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GraphModel: fix/improve normalize() function - remove bias before maximizing, also add some new slots for future use (which I plan to use for something neat in the future ;) )

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Vesa
2014-03-20 12:19:55 +02:00
parent 2a0f268a89
commit 7a7c9abd9b
2 changed files with 55 additions and 20 deletions
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55
src/gui/widgets/graph.cpp
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@@ -629,28 +629,61 @@ void graphModel::smoothNonCyclic()
emit samplesChanged(0, length()-1);
}
void graphModel::normalize()
{
float max = 0.0001f;
float avg = 0.0f;
// first correct dc offset by normalizing to average
for( int i = 0; i < length(); i++ )
{
if( fabsf(m_samples[i]) > max && m_samples[i] != 0.0f )
{
max = fabs( m_samples[i] );
}
}
avg += m_samples[i];
avg /= length();
for( int i = 0; i < length(); i++ )
m_samples[i] -= avg;
// then maximize
for( int i = 0; i < length(); i++ )
max = qMax( max, qAbs( m_samples[i] ) );
for( int i = 0; i < length(); i++ )
{
m_samples[i] /= max;
}
m_samples[i] = qBound( m_minValue, m_samples[i] / max, m_maxValue );
if( max != 1.0f ) {
// signal changes if any
if( max != 1.0f || avg != 0.0f )
emit samplesChanged( 0, length()-1 );
}
}
void graphModel::invert()
{
const float range = m_maxValue - m_minValue;
for( int i = 0; i < length(); i++ )
m_samples[i] = m_minValue + ( range - ( m_samples[i] - m_minValue ) );
emit samplesChanged( 0, length()-1 );
}
void graphModel::shiftPhase( int _deg )
{
// calculate offset in samples
int offset = ( _deg * length() ) / 360; //multiply first because integers
// store values in temporary array
QVector<float> temp = m_samples;
// shift phase
for( int i = 0; i < length(); i++ )
m_samples[i] = temp[ ( i + offset ) % length() ];
emit samplesChanged( 0, length()-1 );
}
#include "moc_graph.cxx"