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(provide "tour")
(defun sphere-rand (n)
(loop (let* ((x (- (* 2 (uniform-rand n)) 1))
(nx2 (sum (^ x 2))))
(if (< nx2 1) (return (/ x (sqrt nx2)))))))
(defun tour-plot (&rest args)
(let ((p (apply #'spin-plot args)))
(send p :add-slot 'tour-count -1)
(send p :add-slot 'tour-trans nil)
(defmeth p :do-idle () (send self :tour-step))
(defmeth p :tour-step ()
(when (< (slot-value 'tour-count) 0)
(let ((vars (send self :num-variables))
(angle (abs (send self :angle))))
(setf (slot-value 'tour-count)
(random (floor (/ pi (* 2 angle)))))
(setf (slot-value 'tour-trans)
(make-rotation (sphere-rand vars)
(sphere-rand vars)
angle))))
(send self :apply-transformation (slot-value 'tour-trans))
(setf (slot-value 'tour-count) (- (slot-value 'tour-count) 1)))
(defmeth p :tour-on (&rest args) (apply #'send self :idle-on args))
(let ((item (send graph-item-proto :new "Touring" p
:tour-on :tour-on :toggle t)))
(send item :key #\T)
(send (send p :menu) :append-items item))
p))
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