+#include "math/vector.h"
+
+/// Physics engine.
+/** This is a very simplistic physics engine handling accelerated and constant
+ * movement along with gravity.
+ */
+class Physic
+{
+public:
+ Physic();
+ ~Physic();
+
+ /// Resets all velocities and accelerations to 0.
+ void reset();
+
+ /// Sets velocity to a fixed value.
+ void set_velocity(float vx, float vy);
+
+ void set_velocity_x(float vx);
+ void set_velocity_y(float vy);
+
+ /// Velocities invertion.
+ void inverse_velocity_x();
+ void inverse_velocity_y();
+
+ float get_velocity_x();
+ float get_velocity_y();
+
+ /// Set acceleration.
+ /** Sets acceleration applied to the object. (Note that gravity is
+ * eventually added to the vertical acceleration)
+ */
+ void set_acceleration(float ax, float ay);
+
+ void set_acceleration_x(float ax);
+ void set_acceleration_y(float ay);
+
+ float get_acceleration_x();
+ float get_acceleration_y();
+
+ /// Enables or disables handling of gravity.
+ void enable_gravity(bool gravity_enabled);
+
+ Vector get_movement(float elapsed_time);