function Trace( parent )
{
  QGraphicsItem.call( this, parent );

  this.setFlag( QGraphicsItem.ItemIsSelectable );
  this.normalPen = new QPen( new QColor( 0, 0, 0, 255 ), 2 );
  this.selectedPen = new QPen( new QColor( 0, 0, 255, 150 ), 2 );

  Qt.Scene.addItem( this );
}

Trace.prototype = new QGraphicsItem();

Trace.prototype.boundingRect = function()
{
  return new QRectF( 0, 0, 28, 14 );
}

Trace.prototype.paint = function( painter, styleOptionGraphicsItem, widget )
{
  if (this.isSelected())
    painter.setPen( this.selectedPen );
  else
    painter.setPen( this.normalPen );

  painter.drawArc( 0, 0, 28, 28, 2750, -2600 );
}

Trace.prototype.type = function()
{
  return UserType + 1;
}

Trace.prototype.mouseMove = function( angle, x, y )
{
  if (this.isSelected())
    this.setRotation( -angle - 90 );

  return angle;
}