vtkSplineWidget Class Reference

#include <vtkSplineWidget.h>

Inheritance diagram for vtkSplineWidget:

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Collaboration diagram for vtkSplineWidget:

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List of all members.

Detailed Description

3D widget for manipulating a spline

This 3D widget defines a spline that can be interactively placed in a scene. The spline has handles, the number of which can be changed, plus it can be picked on the spline itself to translate or rotate it in the scene. A nice feature of the object is that the vtkSplineWidget, like any 3D widget, will work with the current interactor style. That is, if vtkSplineWidget does not handle an event, then all other registered observers (including the interactor style) have an opportunity to process the event. Otherwise, the vtkSplineWidget will terminate the processing of the event that it handles.

To use this object, just invoke SetInteractor() with the argument of the method a vtkRenderWindowInteractor. You may also wish to invoke "PlaceWidget()" to initially position the widget. The interactor will act normally until the "i" key (for "interactor") is pressed, at which point the vtkSplineWidget will appear. (See superclass documentation for information about changing this behavior.) Events that occur outside of the widget (i.e., no part of the widget is picked) are propagated to any other registered obsevers (such as the interaction style). Turn off the widget by pressing the "i" key again (or invoke the Off() method).

The button actions and key modifiers are as follows for controlling the widget: 1) left button down on and drag one of the spherical handles to change the shape of the spline: the handles act as "control points". 2) left button or middle button down on a line segment forming the spline allows uniform translation of the widget. 3) ctrl + middle button down on the widget enables spinning of the widget about its center. 4) right button down on the widget enables scaling of the widget. By moving the mouse "up" the render window the spline will be made bigger; by moving "down" the render window the widget will be made smaller. 5) ctrl key + right button down on any handle will erase it providing there will be two or more points remaining to form a spline. 6) shift key + right button down on any line segment will insert a handle onto the spline at the cursor position.

The vtkSplineWidget has several methods that can be used in conjunction with other VTK objects. The Set/GetResolution() methods control the number of subdivisions of the spline; the GetPolyData() method can be used to get the polygonal representation and can be used for things like seeding streamlines or probing other data sets. Typical usage of the widget is to make use of the StartInteractionEvent, InteractionEvent, and EndInteractionEvent events. The InteractionEvent is called on mouse motion; the other two events are called on button down and button up (either left or right button).

Some additional features of this class include the ability to control the properties of the widget. You can set the properties of the selected and unselected representations of the spline. For example, you can set the property for the handles and spline. In addition there are methods to constrain the spline so that it is aligned with a plane. Note that a simple ruler widget can be derived by setting the resolution to 1, the number of handles to 2, and calling the GetSummedLength method!

Thanks:: Thanks to Dean Inglis for developing and contributing this class.

Warning:: Note that handles and line can be picked even when they are "behind" other actors. This is an intended feature and not a bug.

See also:: vtk3DWidget vtkBoxWidget vtkLineWidget vtkPointWidget vtkSphereWidget vtkImagePlaneWidget vtkImplicitPlaneWidget vtkPlaneWidget

Events:: vtkCommand::DisableEvent vtkCommand::EndInteractionEvent vtkCommand::InteractionEvent vtkCommand::StartInteractionEvent vtkCommand::EnableEvent

Tests:: vtkSplineWidget (Tests)

Definition at line 112 of file vtkSplineWidget.h.


Public Types
typedef vtk3DWidget	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
void	SetPlaneSource (vtkPlaneSource *plane)
virtual void	SetProjectionNormal (int)
virtual int	GetProjectionNormal ()
void	SetProjectionNormalToXAxes ()
void	SetProjectionNormalToYAxes ()
void	SetProjectionNormalToZAxes ()
void	SetProjectionNormalToOblique ()
void	GetPolyData (vtkPolyData *pd)
int	IsClosed ()
double	GetSummedLength ()
void	InitializeHandles (vtkPoints *points)

virtual void	SetEnabled (int)
virtual void	PlaceWidget (double bounds[6])
void	PlaceWidget ()
void	PlaceWidget (double xmin, double xmax, double ymin, double ymax, double zmin, double zmax)

virtual void	SetProjectToPlane (int)
virtual int	GetProjectToPlane ()
virtual void	ProjectToPlaneOn ()
virtual void	ProjectToPlaneOff ()

void	SetProjectionPosition (double position)
virtual double	GetProjectionPosition ()

virtual void	SetHandleProperty (vtkProperty *)
virtual vtkProperty *	GetHandleProperty ()
virtual void	SetSelectedHandleProperty (vtkProperty *)
virtual vtkProperty *	GetSelectedHandleProperty ()

virtual void	SetLineProperty (vtkProperty *)
virtual vtkProperty *	GetLineProperty ()
virtual void	SetSelectedLineProperty (vtkProperty *)
virtual vtkProperty *	GetSelectedLineProperty ()

