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;;;; turtle-system.lisp
(in-package #:l-system)
;;;(matrix* translate rotate scale)
(export '(f j + - & ^ q / [ ]))
(defvar coor-sys (identity-matrix))
(defvar stack '())
(defun turtle-system (fn list)
(iter (for item in list)
(case (car item)
;;Move forward one unit,adding data to mesh.
((f)
(setf coor-sys (mtranslate coor-sys
(vec* (vec 0.0 1.0 0.0)
(cadr item))))
(appending (funcall fn coor-sys)))
;;Move forward one unit,without adding data to mesh.
((j)
(setf coor-sys (mtranslate coor-sys
(vec* (vec 0.0 1.0 0.0)
(cadr item)))))
;;Rotate left on axis z
((+)
(setf coor-sys (mrotate
(get-axis coor-sys 2)
coor-sys
(cadr item))))
;;Rotate right on axis z
((-)
(setf coor-sys (mrotate
(get-axis coor-sys 2)
coor-sys
(- (cadr item)))))
;;Rotate left on axis y
((&)
(setf coor-sys (mrotate
(get-axis coor-sys 1)
coor-sys
(cadr item))))
;;Rotate right on axis y
((^)
(setf coor-sys (mrotate
(get-axis coor-sys 1)
coor-sys
(- (cadr item)))))
;;Rotate left on axis x
((q)
(setf coor-sys (mrotate
(get-axis coor-sys 0)
coor-sys
(cadr item))))
;;Rotate right on axis x
((/)
(setf coor-sys (mrotate
(get-axis coor-sys 0)
coor-sys
(- (cadr item)))))
;;Push the current turtle state onto a stack
(([)
(push (copy-seq coor-sys)
stack))
;;Pop the turtle stack, restoring an earlier state
((])
(setf coor-sys (pop stack))))
(finally (init))))
;;; Turgle utils
(defun init ()
(setf coor-sys (identity-matrix)
stack '()))
(defun list-of-vectors->list (list-of-vectors)
(iterconcat #'(lambda (vec)
(concatenate 'list
vec))
list-of-vectors))
(defun mtranslate (matrix vec)
(matrix* matrix
(translate vec)))
(defun mrotate (axis matrix radians)
(matrix* matrix
(rotate-around axis radians)))
(defun get-axis (matrix column)
(vec (mref matrix 0 column)
(mref matrix 1 column)
(mref matrix 2 column)))
(defun get-vec (matrix)
(transform-point (vec 0.0 0.0 0.0)
matrix))
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