136 lines
3.4 KiB
C++
136 lines
3.4 KiB
C++
// Author: Max Howell <max.howell@methylblue.com>, (C) 2004
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// Copyright: See COPYING file that comes with this distribution
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#include "boomanalyzer.h"
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#include <cmath>
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#include <QPainter>
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const char* BoomAnalyzer::kName = QT_TRANSLATE_NOOP("AnalyzerContainer", "Boom analyzer");
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BoomAnalyzer::BoomAnalyzer( QWidget *parent )
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: Analyzer::Base( parent, 9 )
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, K_barHeight( 1.271 )//1.471
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, F_peakSpeed( 1.103 )//1.122
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, F( 1.0 )
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, bar_height( BAND_COUNT, 0 )
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, peak_height( BAND_COUNT, 0 )
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, peak_speed( BAND_COUNT, 0.01 )
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, barPixmap( COLUMN_WIDTH, 50 )
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{
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}
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void
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BoomAnalyzer::changeK_barHeight( int newValue )
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{
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K_barHeight = (double)newValue / 1000;
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}
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void
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BoomAnalyzer::changeF_peakSpeed( int newValue )
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{
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F_peakSpeed = (double)newValue / 1000;
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}
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void BoomAnalyzer::resizeEvent(QResizeEvent *) {
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init();
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}
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void
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BoomAnalyzer::init()
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{
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const uint HEIGHT = height() - 2;
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const double h = 1.2 / HEIGHT;
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F = double(HEIGHT) / (log10( 256 ) * 1.1 /*<- max. amplitude*/);
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barPixmap = QPixmap( COLUMN_WIDTH-2, HEIGHT );
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QPainter p( &barPixmap );
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for( uint y = 0; y < HEIGHT; ++y )
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{
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const double F = (double)y * h;
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p.setPen(QColor(
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qMax(0, 255 - int(229.0 * F)),
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qMax(0, 255 - int(229.0 * F)),
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qMax(0, 255 - int(191.0 * F))));
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p.drawLine( 0, y, COLUMN_WIDTH-2, y );
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}
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}
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void
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BoomAnalyzer::transform( Scope &s )
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{
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float *front = static_cast<float*>( &s.front() );
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m_fht->spectrum( front );
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m_fht->scale( front, 1.0 / 60 );
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Scope scope( 32, 0 );
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const uint xscale[] = { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19,24,29,36,43,52,63,76,91,108,129,153,182,216,255 };
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for( uint j, i = 0; i < 32; i++ )
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for( j = xscale[i]; j < xscale[i + 1]; j++ )
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if ( s[j] > scope[i] )
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scope[i] = s[j];
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s = scope;
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}
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void
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BoomAnalyzer::analyze( QPainter& p, const Scope& scope )
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{
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float h;
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const uint MAX_HEIGHT = height() - 1;
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for( uint i = 0, x = 0, y; i < BAND_COUNT; ++i, x += COLUMN_WIDTH+1 )
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{
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h = log10( scope[i]*256.0 ) * F;
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if( h > MAX_HEIGHT )
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h = MAX_HEIGHT;
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if( h > bar_height[i] )
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{
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bar_height[i] = h;
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if( h > peak_height[i] )
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{
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peak_height[i] = h;
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peak_speed[i] = 0.01;
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}
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else goto peak_handling;
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}
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else
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{
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if( bar_height[i] > 0.0 )
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{
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bar_height[i] -= K_barHeight; //1.4
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if( bar_height[i] < 0.0 ) bar_height[i] = 0.0;
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}
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peak_handling:
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if( peak_height[i] > 0.0 )
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{
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peak_height[i] -= peak_speed[i];
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peak_speed[i] *= F_peakSpeed; //1.12
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if( peak_height[i] < bar_height[i] ) peak_height[i] = bar_height[i];
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if( peak_height[i] < 0.0 ) peak_height[i] = 0.0;
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}
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}
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y = height() - uint(bar_height[i]);
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p.drawPixmap(x+1, y, barPixmap, 0, y, -1, -1);
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p.setPen( palette().color(QPalette::Highlight) );
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if (bar_height[i] > 0)
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p.drawRect( x, y, COLUMN_WIDTH - 1, height() - y - 1 );
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y = height() - uint(peak_height[i]);
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p.setPen( palette().color(QPalette::Base) );
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p.drawLine( x, y, x+COLUMN_WIDTH-1, y );
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}
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}
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