Revit API判断点与线是否相交

曲线有个curve.Distance(xyz)函数用来判断曲线与的距离。

[TransactionAttribute(Autodesk.Revit.Attributes.TransactionMode.Manual)]
public   class  cmdXyzLine : IExternalCommand
{
     public  Result Execute(ExternalCommandData commandData,  ref   string  messages, ElementSet elements)
    {
        UIApplication uiApp  =  commandData.Application;
        Document doc  =  uiApp.ActiveUIDocument.Document;
        Selection sel  =  uiApp.ActiveUIDocument.Selection;

        Transaction ts  =   new  Transaction(doc,  " http://revit.5d6d.com " );
        ts.Start();

         // 选取一直线，先风管吧。
        Duct duct  =  doc.GetElement(sel.PickObject(ObjectType.Element,  " 选取一风管 " ))  as  Duct;
         // 选取一点
        XYZ xyz  =  sel.PickPoint( " 选取一点 " );
         // 判断是否相交
        LocationCurve ductCurve  =  duct.Location  as  LocationCurve;
        TaskDialog.Show( " distance " , ductCurve.Curve.Distance(xyz).ToString());
         if  (ductCurve.Curve.Distance(xyz)  <   0.01 )
            TaskDialog.Show( " info " ,  " 相交 " );
         else
            TaskDialog.Show( " info " ,  " 不相交 " );
         // 风管上的点与风管曲线的距离
        TaskDialog.Show( " dis " , ductCurve.Curve.Distance(ductCurve.Curve.get_EndPoint( 0 )).ToString()  +   " 米 " );

        ts.Commit();

         return  Result.Succeeded;
    }
}

另外一个方法，比较专业，抽时间仔细研究研究：

///   <summary>
///  两曲线通过轨迹相同且相连则可合并
///   </summary>
///   <param name="uiApp"></param>
///   <param name="c1"></param>
///   <param name="c2"></param>
///   <returns></returns>
public   static  Curve Combine2Curve(UIApplication uiApp, Curve c1, Curve c2)
{
     //  两曲线均为直线
    Line l1  =  c1  as  Line;
     if  (l1  !=   null )
    {
        Line l2  =  c2  as  Line;
         if  (l2  !=   null )
        {
            XYZ vt1  =  LineAssistFunc.GetVector(l1);
            XYZ vt2  =  LineAssistFunc.GetVector(l2);
             //  平行
             if  (GeoUtil.IsParallel(vt1, vt2))
            {
                XYZ pts1  =  l1.get_EndPoint( 0 );
                XYZ pte1  =  l1.get_EndPoint( 1 );
                XYZ pts2  =  l2.get_EndPoint( 0 );
                XYZ pte2  =  l2.get_EndPoint( 1 );
                 //  相连
                 if  (pts1.DistanceTo(pts2)  <  precision  ||  pts1.DistanceTo(pte2)  <  precision  ||
                    pte1.DistanceTo(pts2)  <  precision  ||  pte1.DistanceTo(pte2)  <  precision)
                {
                    List < XYZ >  arPts  =   new  List < XYZ > ();
                    arPts.Add(pts1);
                    arPts.Add(pte1);
                    arPts.Add(pts2);
                    arPts.Add(pte2);
                    GeoUtil.SortPointByDirect(uiApp, arPts, vt1);

                    Line nLine  =  uiApp.Application.Create.NewLineBound(arPts.First(), arPts.Last());
                     return  nLine;
                }
            }
        }
    }

     //  两曲线均为弧线
    Arc a1  =  c1  as  Arc;
     if  (a1  !=   null )
    {
        Arc a2  =  c2  as  Arc;
         if  (a2  !=   null )
        {
             double  r1  =  a1.Radius;
             double  r2  =  a2.Radius;
            XYZ ptc1  =  a1.Center;
            XYZ ptc2  =  a2.Center;
             //  共线
             if  (Math.Abs(r1  -  r2)  <  precision  &&  ptc1.DistanceTo(ptc2)  <  precision)
            {
                XYZ pts1  =  a1.get_EndPoint( 0 );
                XYZ pte1  =  a1.get_EndPoint( 1 );
                XYZ pts2  =  a2.get_EndPoint( 0 );
                XYZ pte2  =  a2.get_EndPoint( 1 );
                 //  相连
                 if  (pts1.DistanceTo(pts2)  <  precision  ||  pts1.DistanceTo(pte2)  <  precision  ||
                    pte1.DistanceTo(pts2)  <  precision  ||  pte1.DistanceTo(pte2)  <  precision)
                {
                     //  相交的点为ptOnArc点，其余两点为弧线的起终点
                    XYZ ptStart  =   null , ptEnd  =   null , ptOnArc  =   null ;
                     if  (pts1.DistanceTo(pts2)  <  precision)
                    {
                        ptStart  =  pte1;
                        ptEnd  =  pte2;
                        ptOnArc  =  pts1;
                    }
                     else   if  (pts1.DistanceTo(pte2)  <  precision)
                    {
                        ptStart  =  pte1;
                        ptEnd  =  pts2;
                        ptOnArc  =  pts1;
                    }
                     else   if  (pte1.DistanceTo(pts2)  <  precision)
                    {
                        ptStart  =  pts1;
                        ptEnd  =  pte2;
                        ptOnArc  =  pte1;
                    }
                     else   if  (pte1.DistanceTo(pte2)  <  precision)
                    {
                        ptStart  =  pts1;
                        ptEnd  =  pts2;
                        ptOnArc  =  pte1;
                    }

                    Arc nArc  =  uiApp.Application.Create.NewArc(ptStart, ptEnd, ptOnArc);
                     return  nArc;
                }
            }
        }
    }

     return   null ;
}

from: http://revit.5d6d.com/thread-1379-1-1.html