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Program: Visualization Toolkit
Module: vtkAffineWidget.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or for details.
This software is distributed WITHOUT ANY WARRANTY; without even
PURPOSE. See the above copyright notice for more information.
// .NAME vtkAffineWidget - perform affine transformations
// .SECTION Description
// The vtkAffineWidget is used to perform affine transformations on objects.
// (Affine transformations are transformations that keep parallel lines parallel.
// Affine transformations include translation, scaling, rotation, and shearing.)
// To use this widget, set the widget representation. The representation
// maintains a transformation matrix and other instance variables consistent
// with the transformations applied by this widget.
// .SECTION Event Bindings
// By default, the widget responds to the following VTK events (i.e., it
// watches the vtkRenderWindowInteractor for these events):
// <pre>
// LeftButtonPressEvent - select widget: depending on which part is selected
// translation, rotation, scaling, or shearing may follow.
// LeftButtonReleaseEvent - end selection of widget.
// MouseMoveEvent - interactive movement across widget
// </pre>
// Note that the event bindings described above can be changed using this
// class's vtkWidgetEventTranslator. This class translates VTK events
// into the vtkAffineWidget's widget events:
// <pre>
// vtkWidgetEvent::Select -- focal point is being selected
// vtkWidgetEvent::EndSelect -- the selection process has completed
// vtkWidgetEvent::Move -- a request for widget motion
// </pre>
// In turn, when these widget events are processed, the vtkAffineWidget
// invokes the following VTK events on itself (which observers can listen for):
// <pre>
// vtkCommand::StartInteractionEvent (on vtkWidgetEvent::Select)
// vtkCommand::EndInteractionEvent (on vtkWidgetEvent::EndSelect)
// vtkCommand::InteractionEvent (on vtkWidgetEvent::Move)
// </pre>
#ifndef __vtkAffineWidget_h
#define __vtkAffineWidget_h
#include "vtkAbstractWidget.h"
class vtkAffineRepresentation;
class VTK_WIDGETS_EXPORT vtkAffineWidget : public vtkAbstractWidget
// Description:
// Instantiate this class.
static vtkAffineWidget *New();
// Description:
// Standard VTK class macros.
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// 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.
void SetRepresentation(vtkAffineRepresentation *r)
// Description:
// Create the default widget representation if one is not set.
void CreateDefaultRepresentation();
// Description:
// Methods for activiating this widget. This implementation extends the
// superclasses' in order to resize the widget handles due to a render
// start event.
virtual void SetEnabled(int);
// These are the callbacks for this widget
static void SelectAction(vtkAbstractWidget*);
static void EndSelectAction(vtkAbstractWidget*);
static void MoveAction(vtkAbstractWidget*);
static void ModifyEventAction(vtkAbstractWidget*);
// helper methods for cursor management
void SetCursor(int state);
//BTX - manage the state of the widget
int WidgetState;
enum _WidgetState
// Keep track whether key modifier key is pressed
int ModifierActive;
vtkAffineWidget(const vtkAffineWidget&); //Not implemented
void operator=(const vtkAffineWidget&); //Not implemented