virtual void DepthFirstSpanningTreeOff ()
 If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree.
 
- Public Member Functions inherited from vtkGraphLayoutStrategy
virtual vtkTypeBool IsA (const char *type)
 Return 1 if this class is the same type of (or a subclass of) the named class.
 
vtkGraphLayoutStrategyNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses.
 
virtual void SetGraph (vtkGraph *graph)
 Setting the graph for the layout strategy.
 
virtual void Initialize ()
 This method allows the layout strategy to do initialization of data structures or whatever else it might want to do.
 
virtual void Layout ()=0
 This is the layout method where the graph that was set in SetGraph() is laid out.
 
virtual int IsLayoutComplete ()
 If your concrete class is iterative than you should overload IsLayoutComplete() otherwise it simply returns 1 by default;.
 
virtual void SetWeightEdges (bool state)
 Whether to use edge weights in the layout or not.
 
virtual bool GetWeightEdges ()
 Whether to use edge weights in the layout or not.
 
virtual void SetEdgeWeightField (const char *field)
 Set/Get the field to use for the edge weights.
 
virtual char * GetEdgeWeightField ()
 Set/Get the field to use for the edge weights.
 
- Public Member Functions inherited from vtkObject
 vtkBaseTypeMacro (vtkObject, vtkObjectBase)
 
virtual void DebugOn ()
 Turn debugging output on.
 
virtual void DebugOff ()
 Turn debugging output off.
 
bool GetDebug ()
 Get the value of the debug flag.
 
void SetDebug (bool debugFlag)
 Set the value of the debug flag.
 
virtual void Modified ()
 Update the modification time for this object.
 
virtual vtkMTimeType GetMTime ()
 Return this object's modified time.
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses.
 
void RemoveObserver (unsigned long tag)
 
void RemoveObservers (unsigned long event)
 
void RemoveObservers (const char *event)
 
void RemoveAllObservers ()
 
vtkTypeBool HasObserver (unsigned long event)
 
vtkTypeBool HasObserver (const char *event)
 
int InvokeEvent (unsigned long event)
 
int InvokeEvent (const char *event)
 
unsigned long AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object.
 
unsigned long AddObserver (const char *event, vtkCommand *, float priority=0.0f)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object.
 
vtkCommandGetCommand (unsigned long tag)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object.
 
void RemoveObserver (vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object.
 
void RemoveObservers (unsigned long event, vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object.
 
void RemoveObservers (const char *event, vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object.
 
vtkTypeBool HasObserver (unsigned long event, vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object.
 
vtkTypeBool HasObserver (const char *event, vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object.
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
 Overloads to AddObserver that allow developers to add class member functions as callbacks for events.
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 Overloads to AddObserver that allow developers to add class member functions as callbacks for events.
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, bool(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 Allow user to set the AbortFlagOn() with the return value of the callback method.
 
int InvokeEvent (unsigned long event, void *callData)
 This method invokes an event and return whether the event was aborted or not.
 
int InvokeEvent (const char *event, void *callData)
 This method invokes an event and return whether the event was aborted or not.
 
- Public Member Functions inherited from vtkObjectBase
const char * GetClassName () const
 Return the class name as a string.
 
virtual vtkTypeBool IsA (const char *name)
 Return 1 if this class is the same type of (or a subclass of) the named class.
 
virtual vtkIdType GetNumberOfGenerationsFromBase (const char *name)
 Given the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class).
 
virtual void Delete ()
 Delete a VTK object.
 
virtual void FastDelete ()
 Delete a reference to this object.
 
void InitializeObjectBase ()
 
void Print (ostream &os)
 Print an object to an ostream.
 
virtual void Register (vtkObjectBase *o)
 Increase the reference count (mark as used by another object).
 
virtual void UnRegister (vtkObjectBase *o)
 Decrease the reference count (release by another object).
 
int GetReferenceCount ()
 Return the current reference count of this object.
 
void SetReferenceCount (int)
 Sets the reference count.
 
bool GetIsInMemkind () const
 A local state flag that remembers whether this object lives in the normal or extended memory space.
 
virtual void PrintHeader (ostream &os, vtkIndent indent)
 Methods invoked by print to print information about the object including superclasses.
 
virtual void PrintTrailer (ostream &os, vtkIndent indent)
 Methods invoked by print to print information about the object including superclasses.
 

Static Public Member Functions

static vtkSpanTreeLayoutStrategyNew ()
 
static vtkTypeBool IsTypeOf (const char *type)
 
static vtkSpanTreeLayoutStrategySafeDownCast (vtkObjectBase *o)
 
- Static Public Member Functions inherited from vtkGraphLayoutStrategy
static vtkTypeBool IsTypeOf (const char *type)
 
static vtkGraphLayoutStrategySafeDownCast (vtkObjectBase *o)
 
- Static Public Member Functions inherited from vtkObject
static vtkObjectNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
 
static void BreakOnError ()
 This method is called when vtkErrorMacro executes.
 
static void SetGlobalWarningDisplay (int val)
 This is a global flag that controls whether any debug, warning or error messages are displayed.
 
static void GlobalWarningDisplayOn ()
 This is a global flag that controls whether any debug, warning or error messages are displayed.
 
static void GlobalWarningDisplayOff ()
 This is a global flag that controls whether any debug, warning or error messages are displayed.
 
static int GetGlobalWarningDisplay ()
 This is a global flag that controls whether any debug, warning or error messages are displayed.
 
- Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool IsTypeOf (const char *name)
 Return 1 if this class type is the same type of (or a subclass of) the named class.
 
static vtkIdType GetNumberOfGenerationsFromBaseType (const char *name)
 Given a the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class).
 
static vtkObjectBaseNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
 
static void SetMemkindDirectory (const char *directoryname)
 The name of a directory, ideally mounted -o dax, to memory map an extended memory space within.
 
static bool GetUsingMemkind ()
 A global state flag that controls whether vtkObjects are constructed in the usual way (the default) or within the extended memory space.
 

Protected Member Functions

virtual vtkObjectBaseNewInstanceInternal () const
 
 vtkSpanTreeLayoutStrategy ()
 
 ~vtkSpanTreeLayoutStrategy () override
 
- Protected Member Functions inherited from vtkGraphLayoutStrategy
virtual vtkObjectBaseNewInstanceInternal () const
 
 vtkGraphLayoutStrategy ()
 
 ~vtkGraphLayoutStrategy () override
 
- Protected Member Functions inherited from vtkObject
 vtkObject ()
 
 ~vtkObject () override
 
void RegisterInternal (vtkObjectBase *, vtkTypeBool check) override
 
void UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override
 
void InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=nullptr)
 These methods allow a command to exclusively grab all events.
 
void InternalReleaseFocus ()
 These methods allow a command to exclusively grab all events.
 
- Protected Member Functions inherited from vtkObjectBase
 vtkObjectBase ()
 
virtual ~vtkObjectBase ()
 
virtual void RegisterInternal (vtkObjectBase *, vtkTypeBool check)
 
virtual void UnRegisterInternal (vtkObjectBase *, vtkTypeBool check)
 
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
std::atomic< int32_t > ReferenceCount
 
vtkWeakPointerBase ** WeakPointers
 

Additional Inherited Members

- Static Protected Member Functions inherited from vtkObjectBase
static vtkMallocingFunction GetCurrentMallocFunction ()
 
static vtkReallocingFunction GetCurrentReallocFunction ()
 
static vtkFreeingFunction GetCurrentFreeFunction ()
 
static vtkFreeingFunction GetAlternateFreeFunction ()
 

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.

Definition at line 68 of file vtkSpanTreeLayoutStrategy.h.

Member Typedef Documentation

◆ Superclass

Definition at line 73 of file vtkSpanTreeLayoutStrategy.h.

Constructor & Destructor Documentation

◆ vtkSpanTreeLayoutStrategy()

vtkSpanTreeLayoutStrategy::vtkSpanTreeLayoutStrategy ( )
protected

◆ ~vtkSpanTreeLayoutStrategy()

vtkSpanTreeLayoutStrategy::~vtkSpanTreeLayoutStrategy ( )
overrideprotected

Member Function Documentation

◆ New()

static vtkSpanTreeLayoutStrategy * vtkSpanTreeLayoutStrategy::New ( )
static

◆ IsTypeOf()

static vtkTypeBool vtkSpanTreeLayoutStrategy::IsTypeOf ( const char *  type)
static

◆ IsA()

virtual vtkTypeBool 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.

◆ SafeDownCast()

static vtkSpanTreeLayoutStrategy * vtkSpanTreeLayoutStrategy::SafeDownCast ( vtkObjectBase o)
static

◆ NewInstanceInternal()

virtual vtkObjectBase * vtkSpanTreeLayoutStrategy::NewInstanceInternal ( ) const
protectedvirtual

Reimplemented from vtkGraphLayoutStrategy.

◆ NewInstance()

vtkSpanTreeLayoutStrategy * vtkSpanTreeLayoutStrategy::NewInstance ( ) const

◆ PrintSelf()

void vtkSpanTreeLayoutStrategy::PrintSelf ( ostream &  os,
vtkIndent  indent 
)
overridevirtual

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.

◆ SetDepthFirstSpanningTree()

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.

◆ GetDepthFirstSpanningTree()

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.

◆ DepthFirstSpanningTreeOn()

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.

◆ DepthFirstSpanningTreeOff()

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.

◆ Layout()

void vtkSpanTreeLayoutStrategy::Layout ( )
overridevirtual

Perform the layout.

Implements vtkGraphLayoutStrategy.

Member Data Documentation

◆ TreeLayout

vtkGraphLayoutStrategy* vtkSpanTreeLayoutStrategy::TreeLayout
protected

Definition at line 98 of file vtkSpanTreeLayoutStrategy.h.

◆ DepthFirstSpanningTree

bool vtkSpanTreeLayoutStrategy::DepthFirstSpanningTree
protected

Definition at line 99 of file vtkSpanTreeLayoutStrategy.h.


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