(import "oo.slime")

(define-package math

  (define pi 3.14159265)

  (define (abs x)
    (if (> x 0) x (- x)))

  (define (sqrt x)
    (** x 0.5))

  ;; (define-class vector3 (x y z)
  ;;   (define (get-x) x)
  ;;   (define (get-y) y)
  ;;   (define (get-z) z)

  ;;   (define (set-x new-x) (mutate x new-x))
  ;;   (define (set-y new-y) (mutate y new-y))
  ;;   (define (set-z new-z) (mutate z new-z))

  ;;   (define (length)
  ;;     (** (+ (* x x) (* y y) (* z z)) 0.5))

  ;;   (define (scale fac)
  ;;     (mutate x (* fac x))
  ;;     (mutate y (* fac y))
  ;;     (mutate z (* fac z))
  ;;     fac)

  ;;   (define (add other)
  ;;     (make-vector3
  ;;      (+ x (other get-x))
  ;;      (+ y (other get-y))
  ;;      (+ z (other get-z))))

  ;;   (define (subtract other)
  ;;     (make-vector3
  ;;      (- x (other get-x))
  ;;      (- y (other get-y))
  ;;      (- z (other get-z))))

  ;;   (define (scalar-product other)
  ;;     (+ (* x (other get-x))
  ;;        (* y (other get-y))
  ;;        (* z (other get-z))))

  ;;   (define (cross-product other)
  ;;     (make-vector3
  ;;      (- (* y (other get-z)) (* z (other get-y)))
  ;;      (- (* z (other get-x)) (* x (other get-z)))
  ;;      (- (* x (other get-y)) (* y (other get-x)))))

  ;;   (define (print)
  ;;     (printf :sep "" "[vector3] (" x  y  z ")"))
  ;;   )
)