Get pointer to class written in the script

Hi all.
I'm use qtscriptgenerator for make Qt classes in the scripts.
I wrote a class Trace inherits of QGraphicsItem and add a new function Trace.prototype.mouseMove = function( angle, x, y ).

How I can call this function from main programm?
May I get a pointer to class Trace in the main programm?

Code:

function tr(s)
{
  return s;
}
 
function Trace( parent )
{
  QGraphicsItem.call( this, parent );
 
  this.setData( 0, 1000 );
  this.setData( 1, 0 );
  this.setData( 2, tr("Ð¡Ð»ÐµÐ´ Ð½Ð° Ð½Ð¸Ð¶Ð½ÐµÐ¹ Ñ‡Ð°ÑÑ‚Ð¸ Ñ‡Ð°ÑˆÐºÐ¸ Ð·Ð°Ñ‚Ð²Ð¾Ñ€Ð°") );
  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, 50, 25 );
}
 
Trace.prototype.paint = function( painter, styleOptionGraphicsItem, widget )
{
  if (this.isSelected())
    painter.setPen( this.selectedPen );
  else
    painter.setPen( this.normalPen );
 
  painter.drawArc( 0, 0, 50, 50, 2750, -2600 );
}
 
Trace.prototype.type = function()
{
  return UserType + 1;
}
 
Trace.prototype.mouseMove = function( angle, x, y )
{
  if (this.isSelected())
    this.setRotation( -angle - 90 );
}
 
function addTrace()
{
  var z = new Trace( Qt.Scene );
  z.setPos( 275, 525 );
  z.setTransformOriginPoint( z.mapFromParent( 300, 460 ) );
}
 
function getInfo()
{
  return tr("Ð¡Ð»ÐµÐ´ Ð½Ð° Ð½Ð¸Ð¶Ð½ÐµÐ¹ Ñ‡Ð°ÑÑ‚Ð¸ Ñ‡Ð°ÑˆÐºÐ¸ Ð·Ð°Ñ‚Ð²Ð¾Ñ€Ð°");
}
 
function getData()
{
  return 0;
}

Thanks!