Hi Petr,

> The third modes might be in reverse order - first pick a full distance
> then offset distance.

I figured that would be closer to that fence tool in LWCAD, by picking the extent last the kind of dynamic action part would be seeing regularly spaced instances of your object appear, with more added as you moved your mouse further.

But I think there is a good possibility here to allow them in either order, I can just get 2 distances and take the smallest as the offset.

I'm thinking of picks similar to Scale1D here - first a base point, then a second point, which then defines an initial line. Then the third point will track along that line.

If the third point goes longer than the original line, the third point becomes an extent, if the third point goes shorter than the original line then the original line is the extent.

- Michael