Acad::ErrorStatus CEntityUtil::Rotate(AcDbObjectId entId,const AcGePoint2d &ptBase,double rotation){    //几何变换矩陈    AcGeMatrix3d xform;    //向量    AcGeVector3d vec(0.0,0.0,1.0);    //设置需要进行的变换    xform.setToRotation(rotation,vec,CConvertUtil::ToPoint3d(ptBase));    //定义实体指针    AcDbEntity *pEnt=NULL;    //试图打开实体    Acad::ErrorStatus es=acdbOpenObject(pEnt,entId,AcDb::kForWrite,false);    //如果不出错则执行转换    if (es==Acad::eOk)    {        es=pEnt->transformBy(xform);        pEnt->close();    }    return es;}