一个简单得问题

代码如下：

  //GraphicList里面存放的是一个polyLINE里所有的图形
  private IGeometry getMulRect(GraphicList list) throws UnknownHostException, IOException
{
 Polyline pg = null;
 pg = new Polyline();
 IGeometryCollection gcc =pg.getAsIGeometryCollection() ;
 int size = list.size();
 IPointCollection pcc = new IPointCollectionProxy( pg);
 for(int i = 0;i  {
  Path seg = new Path();
  IPointCollection pc = new IPointCollectionProxy( seg);
  //自己的程序，可以得到里面的点的坐标
  Rect poly = (Rect)list.getGraphicAt(i);
  getPoly(poly,pc);
  pcc.addPointCollection(pc);

 }

 return pg.getAsIGeometry();

}

// poly,基本图形为几个矩形
public void getPoly(Graphic pp,IPointCollection pc) throws UnknownHostException,
  IOException
{
  if(pp instanceof Rect)
 {
  Rect rect = ( Rect)pp;
  IPoint p1 = new Point();
  p1.setY( rect.getNorthLat());
  p1.setX( rect.getEastLon());
  IPoint p2 = new Point();
  p2.setY( rect.getNorthLat());
  p2.setX( rect.getWestLon());
  IPoint p3 = new Point();
  p3.setY( rect.getSouthLat());
  p3.setX( rect.getWestLon());
  IPoint p4 = new Point();
  p4.setY( rect.getSouthLat());
  p4.setX( rect.getEastLon());
 

  pc.addPoint(   p2, null, null);  
  pc.addPoint(   p3, null, null);
  pc.addPoint(   p4, null, null);
  pc.addPoint(   p1, null, null);
  pc.addPoint(   p2, null, null);

 }

}

我传入得是四个不相连得矩形，为什么用这个程序执行起来，四个矩形都被连接起来了呢，哪位大侠帮忙看看

原图形是这样的：

用AE转换好成这样了：

有人知道为什么吗？