Method paintEvent

src/gui/AutomationPatternView.cpp:233–425

void AutomationPatternView::paintEvent( QPaintEvent * )
{
	QPainter painter( this );

	if( !needsUpdate() )
	{
		painter.drawPixmap( 0, 0, m_paintPixmap );
		return;
	}

	setNeedsUpdate( false );

	m_paintPixmap = m_paintPixmap.isNull() == true || m_paintPixmap.size() != size()
		? QPixmap( size() ) : m_paintPixmap;

	QPainter p( &m_paintPixmap );

	QLinearGradient lingrad( 0, 0, 0, height() );
	QColor c;
	bool muted = m_pat->getTrack()->isMuted() || m_pat->isMuted();
	bool current = gui->automationEditor()->currentPattern() == m_pat;
	
	// state: selected, muted, normal
	c = isSelected() ? selectedColor() : ( muted ? mutedBackgroundColor() 
		:	painter.background().color() );

	lingrad.setColorAt( 1, c.darker( 300 ) );
	lingrad.setColorAt( 0, c );

	// paint a black rectangle under the pattern to prevent glitches with transparent backgrounds
	p.fillRect( rect(), QColor( 0, 0, 0 ) );

	if( gradient() )
	{
		p.fillRect( rect(), lingrad );
	}
	else
	{
		p.fillRect( rect(), c );
	}
	
	const float ppt = fixedTCOs() ?
			( parentWidget()->width() - 2 * TCO_BORDER_WIDTH )
				/ (float) m_pat->timeMapLength().getTact() :
								pixelsPerTact();

	const int x_base = TCO_BORDER_WIDTH;
	
	const float min = m_pat->firstObject()->minValue<float>();
	const float max = m_pat->firstObject()->maxValue<float>();

	const float y_scale = max - min;
	const float h = ( height() - 2 * TCO_BORDER_WIDTH ) / y_scale;
	const float ppTick  = ppt / MidiTime::ticksPerTact();

	p.translate( 0.0f, max * height() / y_scale - TCO_BORDER_WIDTH );
	p.scale( 1.0f, -h );