EqCurve.h

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/*
 * EqCurve.h - defination of EqCurve and EqHandle classes.
 *
* Copyright (c) 2015 Steffen Baranowsky <BaraMGB/at/freenet/dot/de>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
#ifndef EQCURVE_H
#define EQCURVE_H
 
#include <QGraphicsObject>
 
 
namespace lmms::gui
{
 
 
enum class EqHandleType {
        HighPass=1,
        LowShelf,
        Para,
        HighShelf,
        LowPass
};
 
 
 
 
// implements the Eq_Handle to control a band
class EqHandle : public QGraphicsObject
{
        Q_OBJECT
public:
        EqHandle( int num, int x, int y );
 
        static float freqToXPixel( float freq, int w );
        static float xPixelToFreq( float x , int w );
        static float gainToYPixel( float gain, int h, float pixelPerUnitHeight );
        static float yPixelToGain( float y, int h, float pixelPerUnitHeight );
 
        QRectF boundingRect() const override;
        QPainterPath getCurvePath();
        float getPeakCurve( float x );
        float getHighShelfCurve( float x );
        float getLowShelfCurve( float x );
        float getLowCutCurve( float x );
        float getHighCutCurve( float x );
        float getResonance();
        int getNum();
        EqHandleType getType();
        void setType( EqHandleType t );
        void setResonance( float r );
        bool isMouseHover();
        void setMouseHover( bool d );
        bool isActiveHandle();
        void setHandleActive( bool a );
        bool mousePressed() const;
        void sethp12();
        void sethp24();
        void sethp48();
        void setlp12();
        void setlp24();
        void setlp48();
 
signals:
        void positionChanged();
 
protected:
        void mousePressEvent( QGraphicsSceneMouseEvent *event ) override;
        void mouseReleaseEvent( QGraphicsSceneMouseEvent *event ) override;
        void paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget ) override;
        void wheelEvent( QGraphicsSceneWheelEvent *wevent ) override;
        void hoverEnterEvent( QGraphicsSceneHoverEvent *hevent ) override;
        void hoverLeaveEvent( QGraphicsSceneHoverEvent *hevent ) override;
        QVariant itemChange( GraphicsItemChange change, const QVariant &value ) override;
 
private:
        double calculateGain( const double freq, const double a1, const double a2, const double b0, const double b1, const double b2 );
        void loadPixmap();
        float m_pixelsPerUnitWidth;
        float m_pixelsPerUnitHeight;
        float m_scale;
        bool m_hp12;
        bool m_hp24;
        bool m_hp48;
        bool m_lp12;
        bool m_lp24;
        bool m_lp48;
        bool m_mouseHover;
        EqHandleType m_type;
        int m_numb;
        float m_width, m_heigth;
        float m_resonance;
        bool m_mousePressed;
        bool m_active;
        QPixmap m_circlePixmap;
};
 
 
 
 
class EqCurve : public QGraphicsObject
{
        Q_OBJECT
public:
        EqCurve( QList<EqHandle*> *handle, int x, int y );
        QRectF boundingRect() const override;
        void setModelChanged(bool mc);
 
protected:
        void paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget ) override;
 
private:
        QList<EqHandle*> *m_handle;
        QPainterPath m_curve;
        QPixmap m_curvePixmapCache;
        int m_width, m_heigth;
        int m_alpha;
        bool m_modelChanged;
        float m_pixelsPerUnitHeight;
        float m_scale;
};
 
 
} // namespace lmms::gui
 
#endif // EQCURVE_H