Force entities list to be a vector, and rename function

common/src/play_clj/core.clj

@@ -36,6 +36,7 @@
                     :total-time 0
                     :delta-time 0)
              on-show
+             vec
              (reset! entities)))
       (render [delta-time]
         (let [total-time (+ (:total-time @screen) delta-time)
@@ -43,6 +44,8 @@
                                 :total-time total-time
                                 :delta-time delta-time)]
           (->> (on-render screen-map @entities)
+               (remove nil?)
+               vec
                (reset! entities)
                (draw! screen-map))))
       (hide [] (on-hide @screen))

common/src/play_clj/core_2d.clj

@@ -45,8 +45,8 @@
                (utils/static-field :graphics :g2d :Animation
                                    ~(or (first args) :normal))))
 
-(defn get-animation-frame
+(defn get-key-frame
   ([screen ^Animation animation]
-    (get-animation-frame screen animation true))
+    (get-key-frame screen animation true))
   ([screen ^Animation animation is-looping?]
     (.getKeyFrame animation (:total-time screen) is-looping?)))