obtaining a line from a circle, arc or polygon

Discussion in 'AutoCAD' started by cmedinag, Mar 4, 2005.

  1. cmedinag

    cmedinag Guest

    i know autocad draws based on lines, i want to select a line that is part of a polygon, a circle or an arc, so my program can recognize it as a line and start working with it.. any ideas?
     
    cmedinag, Mar 4, 2005
    #1
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  2. cmedinag

    Jeff Mishler Guest

    HUH?
     
    Jeff Mishler, Mar 5, 2005
    #2
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  3. The lines that make up circles are only on the screen. If you do a REGEN
    and your VIEWRES is set high enough, the lines disappear and you see a
    smooth circle. The circles are not based on lines. But here's a subroutine
    to break a circle or arc into segments. I don't think there's any
    reasonable way to get the lines that ACAD uses to draw coarse circles.

    Code:
    http://groups-beta.google.com/group/autodesk.autocad.customization.vba/browse_frm/thread/537f791adee0000/1f05a10ee4b9bc89
    

    of a polygon, a circle or an arc, so my program can recognize it as a line
    and start working with it.. any ideas?
     
    James Belshan, Mar 5, 2005
    #3
  4. cmedinag

    Paul Turvill Guest

    No, AutoCAD isn't "based on lines." In addition to LINE objects, it also
    uses ARCs, CIRCLEs, Polylines, LWPolylines, SPLINES, and ELLIPSES, all of
    which are accurate mathematical representations. If you want to work with a
    circle or arc, you must be ready to deal with a true circle or arc, not a
    "line."
    ___
     
    Paul Turvill, Mar 5, 2005
    #4
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