MeVisLab/Standard/Sources/Inventor/SoView2D/extensions/SoView2DSliceZoom.h

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#ifndef __SoView2DSliceZoom_H
#define __SoView2DSliceZoom_H
//----------------------------------------------------------------------------------
// **InsertLicense** code
//----------------------------------------------------------------------------------
//----------------------------------------------------------------------------------

#ifndef __SoView2DInteractionExtension_H
#include "SoView2DInteractionExtension.h"
#endif

//------------------------------------------------------------------
class SOVIEW2D_API SoView2DSliceZoom : public SoView2DInteractionExtension {

  SO_NODE_HEADER(SoView2DSliceZoom);

public:

  enum DragMode {
      DRAG_TAKE_AND_PUSH,
      DRAG_APPROACH_AND_DEPART
  };

  SoSFFloat min;
  SoSFFloat max;
  SoSFFloat sensitivity;
  // mhi 20051013: allow inversion of currently implemented mouse move direction.
  SoSFEnum dragMode;
  SoSFBool useAlternativeZoomFormula;

  SoSFBool evalStarted;


  static void   initClass();

  SoView2DSliceZoom();

  virtual void   startDrawing(View2DSliceList *slicelist);

  bool   evalEvent(SoView2D* view2d, View2DSliceList* slicelist,
    View2DEvent* ec, View2DEventPhase phase);


protected:
  void doZoom(float diffY, SoView2D* view2d);


  virtual void startPressAt(const SoPointerPosition& pos);
  virtual void dragMoveTo(const SoPointerPosition& pos);
  virtual SoPointingAction* endPress(int clickCount);

  float _oldY;
  float _currentx;
  float _currenty;
  float _newcenterx;
  float _newcentery;
  bool  _gotoOn;

  bool _started;
};

#endif