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⚠️ Libfredo 15.4b | Minor release with bugfixes and improvements Update

Ruby script to rotate a shape using a arc

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  • W Offline
    wsellers89
    last edited by 4 Aug 2010, 19:32

    Sorry to ask such an elementary question, and I hope that this is the right forum. I am working my way through ruby scripting and wanted to rotate a simple surface such as a rectangle to form half a cylinder. It is extremely important that the edges of the cylinder match up with the x-axis, so I used an arc going from 0 to 90 degrees. When the script rotates the rectangle it does something strange in that it appears to over rotate (look near the origin). The script is as follows:

    # Access the Entities object
    model = Sketchup.active_model
    ents = model.entities
    
    # Create the 2-D shape
    curve = ents.add_curve [5, 0, 0], [15, 0, 0],
    [15, 0, 10], [5, 0, 10], [5, 0, 0]
    curve_face = ents.add_face curve
    
    # Create the arc path
    path = ents.add_arc [0, 0, 0], [0, 0, 1], [1, 0, 0], 5, 0.0, 180.degrees
    
    # Create the figure
    curve_face.followme path
    

    and I will attach an image of what resulted. I do know that if I draw a rectangle on the x-axis and intersect with the rotated object it does line up, but why the strange behavior? Am I missing something simple?

    Sincerely,
    Bill


    Rotated rectangle.  Rectangle is 10 units long and 10 units high starting at x= 5

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    • T Offline
      TIG Moderator
      last edited by 4 Aug 2010, 21:11

      Followme needs careful configuration to make a proper form...
      Why not make the face arc + two radii and pushpull it?

      TIG

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      • W Offline
        wsellers89
        last edited by 4 Aug 2010, 22:03

        Dear TIG,

        Because what I was ultimately heading toward was the ability to take a complicated profile (Versus a rectangle) and rotate it exactly 180 degrees. The profile could be something like a cross section of a rocket launcher or a cross section of a jet engine, which wouldn't work well with the Push/Pull.

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        • T Offline
          TIG Moderator
          last edited by 4 Aug 2010, 23:10

          Followme for such fixed rotations like this will often fail and the resulting form won't be 'square' as desired - however, see my ExtrudeEdgesByLathe tool [in Extrusion Tools zip] - It takes the profile from a face etc and sweeps it properly through a given [picked or typed in] angle: it's probably too complex for your needs... BUT it can give you lots of clues for making a proper 45/90/180/270/360/etc swept form...

          TIG

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          • W Offline
            wsellers89
            last edited by 5 Aug 2010, 01:11

            Wow! Thanks for the help and the education regarding what it takes to make it rotate a precise number of degrees. It was way past my skill level!

            Thank you again.

            Sincerely,
            Bill

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