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.
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| virtual vtkTypeBool | IsA (const char *type) |
| | Return 1 if this class is the same type of (or a subclass of) the named class.
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| vtkSpanTreeLayoutStrategy * | NewInstance () const |
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| void | PrintSelf (ostream &os, vtkIndent indent) override |
| | Methods invoked by print to print information about the object including superclasses.
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| void | Layout () override |
| | Perform the layout.
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| virtual void | SetDepthFirstSpanningTree (bool) |
| | If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree.
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| virtual bool | GetDepthFirstSpanningTree () |
| | If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree.
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| virtual void | DepthFirstSpanningTreeOn () |
| | If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree.
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| virtual void | DepthFirstSpanningTreeOff () |
| | If set, base the layout on a depth-first spanning tree, rather than the default breadth-first spanning tree.
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| virtual vtkTypeBool | IsA (const char *type) |
| | Return 1 if this class is the same type of (or a subclass of) the named class.
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| vtkGraphLayoutStrategy * | NewInstance () const |
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| void | PrintSelf (ostream &os, vtkIndent indent) override |
| | Methods invoked by print to print information about the object including superclasses.
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| virtual void | SetGraph (vtkGraph *graph) |
| | Setting the graph for the layout strategy.
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| virtual void | Initialize () |
| | This method allows the layout strategy to do initialization of data structures or whatever else it might want to do.
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| virtual void | Layout ()=0 |
| | This is the layout method where the graph that was set in SetGraph() is laid out.
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| virtual int | IsLayoutComplete () |
| | If your concrete class is iterative than you should overload IsLayoutComplete() otherwise it simply returns 1 by default;.
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| virtual void | SetWeightEdges (bool state) |
| | Whether to use edge weights in the layout or not.
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| virtual bool | GetWeightEdges () |
| | Whether to use edge weights in the layout or not.
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| virtual void | SetEdgeWeightField (const char *field) |
| | Set/Get the field to use for the edge weights.
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| virtual char * | GetEdgeWeightField () |
| | Set/Get the field to use for the edge weights.
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| | vtkBaseTypeMacro (vtkObject, vtkObjectBase) |
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| virtual void | DebugOn () |
| | Turn debugging output on.
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| virtual void | DebugOff () |
| | Turn debugging output off.
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| bool | GetDebug () |
| | Get the value of the debug flag.
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| void | SetDebug (bool debugFlag) |
| | Set the value of the debug flag.
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| virtual void | Modified () |
| | Update the modification time for this object.
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| virtual vtkMTimeType | GetMTime () |
| | Return this object's modified time.
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| void | PrintSelf (ostream &os, vtkIndent indent) override |
| | Methods invoked by print to print information about the object including superclasses.
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| void | RemoveObserver (unsigned long tag) |
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| void | RemoveObservers (unsigned long event) |
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| void | RemoveObservers (const char *event) |
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| void | RemoveAllObservers () |
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| vtkTypeBool | HasObserver (unsigned long event) |
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| vtkTypeBool | HasObserver (const char *event) |
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| vtkTypeBool | InvokeEvent (unsigned long event) |
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| vtkTypeBool | InvokeEvent (const char *event) |
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| std::string | GetObjectDescription () const override |
| | The object description printed in messages and PrintSelf output.
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| unsigned long | AddObserver (unsigned long event, vtkCommand *, float priority=0.0f) |
| | Allow people to add/remove/invoke observers (callbacks) to any VTK object.
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| unsigned long | AddObserver (const char *event, vtkCommand *, float priority=0.0f) |
| | Allow people to add/remove/invoke observers (callbacks) to any VTK object.
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| vtkCommand * | GetCommand (unsigned long tag) |
| | Allow people to add/remove/invoke observers (callbacks) to any VTK object.
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| void | RemoveObserver (vtkCommand *) |
| | Allow people to add/remove/invoke observers (callbacks) to any VTK object.
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| void | RemoveObservers (unsigned long event, vtkCommand *) |
| | Allow people to add/remove/invoke observers (callbacks) to any VTK object.
