vtkWidgetRepresentation.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkWidgetRepresentation.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.

=========================================================================*/
#ifndef vtkWidgetRepresentation_h
#define vtkWidgetRepresentation_h

#include "vtkInteractionWidgetsModule.h" // For export macro
#include "vtkProp.h"
#include "vtkWeakPointer.h" // needed for vtkWeakPointer iVar.

class vtkAbstractPropPicker;
class vtkPickingManager;
class vtkRenderer;


class VTKINTERACTIONWIDGETS_EXPORT vtkWidgetRepresentation : public vtkProp
{
public:

  vtkTypeMacro(vtkWidgetRepresentation,vtkProp);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkBooleanMacro(PickingManaged, bool);
  vtkSetMacro(PickingManaged, bool);
  vtkGetMacro(PickingManaged, bool);


  virtual void SetRenderer(vtkRenderer *ren);
  virtual vtkRenderer* GetRenderer();
  virtual void BuildRepresentation() = 0;

  virtual void PlaceWidget(double* vtkNotUsed(bounds[6])) {}
  virtual void StartWidgetInteraction(double eventPos[2]) { (void)eventPos; }
  virtual void WidgetInteraction(double newEventPos[2]) { (void)newEventPos; }
  virtual void EndWidgetInteraction(double newEventPos[2]) { (void)newEventPos; }
  virtual int ComputeInteractionState(int X, int Y, int modify=0);
  virtual int GetInteractionState()
    {return this->InteractionState;}
  virtual void Highlight(int vtkNotUsed(highlightOn)) {}


  vtkSetClampMacro(PlaceFactor,double,0.01,VTK_DOUBLE_MAX);
  vtkGetMacro(PlaceFactor,double);


  vtkSetClampMacro(HandleSize,double,0.001,1000);
  vtkGetMacro(HandleSize,double);


  vtkGetMacro( NeedToRender, int );
  vtkSetClampMacro( NeedToRender, int, 0, 1 );
  vtkBooleanMacro( NeedToRender, int );

  virtual double *GetBounds() {return NULL;}
  virtual void ShallowCopy(vtkProp *prop);
  virtual void GetActors(vtkPropCollection *) {}
  virtual void GetActors2D(vtkPropCollection *) {}
  virtual void GetVolumes(vtkPropCollection *) {}
  virtual void ReleaseGraphicsResources(vtkWindow *) {}
  virtual int RenderOverlay(vtkViewport *vtkNotUsed(viewport)) {return 0;}
  virtual int RenderOpaqueGeometry(vtkViewport *vtkNotUsed(viewport)) {return 0;}
  virtual int RenderTranslucentPolygonalGeometry(vtkViewport *vtkNotUsed(viewport)) {return 0;}
  virtual int RenderVolumetricGeometry(vtkViewport *vtkNotUsed(viewport)) {return 0;}
  virtual int HasTranslucentPolygonalGeometry() { return 0; }

protected:
  vtkWidgetRepresentation();
  ~vtkWidgetRepresentation();

  // The renderer in which this widget is placed
  vtkWeakPointer<vtkRenderer> Renderer;

  // The state of this representation based on a recent event
  int InteractionState;

  // These are used to track the beginning of interaction with the representation
  // It's dimensioned [3] because some events re processed in 3D.
  double StartEventPosition[3];

  // Instance variable and members supporting suclasses
  double PlaceFactor; // Used to control how widget is placed around bounding box
  int    Placed; // Indicate whether widget has been placed
  void   AdjustBounds(double bounds[6], double newBounds[6], double center[3]);
  double InitialBounds[6]; //initial bounds on place widget (valid after PlaceWidget)
  double InitialLength; //initial length on place widget

  // Sizing handles is tricky because the procedure requires information
  // relative to the last pick, as well as a live renderer to perform
  // coordinate conversions. In some cases, a pick is never made so handle
  // sizing has to follow a different path. The following ivars help with
  // this process.
  int    ValidPick; //indicate when valid picks are made

  // This variable controls whether the picking is managed by the Picking
  // Manager or not. True by default.
  bool PickingManaged;

  virtual void RegisterPickers();

  virtual void UnRegisterPickers();

  virtual void PickersModified();

  vtkPickingManager* GetPickingManager();

  vtkAssemblyPath* GetAssemblyPath(double X, double Y, double Z,
                                   vtkAbstractPropPicker* picker);


  // Members use to control handle size. The two methods return a "radius"
  // in world coordinates. Note that the HandleSize data member is used
  // internal to the SizeHandles__() methods.
  double HandleSize; //controlling relative size of widget handles
  double SizeHandlesRelativeToViewport(double factor, double pos[3]);
  double SizeHandlesInPixels(double factor,double pos[3]);

  // Try and reduce multiple renders
  int NeedToRender;

  // This is the time that the representation was built. This data member
  // can be used to reduce the time spent building the widget.
  vtkTimeStamp  BuildTime;

private:
  vtkWidgetRepresentation(const vtkWidgetRepresentation&) VTK_DELETE_FUNCTION;
  void operator=(const vtkWidgetRepresentation&) VTK_DELETE_FUNCTION;
};

#endif