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vtkAffineWidget.h
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vtkAffineWidget.h
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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 http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/**
* @class vtkAffineWidget
* @brief perform affine transformations
*
* 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.
*
* @par 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>
*
* @par Event Bindings:
* 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>
*
* @par Event Bindings:
* 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"
#include "vtkInteractionWidgetsModule.h" // For export macro
class vtkAffineRepresentation;
class VTKINTERACTIONWIDGETS_EXPORT vtkAffineWidget : public vtkAbstractWidget
{
public:
/**
* Instantiate this class.
*/
static vtkAffineWidget* New();
///@{
/**
* Standard VTK class macros.
*/
vtkTypeMacro(vtkAffineWidget, vtkAbstractWidget);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@}
/**
* 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)
{
this->Superclass::SetWidgetRepresentation(reinterpret_cast<vtkWidgetRepresentation*>(r));
}
/**
* Return the representation as a vtkAffineRepresentation.
*/
vtkAffineRepresentation* GetAffineRepresentation()
{
return reinterpret_cast<vtkAffineRepresentation*>(this->WidgetRep);
}
/**
* Create the default widget representation if one is not set.
*/
void CreateDefaultRepresentation() override;
/**
* Methods for activating this widget. This implementation extends the
* superclasses' in order to resize the widget handles due to a render
* start event.
*/
void SetEnabled(int) override;
protected:
vtkAffineWidget();
~vtkAffineWidget() override;
// 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) override;
// Manage the state of the widget
int WidgetState;
enum _WidgetState
{
Start = 0,
Active
};
// Keep track whether key modifier key is pressed
int ModifierActive;
private:
vtkAffineWidget(const vtkAffineWidget&) = delete;
void operator=(const vtkAffineWidget&) = delete;
};
#endif