measure the distance between two points More...

#include <vtkDistanceWidget.h>

Inheritance diagram for vtkDistanceWidget:

Collaboration diagram for vtkDistanceWidget:

Public Types

enum	{ Start = 0, Define, Manipulate }
Public Member Functions
virtual void	SetEnabled (int)
void	CreateDefaultRepresentation ()
virtual void	SetProcessEvents (int)

void	SetRepresentation (vtkDistanceRepresentation *r)

vtkDistanceRepresentation *	GetDistanceRepresentation ()

virtual void	SetWidgetStateToStart ()
virtual void	SetWidgetStateToManipulate ()

virtual int	GetWidgetState ()
Static Public Member Functions
static vtkDistanceWidget *	New ()
Protected Member Functions
	vtkDistanceWidget ()
	~vtkDistanceWidget ()
void	StartDistanceInteraction (int handleNum)
void	DistanceInteraction (int handleNum)
void	EndDistanceInteraction (int handleNum)
Static Protected Member Functions
static void	AddPointAction (vtkAbstractWidget *)
static void	MoveAction (vtkAbstractWidget *)
static void	EndSelectAction (vtkAbstractWidget *)
Protected Attributes
int	WidgetState
int	CurrentHandle
vtkHandleWidget *	Point1Widget
vtkHandleWidget *	Point2Widget
vtkDistanceWidgetCallback *	DistanceWidgetCallback1
vtkDistanceWidgetCallback *	DistanceWidgetCallback2
Friends
class	vtkDistanceWidgetCallback
typedef vtkAbstractWidget	Superclass
static int	IsTypeOf (const char *type)
static vtkDistanceWidget *	SafeDownCast (vtkObjectBase *o)
virtual int	IsA (const char *type)
vtkDistanceWidget *	NewInstance () const
void	PrintSelf (ostream &os, vtkIndent indent)
virtual vtkObjectBase *	NewInstanceInternal () const

Detailed Description

measure the distance between two points

The vtkDistanceWidget is used to measure the distance between two points. The two end points can be positioned independently, and when they are released, a special PlacePointEvent is invoked so that special operations may be take to reposition the point (snap to grid, etc.) The widget has two different modes of interaction: when initially defined (i.e., placing the two points) and then a manipulate mode (adjusting the position of the two points).

To use this widget, specify an instance of vtkDistanceWidget and a representation (a subclass of vtkDistanceRepresentation). The widget is implemented using two instances of vtkHandleWidget which are used to position the end points of the line. The representations for these two handle widgets are provided by the vtkDistanceRepresentation.

Event Bindings:

By default, the widget responds to the following VTK events (i.e., it watches the vtkRenderWindowInteractor for these events):

   LeftButtonPressEvent - add a point or select a handle
   MouseMoveEvent - position the second point or move a handle
   LeftButtonReleaseEvent - release the handle

Event Bindings:

Note that the event bindings described above can be changed using this class's vtkWidgetEventTranslator. This class translates VTK events into the vtkDistanceWidget's widget events:

   vtkWidgetEvent::AddPoint -- add one point; depending on the state
                               it may the first or second point added. Or,
                               if near a handle, select the handle.
   vtkWidgetEvent::Move -- move the second point or handle depending on the state.
   vtkWidgetEvent::EndSelect -- the handle manipulation process has completed.

Event Bindings:

This widget invokes the following VTK events on itself (which observers can listen for):

   vtkCommand::StartInteractionEvent (beginning to interact)
   vtkCommand::EndInteractionEvent (completing interaction)
   vtkCommand::InteractionEvent (moving after selecting something)
   vtkCommand::PlacePointEvent (after point is positioned;
                                call data includes handle id (0,1))

See also:: vtkHandleWidget

Events:: vtkCommand::DisableEvent vtkCommand::EndInteractionEvent vtkCommand::MouseMoveEvent vtkCommand::InteractionEvent vtkCommand::EnableEvent vtkCommand::LeftButtonPressEvent vtkCommand::StartInteractionEvent vtkCommand::PlacePointEvent vtkCommand::LeftButtonReleaseEvent

Examples:: vtkDistanceWidget (Examples)

Tests:: vtkDistanceWidget (Tests)

Definition at line 88 of file vtkDistanceWidget.h.

