Working on how to do an idle 'breathing' animation for sprites.

animation.cpp

@@ -17,7 +17,7 @@ namespace components {
       case ease::NONE:
         return 0.0;
       case ease::SINE:
-        return tick;
+        return std::abs(std::sin(subframe * ease_rate));
       case ease::OUT_CIRC:
         return ease::out_circ(tick);
       case ease::OUT_BOUNCE:
@@ -41,6 +41,7 @@ namespace components {
 
     if(playing && current < frames) {
       float tick = twitching();
+      fmt::print("tick: {}\r", tick);
 
       if(stationary) {
         switch(motion) {
@@ -178,9 +179,9 @@ namespace animation {
     return MGR.animations.contains(name);
   }
 
-  Animation load(const std::string& name) {
+  Animation load(const std::string& name, const std::string& state) {
     dbc::check(initialized, "You forgot to initialize animation.");
-    return MGR.animations.at(name);
+    return MGR.animations.at(name + state);
   }
 
   void configure(DinkyECS::World& world, DinkyECS::Entity entity) {

animation.hpp

@@ -16,7 +16,7 @@ namespace animation {
   void center(sf::Sprite& target, sf::Vector2f pos);
 
   void init();
-  components::Animation load(const std::string& name);
+  components::Animation load(const std::string& name, const std::string& state="");
   bool has(const std::string& name);
   void configure(DinkyECS::World& world, DinkyECS::Entity entity);
   void step_animation(DinkyECS::World& world, DinkyECS::Entity entity, sf::Vector2f& scale_out, sf::Vector2f& pos_out, sf::IntRect& rect_out);

assets/animations.json

@@ -235,15 +235,33 @@
     "flipped": false,
     "looped": false
   },
+  "rat_king_boss": {
+    "_type": "Animation",
+    "easing": 4,
+    "motion": 0,
+    "ease_rate": 0.5,
+    "min_x": 0.6,
+    "min_y": 0.6,
+    "max_x": 0.8,
+    "max_y": 0.8,
+    "simple": false,
+    "frames": 2,
+    "speed": 0.02,
+    "scaled": true,
+    "stationary": true,
+    "toggled": false,
+    "flipped": false,
+    "looped": false
+  },
   "torch_fixture": {
     "_type": "Animation",
     "easing": 0,
     "motion": 0,
-    "ease_rate": 0.5,
-    "min_x": 0.5,
-    "min_y": 0.5,
-    "max_x": 0.5,
-    "max_y": 0.5,
+    "ease_rate": 0.1,
+    "min_x": 0.6,
+    "min_y": 0.6,
+    "max_x": 0.6,
+    "max_y": 0.6,
     "simple": false,
     "frames": 3,
     "speed": 0.2,