在revit建模过程中由于管道不平行导致后期添加标注出错，通过手工方式对齐再移动会降低建模效率。
可通过REVIT API 编写宏命令实现一建管道平行，提高建模效率。

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/// <summary>
/// 管道平行
/// </summary>
public void ElementRote()
{
	Document doc =this.ActiveUIDocument.Document;			
          Autodesk.Revit.UI.Selection.Selection sel =this.ActiveUIDocument.Selection;
          var eids =sel.GetElementIds();
          ElementSet els=new ElementSet();
          Line L1=null;
          Transaction ts1 = new Transaction(doc, "revit");
      	ts1.Start();
          foreach (var eid in eids)
          {
          	var elem=doc.GetElement(eid); 
              LocationCurve lCurve = elem.Location as LocationCurve;                
              if(L1==null)
              {
              	//设置基准管道
              	L1=lCurve.Curve as Line;
              }
              Line L2=lCurve.Curve as Line;
              //计算角度
              double deg=GetDegree(L2,L1);
              //管道旋转
              RotateColumn(doc,elem,L2,deg);               
          }
           ts1.Commit();
}
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/// <summary>
/// 计算旋转角度
/// </summary>
/// <param name="L1"></param>
/// <param name="L2"></param>
/// <returns></returns>
public double GetDegree (Line L1,Line L2)
{
	XYZ first=L1.GetEndPoint(0);
	XYZ second=L1.GetEndPoint(1);
	XYZ third=L2.GetEndPoint(0);
	XYZ fourth=L2.GetEndPoint(1);
         var A = Math.Atan2(second.Y - first.Y, second.X - first.X);
          var B = Math.Atan2(fourth.Y - third.Y, fourth.X - third.X);
          return (double)(B - A);
}
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/// <summary>
/// 旋转管道
/// </summary>
public void RotateColumn(Autodesk.Revit.DB.Document document, Autodesk.Revit.DB.Element element,Line lcenter,double deg)
{
  		//设置旋转中心
	XYZ point1 = lcenter.GetEndPoint(0);
  		XYZ point2 = new XYZ(point1.X,point1.Y,point1.Z+30);
  		Line axis = Line.CreateBound(point1, point2);
  		//管道旋转
  		ElementTransformUtils.RotateElement(document, element.Id, axis, deg);
}