[Animations] Sinus ease function added

cmake @ f93d27f5

-Subproject commit 15115c56e314569265d0ca4bba3fad1993c2777f
+Subproject commit f93d27f5a7420ec6b3c1974eeb6e30bc9b97801d

include/ACGL/Animations/EaseFunctions.hh

@@ -90,6 +90,21 @@ public:
     }
 };
 
+class Sin : public EaseFunction
+{
+public:
+    Sin(float _frequency = 1.0f) :
+        mFrequency(_frequency) { }
+    virtual ~Sin(){}
+
+    virtual float value(const float _progress)
+    {
+        return sin(0.5f*M_PI*mFrequency*_progress);
+    }
+
+    float mFrequency;
+};
+
 class BlendLinear : public EaseFunction
 {
 public:

include/ACGL/Animations/Interpolator.hh

@@ -78,7 +78,7 @@ public:
 
     inline const T interpolate(const float _progress)
     {
-         return mStartValue + _progress*mDiffValue;
+         return mStartValue + mDiffValue*_progress;
     }
 
     inline const T& finish()