Examples/tour.lsp

   1 (provide "tour")
   2
   3 (defun sphere-rand (n)
   4   (loop (let* ((x (- (* 2 (uniform-rand n)) 1))
   5                (nx2 (sum (^ x 2))))
   6           (if (< nx2 1) (return (/ x (sqrt nx2)))))))
   7
   8
   9 (defun tour-plot (&rest args)
  10   (let ((p (apply #'spin-plot args)))
  11     (send p :add-slot 'tour-count -1)
  12     (send p :add-slot 'tour-trans nil)
  13     (defmeth p :do-idle () (send self :tour-step))
  14     (defmeth p :tour-step ()
  15       (when (< (slot-value 'tour-count) 0)
  16             (let ((vars (send self :num-variables))
  17                   (angle (abs (send self :angle))))
  18               (setf (slot-value 'tour-count)
  19                     (random (floor (/ pi (* 2 angle)))))
  20               (setf (slot-value 'tour-trans)
  21                     (make-rotation (sphere-rand vars)
  22                                    (sphere-rand vars)
  23                                    angle))))
  24       (send self :apply-transformation (slot-value 'tour-trans))
  25       (setf (slot-value 'tour-count) (- (slot-value 'tour-count) 1)))
  26     (defmeth p :tour-on (&rest args) (apply #'send self :idle-on args))
  27     (let ((item (send graph-item-proto :new "Touring" p
  28                       :tour-on :tour-on :toggle t)))
  29       (send item :key #\T)
  30       (send (send p :menu) :append-items item))
  31     p))
  32