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

public static XYZ Grid(UIDocument uiDocument)
{
    Document document = uiDocument.Document;

    //选择点
    MessageBox.Show("选择轴网交点(大概就可以会自动识别)");
    XYZ sel_point = uiDocument.Selection.PickPoint(ObjectSnapTypes.None,"选择轴网交点");

    //获取所有轴网
    FilteredElementCollector filteredElementCollector = new FilteredElementCollector(document);
    filteredElementCollector.OfClass(typeof(Grid));

    //过滤出所有直线轴网
    List<Grid> lineGrid = new List<Grid>();
    foreach (Grid g in filteredElementCollector)
    {
        if ((g.Curve as Line) != null) lineGrid.Add(g);
    }
    //变量;
    Grid grid_n1 = null;
    Grid grid_n2 = null;
    double dis1 = double.MaxValue;
    double dis2 = double.MaxValue;
    //遍历轴网，计算出离选择点最近的一条轴网
    foreach (Grid g in lineGrid)
    {
        if (g.Curve.Distance(sel_point) < dis1)
        {
            grid_n1 = g;
            dis1 = g.Curve.Distance(sel_point);
        }
    }
    //遍历轴网，计算出离选择点最近的第二条轴网
    foreach (Grid g in lineGrid)
    {
        if (!(g.Curve as Line).Direction.IsAlmostEqualTo((grid_n1.Curve as Line).Direction) && g.Curve.Distance(sel_point) < dis2)
        {
            grid_n2 = g;
            dis2 = g.Curve.Distance(sel_point);
        }
    }

    Line line1 = grid_n1.Curve as Line;
    Line line2 = grid_n2.Curve as Line;

    IntersectionResultArray results;//交点数组
    SetComparisonResult result = line1.Intersect(line2, out results);

    if (result != SetComparisonResult.Overlap)//重叠，没有重叠就是平行
    {
        throw new InvalidOperationException("重叠，没有重叠就是平行");
    }
    if (results == null || results.Size != 1)//没有交点或者交点不是1个
    {
        throw new InvalidOperationException("没有交点或者交点不是1个");
    }
    IntersectionResult iResult = results.get_Item(0);//取得交点
    XYZ intersectionPoint = iResult.XYZPoint;//取得交点坐标

    return intersectionPoint;
}

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

private static double level(UIDocument uiDocument,string LevelName)
{
    Document document = uiDocument.Document;

    Selection selection = uiDocument.Selection;

    Transaction transaction = new Transaction(document, "level");
    transaction.Start();

    FilteredElementCollector collector = new FilteredElementCollector(uiDocument.Document);
    ICollection<Element> collection = collector.OfClass(typeof(Level)).ToElements();
    Level level = null;
    foreach (Element e in collection)
    {
        if (e.Name == LevelName)
        {
            level = (Level)e;
        }
    }
    transaction.Commit();

    double Y = level.ProjectElevation;
    return Y;
}