Add InQuadEasing and OutQuadEasing and make tasklists...

easing more natural

projects/mtg/include/Easing.h

@@ -167,6 +167,50 @@ public:
     }
 };
 
+/*! \brief This class defines an easing with quadratic acceleration
+ */
+class InQuadEasing : public Easing
+{
+public:
+    /*! \brief Calls Easing::Easing(val).
+     *
+     * \see Easing::Easing(float& val)
+     */
+    InQuadEasing(float& val): Easing(val) {}
+
+    /*! \brief Implements the value calculation.
+     *
+     * \see Easing::updateValue()
+     */
+    void updateValue()
+    {
+        float time_tmp = time_acc / duration;
+        value = delta_value * time_tmp * time_tmp + start_value;
+    }
+};
+
+/*! \brief This class defines an easing with quadratic decceleration
+ */
+class OutQuadEasing : public Easing
+{
+public:
+    /*! \brief Calls Easing::Easing(val).
+     *
+     * \see Easing::Easing(float& val)
+     */
+    OutQuadEasing(float& val): Easing(val) {}
+
+    /*! \brief Implements the value calculation.
+     *
+     * \see Easing::updateValue()
+     */
+    void updateValue()
+    {
+        float time_tmp = time_acc / duration;
+        value = (-delta_value) * time_tmp * (time_tmp - 2.0f) + start_value;
+    }
+};
+
 /*! \brief This class defines an easing with quadratic acceleration and decceleration.
  */
 class InOutQuadEasing : public Easing