Topic: Offsetting a line?

[hudster]

How do I set up a lisp so i can offset a line 5mm on each side of the line?

I can get Lisp to draw the line no problem, but I can't figure out how to offset it.

[SMadsen]

Hint: if p1 and p2 are points of the line then (setq angle90 (+ (angle p1 p2) (/ pi 2.0))) will be an angle perpendicular to the line.

If ^that's the case then which point would (polar p1 angle90 5.0) return?

[hyposmurf]

Cant offer you a solution but I reckon I know why you want it! Is it for showing pipework/circuit lines that cross each other but dont actually intersect?Would be dam helpful if there was such a lisp.

[hudster]

ahhh a building services man, that's exactly what it's for.

But i'm also hoping to alter it so as to create a lisp that will automatically create a ceiling grid.

[CAB]

Use the Offset Method

The distance to offset the object. The offset can be a positive or negative number, but it cannot equal zero. If the offset is negative, this is interpreted as being an offset to make a "smaller" curve (that is, for an arc it would offset to a radius that is "Distance less" than the starting curve's radius). If "smaller" has no meaning, then it would offset in the direction of smaller X, Y, and Z WCS coordinates.

This way you don't have to pick a side, just use a POSITIVE VALUE  and
then a NEGATIVE VALUE  for the offset distance.

If you want it explaned further perhaps the person who educated me on that
will offer.    S.M.

[SMadsen]

Aww man, that's too easy

[hyposmurf]

ahhh a building services man, that's exactly what it's for.

You guessed right to

[hyposmurf]

This thread seems to have answered the question asked.

[Jürg Menzi]

Hi Hudster

Visit my homepage -> Free Stuff -> Free Programs and search for 'MultiOffset'

Cheers