Make Circle As Polyline

[MR MAN]

Is There Any Way To Make Circle As Polyline So I Can Make It With Width I Need?

[tzframpton]

Don't do that... just start the POLYLINE command, then type A for Arc. when you do that, you can create a circle by simply using your POLAR tracking to make two "arcs". The width should be self explanatory after that.

[eldon]

Or go for a Donut, which is a polyline circle with width

[MR MAN]

Thanks Guys For Your Help

[profcad]

Use the BOUNDARY command and pick a point inside the circle. AutoCAD will create a polyline on top of the circle.

[BOB'27T]

Here's another option Adding global width to a circle

Here's a little trick I learned a while back. I needed to add thickness to a circle & found a slick way to do it. Here goes: Start by making a polygon with 4 sides. Check inscribed in circle when prompted. Next specify your radius. That will create a square. Then select polyline edit, then select fit, then width. Tah Dah! You have a circle with a global width!

[mugshot]

start w/ polyline, set width. w ( upon your choice) then arc.

[mugshot]

or make a polyline that is set upon a width then matchprop the line to your created circle.

[bonehead411]

Use the BOUNDARY command and pick a point inside the circle. AutoCAD will create a polyline on top of the circle.

 

Oh now that's a beauty! Cheers prof.

[270]

I agree with Bonehead, I prefer the method that profcad offered.  Thanks profcad.

 

[BIGAL]

If you did a bit of searching here you would have found a circle with a width and a smart offset.

 

 

circle - donut.lsp

getval2.lsp

[rkent]

I use one by Jason Piercey

 

;Written By: Jason Piercey 07.31.01
;Revised: 01.16.02 To handle multiple selection

(defun C:Circle2Pline (/ CirEnt    CirElst   CirCen    CirRad
                         CirLay    CirLin    CirClr    CirLts
                         PlineEnt  ss        i)

  (setq ss (ssget '((0 . "CIRCLE"))))
  (if ss
    (progn
      (setq i 0)
      (repeat (sslength ss)
        (setq CirEnt (ssname ss i)
              CirElst (entget CirEnt)
              CirCen  (cdr (assoc 10 CirElst))
              CirRad  (cdr (assoc 40 CirElst))
              CirLay  (cdr (assoc  8 CirElst))
              CirLin  (cdr (assoc  6 CirElst))
              CirClr  (cdr (assoc 62 CirElst))
              CirLts  (cdr (assoc 48 CirElst))
              )

        (setq PlineEnt (list '(0 . "LWPOLYLINE")
                             '(100 . "AcDbEntity")
                             (cons 8 CirLay)
                             '(100 . "AcDbPolyline")
                             '(90 . 2)
                             '(70 . 1)
                             '(43 . 0.0)
                             '(38 . 0.0)
                             '(39 . 0.0)
                             (cons 10 (polar CirCen (* pi) CirRad))
                             '(40 . 0.0)
                             '(41 . 0.0)
                             '(42 . 1.0)
                             (cons 10 (polar CirCen (* pi 2.0) CirRad))
                             '(40 . 0.0)
                             '(41 . 0.0)
                             '(42 . 1.0)
                             '(210 0.0 0.0 1.0)
                             )
              )

        (if CirLin (setq PlineEnt (append PlineEnt (list (cons 6
CirLin)))))
        (if CirClr (setq PlineEnt (append PlineEnt (list (cons 62
CirClr)))))
        (if CirLts (setq PlineEnt (append PlineEnt (list (cons 48
CirLts)))))
        (entmake PlineEnt)
        (entdel CirEnt)
        (setq i (1+ i))
        )
      )
    )
  (princ (strcat "\n"(itoa i) " Circles converted to LwPolylines"))
  (princ)
  )

 

Circle2Pline.lsp

[rkmcswain]

I did not see this listed, but another alternative would be to draw a polygon with a lot (say 500?) sides. 

It won't be a true arc or circle obviously, but there may be a case where you need line segments that look like a circle (example: XCLIP)