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| void | RemoveObservers (const char *event, vtkCommand *) |
| | Allow people to add/remove/invoke observers (callbacks) to any VTK object.
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| vtkTypeBool | HasObserver (unsigned long event, vtkCommand *) |
| | Allow people to add/remove/invoke observers (callbacks) to any VTK object.
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| vtkTypeBool | HasObserver (const char *event, vtkCommand *) |
| | Allow people to add/remove/invoke observers (callbacks) to any VTK object.
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| 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.
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| 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.
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| 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.
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| vtkTypeBool | InvokeEvent (unsigned long event, void *callData) |
| | This method invokes an event and return whether the event was aborted or not.
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| vtkTypeBool | InvokeEvent (const char *event, void *callData) |
| | This method invokes an event and return whether the event was aborted or not.
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| virtual void | SetObjectName (const std::string &objectName) |
| | Set/get the name of this object for reporting purposes.
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| virtual std::string | GetObjectName () const |
| | Set/get the name of this object for reporting purposes.
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| const char * | GetClassName () const |
| | Return the class name as a string.
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| virtual std::string | GetObjectDescription () const |
| | The object description printed in messages and PrintSelf output.
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| virtual vtkTypeBool | IsA (const char *name) |
| | Return 1 if this class is the same type of (or a subclass of) the named class.
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| 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).
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| virtual void | Delete () |
| | Delete a VTK object.
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| virtual void | FastDelete () |
| | Delete a reference to this object.
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| void | InitializeObjectBase () |
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| void | Print (ostream &os) |
| | Print an object to an ostream.
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| void | Register (vtkObjectBase *o) |
| | Increase the reference count (mark as used by another object).
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| virtual void | UnRegister (vtkObjectBase *o) |
| | Decrease the reference count (release by another object).
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| int | GetReferenceCount () |
| | Return the current reference count of this object.
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| void | SetReferenceCount (int) |
| | Sets the reference count.
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| bool | GetIsInMemkind () const |
| | A local state flag that remembers whether this object lives in the normal or extended memory space.
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| virtual void | PrintHeader (ostream &os, vtkIndent indent) |
| | Methods invoked by print to print information about the object including superclasses.
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| virtual void | PrintTrailer (ostream &os, vtkIndent indent) |
| | Methods invoked by print to print information about the object including superclasses.
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| virtual bool | UsesGarbageCollector () const |
| | Indicate whether the class uses vtkGarbageCollector or not.
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| static vtkSpanTreeLayoutStrategy * | New () |
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| static vtkTypeBool | IsTypeOf (const char *type) |
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| static vtkSpanTreeLayoutStrategy * | SafeDownCast (vtkObjectBase *o) |
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| static vtkTypeBool | IsTypeOf (const char *type) |
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| static vtkGraphLayoutStrategy * | SafeDownCast (vtkObjectBase *o) |
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| static vtkObject * | New () |
| | Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
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| static void | BreakOnError () |
| | This method is called when vtkErrorMacro executes.
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| static void | SetGlobalWarningDisplay (vtkTypeBool val) |
| | This is a global flag that controls whether any debug, warning or error messages are displayed.
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| static void | GlobalWarningDisplayOn () |
| | This is a global flag that controls whether any debug, warning or error messages are displayed.
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| static void | GlobalWarningDisplayOff () |
| | This is a global flag that controls whether any debug, warning or error messages are displayed.
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| static vtkTypeBool | GetGlobalWarningDisplay () |
| | This is a global flag that controls whether any debug, warning or error messages are displayed.
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| static vtkTypeBool | IsTypeOf (const char *name) |
| | Return 1 if this class type is the same type of (or a subclass of) the named class.
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| 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).
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| static vtkObjectBase * | New () |
| | Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
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| static void | SetMemkindDirectory (const char *directoryname) |
| | The name of a directory, ideally mounted -o dax, to memory map an extended memory space within.
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| 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.
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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 52 of file vtkSpanTreeLayoutStrategy.h.
Public Types inherited from vtkGraphLayoutStrategy
1.9.7