+ gravity_enabled_flag = enable_gravity;
+}
+
+bool
+Physic::gravity_enabled() const
+{
+ return gravity_enabled_flag;
+}
+
+void
+Physic::set_gravity(float gravity)
+{
+ this->gravity = gravity * 100;
+}
+
+float
+Physic::get_gravity() const
+{
+ return gravity / 100;