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c3b4d5188a
Replace old spectrum analyzer by new one with higher resolution and many new features. Resolves #2847.
127 lines
4.4 KiB
C++
127 lines
4.4 KiB
C++
/* SaSpectrumView.h - declaration of SaSpectrumView class.
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*
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* Copyright (c) 2019 Martin Pavelek <he29/dot/HS/at/gmail/dot/com>
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*
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* Based partially on Eq plugin code,
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* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef SASPECTRUMVIEW_H
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#define SASPECTRUMVIEW_H
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#include <string>
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#include <utility>
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#include <QPainterPath>
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#include <QWidget>
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class QMouseEvent;
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class QPainter;
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class SaControls;
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class SaProcessor;
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//! Widget that displays a spectrum curve and frequency / amplitude grid
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class SaSpectrumView : public QWidget
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{
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Q_OBJECT
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public:
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explicit SaSpectrumView(SaControls *controls, SaProcessor *processor, QWidget *_parent = 0);
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virtual ~SaSpectrumView() {}
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QSize sizeHint() const override {return QSize(400, 200);}
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protected:
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void paintEvent(QPaintEvent *event) override;
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void mouseMoveEvent(QMouseEvent *event) override;
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void mousePressEvent(QMouseEvent *event) override;
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void resizeEvent(QResizeEvent *event) override;
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private slots:
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void periodicUpdate();
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private:
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const SaControls *m_controls;
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SaProcessor *m_processor;
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// grid labels (position, label) and methods to generate them
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std::vector<std::pair<int, std::string>> m_logFreqTics; // 10-20-50... Hz
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std::vector<std::pair<int, std::string>> m_linearFreqTics; // 2k-4k-6k... Hz
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std::vector<std::pair<float, std::string>> m_logAmpTics; // dB
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std::vector<std::pair<float, std::string>> m_linearAmpTics; // 0..1
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std::vector<std::pair<int, std::string>> makeLogFreqTics(int low, int high);
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std::vector<std::pair<int, std::string>> makeLinearFreqTics(int low, int high);
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std::vector<std::pair<float, std::string>> makeLogAmpTics(int low, int high);
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std::vector<std::pair<float, std::string>> makeLinearAmpTics(int low, int high);
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// currently selected ranges (see SaControls.h for enum definitions)
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int m_freqRangeIndex;
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int m_ampRangeIndex;
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// draw the grid and all labels based on selected ranges
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void drawGrid(QPainter &painter);
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// local buffers for frequency bin values and a method to update them
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// (mainly needed for averaging and to keep track of peak values)
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std::vector<float> m_displayBufferL;
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std::vector<float> m_displayBufferR;
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std::vector<float> m_peakBufferL;
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std::vector<float> m_peakBufferR;
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void updateBuffers(float *spectrum, float *displayBuffer, float *peakBuffer);
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// final paths to be drawn by QPainter and methods to build them
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QPainterPath m_pathL;
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QPainterPath m_pathR;
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QPainterPath m_pathPeakL;
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QPainterPath m_pathPeakR;
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void refreshPaths();
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QPainterPath makePath(std::vector<float> &displayBuffer, float resolution);
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// helper variables for path drawing
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float m_decaySum; // indicates if there is anything left to draw
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bool m_freezeRequest; // new reference should be acquired
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bool m_frozen; // a reference is currently stored in the peakBuffer
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const float m_smoothFactor = 0.15; // alpha for exponential smoothing
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const float m_peakDecayFactor = 0.992; // multiplier for gradual peak decay
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// top level: refresh buffers, make paths and draw the spectrum
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void drawSpectrum(QPainter &painter);
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// current cursor location and a method to draw it
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QPoint m_cursor;
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void drawCursor(QPainter &painter);
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// wrappers for most used SaProcessor conversion helpers
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// (to make local code more readable)
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float binToFreq(unsigned int bin_index);
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float freqToXPixel(float frequency, unsigned int width);
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float ampToYPixel(float amplitude, unsigned int height);
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// current boundaries for drawing
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unsigned int m_displayTop;
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unsigned int m_displayBottom;
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unsigned int m_displayLeft;
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unsigned int m_displayRight;
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unsigned int m_displayWidth;
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};
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#endif // SASPECTRUMVIEW_H
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