/// <summary>
/// This node will select grids along a model curve element ordered based on the start of the model curve.
/// This works in the active view. So whatever plan representation your grids have, that is what is used.
/// </summary>
/// <param name="modelCurve">Revit model curve to select grids along.</param>
/// <returns name="orderedGrids">The intersecting grids ordered from beginning to end of the line.</returns>
public static List <global::Revit.Elements.Grid> IntersectingGridsByModelCurve(global::Revit.Elements.ModelCurve modelCurve)
{
ModelCurve mCurve = modelCurve.InternalElement as ModelCurve;
Autodesk.Revit.DB.Document doc = DocumentManager.Instance.CurrentDBDocument;
List <global::Revit.Elements.Grid> intersectingGrids = new List <global::Revit.Elements.Grid>();
IList <Autodesk.Revit.DB.Element> grids = new FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Grids).WhereElementIsNotElementType().ToElements();
foreach (var grid in grids)
{
Grid g = grid as Grid;
Curve c = g.GetCurvesInView(DatumExtentType.ViewSpecific, doc.ActiveView).First();
Curve c2 = mCurve.GeometryCurve;
Point pt1 = Point.ByCoordinates(0, 0, c.GetEndPoint(0).Z);
Point pt2 = Point.ByCoordinates(0, 0, c2.GetEndPoint(0).Z);
XYZ vec = Vector.ByTwoPoints(pt2, pt1).ToRevitType();
var transformed = c2.CreateTransformed(Transform.CreateTranslation(vec));
SetComparisonResult test = c.Intersect(transformed);
if (test == SetComparisonResult.Overlap ||
test == SetComparisonResult.Subset ||
test == SetComparisonResult.Superset ||
test == SetComparisonResult.Equal)
{
intersectingGrids.Add(g.ToDSType(true) as global::Revit.Elements.Grid);
}
}
return(intersectingGrids.OrderBy(g => g.Curve.DistanceTo(modelCurve.Curve.StartPoint)).ToList());
}