SoView2DSliceZoom.h

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/*************************************************************************************
**
** Copyright 2007, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
#pragma once
 
#include "SoView2DInteractionExtension.h"
 
//------------------------------------------------------------------
 
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 zoomAroundClickPosition;

  SoSFBool evalStarted;
 

  static void   initClass();

  SoView2DSliceZoom();

  void   startDrawing(View2DSliceList *slicelist) override;

  bool   evalEvent(SoView2D* view2d, View2DSliceList* slicelist,
    View2DEvent* ec, View2DEventPhase phase) override;
 
  void toggleZoomToCursor();
 
protected:
  void doZoom(float diffY, SoView2D* view2d);
 
  void updateZoomCenter(int deviceX, int deviceY, SoView2D* view2d, View2DSliceList* slicelist) const;

  void editingOnChanged(SoField* field) override;

  void startPressAt(const SoPointerPosition& pos) override;
  void dragMoveTo(const SoPointerPosition& pos) override;
  SoPointingAction* endPress(int clickCount) override;
 
  void pointerPosition(SoState* state, const SoPointerPosition& pos) override;
  void pointerLeftWindow(SoState* state) override;
 
  SoCommandAction* _zoomToCursorAction;

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

  bool _started;
 
private:
  using SoView2DInteractionExtension::pointerPosition;
  using SoView2DInteractionExtension::pointerLeftWindow;
};