virtual void	SetNumberOfHandles (int npts)
virtual int	GetNumberOfHandles ()

void	SetResolution (int resolution)
virtual int	GetResolution ()

virtual void	SetParametricSpline (vtkParametricSpline *)
virtual vtkParametricSpline *	GetParametricSpline ()

void	SetHandlePosition (int handle, double x, double y, double z)
void	SetHandlePosition (int handle, double xyz[3])
void	GetHandlePosition (int handle, double xyz[3])
double *	GetHandlePosition (int handle)

void	SetClosed (int closed)
virtual int	GetClosed ()
virtual void	ClosedOn ()
virtual void	ClosedOff ()
Static Public Member Functions
static vtkSplineWidget *	New ()
static int	IsTypeOf (const char *type)
static vtkSplineWidget *	SafeDownCast (vtkObject *o)
Protected Types
enum	WidgetState { Start = 0, Moving, Scaling, Spinning, Inserting, Erasing, Outside }
Protected Member Functions
	vtkSplineWidget ()
	~vtkSplineWidget ()
void	OnLeftButtonDown ()
void	OnLeftButtonUp ()
void	OnMiddleButtonDown ()
void	OnMiddleButtonUp ()
void	OnRightButtonDown ()
void	OnRightButtonUp ()
void	OnMouseMove ()
void	ProjectPointsToPlane ()
void	ProjectPointsToOrthoPlane ()
void	ProjectPointsToObliquePlane ()
void	BuildRepresentation ()
void	HighlightLine (int highlight)
void	Initialize ()
int	HighlightHandle (vtkProp *prop)
virtual void	SizeHandles ()
void	InsertHandleOnLine (double *pos)
void	EraseHandle (const int &)
void	MovePoint (double p1, double p2)
void	Scale (double p1, double p2, int X, int Y)
void	Translate (double p1, double p2)
void	Spin (double p1, double p2, double *vpn)
void	CreateDefaultProperties ()
void	CalculateCentroid ()
Static Protected Member Functions
static void	ProcessEvents (vtkObject object, unsigned long event, void clientdata, void *calldata)
Protected Attributes
int	State
int	ProjectionNormal
double	ProjectionPosition
int	ProjectToPlane
vtkPlaneSource *	PlaneSource
vtkParametricSpline *	ParametricSpline
vtkParametricFunctionSource *	ParametricFunctionSource
int	NumberOfHandles
int	Closed
vtkActor *	LineActor
int	Resolution
vtkActor **	Handle
vtkSphereSource **	HandleGeometry
vtkCellPicker *	HandlePicker
vtkCellPicker *	LinePicker
vtkActor *	CurrentHandle
int	CurrentHandleIndex
vtkTransform *	Transform
vtkProperty *	HandleProperty
vtkProperty *	SelectedHandleProperty
vtkProperty *	LineProperty
vtkProperty *	SelectedLineProperty
double	Centroid [3]

Member Typedef Documentation

typedef vtk3DWidget vtkSplineWidget::Superclass

Reimplemented from vtk3DWidget.

Definition at line 118 of file vtkSplineWidget.h.

Member Enumeration Documentation

enum vtkSplineWidget::WidgetState [protected]

Enumerator:

Start
Moving
Scaling
Spinning
Inserting
Erasing
Outside

Definition at line 262 of file vtkSplineWidget.h.

Constructor & Destructor Documentation

vtkSplineWidget::vtkSplineWidget ( ) [protected]

vtkSplineWidget::~vtkSplineWidget ( ) [protected]

Member Function Documentation

static vtkSplineWidget* vtkSplineWidget::New ( ) [static]

Instantiate the object.

Reimplemented from vtkObject.

virtual const char* vtkSplineWidget::GetClassName ( ) [virtual]

Reimplemented from vtk3DWidget.

static int vtkSplineWidget::IsTypeOf ( const char * name ) [static]

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

Reimplemented from vtk3DWidget.

virtual int vtkSplineWidget::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 vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtk3DWidget.

static vtkSplineWidget* vtkSplineWidget::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtk3DWidget.

void vtkSplineWidget::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 vtk3DWidget.

virtual void vtkSplineWidget::SetEnabled ( int ) [virtual]

Methods that satisfy the superclass' API.

Reimplemented from vtkInteractorObserver.

virtual void vtkSplineWidget::PlaceWidget ( double bounds[6] ) [virtual]

Methods that satisfy the superclass' API.

Implements vtk3DWidget.

void vtkSplineWidget::PlaceWidget ( ) [inline, virtual]

Methods that satisfy the superclass' API.

Reimplemented from vtk3DWidget.

