basic gravity

sources/System/Gravity/GravitySystem.hpp

@@ -0,0 +1,30 @@
+//
+// Created by Tom Augier on 2021-06-09.
+//
+
+#pragma once
+
+#include "Component/Movable/MovableComponent.hpp"
+#include "Component/Position/PositionComponent.hpp"
+#include "Component/Gravity/GravityComponent.hpp"
+#include "System/System.hpp"
+
+namespace BBM
+{
+	//! @brief A system to handle Gravity entities.
+	class GravitySystem : public WAL::System<GravityComponent, MovableComponent, PositionComponent>
+	{
+	public:
+		//! @inherit
+		void onFixedUpdate(WAL::ViewEntity<GravityComponent, MovableComponent, PositionComponent> &entity) override;
+
+		//! @brief A default constructor
+		explicit GravitySystem(WAL::Wal &wal);
+		//! @brief A Gravity system is copy constructable
+		GravitySystem(const GravitySystem &) = default;
+		//! @brief A default destructor
+		~GravitySystem() override = default;
+		//! @brief A system is not assignable.
+		GravitySystem &operator=(const GravitySystem &) = delete;
+	};
+}