Animations are now being pulled correctly but I need to add a timing concept to animations instead of ticks.

animation.cpp

@@ -31,6 +31,9 @@ namespace components {
   }
 
   void Animation::step(sf::Vector2f& scale_out, sf::Vector2f& pos_out, sf::IntRect& rect_out) {
+    dbc::check(rect_out.size.x > 0, "invalid frame width in animation");
+    dbc::check(rect_out.size.y > 0, "invalid frame height in animation");
+
     if(playing && current < frames) {
       float tick = twitching();
       scale_out.x = std::lerp(scale_out.x, scale_out.x + scale, tick);
@@ -70,10 +73,9 @@ namespace animation {
   static AnimationManager MGR;
   static bool initialized = false;
 
-  bool apply(Animation& anim, sf::Sprite& sprite) {
+  bool apply(Animation& anim, sf::Sprite& sprite, sf::Vector2f pos) {
     sf::IntRect rect{{0,0}, {anim.frame_width, anim.frame_height}};
     sf::Vector2f scale{anim.scale, anim.scale};
-    sf::Vector2f pos{0, 0};
 
     anim.step(scale, pos, rect);
 
@@ -156,5 +158,4 @@ namespace animation {
       animation.play();
     }
   }
-
 }