qtdso-0.3.1.rar converterhistogramwid.cpp

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#include <converterhistogramwid.h>
#include <qpixmap.h>
#include <qpainter.h>
#include <stdlib.h>
#include <dso.h>
#include <math.h>

ConverterHistogramWid::ConverterHistogramWid( QWidget *parent, const char *name ) :
QWidget( parent, name )
{
setBackgroundMode( QWidget::NoBackground );

clearSLOT();
}

ConverterHistogramWid::~ConverterHistogramWid()
{
}

void
ConverterHistogramWid::paintEvent( QPaintEvent * )
{
QPixmap buf( size() );
//buf.fill( colorGroup().base() );
buf.fill( Qt::black );

QPainter p;
p.begin( &amt;buf );
p.setPen( Qt::green );

for (int i=0; i<256; ++i)
{
p.drawLine( i, height()-1, i, height()-1-(int)(m_drawFac*m_histogram[i]) );
}

p.end();

p.begin( this );
p.drawPixmap( 0, 0, buf );
p.end();
}

void
ConverterHistogramWid::addValues( Dso *dso, int channel )
{
double max = 0.0;
int shift = dso->bits()-8;

if (shift >= 0)
{
for (int i=0; i<4096; ++i)
{
int sample = dso->data( channel, i ) >> shift;

m_histogram[sample]++;

max = QMAX( max, m_histogram[sample] );
m_max = QMAX( m_max, sample );
m_min = QMIN( m_min, sample );
m_numSamples++;
m_sum += sample;
}
}
else
{
for (int i=0; i<4096; ++i)
{
int sample = dso->data( channel, i ) << (-shift);

m_histogram[sample]++;

max = QMAX( max, m_histogram[sample] );
m_max = QMAX( m_max, sample );
m_min = QMIN( m_min, sample );
m_numSamples++;
m_sum += sample;
}
}

m_drawFac = (double)height() / max;

update();
}

void
ConverterHistogramWid::clearSLOT()
{
for (int i=0; i<256; ++i)
{
m_histogram[i] = 0.0;
}
m_drawFac = 0.0;
m_numSamples = 0.0;
m_max = 0;
m_sum = 0.0;
m_min = 10000000;

m_timer.start();
}

double
ConverterHistogramWid::mean() const
{
if (m_numSamples != 0.0)
{
return m_sum / m_numSamples;
}

return 0.0;
}

double
ConverterHistogramWid::stdDeviation() const
{
double m = mean();
double sum = 0.0;

for (int i=0; i<256; ++i)
{
const double delta = m_histogram[i] - m;
sum += delta*delta;
}

return sqrt( sum / 256.0 );
}