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  1. #1
    Senior Member vanowm's Avatar
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    Question Arc with START, END, CENTER points?

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    Hello.

    I'm using Autocad 2000i/2002 and looking for a way to draw an arc by using this order of points:
    1. START
    2. END
    3. CENTER (bulge)

    The available START END DIRECTION version is very close to what I'm looking for, except it doesn't allow me snap the center arch to an object, because the arc doesn't "tide up" to the cursor.
    I think 3-point circle closer to what I'm looking for then any available built-in versions of arc.

    Any ideas? Thank you.
    AutoCAD 2002 / R13

  2. #2
    Luminous Being
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    Are you trying to drag the radius to something that looks good ? Just do a standard pick 3 pts Start mid end then click centre grip and move radius changes.
    A man who never made mistakes never made anything

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    Luminous Being RobDraw's Avatar
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    What does "tide up" mean in this context?
    Last edited by RobDraw; 19th Jul 2015 at 03:43 pm.
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    Perhaps you could define your "technical" terms with the aid of some diagrams.

    We may know how to help you, but are presently baffled by your description.

    As I read your request, I would ask are your points geometrically compatible? The Centre of an arc lies on the perpendicular bisector of the Start and End points. But there again, I may not have grasped your meaning.

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    Super Member Commandobill's Avatar
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    Polyline arc, or normal arc?
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  6. #6
    Senior Member vanowm's Avatar
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    Quote Originally Posted by eldon View Post
    Perhaps you could define your "technical" terms with the aid of some diagrams.

    We may know how to help you, but are presently baffled by your description.

    As I read your request, I would ask are your points geometrically compatible? The Centre of an arc lies on the perpendicular bisector of the Start and End points. But there again, I may not have grasped your meaning.
    Quote Originally Posted by RobDraw View Post
    What does "tide up" mean in this context?
    What I meant was the preview of the arc is "attached" to the cursor, unlike to an arbitrary line as in
    Code:
    (command "_arc" pause "_e" pause "_d")
    What I'm looking for is similar to Lee Mac 3-point circle


    So I guess "center" wasn't a proper word for it, perhaps bulge is more appropriate?

    Quote Originally Posted by Commandobill View Post
    Polyline arc, or normal arc?
    Doesn't matter I guess.
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    AutoCAD 2002 / R13

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    Luminous Being
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    Using a program you can do dynamic stuff like dragging a circle, I think you need to post an exact image of what it is you want it does not matter if you draw multiple arcs.

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  8. #8
    Senior Member vanowm's Avatar
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    Ok, draw an arc, now click on it and grab the middle grip, start dragging it around - that is exactly what I'm looking for during the initial creation of an arc after start and end points are set.

    Hopefully this is clear now
    AutoCAD 2002 / R13

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    Luminous Being
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    Why can you not do that now using MID and MOVE I think we are still missing something. I used copy for the image the line implies the copy direction but its still out of the box methods. Its a case of putting together a lisp that makes the arc and then uses the mid point as snap point can be done is this what your trying to do just remove the couple of manual steps. Please let us know.

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  10. #10
    Senior Member vanowm's Avatar
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    No, I'm not trying move the entire arc. In my last example clicking on the arc is necessary to bring up the grips, the grip in the middle you'd use to drag around to change shape of the arc.

    So, yes, creating a temporary arc after user submitted start and end points and then use stretch on the middle of the arc for the third point would work, except my lisp knowledge is limited to achieve that, that's why I asked if such solution already available...
    AutoCAD 2002 / R13

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