void HBlockWidget::paintEvent( QPaintEvent * )
{
Channel *active = gdata->getActiveChannel();
beginDrawing();
if(active) {
AnalysisData *theData = active->dataAtCurrentChunk();
if(theData) {
//get a copy of theData so we don't hold the mutex for too long
active->lock();
AnalysisData data = *theData;
active->unlock();
// We have harmonicFreq - the actual frequencies of the harmonies - and harmonicAmp, their amplitude
//std::vector<float> harmonicFreq = active->lookup[frame].harmonicFreq;
std::vector<float> harmonicFreq = data.harmonicFreq;
// harmonicAmp values range between 0-1
//std::vector<float> harmonicAmp = active->lookup[frame].harmonicAmp;
std::vector<float> harmonicAmp = data.harmonicAmp;
// Get the frame's fundamental frequency
//float fund = active->lookup[frame].fundamentalFreq;
float fund = data.fundamentalFreq;
// Work out the bar height for each harmonic
double barHeight = double(height()) / double(harmonicFreq.size());
QColor fillColor = colorBetween(colorGroup().background(), active->color, data.volumeValue());
QColor outlineColor = colorBetween(colorGroup().background(), Qt::black, data.volumeValue());
p.setBrush(fillColor);
int barStart = 0;
float barWidth = 0;
int diff = 0;
/*
* Each note has a fundamental frequency f, which comes from the lookup table.
* The harmonic frequencies are defined as f, 2f, 3f, 4f, 5f...
* harmonicFreq stores what the harmonics have been calculated to be.
*/
for (uint i = 0; i < harmonicFreq.size(); i++) {
p.setPen(outlineColor);
p.setBrush(colorBetween(fillColor, Qt::black, data.harmonicNoise[i]));
// Work out how many pixels wide the harmonic should be
barWidth = (harmonicAmp.at(i)) * width();
/* Work out how many pixels the harmonic should be offset from where it would be
* if it were exactly (i+1)f */
//diff = toInt( (harmonicFreq.at(i) - (i+1) * fund) / fund * width() / 10.0 );
diff = toInt( (harmonicFreq.at(i) - (i+1) * fund) / fund * barWidth );
// Work out the starting position, and draw the bar
barStart = toInt( ((width() / 2) + diff) - barWidth / 2);
int barBottom = height() - toInt(barHeight * i);
p.drawRect(barStart, barBottom, toInt(barWidth), -toInt(barHeight));
// Draw the centre line on the bar
p.setPen(Qt::white);
p.drawLine((width() / 2) + diff, barBottom, (width() / 2) + diff, barBottom - toInt(barHeight));
}
// Draw the exact line (f, 2f, 3f...)
p.setPen(Qt::white);
p.drawLine(width() / 2, 0, width() /2, height());
}
}
endDrawing();
}
