Animations now have an easing/ease_rate setting that will do a dynamic scaling effect on them during the animation sequence.

easings.hpp

@@ -3,6 +3,10 @@
 
 namespace ease {
 
+  enum Style {
+    SINE, OUT_CIRC, OUT_BOUNCE, IN_OUT_BACK, NONE
+  };
+
   inline double sine(double x) {
     return (std::sin(x) + 1.0) / 2.0;
   }