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#ifndef QvisAbstractOpacityBar_H
#define QvisAbstractOpacityBar_H

#include <qframe.h>
#include "vtkQvisModule.h" // for export macro

class QPixmap;

namespace pointsprite { class ColorControlPointList; }

// ****************************************************************************
//  Class:  QvisAbstractOpacityBar
//
//  Purpose:
//    Abstract base for an opacity map editor
//
//  Programmer:  Jeremy Meredith
//  Creation:    January 30, 2001
//
// ****************************************************************************
class VTKQVIS_EXPORT QvisAbstractOpacityBar : public QFrame
{
    Q_OBJECT
  public:
                   QvisAbstractOpacityBar(QWidget *parent=NULL, const char *name=NULL);
    virtual       ~QvisAbstractOpacityBar();
    virtual void   getRawOpacities(int, float *) = 0;
    void           SetBackgroundColorControlPoints(const pointsprite::ColorControlPointList *ccp);
    void           SetBackgroundPixmap(QPixmap *background);
    void           SetShowBackgroundPixmap(bool show);

  protected:
    int            val2x(float);
    float          x2val(int);
    int            val2y(float);
    float          y2val(int);

    virtual void   paintEvent(QPaintEvent*);
    virtual void   resizeEvent(QResizeEvent*);
    virtual void   paintToPixmap(int,int) = 0;
    virtual void   paintBackground(QPainter &painter, int w, int h);

    QPixmap       *pix;
    QPixmap       *backgroundPixmap;
    bool           showBackgroundPixmap;
    const pointsprite::ColorControlPointList *backgroundColorControlPoints;

  signals:
    void           mouseReleased();
    void           mouseMoved();
    void           resized();
};

#endif
