`Wire_obj ^ 2` should throw an error, I think

[KilowattSynthesis]

My understanding is that the caret operator, which is an overload for Wire.location_at() (or any other object which inherits from Mixin1D), accepts an argument where 0 <= distance <= 1 when position_mode = PositionMode.PARAMETER (the default).

If this is true, calling the caret operator with a 2nd-operand greater than 1 should be invalid, and should raise an error instead of acting silently.

This will help people's understanding of what the function does, and may help catch bugs as well.

[gumyr]

No. Although normally u, v values have the range of 0.0 - 1.0 one can legitimately use values outside of this range as the underlying curve object is valid beyond these end points.

[KilowattSynthesis]

Maybe this is a documentation request then, which explains how that works.

What happens when one does polyline ^ 2? Does it just extend the closest-to-the-end line segment?

[gumyr]

Let's try and find out:

from build123d import *
from ocp_vscode import show_all

path1 = Polyline((0, 1, 0), (4, 1, 0), (4, 4, 0))
p1 = path1 ^ -1
p2 = path1 ^ 2

path2 = Spline((-2, 6), (0, 2), (2, 6))
p3 = path2 @ -1
p4 = path2 @ 2

show_all()

Within the kernel all lines are represented by an OCCT Geom_Curve which is "trimmed" to a given start and end point. When a user asks for u values outside of 0.0-1.0 they are simply requesting values on the base Geom_Curve.

Maybe a user would like to align text to a line and it goes a little off one or both ends - allowing values outside of the 0.0 to 1.0 range enables this. I don't recommend users do this unless they understand what they are doing though.

[KilowattSynthesis]

Thanks, I think that's a helpful example. Would be awesome to be able to create a similar clear example that could go in the docs!