Member Typedef Documentation

typedef vtkAbstractWidget vtkDistanceWidget::Superclass

Standard methods for a VTK class.

Reimplemented from vtkAbstractWidget.

Definition at line 96 of file vtkDistanceWidget.h.

Member Enumeration Documentation

anonymous enum

Description: Enum defining the state of the widget. By default the widget is in Start mode, and expects to be interactively placed. While placing the points the widget transitions to Define state. Once placed, the widget enters the Manipulate state. BTX

Enumerator:

Start
Define
Manipulate

Definition at line 132 of file vtkDistanceWidget.h.

Constructor & Destructor Documentation

vtkDistanceWidget::vtkDistanceWidget ( ) [protected]

vtkDistanceWidget::~vtkDistanceWidget ( ) [protected]

Member Function Documentation

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

Instantiate this class.

Reimplemented from vtkObject.

static int vtkDistanceWidget::IsTypeOf ( const char * type ) [static]

Standard methods for a VTK class.

Reimplemented from vtkAbstractWidget.

virtual int vtkDistanceWidget::IsA ( const char * type ) [virtual]

Standard methods for a VTK class.

Reimplemented from vtkAbstractWidget.

static vtkDistanceWidget* vtkDistanceWidget::SafeDownCast ( vtkObjectBase * o ) [static]

Standard methods for a VTK class.

Reimplemented from vtkAbstractWidget.

virtual vtkObjectBase* vtkDistanceWidget::NewInstanceInternal ( ) const [protected, virtual]

Standard methods for a VTK class.

Reimplemented from vtkAbstractWidget.

vtkDistanceWidget* vtkDistanceWidget::NewInstance ( ) const

Standard methods for a VTK class.

Reimplemented from vtkAbstractWidget.

void vtkDistanceWidget::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)		`[virtual]`

Standard methods for a VTK class.

Reimplemented from vtkAbstractWidget.

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

The method for activating and deactivating this widget. This method must be overridden because it is a composite widget and does more than its superclasses' vtkAbstractWidget::SetEnabled() method.

Reimplemented from vtkAbstractWidget.

void vtkDistanceWidget::SetRepresentation ( vtkDistanceRepresentation * r ) [inline]

Specify an instance of vtkWidgetRepresentation used to represent this widget in the scene. Note that the representation is a subclass of vtkProp so it can be added to the renderer independent of the widget.

Definition at line 109 of file vtkDistanceWidget.h.

vtkDistanceRepresentation* vtkDistanceWidget::GetDistanceRepresentation ( ) [inline]

Return the representation as a vtkDistanceRepresentation.

Definition at line 116 of file vtkDistanceWidget.h.

void vtkDistanceWidget::CreateDefaultRepresentation ( ) [virtual]

Create the default widget representation if one is not set.

Implements vtkAbstractWidget.

virtual void vtkDistanceWidget::SetProcessEvents ( int ) [virtual]

Methods to change the whether the widget responds to interaction. Overridden to pass the state to component widgets.

Reimplemented from vtkAbstractWidget.

virtual void vtkDistanceWidget::SetWidgetStateToStart ( ) [virtual]

Set the state of the widget. If the state is set to "Manipulate" then it is assumed that the widget and its representation will be initialized programmatically and is not interactively placed. Initially the widget state is set to "Start" which means nothing will appear and the user must interactively place the widget with repeated mouse selections. Set the state to "Start" if you want interactive placement. Generally state changes must be followed by a Render() for things to visually take effect.

virtual void vtkDistanceWidget::SetWidgetStateToManipulate ( ) [virtual]

Set the state of the widget. If the state is set to "Manipulate" then it is assumed that the widget and its representation will be initialized programmatically and is not interactively placed. Initially the widget state is set to "Start" which means nothing will appear and the user must interactively place the widget with repeated mouse selections. Set the state to "Start" if you want interactive placement. Generally state changes must be followed by a Render() for things to visually take effect.

virtual int vtkDistanceWidget::GetWidgetState ( ) [inline, virtual]

Return the current widget state.

Definition at line 151 of file vtkDistanceWidget.h.

static void vtkDistanceWidget::AddPointAction ( vtkAbstractWidget * ) [static, protected]