Setting door position relative to nearby walls

A reader sent the image on the right and asked: “can we make door with specific distance to face of wall like 20 cm without every time need to adjust distance in temporary dimension ?”

This seemed like a good excuse to stop writing code dealing with Family Parameters (I was getting tired of writing it, were you getting tired of reading about it?).

public void DoorWallOffset() { UIDocument uidoc = this.ActiveUIDocument; Document doc = uidoc.Document; // establish an offset of 20cm that will be applied to the door and wall // Revit's internal units for distance is feet double doorToWallDistance = 20 / (12 * 2.54); // convert 20 cm to 1 ft try // try/catch block with PickObject is used to give the user a way to get out of the infinite loop of while (true) // PickObject throws an exception when user aborts from selection { while (true) { FamilyInstance door = doc.GetElement(uidoc.Selection.PickObject(ObjectType.Element, "Select a door. ESC when finished.").ElementId) as FamilyInstance; double doorWidth = door.Symbol.get_Parameter(BuiltInParameter.DOOR_WIDTH).AsDouble(); Wall sideWall = doc.GetElement(uidoc.Selection.PickObject(ObjectType.Element, "Select a wall. ESC when finished.").ElementId) as Wall; double sideWallWidth = sideWall.Width; // get the curve that defines the centerline of the side wall LocationCurve sideWallLocationCurve = sideWall.Location as LocationCurve; Curve sideWallCurve = sideWallLocationCurve.Curve; // get the curve that defines the centerline of the wall that hosts the door Wall hostWall = door.Host as Wall; LocationCurve hostWallLocationCurve = hostWall.Location as LocationCurve; Curve hostWallCurve = hostWallLocationCurve.Curve; // find the point of intersection of these two wall curves (intersectionXYZ) // and the position of this point on the wall that hosts the door (intersectionParam) IntersectionResultArray ira = new IntersectionResultArray(); SetComparisonResult scr = sideWallCurve.Intersect(hostWallCurve, out ira); var iter = ira.GetEnumerator(); iter.MoveNext(); IntersectionResult ir = iter.Current as IntersectionResult; XYZ intersectionXYZ = ir.XYZPoint; double intersectionParam = hostWallCurve.Project(intersectionXYZ).Parameter; // find the position of the door in its host wall LocationPoint doorPoint = door.Location as LocationPoint; XYZ doorXYZ = doorPoint.Point; double doorParam = hostWallCurve.Project(doorXYZ).Parameter; // compute the translation vector between the edge of the door closest to the wall and the side face of the wall XYZ translation = null; XYZ doorEdgeXYZ = null; XYZ intersectionOffsetXYZ = null; if (intersectionParam > doorParam) { intersectionOffsetXYZ = hostWallCurve.Evaluate(intersectionParam - doorToWallDistance - sideWallWidth/2, false); doorEdgeXYZ = hostWallCurve.Evaluate(doorParam + doorWidth/2, false); translation = intersectionOffsetXYZ.Subtract(doorEdgeXYZ); } else { intersectionOffsetXYZ = hostWallCurve.Evaluate(intersectionParam + doorToWallDistance + sideWallWidth/2, false); doorEdgeXYZ = hostWallCurve.Evaluate(doorParam - doorWidth/2, false); translation = doorEdgeXYZ.Subtract(intersectionOffsetXYZ).Negate(); } // Move the door using (Transaction t = new Transaction(doc,"move door")) { t.Start(); ElementTransformUtils.MoveElement(doc,door.Id,translation); t.Commit(); } } } catch{} }

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