Revit二次开发之拾取轴网交点和标高

参考：

https://blog.csdn.net/imfour/article/details/80148470

http://greatverve.cnblogs.com/archive/2011/03/16/revit-Intersection.html

需要找到到布设脚手架起点,所以最终决定利用轴网来实现此功能

 1 public static XYZ Grid(UIDocument uiDocument)
 2 {
 3     Document document = uiDocument.Document;
 4 
 5     //选择点
 6     MessageBox.Show("选择轴网交点(大概就可以会自动识别)");
 7     XYZ sel_point = uiDocument.Selection.PickPoint(ObjectSnapTypes.None,"选择轴网交点");
 8 
 9     //获取所有轴网
10     FilteredElementCollector filteredElementCollector = new FilteredElementCollector(document);
11     filteredElementCollector.OfClass(typeof(Grid));
12 
13     //过滤出所有直线轴网
14     List<Grid> lineGrid = new List<Grid>();
15     foreach (Grid g in filteredElementCollector)
16     {
17         if ((g.Curve as Line) != null) lineGrid.Add(g);
18     }
19     //变量;
20     Grid grid_n1 = null;
21     Grid grid_n2 = null;
22     double dis1 = double.MaxValue;
23     double dis2 = double.MaxValue;
24     //遍历轴网，计算出离选择点最近的一条轴网
25     foreach (Grid g in lineGrid)
26     {
27         if (g.Curve.Distance(sel_point) < dis1)
28         {
29             grid_n1 = g;
30             dis1 = g.Curve.Distance(sel_point);
31         }
32     }
33     //遍历轴网，计算出离选择点最近的第二条轴网
34     foreach (Grid g in lineGrid)
35     {
36         if (!(g.Curve as Line).Direction.IsAlmostEqualTo((grid_n1.Curve as Line).Direction) && g.Curve.Distance(sel_point) < dis2)
37         {
38             grid_n2 = g;
39             dis2 = g.Curve.Distance(sel_point);
40         }
41     }
42 
43     Line line1 = grid_n1.Curve as Line;
44     Line line2 = grid_n2.Curve as Line;
45 
46     IntersectionResultArray results;//交点数组
47     SetComparisonResult result = line1.Intersect(line2, out results);
48 
49     if (result != SetComparisonResult.Overlap)//重叠，没有重叠就是平行
50     {
51         throw new InvalidOperationException("重叠，没有重叠就是平行");
52     }
53     if (results == null || results.Size != 1)//没有交点或者交点不是1个
54     {
55         throw new InvalidOperationException("没有交点或者交点不是1个");
56     }
57     IntersectionResult iResult = results.get_Item(0);//取得交点
58     XYZ intersectionPoint = iResult.XYZPoint;//取得交点坐标
59 
60     return intersectionPoint;
61 }

但随后发现,上述方法得到的Z坐标一直都是0,所以无奈，只能在去寻找标高,来作为Z坐标

但要注意单位,方法返回的数值为英尺,包括坐标系的单位均为英尺,所以如果想化成毫米要*304.8

 1 private static double level(UIDocument uiDocument,string LevelName)
 2 {
 3     Document document = uiDocument.Document;
 4 
 5     Selection selection = uiDocument.Selection;
 6 
 7     Transaction transaction = new Transaction(document, "level");
 8     transaction.Start();
 9 
10     FilteredElementCollector collector = new FilteredElementCollector(uiDocument.Document);
11     ICollection<Element> collection = collector.OfClass(typeof(Level)).ToElements();
12     Level level = null;
13     foreach (Element e in collection)
14     {
15         if (e.Name == LevelName)
16         {
17             level = (Level)e;
18         }
19     }
20     transaction.Commit();
21 
22     double Y = level.ProjectElevation;
23     return Y;
24 }