Added Sprite Coloring and Value Animations

asloengine/animation.cpp

@@ -0,0 +1,94 @@
+#include "headers/animation.hpp"
+
+namespace asloengine
+{
+
+    Animation::Animation(Function _function, float _start_value, float _end_value, float _duration)
+    {
+
+        reset(_function, _start_value, _end_value, _duration);
+
+    }
+
+    void Animation::reset(Function _function, float _start_value, float _end_value, float _duration)
+    {
+
+        function = _function;
+        start_value = _start_value;
+        current_value = _start_value;
+        end_value = _end_value;
+        time = 0;
+        duration = _duration;        
+
+    }
+
+    float Animation::animate(float delta_time)
+    {
+
+        time += delta_time;
+
+        if (time > duration)
+        {
+            time = duration;
+        }
+
+        switch (function)
+        {
+
+            case LINEAR:
+                return calculate_linear();
+            
+            case EASE_IN:
+                return calculate_ease_in();
+            
+            case EASE_OUT:
+                return calculate_ease_out();
+            
+            case EASE_IN_OUT:
+                return calculate_ease_in_out();
+
+        }
+
+        return 0;
+
+    }
+
+    float Animation::calculate_linear()
+    {
+
+        float value_difference = end_value - start_value;
+        float progress = time / duration;
+
+        return start_value + value_difference * progress;
+
+    }
+    
+    float Animation::calculate_ease_in()
+    {
+
+        // TO-DO
+        return 0;
+
+    }
+
+    float Animation::calculate_ease_out()
+    {
+
+        // TO-DO
+        return 0;
+
+    }
+
+    float Animation::calculate_ease_in_out()
+    {
+
+        float value_difference = end_value - start_value;
+        float progress = time / duration;
+        
+        progress = pow(progress, 2) / (pow(progress, 2) + pow((1 - progress), 2));
+        
+        return (start_value + value_difference * progress);
+        
+    }
+
+}