topic Offset Multiple in Revit API Forum

Offset Multiple

LandformX — Tue, 23 Mar 2021 14:55:45 GMT

Hi guys,

what's the best way to offset a line multiple times? I'm struggling to do it ;/

for(int i = 0; i < (numberOfOffset); i++ ) { XYZ normal = XYZ.BasisZ; Curve newLine = LongLine.CreateOffset(2000, normal); doc.Create.NewDetailCurve(doc.ActiveView, newLine); }

basically i need an array of lines

Thanks in advance.

Re: Offset Multiple

jeremy_tammik — Tue, 23 Mar 2021 15:14:23 GMT

That looks perfectly fine to me.

Re: Offset Multiple

RPTHOMAS108 — Tue, 23 Mar 2021 16:06:25 GMT

You are offsetting by 610m since internal units are ft.

Re: Offset Multiple

jeremy_tammik — Tue, 23 Mar 2021 16:09:21 GMT

Wow, very perceptive reading and guesswork!

Re: Offset Multiple

LandformX — Tue, 23 Mar 2021 16:19:47 GMT

Thank you @RPTHOMAS108 ,

double offset = UnitUtils.ConvertToInternalUnits(2000, DisplayUnitType.DUT_MILLIMETERS);

I converted it, but the problem is the lines stays in the same position

Re: Offset Multiple

RPTHOMAS108 — Tue, 23 Mar 2021 16:42:34 GMT

I can't see from that what is wrong where is LongLine? Was you offsetting 2m from the adjacent wall (this looks about 2m judging from door)?

If you want cumulative offset for each iteration of your loop then you need to multiply distance by iteration or add it to running total each time (not just keep offsetting same distance from same line).

Thanks @jeremy_tammik as internal units are not metric I don't expect them to be rounded so nicely.

Re: Offset Multiple

LandformX — Tue, 23 Mar 2021 16:43:50 GMT

Yes the offset will start from long line, and yes I guess that's what I need, cumulative distance, sorry for ignorance but that's where I'm failing, would you mind giving an example? Thanks

Re: Offset Multiple

RPTHOMAS108 — Tue, 23 Mar 2021 17:12:31 GMT

It is also worth mentioning that your offset direction is going to be based on the direction of the line being offset. So for some instances you may have to either use (0,0,-1) rather than BasisZ or multiply offset value by -1 to get the direction of offset you want.

Dim Offset as Double = 304.8 For I = 1 to NumberOfOffsets Dim Total = I * Offset Dim NxtLine = LongLine.CreateOffset(Total, XYZ.BasisZ) ... Next

Dim Offset as Double = 304.8 Dim Total as double = 0 For I = 0 to NumberOfOffsets - 1 Total += Offset Dim NxtLine = LongLine.CreateOffset(Total, XYZ.BasisZ) ... Next