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/***************************************************************************
Graphical spline display for equalizer
(c) 2004 Mark Kretschmann <markey@web.de>
(c) 2005 Markus Brueffer <markus@brueffer.de>
Based on code from XMMS
(c) 1998-2000 Peter Alm, Mikael Alm, Olle Hallnas, Thomas Nilsson and 4Front Technologies
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "amarokconfig.h"
#include "equalizergraph.h"
#include <tqpainter.h>
#include <tqpixmap.h>
#include <tqvaluelist.h>
#include <tdeapplication.h>
EqualizerGraph::EqualizerGraph( TQWidget* parent )
: TQWidget( parent, 0, TQt::WNoAutoErase )
, m_backgroundPixmap( new TQPixmap() )
, m_composePixmap( new TQPixmap() )
{
}
EqualizerGraph::~EqualizerGraph()
{
delete m_backgroundPixmap;
delete m_composePixmap;
}
/////////////////////////////////////////////////////////////////////////////////////
// PROTECTED
/////////////////////////////////////////////////////////////////////////////////////
void
EqualizerGraph::resizeEvent( TQResizeEvent* )
{
drawBackground();
}
TQSize
EqualizerGraph::sizeHint() const
{
return TQSize( 100, 60 );
}
void
EqualizerGraph::paintEvent( TQPaintEvent* )
{
bitBlt( m_composePixmap, 0, 0, m_backgroundPixmap );
TQPainter p( m_composePixmap );
// Draw middle line
int middleLineY = (int) ( ( height() - 1 ) / 2.0 + AmarokConfig::equalizerPreamp() * ( height() - 1 ) / 200.0 );
TQPen pen( colorGroup().dark(), 0, TQt::DotLine);
p.setPen( pen );
p.drawLine( 8, middleLineY, width() - 1, middleLineY );
TQColor color( colorGroup().highlight() );
int h, s, v;
color.getHsv( &h, &s, &v );
int i, y, ymin, ymax, py = 0;
float x[NUM_BANDS], yf[NUM_BANDS];
float gains[NUM_BANDS] = { 0, 0, 0, 0, 0, 0, 0, 0, 0};
// Don't calculate 0 and NUM_BANDS-1 for accuracy reasons
for ( i = 1; i < NUM_BANDS -1 ; i++)
x[i] = ( width() - 8 ) * i / ( NUM_BANDS -1 ) + 8;
x[ 0 ] = 8;
x[ NUM_BANDS - 1 ] = width() - 1;
if ( AmarokConfig::equalizerEnabled() )
for ( i = 0; i < NUM_BANDS; i++ )
gains[i] = ( height() - 1 ) * AmarokConfig::equalizerGains()[i] / 200.0;
init_spline( x, gains, NUM_BANDS, yf );
for ( i = 8; i < width(); i++ ) {
y = (int) ( ( height() - 1 ) / 2 - eval_spline( x, gains, yf, NUM_BANDS, i ) );
if ( y < 0 )
y = 0;
if ( y > height() - 1 )
y = height() - 1;
if ( i == 8 )
py = y;
if ( y < py ) {
ymin = y;
ymax = py;
} else {
ymin = py;
ymax = y;
}
py = y;
for ( y = ymin; y <= ymax; y++ ) {
// Absolute carthesian coordinate
s = y - ( height() - 1 ) / 2;
s = TQABS(s);
// Normalise to a base of 256
// short for: s / ( ( height() / 2.0 ) * 255;
s = (int) ( s * 510.0 / height() );
color.setHsv( h, 255 - s, v );
p.setPen( color );
p.drawPoint( i, y );
}
}
p.end();
bitBlt( this, 0, 0, m_composePixmap );
}
/////////////////////////////////////////////////////////////////////////////////////
// PRIVATE
/////////////////////////////////////////////////////////////////////////////////////
void
EqualizerGraph::drawBackground()
{
m_backgroundPixmap->resize( size() );
m_composePixmap->resize( size() );
m_backgroundPixmap->fill( colorGroup().background().dark( 105 ) );
TQPainter p( m_backgroundPixmap );
// Erase background for scale
p.fillRect( 0, 0, 7, height() -1, colorGroup().background());
// Draw scale
p.setPen( colorGroup().shadow() );
p.drawLine( 7, 0, 7, height() - 1 );
p.drawLine( 0, 0, 7, 0 );
p.drawLine( 0, height() / 2 - 1, 7, height() / 2 - 1 );
p.drawLine( 0, height() - 1, 7, height() - 1 );
}
void
EqualizerGraph::init_spline( float* x, float* y, int n, float* y2 )
{
int i, k;
float p, qn, sig, un;
TQMemArray<float> u(n * sizeof(float));
y2[ 0 ] = u[ 0 ] = 0.0;
for ( i = 1; i < n - 1; i++ ) {
sig = ( (float)x[i] - x[i-1] ) / ( (float)x[i+1] - x[i-1] );
p = sig * y2[i-1] + 2.0;
y2[i] = ( sig - 1.0 ) / p;
u[i] = ( ( (float)y[i+1] - y[i] ) / ( x[i+1] - x[i] ) ) - ( ( (float)y[i] - y[i-1] ) / ( x[i] - x[i-1] ) );
u[i] = ( 6.0 * u[i] / ( x[i+1] - x[i-1] ) - sig * u[i-1] ) / p;
}
qn = un = 0.0;
y2[n-1] = ( un - qn * u[n-2] ) / ( qn * y2[n-2] + 1.0 );
for ( k = n - 2; k >= 0; k-- )
y2[k] = y2[k] * y2[k+1] + u[k];
}
float
EqualizerGraph::eval_spline( float xa[], float ya[], float y2a[], int n, float x )
{
int klo, khi, k;
float h, b, a;
klo = 0;
khi = n - 1;
while ( khi - klo > 1 ) {
k = ( khi + klo ) >> 1;
if ( xa[k] > x )
khi = k;
else
klo = k;
}
h = xa[khi] - xa[klo];
a = ( xa[khi] - x ) / h;
b = ( x - xa[klo] ) / h;
return ( a * ya[klo] + b * ya[khi] + ( ( a*a*a - a ) * y2a[klo] + ( b*b*b - b ) * y2a[khi] ) * ( h*h ) / 6.0 );
}
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