Trim (new guy, switching from AutoCAD)

(I've checked the Forum and the User's Guide, but no joy.)

I've got a drawing and I've made some tweaks, and I selected Trim Segments from the menu to clean things up. I'm prompted to select the polyline to trim, but I can't select anything, either by clicking on the line or by dragging left or right. I have a 2-button mouse with wheel, and the little action window at the bottom has a green indicator for a middle button. Do I need a 3-button mouse? I feel silly posting such a basic question but I just can't punch past this one. Thanks!

Welcome!

The trim may be a bit unintuive before you get used to it. You have to select limiting boundary, then the part which stays, not the part which is trimmed away.

Can you post the polyline you tried to edit.

I don't think a 3 button mouse would help, 2 buttons and a wheel are most effective way.

Thanks 125,

The arrow shows the bit I'm trying to trim off:



(Hope the image shows; I'm just getting a link.) Thanks for the tip on the mouse.

There are videos for begginers, also about Trim in LibreCAD
https://forum.librecad.org/Tutorial-LibreCAD-Beginner-Level-td5719572.html

HTH
Pere

BTW, if we still get trimming behavior issues in 2.2.2, we will change the trimming API:

Currently, trimming is considering: intersections, and user click position, but not in the same step.

We should change it into a unified API to do trimming in one step, with both set of information.

This is a way to handle complex trimming in the future, like closed curves, or self-intersecting cuves.

perepujal wrote

There are videos for begginers, also about Trim in LibreCAD
https://forum.librecad.org/Tutorial-LibreCAD-Beginner-Level-td5719572.html

HTH
Pere

Isn't Davidry talking of a polyline? Polyline doesn't react to normal trim. So I tried with Tools - Polyline - Trim segments. No response either. But I remembered I once got it to work. With further trials I found out:
You can't just simply click somewhere on an entity, you need to use a snap, like on endpoint, or if you have snap on entity activated, it reacts like normal.