Clementine-audio-player-Mac-Linux-Windows/src/analyzers/sonogram.cpp

//
//
// C++ Implementation: Sonogram
//
// Description:
//
//
// Author: Melchior FRANZ <mfranz@kde.org>, (C) 2004
//
// Copyright: See COPYING file that comes with this distribution
//
//

#include "sonogram.h"

#include <QPainter>

const char* Sonogram::kName = QT_TRANSLATE_NOOP("AnalyzerContainer", "Sonogram");

Sonogram::Sonogram(QWidget *parent) :
    Analyzer::Base(parent, 9)
{
}


Sonogram::~Sonogram()
{
}


void Sonogram::resizeEvent(QResizeEvent *e)
{
    QWidget::resizeEvent(e);

//only for gcc < 4.0
#if !( __GNUC__ > 4 || ( __GNUC__ == 4 && __GNUC_MINOR__ >= 0 ) )
    resizeForBands(height() < 128 ? 128 : height());
#endif

    canvas_ = QPixmap(size());
    canvas_.fill(palette().color(QPalette::Background));
}


void Sonogram::analyze(QPainter& p, const Scope &s, bool new_frame)
{
    int x = width() - 1;
    QColor c;

    QPainter canvas_painter(&canvas_);
    canvas_painter.drawPixmap(0, 0, canvas_, 1, 0, x, -1);

    Scope::const_iterator it = s.begin(), end = s.end();
    for (int y = height() - 1; y;) {
        if (it >= end || *it < .005)
            c = palette().color(QPalette::Background);
        else if (*it < .05)
            c.setHsv(95, 255, 255 - int(*it * 4000.0));
        else if (*it < 1.0)
            c.setHsv(95 - int(*it * 90.0), 255, 255);
        else
            c = Qt::red;

        canvas_painter.setPen(c);
        canvas_painter.drawPoint(x, y--);

        if (it < end)
            ++it;
    }

    canvas_painter.end();

    p.drawPixmap(0, 0, canvas_);
}


void Sonogram::transform(Scope &scope)
{
    float *front = static_cast<float*>(&scope.front());
    m_fht->power2(front);
    m_fht->scale(front, 1.0 / 256);
    scope.resize( m_fht->size() / 2 );
}


void Sonogram::demo(QPainter& p)
{
    analyze(p, Scope(m_fht->size(), 0), new_frame_);
}