Method updateBackground

src/core/Track.cpp:1109–1147

void TrackContentWidget::updateBackground()
{
	const int tactsPerBar = 4;
	const TrackContainerView * tcv = m_trackView->trackContainerView();

	// Assume even-pixels-per-tact. Makes sense, should be like this anyways
	int ppt = static_cast<int>( tcv->pixelsPerTact() );

	int w = ppt * tactsPerBar;
	int h = height();
	m_background = QPixmap( w * 2, height() );
	QPainter pmp( &m_background );

	pmp.fillRect( 0, 0, w, h, darkerColor() );
	pmp.fillRect( w, 0, w , h, lighterColor() );

	// draw lines
	// vertical lines
	pmp.setPen( QPen( gridColor(), 1 ) );
	for( float x = 0; x < w * 2; x += ppt )
	{
		pmp.drawLine( QLineF( x, 0.0, x, h ) );
	}

	pmp.setPen( QPen( embossColor(), 1 ) );
	for( float x = 1.0; x < w * 2; x += ppt )
	{
		pmp.drawLine( QLineF( x, 0.0, x, h ) );
	}

	// horizontal line
	pmp.setPen( QPen( gridColor(), 1 ) );
	pmp.drawLine( 0, h-1, w*2, h-1 );

	pmp.end();

	// Force redraw
	update();
}