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* Animise
/General purpose tweens and easing/
Animise is a small library that you may use to orchestrate any time-varying
numerical values. While animise is intended to be used as a general purpose
[[https://en.wikipedia.org/wiki/Inbetweening][tweening]] solution for your Common Lisp projects, you could use it for other
purposes as well (e.g. modulating audio signals).
As a taste of the animise language, here is a snip from an [[https://github.com/thegoofist/animise-examples][example]] that
animates a box with SDL2:
(**NOTE**: These gifs are jumpier looking than the "real thing" -
my gif recorder makes chopy gifs I guess :()
#+begin_src lisp
;; ... snip
(let* ((rect (sdl2:make-rect 0 0 100 100))
(color (list 255 0 0 255))
(anim (sequencing (:loop-mode :looping :targeting rect)
(pausing :for 200 :start (sdl2:get-ticks))
(grouping (:with-duration 1200)
(animating :linearly :the 'cadddr :of color :to 0)
(animating :quading-out :the 'sdl2:rect-x :to 400)
(animating :bouncing-out :the 'sdl2:rect-y :to 300))
(grouping (:with-duration 1000)
(animating :linearly :the 'cadddr :of color :to 255)
(animating :elastically-out :the 'sdl2:rect-x :to 0))
(animating :cubically-in-out :the 'sdl2:rect-y :to 0 :for 800))))
;; ... snip
#+end_src
And here is what the above looks like
[[.images/animise-eg-3.gif]]
*** Another example
[[.images/eg1.gif]]
#+begin_src lisp
(let* ((rect (sdl2:make-rect 0 0 100 100))
(dur 2200)
(dur/3 (round (/ dur 3)))
(anim
(sequencing (:loop-mode :looping :targeting rect)
(grouping (:for dur)
;; only the first member of a sequence needs a real start time
(animating :elastically-out :starting (sdl2:get-ticks) :the 'sdl2:rect-x :to 500)
(animating :quading-out :the 'sdl2:rect-height :to 20)
(animating :quading-out :the 'sdl2:rect-width :to 20))
(grouping (:for dur)
(animating :quading-out :the 'sdl2:rect-width :to 100)
(animating :quading-out :the 'sdl2:rect-height :to 100)
(animating :bouncing-out :the 'sdl2:rect-x :to 0))))
(other-anim
(sequencing (:targeting rect :loop-mode :looping)
;; again, first member of a sequence
(animating :quading-in-out :the 'sdl2:rect-y :to 150 :for dur/3 :starting (sdl2:get-ticks))
(animating :quading-in-out :the 'sdl2:rect-y :to 0 :for dur/3))))
#+end_src
Then to update each of the animations `anim` and `other-anim`, the above calls
#+begin_src lisp
(animise:run-tween anim (sdl2:get-ticks))
(animise:run-tween other-anim (sdl2:get-ticks))
#+end_src
before the start of the rendering step.
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