Convert polyline segment to arc

[LeGaulois (Charles Collin)]

Hi there,

Is there a way to convert a segment of a polyline into arc ? I draw polyline alot and further need to “rafine”/adjust them.

Thanks,
CC

[René_Corella]

@LeGaulois

a way to convert a segment of a polyline into arc ?

Are you referring to an “automatic” conversion or a manual approach? I know the convert command has an ‘arc’ output option, but it won’t work on a line. For the latter, you can Ctrl+Shift select the segment, use the ExtractSubCrv command, delete it, and draw the arc between the now-open profile extremities.

[LeGaulois (Charles Collin)]

@René_Corella,

Yes I’m doing it manually actually. I was wondering if there is an easier way. Especially if I want to keep tangency (in my example its easy, but in some situations with non-parallel lines, it add an extra step).

thanks
CC.

[Helvetosaur]

@René_Corella

For the latter, you can Ctrl+Shift select the segment, use the ExtractSubCrv command, delete it, and draw the arc between the now-open profile extremities.

Just Ctrl+Shift+Pick a polyline or polycurve segment and hit the delete button is enough - no need to use ExtractSubCrv.

@LeGaulois

Yes I’m doing it manually actually. I was wondering if there is an easier way. Especially if I want to keep tangency (in my example its easy, but in some situations with non-parallel lines, it add an extra step).

Arc Start/End/Direction at start might help, or perhaps Extend>By Arc… But there is no direct curve end-to-curve end tangent arc solution for many situations, the end of one curve or the other will need to be trimmed to keep tangency at both ends. That’s called a Fillet.

[Helvetosaur]

You could also use Arc Tangent Tangent to create a tangent arc between the two sides you want and use that to trim away the parts you don’t want to keep.

[René_Corella]

@Helvetosaur

hit the delete button is enough

true, thanks - I think the segment extraction part was a burned-in thought I meant to discard.

[René_Corella]

@LeGaulois

if I want to keep tangency (in my example its easy, but in some situations with non-parallel lines, it add an extra step).

completely - by the way is there a commonality between the polylines you draft? I suppose the segment selection is not arbitrary and something could be scripted.

[LeGaulois (Charles Collin)]

@René_Corella , thanks for the help. Definitively something scripted could solve this.I will wait to see if this convertion is frequent enough in my workflow so I script it. Still need to learn more about macros ;).

CC