Section: Visualization Toolkit Widget Classes
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.
.SECTION Event Bindings By default, the widget responds to the following VTK events (i.e., it watches the vtkRenderWindowInteractor for these events): <pre> LeftButtonPressEvent - add a point or select a handle MouseMoveEvent - position the second point or move a handle LeftButtonReleaseEvent - release the handle </pre>
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: <pre> 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. </pre>
This widget invokes the following VTK events on itself (which observers can listen for): <pre> 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)) </pre>
To create an instance of class vtkDistanceWidget, simply invoke its constructor as follows
obj = vtkDistanceWidget
obj
is an instance of the vtkDistanceWidget class.
string = obj.GetClassName ()
- Standard methods for a VTK class.
int = obj.IsA (string name)
- Standard methods for a VTK class.
vtkDistanceWidget = obj.NewInstance ()
- Standard methods for a VTK class.
vtkDistanceWidget = obj.SafeDownCast (vtkObject o)
- Standard methods for a VTK class.
obj.SetEnabled (int )
- The method for activiating and deactiviating this widget. This method
must be overridden because it is a composite widget and does more than
its superclasses' vtkAbstractWidget::SetEnabled() method.
obj.SetRepresentation (vtkDistanceRepresentation r)
- Create the default widget representation if one is not set.
obj.CreateDefaultRepresentation ()
- Create the default widget representation if one is not set.
obj.SetProcessEvents (int )
- Methods to change the whether the widget responds to interaction.
Overridden to pass the state to component widgets.