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jihan barbara (Author)

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Click to Run Model

globals [radius]

to setup
  clear-all
  set radius max-pxcor - 2
  ;; make 12 turtles, equally spaced in heading
  create-ordered-turtles 12 [
    ;; move to edge of circle
    fd radius
    ;; turn to face clockwise
    rt 90
    ;; bigger turtles are easier to see
    set size 3
    ;; thicker line is easier to see
    set pen-size 3
    ;; leave a trail
    pen-down
    ]
end 

to go-distance
  ask turtles [ arc-forward-by-dist step-size ]
  tick
end 

to arc-forward-by-dist [dist]  ;; turtle procedure
  ;; calculate how much of an angle we'll be turning through
  ;; (essentially converting radians to degrees)
  let theta dist * 180 / (pi * radius)
  ;; turn to face the next point we're going to
  rt theta / 2
  ;; go there
  fd dist
  ;; turn to face tangent to the circle
  rt theta / 2
end

There is only one version of this model, created over 13 years ago by jihan barbara.

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