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define arc by center, radius and sweep angle?

rickford66

Running Eagle 6.5.0. Is there any way to define an arc by the center, radius and sweep angle?  This business of defining it by the end points and the curve is a pain in the neck.

Thanks.

  • Am 10.12.2013 17:27, schrieb rickford66:

    Running Eagle 6.5.0. Is there any way to define an arc by the center,

    radius and sweep angle?  This business of defining it by the end points

    and the curve is a pain in the neck.

    Thanks.

     

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    Hi,

     

    no sorry.  starting point --- radius or curve  --- ending point.

    Maybe in some situations helps cmd-draw.ulp can help.

     

     

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  • On 11/12/2013 5:27 a.m., rickford66 wrote:

    Running Eagle 6.5.0. Is there any way to define an arc by the center,

    radius and sweep angle?  This business of defining it by the end points

    and the curve is a pain in the neck.

    Thanks.

     

    There a few approaches to achieving an arc.  I find the arc tool odd as

    it uses the diameter and that point is difficult to determine often.

     

    Other methods:

     

    Draw a straight line from arc start to arc end.

    Then, select the MOVE tool, hold down the CTL key and click the centre

    of the line and pull out an arc.

     

    Draw a straight line from arc start to arc end.

    Select INFORMATION for the line and change the curve to the number of

    degrees

     

    Place a MARK at your centre and using polar notation, in the command

    line define your arc

    wire  (P 0.36 45) @+0.36 (P 0.36 90) ;

    draws an arc with radius of 0.36 units sweeping 45 to 90 degrees

     

    You could create a ULP that prompted for radius, start and end angles.

    The centre of the drawn arc would be the editor origin or the place you

    previously placed a MARK.

     

    HTH

    Warren

     

     

     

     

     

     

     

     

  • in reply to autodeskguest

    Place a MARK at your centre and using polar notation, in the command

    line define your arc

    wire  (P 0.36 45) @+0.36 (P 0.36 90) ;

    draws an arc with radius of 0.36 units sweeping 45 to 90 degrees

     

     

    This looks the most promising.  I'll have to try it when I get some time.  As for the problem I had, I had to draw a number of concentric "almost" circles centered about the origin.  I was reduced to using trig to compute the end points on paper, then entering the info.  It was a royal pain.  Thanks for the idea.