var prj = DlxApp.GetJob().GetProject("Example Sch");
if (!prj.IsValid())
  prj = DlxApp.GetJob().NewProject("Example Sch");
var doc = prj.GetDocument("Examples Sch", DlxApp.DOCTYPE_SCHEMATIC);
if (!doc.IsValid())
{
  doc = prj.NewDocument("Examples Sch", DlxApp.DOCTYPE_SCHEMATIC);
  doc.SetPageFormat("A4", false);
}
if (doc.IsValid() && doc.Activate())
{
  var page = doc.GetActivePage();
  if (page.IsValid())
  {
    var layer = page.GetLayerFromType(DlxApp.LAYERTYPE_DRAWING);
    if (layer.IsValid())
    {
      var pos = layer.GetFrontObjectIterator();
      while (pos.IsValid())
      {
        var obj = layer.GetNextObject(pos);
        if (obj.GetType() == DlxApp.OBJTYPE_CURVE)
        {
          // Extends the curve.
          var angle = obj.GetPoint(1).ArcAngle(obj.GetStartPoint());
          obj.SetPoint(0, obj.GetStartPoint().CirclePoint(20, angle));
          angle = obj.GetPoint(obj.GetPointCount()-2).ArcAngle(obj.GetEndPoint());
          obj.SetPoint(obj.GetPointCount()-1, obj.GetEndPoint().CirclePoint(20, angle));
          // Set the curve thickness to 2mm.
          var pen = new DlxPenStyle();
          obj.GetStyle(pen);
          pen.SetWidth(2);
          obj.SetStyle(pen);
          DlxApp.Printf("Curve type: %s", obj.GetCurveType() == DlxApp.CURVETYPE_BEZIER ? "Bezier Spline" : "Cardinal Spline");
        }
      }
    }
  }
}