Revit二次開發之拾取軸網交點和標高

參考：

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

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

 

需要找到到布設腳手架起點,所以最終決定利用軸網來實現此功能

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

    //選擇點
    MessageBox.Show("選擇軸網交點(大概就可以會自動識別)");
    XYZ sel_point = uiDocument.Selection.PickPoint(ObjectSnapTypes.None,"選擇軸網交點");

    //獲取所有軸網
    FilteredElementCollector filteredElementCollector = new FilteredElementCollector(document);
    filteredElementCollector.OfClass(typeof(Grid));

    //過濾出所有直線軸網
    List<Grid> lineGrid = new List<Grid>();
    foreach (Grid g in filteredElementCollector)
    {
        if ((g.Curve as Line) != null) lineGrid.Add(g);
    }
    //變量;
    Grid grid_n1 = null;
    Grid grid_n2 = null;
    double dis1 = double.MaxValue;
    double dis2 = double.MaxValue;
    //遍歷軸網，計算出離選擇點最近的一條軸網
    foreach (Grid g in lineGrid)
    {
        if (g.Curve.Distance(sel_point) < dis1)
        {
            grid_n1 = g;
            dis1 = g.Curve.Distance(sel_point);
        }
    }
    //遍歷軸網，計算出離選擇點最近的第二條軸網
    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;//交點數組
    SetComparisonResult result = line1.Intersect(line2, out results);

    if (result != SetComparisonResult.Overlap)//重疊，沒有重疊就是平行
    {
        throw new InvalidOperationException("重疊，沒有重疊就是平行");
    }
    if (results == null || results.Size != 1)//沒有交點或者交點不是1個
    {
        throw new InvalidOperationException("沒有交點或者交點不是1個");
    }
    IntersectionResult iResult = results.get_Item(0);//取得交點
    XYZ intersectionPoint = iResult.XYZPoint;//取得交點坐標

    return intersectionPoint;
}

但隨后發現,上述方法得到的Z坐標一直都是0,所以無奈，只能在去尋找標高,來作為Z坐標

但要注意單位,方法返回的數值為英尺,包括坐標系的單位均為英尺,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;
}