OscilloscopeGraph.h

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/*
* OscilloscopeGraph.h - Oscilloscope graph widget to handle drawing the waveform and user scrolling/zooming
*
* Copyright (c) 2025-2026 Keratin
*
* 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 LMMS_GUI_OSCILLOSCOPE_GRAPH_H
#define LMMS_GUI_OSCILLOSCOPE_GRAPH_H
 
#include "OscilloscopeControls.h"
#include "LocklessRingBuffer.h"
#include <QWidget>
 
namespace lmms
{
 
class OscilloscopeControls;
class FloatModel;
 
namespace gui
{
 
class Knob;
 
class OscilloscopeGraph : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(QColor monoColor MEMBER m_monoColor)
    Q_PROPERTY(QColor leftColor MEMBER m_leftColor)
    Q_PROPERTY(QColor rightColor MEMBER m_rightColor)
    Q_PROPERTY(QColor minorLineColor MEMBER m_minorLineColor)
    Q_PROPERTY(QColor clippingLineColor MEMBER m_clippingLineColor)
    Q_PROPERTY(QColor backgroundColor MEMBER m_backgroundColor)
public:
    OscilloscopeGraph(QWidget* parent, OscilloscopeControls* controls);
    ~OscilloscopeGraph() override = default;
 
    void paintEvent(QPaintEvent* pe) override;
    void wheelEvent(QWheelEvent* we) override;
    void mousePressEvent(QMouseEvent* me) override;
    void mouseMoveEvent(QMouseEvent* me) override;

    static constexpr float MaxBufferLengthSeconds = 5.0f;
 
private slots:
    void changeSampleRate();
 
private:
    OscilloscopeControls* m_controls;
 
    LocklessRingBufferReader<SampleFrame> m_inputBufferReader;
 
    // Buffer which is actually drawn on the screen, not the ring buffer used for communication between threads
    std::vector<SampleFrame> m_ringBuffer;
    int m_ringBufferIndex = 0;
 
    int m_mousePos;
 
    QColor m_monoColor = QColor(255, 255, 255);
    QColor m_leftColor = QColor(126, 146, 255, 128);
    QColor m_rightColor = QColor(255, 128, 128, 128);
    QColor m_minorLineColor = QColor(100, 100, 100);
    QColor m_clippingLineColor = QColor(100, 0, 0);
    QColor m_backgroundColor = QColor(0, 0, 0);
};
 
} // namespace gui
 
} // namespace lmms
 
#endif // LMMS_GUI_OSCILLOSCOPE_GRAPH_H