Method paintEvent

src/gui/widgets/EnvelopeAndLfoView.cpp:416–580

void EnvelopeAndLfoView::paintEvent( QPaintEvent * )
{
	QPainter p( this );
	p.setRenderHint( QPainter::Antialiasing );

	// draw envelope-graph
	p.drawPixmap( ENV_GRAPH_X, ENV_GRAPH_Y, *s_envGraph );
	// draw LFO-graph
	p.drawPixmap( LFO_GRAPH_X, LFO_GRAPH_Y, *s_lfoGraph );


	p.setFont( pointSize<8>( p.font() ) );

	const float gray_amount = 1.0f - fabsf( m_amountKnob->value<float>() );

	p.setPen( QPen( QColor( static_cast<int>( 96 * gray_amount ),
				static_cast<int>( 255 - 159 * gray_amount ),
				static_cast<int>( 128 - 32 * gray_amount ) ),
									2 ) );

	const QColor end_points_color( 0x99, 0xAF, 0xFF );
	const QColor end_points_bg_color( 0, 0, 2 );

	const int y_base = ENV_GRAPH_Y + s_envGraph->height() - 3;
	const int avail_height = s_envGraph->height() - 6;
	
	int x1 = static_cast<int>( m_predelayKnob->value<float>() * TIME_UNIT_WIDTH );
	int x2 = x1 + static_cast<int>( m_attackKnob->value<float>() * TIME_UNIT_WIDTH );
	int x3 = x2 + static_cast<int>( m_holdKnob->value<float>() * TIME_UNIT_WIDTH );
	int x4 = x3 + static_cast<int>( ( m_decayKnob->value<float>() *
						( 1 - m_sustainKnob->value<float>() ) ) * TIME_UNIT_WIDTH );
	int x5 = x4 + static_cast<int>( m_releaseKnob->value<float>() * TIME_UNIT_WIDTH );

	if( x5 > 174 )
	{
		x1 = ( x1 * 174 ) / x5;
		x2 = ( x2 * 174 ) / x5;
		x3 = ( x3 * 174 ) / x5;
		x4 = ( x4 * 174 ) / x5;
		x5 = ( x5 * 174 ) / x5;
	}
	x1 += ENV_GRAPH_X + 2;
	x2 += ENV_GRAPH_X + 2;
	x3 += ENV_GRAPH_X + 2;
	x4 += ENV_GRAPH_X + 2;
	x5 += ENV_GRAPH_X + 2;

	p.drawLine( x1, y_base, x2, y_base - avail_height );
	p.fillRect( x1 - 1, y_base - 2, 4, 4, end_points_bg_color );
	p.fillRect( x1, y_base - 1, 2, 2, end_points_color );

	p.drawLine( x2, y_base - avail_height, x3, y_base - avail_height );
	p.fillRect( x2 - 1, y_base - 2 - avail_height, 4, 4,
							end_points_bg_color );
	p.fillRect( x2, y_base - 1 - avail_height, 2, 2, end_points_color );

	p.drawLine( x3, y_base-avail_height, x4, static_cast<int>( y_base -
								avail_height +