TransferFunctionWidget.h

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#pragma once

#include <QtGui/QWidget.h>

class HoverPoints;


class TransferFunctionWidget : public QWidget
{
        Q_OBJECT
public:
        TransferFunctionWidget(QWidget *parent);
        ~TransferFunctionWidget(void);

        void setGradientStops(const QGradientStops &stops);
        void setHistogram(const std::vector<float> &hist);

        QSize sizeHint() const { return QSize(150, 80); }
        QPolygonF points() const;

        HoverPoints *hoverPoints() const { return _hoverPoints; }
        
        void paintEvent(QPaintEvent *);

        uint colorAt(int x);
        void resetPoints();

        virtual void resizeEvent(QResizeEvent *ev);
signals:
        void colorsChanged();
private:
        void generateHistogramImage(); 
        void generateShade();
        void scaleHistogram();
        std::vector<float> _histogram;
        QImage _histImage;
        QImage _shade;
        HoverPoints *_hoverPoints;
        QLinearGradient _alphaGradient;
};