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;;;
;; @file      exp-SwirlyGraph.lisp
;; @author    Mitch Richling <https://www.mitchr.me>
;; @brief     Draw a nice and swirly image.@EOL
;; @std       Common Lisp
;; @copyright 
;;  @parblock
;;  Copyright (c) 1997,2008,2010,2012,2015, Mitchell Jay Richling <https://www.mitchr.me> All rights reserved.
;;
;;  Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
;;
;;  1. Redistributions of source code must retain the above copyright notice, this list of conditions, and the following disclaimer.
;;
;;  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions, and the following disclaimer in the documentation
;;     and/or other materials provided with the distribution.
;;
;;  3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software
;;     without specific prior written permission.
;;
;;  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;;  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
;;  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
;;  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
;;  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
;;  DAMAGE.
;;  @endparblock
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(let ((swirl-data (mjr_dquad_add-data-from-map (mjr_dquad_make-from-axis  "x" '(:start -16 :end 16 :len 500)
                                                                          "y" '(:start -16 :end 16 :len 500))
                                               (lambda (x y)
                                                 (let* ((n 8)
                                                        (r  (sqrt (+ (* x x) (* y y))))
                                                        (th (atan y x)))
                                                   (sin (+ (* n (cos r)) (* 5 th)))))
                                               :axes 't
                                               :ano-nam "swirlyField"
                                               :ano-typ :ano-typ-real)))

  (mjr_gnupl_dquad swirl-data :type :i)
  (time (mjr_vtk_from-dquad "exp-SwirlyGraph-OUT.vtk" swirl-data)))