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

// Author: Max Howell <max.howell@methylblue.com>, (C) 2004
// Copyright: See COPYING file that comes with this distribution

#include "boomanalyzer.h"
#include <cmath>
#include <QPainter>

const char* BoomAnalyzer::kName = QT_TRANSLATE_NOOP("AnalyzerContainer", "Boom analyzer");

BoomAnalyzer::BoomAnalyzer( QWidget *parent )
    : Analyzer::Base(parent)
    , K_barHeight( 1.271 )//1.471
    , F_peakSpeed( 1.103 )//1.122
    , F( 1.0 )
    , bar_height( BAND_COUNT, 0 )
    , peak_height( BAND_COUNT, 0 )
    , peak_speed( BAND_COUNT, 0.01 )
    , barPixmap( COLUMN_WIDTH, 50 )
{
}

void
BoomAnalyzer::changeK_barHeight( int newValue )
{
    K_barHeight = (double)newValue / 1000;
}

void
BoomAnalyzer::changeF_peakSpeed( int newValue )
{
    F_peakSpeed = (double)newValue / 1000;
}

void BoomAnalyzer::resizeEvent(QResizeEvent *) {
  init();
}

void
BoomAnalyzer::init()
{
    const uint HEIGHT = height() - 2;
    const double h = 1.2 / HEIGHT;

    F = double(HEIGHT) / (log10( 256 ) * 1.1 /*<- max. amplitude*/);

    barPixmap = QPixmap( COLUMN_WIDTH-2, HEIGHT );

    QPainter p( &barPixmap );
    for( uint y = 0; y < HEIGHT; ++y )
    {
        const double F = (double)y * h;

        p.setPen(QColor(
            qMax(0, 255 - int(229.0 * F)),
            qMax(0, 255 - int(229.0 * F)),
            qMax(0, 255 - int(191.0 * F))));
        p.drawLine( 0, y, COLUMN_WIDTH-2, y );
    }
}

void
BoomAnalyzer::analyze( QPainter& p, const Scope& scope )
{
    float h;
    const uint MAX_HEIGHT = height() - 1;

    for( uint i = 0, x = 0, y; i < BAND_COUNT; ++i, x += COLUMN_WIDTH+1 )
    {
        h = log10( scope[i]*256.0 ) * F;

        if( h > MAX_HEIGHT )
           h = MAX_HEIGHT;

        if( h > bar_height[i] )
        {
            bar_height[i] = h;

            if( h > peak_height[i] )
            {
                peak_height[i] = h;
                peak_speed[i]  = 0.01;
            }
            else goto peak_handling;
        }
        else
        {
            if( bar_height[i] > 0.0 )
            {
                bar_height[i] -= K_barHeight; //1.4
                if( bar_height[i] < 0.0 ) bar_height[i] = 0.0;
            }

        peak_handling:

            if( peak_height[i] > 0.0 )
            {
                peak_height[i] -= peak_speed[i];
                peak_speed[i]  *= F_peakSpeed; //1.12

                if( peak_height[i] < bar_height[i] ) peak_height[i] = bar_height[i];
                if( peak_height[i] < 0.0 ) peak_height[i] = 0.0;
            }
        }

        y = height() - uint(bar_height[i]);
        p.drawPixmap(x+1, y, barPixmap, 0, y, -1, -1);
        p.setPen( palette().color(QPalette::Highlight) );
        if (bar_height[i] > 0)
          p.drawRect( x, y, COLUMN_WIDTH - 1, height() - y - 1 );

        y = height() - uint(peak_height[i]);
        p.setPen( palette().color(QPalette::Base) );
        p.drawLine( x, y, x+COLUMN_WIDTH-1, y );
    }
}