Break circle without deleting arc?

Jim Canale

I used Autocad LT for years.  The break command would break a circle, arc, or other object with or without removing any segments.   Suppose for instance, that you wanted to change the line properties for part of that object.  I.E. a dashed line for part of an arc, whereas the rest of the arc still was continuous.   There seems to be no easy way to do this in BricsCAD.  It always removes a segment.

Comments?

martin@enco.us

I'd look at the Circle Break lisp routine at www.lee-mac.com

Robt Deans

Workaround, use PEDIT on the circle?

Jim Canale

Thanks for the ideas.    I considered using PEDIT, but I'd want to turn it back into an arc after I am done.   Is that even possible?

The LISP file may be the way to go.  Haven't even tried LISP yet on BricsCAD.  Never used to work very good on my Intellicad installation. 

Robt Deans

CircleBreakV1-3.lsp routine as suggested by H Martin works as advertised (on v14).

Both broken segments maintain arc properties.

Hans De Backer

To break an arc in two keeping both parts:

start the BREAK command
select the arc
Enter "F"    ( to indicate you want to specify a First point that is different from the location where you happened to pick the arc)
and select the desired break point, twice    (as First and Second point)

That's it,
kind regards.

Greg Skelhorn

@Hans De Backer:

To break an arc in two keeping both parts:

start the BREAK command
select the arc
Enter "F"    ( to indicate you want to specify a First point that is different from the location where you happened to pick the arc)
and select the desired break point, twice    (as First and Second point)

When I try I get this:
[code]
: br
Select entity to break:
First break point/: f
First break point: _quadrant
Snap to _quadrant of:
Second break point: _quadrant
Snap to _quadrant of:
Distinct points are needed to break this entity.
[/code]

Greg Skelhorn

@Hans: I was trying a circle but now I see you said an arc.

@Greg Skelhorn:

When I try I get this:

: brSelect entity to break:First break point/: fFirst break point: _quadrantSnap to _quadrant of:Second break point: _quadrantSnap to _quadrant of:Distinct points are needed to break this entity.    

Anthony Apostolaros

If you convert a circle to a polyline and then explode it, you're left with 2 arcs -- a top arc and a bottom arc. If you select both arcs, you can drag the left and right endpoints of those arcs to the points on the circle where you wanted it broken. So you don't actually use the BREAK command, just PEDIT and EXPLODE, plus the responses, and the dragging. For someone who often breaks circles that could all be combined into a single command with no responses.

Lee Mac's CircleBreak lisp routine breaks a circle into two arcs with just a single command and two pick points. It also changes the properties of one of the two arcs, which is usually the reason you wanted the circle broken. But the new properties have to be embedded in the lisp code.