Line.Direction property

Anonymous — Mon, 12 Mar 2012 11:30:02 GMT

Hi,

Line.Direction Property Returns the direction of the line as XYZ(sinA,cosA, 0) (in 2D). A is the angle between the line and the north (I think so but I m not sure). My question is : what is exactly the line direction in Revit API ?.

Re: Line.Direction property

jeremytammik — Tue, 13 Mar 2012 09:46:48 GMT

Dear Habib,

I do not quite see the sense or purpose of your question, but here goes anyway:

A line is a geometric concept connecting two points. You can consider one the start and the other the end point.

If you keep track of this difference, you in fact have a directed line.

In Revit, the start and end points are distinguished by their index, which is 0 for the start and 1 for the end point.

I would consider the direction of a directed line to be the vector from the start to the end point, possibly normalised, e.g. for a Revit API Line object instance L:

XYZ startPoint = L.get_EndPoint( 0 );
XYZ endPoint = L.get_EndPoint( 1 );
XYZ direction = (endPoint - startPoint).Normal;

I hope this helps.

Best regards,

Jeremy
--
Jeremy Tammik
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topic Line.Direction property in Revit API Forum

Line.Direction property

Re: Line.Direction property