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#ifndef QVIS_GAUSSIAN_OPACITY_BAR_H
#define QVIS_GAUSSIAN_OPACITY_BAR_H

#include "QvisAbstractOpacityBar.h"
#include "vtkQvisModule.h" // for export macro

class QPixmap;

// ****************************************************************************
//  Class:  QvisGaussianOpacityBar
//
//  Purpose:
//    Gaussian-max implementation of QvisAbstractOpacityBar
//
//  Programmer:  Jeremy Meredith
//  Creation:    January 30, 2001
//
//  Modifications:
//
// ****************************************************************************

class VTKQVIS_EXPORT QvisGaussianOpacityBar : public QvisAbstractOpacityBar
{
  Q_OBJECT
public:
  QvisGaussianOpacityBar(QWidget* parent = NULL, const char* name = NULL);
  ~QvisGaussianOpacityBar();
  void getRawOpacities(int, float*);
  int getNumberOfGaussians();
  void getGaussian(int, float*, float*, float*, float*, float*);
  void setGaussian(int, float*, float*, float*, float*, float*);
  void setAllGaussians(int, float*);
  void setMaximumNumberOfGaussians(int);
  void setMinimumNumberOfGaussians(int);

protected:
  void mouseMoveEvent(QMouseEvent*);
  void mousePressEvent(QMouseEvent*);
  void mouseReleaseEvent(QMouseEvent*);
  void paintToPixmap(int, int);
  void drawControlPoints(QPainter& painter);

private:
  enum Mode
  {
    modeNone,
    modeX,
    modeH,
    modeW,
    modeWR,
    modeWL,
    modeB
  };
  // encapsulation of gaussian parameters
  class Gaussian
  {
  public:
    float x;
    float h;
    float w;
    float bx;
    float by;

  public:
    Gaussian(float x_, float h_, float w_, float bx_, float by_)
      : x(x_)
      , h(h_)
      , w(w_)
      , bx(bx_)
      , by(by_){};
    Gaussian(){};
    ~Gaussian(){};
  };

  // the list of gaussians
  int ngaussian;
  Gaussian gaussian[200];

  // the current interaction mode and the current gaussian
  Mode currentMode;
  int currentGaussian;

  // GUI interaction variables
  bool mousedown;
  int lastx;
  int lasty;

  // User specified constraints
  int maximumNumberOfGaussians;
  int minimumNumberOfGaussians;

  // helper functions
  bool findGaussianControlPoint(int, int, int*, Mode*);
  void removeGaussian(int);
  void addGaussian(float, float, float, float, float);
};

#endif
