Posted by Yuriy Skvortsov on
URL: https://forum.librecad.org/Snapping-on-help-layer-tp5693986p5694928.html

I know that a help layer should have lines of infinite length but the thing is that they are just drawn as infinite but in fact they are finite.
Steps to produce:
Create new file
Create layer "Help" with "help" option checked (gray printer icon in layer list)
Toolbar "Lines" -> Vertical lines -> in properties fields select Length=5, Snap Point=middle (yes, that should not have effect on help layer but it has) -> click on (0,0) point (Snap on grid on)
(Now we have a vertical line which looks like an infinite. Still if we click on printer icon in layer list (deactivate help option) we can see that in fact the line length is 5)
Ok, still in help mode on Toolbar "Lines" -> Parallels with distance -> in properties field Distance=30 -> try to snap to the first line (all snap modes off) in different points
We can see that snapping works inside a region (0,-10)..(0,10) but does not work outside of it.
Same things happens if you create a grid of lines in a help layer and then try to snap crossections of them - snap crossection works in some surrounding of actual line positions but fails to snap the far crossections.