Definition at line 125 of file vtkSplineWidget.h.

void vtkSplineWidget::PlaceWidget	(	double	xmin,
		double	xmax,
		double	ymin,
		double	ymax,
		double	zmin,
		double	zmax
	)			`[inline, virtual]`

Methods that satisfy the superclass' API.

Reimplemented from vtk3DWidget.

Definition at line 127 of file vtkSplineWidget.h.

virtual void vtkSplineWidget::SetProjectToPlane ( int ) [virtual]

Force the spline widget to be projected onto one of the orthogonal planes. Remember that when the state changes, a ModifiedEvent is invoked. This can be used to snap the spline to the plane if it is orginally not aligned. The normal in SetProjectionNormal is 0,1,2 for YZ,XZ,XY planes respectively and 3 for arbitrary oblique planes when the widget is tied to a vtkPlaneSource.

virtual int vtkSplineWidget::GetProjectToPlane ( ) [virtual]

Force the spline widget to be projected onto one of the orthogonal planes. Remember that when the state changes, a ModifiedEvent is invoked. This can be used to snap the spline to the plane if it is orginally not aligned. The normal in SetProjectionNormal is 0,1,2 for YZ,XZ,XY planes respectively and 3 for arbitrary oblique planes when the widget is tied to a vtkPlaneSource.

virtual void vtkSplineWidget::ProjectToPlaneOn ( ) [virtual]

Force the spline widget to be projected onto one of the orthogonal planes. Remember that when the state changes, a ModifiedEvent is invoked. This can be used to snap the spline to the plane if it is orginally not aligned. The normal in SetProjectionNormal is 0,1,2 for YZ,XZ,XY planes respectively and 3 for arbitrary oblique planes when the widget is tied to a vtkPlaneSource.

virtual void vtkSplineWidget::ProjectToPlaneOff ( ) [virtual]

Force the spline widget to be projected onto one of the orthogonal planes. Remember that when the state changes, a ModifiedEvent is invoked. This can be used to snap the spline to the plane if it is orginally not aligned. The normal in SetProjectionNormal is 0,1,2 for YZ,XZ,XY planes respectively and 3 for arbitrary oblique planes when the widget is tied to a vtkPlaneSource.

void vtkSplineWidget::SetPlaneSource ( vtkPlaneSource * plane )

Set up a reference to a vtkPlaneSource that could be from another widget object, e.g. a vtkPolyDataSourceWidget.

virtual void vtkSplineWidget::SetProjectionNormal ( int ) [virtual]

virtual int vtkSplineWidget::GetProjectionNormal ( ) [virtual]

void vtkSplineWidget::SetProjectionNormalToXAxes ( ) [inline]

Definition at line 150 of file vtkSplineWidget.h.

void vtkSplineWidget::SetProjectionNormalToYAxes ( ) [inline]

Definition at line 152 of file vtkSplineWidget.h.

void vtkSplineWidget::SetProjectionNormalToZAxes ( ) [inline]

Definition at line 154 of file vtkSplineWidget.h.

void vtkSplineWidget::SetProjectionNormalToOblique ( ) [inline]

Definition at line 156 of file vtkSplineWidget.h.

void vtkSplineWidget::SetProjectionPosition ( double position )

Set the position of spline handles and points in terms of a plane's position. i.e., if ProjectionNormal is 0, all of the x-coordinate values of the points are set to position. Any value can be passed (and is ignored) to update the spline points when Projection normal is set to 3 for arbritrary plane orientations.

virtual double vtkSplineWidget::GetProjectionPosition ( ) [virtual]

Set the position of spline handles and points in terms of a plane's position. i.e., if ProjectionNormal is 0, all of the x-coordinate values of the points are set to position. Any value can be passed (and is ignored) to update the spline points when Projection normal is set to 3 for arbritrary plane orientations.

void vtkSplineWidget::GetPolyData ( vtkPolyData * pd )

Grab the polydata (including points) that defines the spline. The polydata consists of points and line segments numbering Resolution + 1 and Resoltuion, respectively. Points are guaranteed to be up-to-date when either the InteractionEvent or EndInteraction events are invoked. The user provides the vtkPolyData and the points and polyline are added to it.

virtual void vtkSplineWidget::SetHandleProperty ( vtkProperty * ) [virtual]

Set/Get the handle properties (the spheres are the handles). The properties of the handles when selected and unselected can be manipulated.

virtual vtkProperty* vtkSplineWidget::GetHandleProperty ( ) [virtual]

Set/Get the handle properties (the spheres are the handles). The properties of the handles when selected and unselected can be manipulated.

virtual void vtkSplineWidget::SetSelectedHandleProperty ( vtkProperty * ) [virtual]

Set/Get the handle properties (the spheres are the handles). The properties of the handles when selected and unselected can be manipulated.

