mirror of
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126 lines
3.7 KiB
C++
126 lines
3.7 KiB
C++
/****************************************************************************
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* Copyright (C) 2016 Edouard Griffiths, F4EXB
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* Modifications made to:
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* - use the widget horizontally
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* - differentiate each area with a different color
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* - allow overload by 25% with indication of 100% threshold and overload
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef SDRBASE_GUI_LEVELMETER_H_
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#define SDRBASE_GUI_LEVELMETER_H_
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#include <QTime>
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#include <QWidget>
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#include <dsp/dsptypes.h>
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/**
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* Widget which displays a vertical audio level meter, indicating the
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* RMS and peak levels of the window of audio samples most recently analyzed
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* by the Engine.
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*/
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class LevelMeter : public QWidget
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{
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Q_OBJECT
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public:
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explicit LevelMeter(QWidget *parent = 0);
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~LevelMeter();
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void paintEvent(QPaintEvent *event);
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public slots:
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void reset();
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void levelChanged(qreal rmsLevel, qreal peakLevel, int numSamples);
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private slots:
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void redrawTimerExpired();
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private:
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/**
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* Height of RMS level bar.
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* Range 0.0 - 1.0.
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*/
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qreal m_rmsLevel;
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/**
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* Most recent peak level.
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* Range 0.0 - 1.0.
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*/
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qreal m_peakLevel;
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/**
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* Height of peak level bar.
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* This is calculated by decaying m_peakLevel depending on the
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* elapsed time since m_peakLevelChanged, and the value of m_decayRate.
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*/
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qreal m_decayedPeakLevel;
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/**
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* Time at which m_peakLevel was last changed.
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*/
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QTime m_peakLevelChanged;
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/**
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* Rate at which peak level bar decays.
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* Expressed in level units / millisecond.
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*/
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qreal m_peakDecayRate;
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/**
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* High watermark of peak level.
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* Range 0.0 - 1.0.
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*/
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qreal m_peakHoldLevel;
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/**
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* Time at which m_peakHoldLevel was last changed.
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*/
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QTime m_peakHoldLevelChanged;
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QTimer *m_redrawTimer;
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QColor m_rmsColor;
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QColor m_peakColor;
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QColor m_decayedPeakColor;
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};
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#endif /* SDRBASE_GUI_LEVELMETER_H_ */
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