cxTransferFunctionAlphaWidget.h

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

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modification, are permitted provided that the following conditions are met:

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   this list of conditions and the following disclaimer.

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   this list of conditions and the following disclaimer in the documentation 
   and/or other materials provided with the distribution.

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   may be used to endorse or promote products derived from this software 
   without specific prior written permission.

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#ifndef CXTRANSFERFUNCTIONALPHAWIDGET_H_
#define CXTRANSFERFUNCTIONALPHAWIDGET_H_

#include "cxGuiExport.h"

#include "cxBaseWidget.h"

#include <limits.h>
#include "cxImage.h"
#include "cxForwardDeclarations.h"
#include "cxActiveImageProxy.h"
class QRect;

namespace cx
{
class cxGui_EXPORT TransferFunctionAlphaWidget : public BaseWidget
{    
  Q_OBJECT

        void clearBackground(QPainter &painter);
public:
  TransferFunctionAlphaWidget(ActiveDataPtr activeData, QWidget* parent);
  virtual ~TransferFunctionAlphaWidget();

  void setData(ImagePtr image, ImageTFDataPtr tfData);
  void setReadOnly(bool readOnly);
  
public slots:
  void activeImageTransferFunctionsChangedSlot(); 

protected:
  struct AlphaPoint
  {
    int position;
    int value;
    AlphaPoint() :
      position(INT_MIN),
      value(INT_MIN)
      {}
        AlphaPoint(int pos, int val) :
          position(pos),
          value(val)
          {}
        void reset()
    {
      position = INT_MIN;
      value = INT_MIN;
    }
    bool isValid()
    {
      if(position != INT_MIN)
        return true;
      return false;
    }
  }; 

  virtual void enterEvent(QEvent* event);
  virtual void leaveEvent(QEvent* event); 
  virtual void mousePressEvent(QMouseEvent* event); 
  virtual void mouseReleaseEvent(QMouseEvent* event); 
  virtual void mouseMoveEvent(QMouseEvent* event);  
  virtual void keyPressEvent(QKeyEvent* event);

  virtual void paintEvent(QPaintEvent* event); 
  virtual void resizeEvent(QResizeEvent* evt);

  AlphaPoint selectPoint(QPoint pos);
  AlphaPoint getCurrentAlphaPoint(QPoint pos);
  void toggleSelectedPoint(QPoint pos);
  void moveCurrentAlphaPoint(AlphaPoint newAlphaPoint);
  QPoint alpha2screen(AlphaPoint pt) const;
  void updateTooltip(QPoint pos);
  void updateTooltip(AlphaPoint point);

  bool isEndpoint(int intensity) const;
  void paintHistogram(QPainter& painter);
  void paintOpacityGraph(QPainter& painter);
  std::pair<int,int> findAllowedMoveRangeAroundAlphaPoint(int selectedPointIntensity);

  QRect mFullArea; 
  QRect mPlotArea; 
  int mBorder;
  bool mReadOnly;

  std::map<int, QRect> mPointRects; 
  AlphaPoint mSelectedAlphaPoint;
//  bool mEndPoint;///< Current alpha point is an endpoint

  ImagePtr mImage;
  ImageTFDataPtr mImageTF;
  ActiveImageProxyPtr mActiveImageProxy;

  virtual QSize sizeHint () const { return QSize(200, 100);};
};
}
#endif /* CXTRANSFERFUNCTIONALPHAWIDGET_H_ */