virtual vtkProperty* vtkSplineWidget::GetSelectedHandleProperty ( ) [virtual]

Set/Get the handle properties (the spheres are the handles). The properties of the handles when selected and unselected can be manipulated.

virtual void vtkSplineWidget::SetLineProperty ( vtkProperty * ) [virtual]

Set/Get the line properties. The properties of the line when selected and unselected can be manipulated.

virtual vtkProperty* vtkSplineWidget::GetLineProperty ( ) [virtual]

Set/Get the line properties. The properties of the line when selected and unselected can be manipulated.

virtual void vtkSplineWidget::SetSelectedLineProperty ( vtkProperty * ) [virtual]

Set/Get the line properties. The properties of the line when selected and unselected can be manipulated.

virtual vtkProperty* vtkSplineWidget::GetSelectedLineProperty ( ) [virtual]

Set/Get the line properties. The properties of the line when selected and unselected can be manipulated.

virtual void vtkSplineWidget::SetNumberOfHandles ( int npts ) [virtual]

Set/Get the number of handles for this widget.

virtual int vtkSplineWidget::GetNumberOfHandles ( ) [virtual]

Set/Get the number of handles for this widget.

void vtkSplineWidget::SetResolution ( int resolution )

Set/Get the number of line segments representing the spline for this widget.

virtual int vtkSplineWidget::GetResolution ( ) [virtual]

Set/Get the number of line segments representing the spline for this widget.

virtual void vtkSplineWidget::SetParametricSpline ( vtkParametricSpline * ) [virtual]

Set the parametric spline object. Through vtkParametricSpline's API, the user can supply and configure one of currently two types of spline: vtkCardinalSpline, vtkKochanekSpline. The widget controls the open or closed configuration of the spline. WARNING: The widget does not enforce internal consistency so that all three are of the same type.

virtual vtkParametricSpline* vtkSplineWidget::GetParametricSpline ( ) [virtual]

Set the parametric spline object. Through vtkParametricSpline's API, the user can supply and configure one of currently two types of spline: vtkCardinalSpline, vtkKochanekSpline. The widget controls the open or closed configuration of the spline. WARNING: The widget does not enforce internal consistency so that all three are of the same type.

void vtkSplineWidget::SetHandlePosition	(	int	handle,
		double	x,
		double	y,
		double	z
	)

Set/Get the position of the spline handles. Call GetNumberOfHandles to determine the valid range of handle indices.

void vtkSplineWidget::SetHandlePosition	(	int	handle,
		double	xyz[3]
	)

Set/Get the position of the spline handles. Call GetNumberOfHandles to determine the valid range of handle indices.

void vtkSplineWidget::GetHandlePosition	(	int	handle,
		double	xyz[3]
	)

Set/Get the position of the spline handles. Call GetNumberOfHandles to determine the valid range of handle indices.

double* vtkSplineWidget::GetHandlePosition ( int handle )

Set/Get the position of the spline handles. Call GetNumberOfHandles to determine the valid range of handle indices.

void vtkSplineWidget::SetClosed ( int closed )

Control whether the spline is open or closed. A closed spline forms a continuous loop: the first and last points are the same, and derivatives are continuous. A minimum of 3 handles are required to form a closed loop. This method enforces consistency with user supplied subclasses of vtkSpline.

virtual int vtkSplineWidget::GetClosed ( ) [virtual]

Control whether the spline is open or closed. A closed spline forms a continuous loop: the first and last points are the same, and derivatives are continuous. A minimum of 3 handles are required to form a closed loop. This method enforces consistency with user supplied subclasses of vtkSpline.

virtual void vtkSplineWidget::ClosedOn ( ) [virtual]

Control whether the spline is open or closed. A closed spline forms a continuous loop: the first and last points are the same, and derivatives are continuous. A minimum of 3 handles are required to form a closed loop. This method enforces consistency with user supplied subclasses of vtkSpline.

virtual void vtkSplineWidget::ClosedOff ( ) [virtual]

Control whether the spline is open or closed. A closed spline forms a continuous loop: the first and last points are the same, and derivatives are continuous. A minimum of 3 handles are required to form a closed loop. This method enforces consistency with user supplied subclasses of vtkSpline.

int vtkSplineWidget::IsClosed ( )

Convenience method to determine whether the spline is closed in a geometric sense. The widget may be set "closed" but still be geometrically open (e.g., a straight line).

double vtkSplineWidget::GetSummedLength ( )

Get the approximate vs. the true arc length of the spline. Calculated as the summed lengths of the individual straight line segments. Use SetResolution to control the accuracy.

void vtkSplineWidget::InitializeHandles ( vtkPoints * points )

Convenience method to allocate and set the handles from a vtkPoints instance. If the first and last points are the same, the spline sets Closed to the on state and disregards the last point, otherwise Closed remains unchanged.