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Topic Closedcurvilinear polyline
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max-cad View Drop Down
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Joined: 15.Feb.2012
Location: Italy
Using: Autocad 2004
Status: Offline
Points: 1 		Direct Link To This Post Topic: curvilinear polyline
    Posted: 15.Feb.2012 at 16:44
Hi, I'm new here.

Often I have to make a closed polygon with curvy angles, for instance including part of a circle. I always make small straight lines to simulate a curve, but the result is not really good. Is there a trick to make curvy lines?

thanks
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John Connor View Drop Down
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Joined: 01.Feb.2011
Location: United States
Using: AutoCAD 2018
Status: Offline
Points: 7175 		Direct Link To This Post Posted: 15.Feb.2012 at 18:32
You could try using the SPLINE command.

You could use a series of connected polylines then fit a curve to them or a spline using the PEDIT command and the appropriate option either FIT or SPLINE.

You could use the SKETCH command but be forewarned that this command uses a series of small lines (you control the length).  I've seen AutoCAD actually crash when someone got carried away using this command.  Use at your own peril.
"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance."

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heinsite View Drop Down
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Joined: 05.Feb.2009
Location: United States
Using: AutoCAD 2014
Status: Offline
Points: 640 		Direct Link To This Post Posted: 15.Feb.2012 at 23:15
The "trick" is learning how to create arcs within the basic polyline command.  In general, you need to work counter clockwise.  But depending on how complex your polygon is going to be you may also help yourself out by drawing a few guide lines for directions or angles, or even radii.
 
You could also draw your figure with basic lines and arcs and then convert that into a polyline after it's complete.  That might be the easiest route.  Sometimes trying to do something complicated with the polyline command can get out of hand in a hurry.
 
Dave.
Dave Hein, P.E.
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Kona International Airport
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