////// C++ Implementation: Sonogram//// Description:////// Author: Melchior FRANZ <mfranz@kde.org>, (C) 2004//// Copyright: See COPYING file that comes with this distribution////#include <qpainter.h>#include "sonogram.h"Sonogram::Sonogram(QWidget *parent) :    Analyzer::Base2D(parent, 16, 9){}Sonogram::~Sonogram(){}void Sonogram::init(){    eraseCanvas();}void Sonogram::resizeEvent(QResizeEvent *e){    QWidget::resizeEvent(e);    canvas()->resize(size());    background()->resize(size());//only for gcc < 4.0#if !( __GNUC__ > 4 || ( __GNUC__ == 4 && __GNUC_MINOR__ >= 0 ) )    resizeForBands(height() < 128 ? 128 : height());#endif    background()->fill(backgroundColor());    bitBlt(canvas(), 0, 0, background());    bitBlt(this, 0, 0, background());}void Sonogram::analyze(const Scope &s){    int x = width() - 1;    QColor c;    QPainter p(canvas());    bitBlt(canvas(), 0, 0, canvas(), 1, 0, x, height());    Scope::const_iterator it = s.begin(), end = s.end();    for (int y = height() - 1; y;) {        if (it >= end || *it < .005)            c = backgroundColor();        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;        p.setPen(c);        p.drawPoint(x, y--);        if (it < end)            ++it;    }}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(){    analyze(Scope(m_fht->size(), 0));}