From d17a410a656b7932c05209921d89d094983435e6 Mon Sep 17 00:00:00 2001
From: Askou <tom.augier@epitech.eu>
Date: Wed, 9 Jun 2021 17:23:55 +0200
Subject: [PATCH] basic gravity

---
 CMakeLists.txt                                |  2 ++
 .../Component/Gravity/GravityComponent.cpp    | 17 ++++++++++
 .../Component/Gravity/GravityComponent.hpp    | 32 +++++++++++++++++++
 sources/Runner/Runner.cpp                     |  4 +++
 sources/System/Gravity/GravitySystem.cpp      | 21 ++++++++++++
 sources/System/Gravity/GravitySystem.hpp      | 30 +++++++++++++++++
 6 files changed, 106 insertions(+)
 create mode 100644 sources/Component/Gravity/GravityComponent.cpp
 create mode 100644 sources/Component/Gravity/GravityComponent.hpp
 create mode 100644 sources/System/Gravity/GravitySystem.cpp
 create mode 100644 sources/System/Gravity/GravitySystem.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d7dc8112..8ae95107 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -92,6 +92,8 @@ set(SOURCES
 	sources/System/Sound/PlayerSoundManagerSystem.hpp
 	sources/System/Music/MusicSystem.hpp
 	sources/System/Music/MusicSystem.cpp
+	sources/Component/Gravity/GravityComponent.cpp
+	sources/System/Gravity/GravitySystem.cpp
 )
 
 add_executable(bomberman
diff --git a/sources/Component/Gravity/GravityComponent.cpp b/sources/Component/Gravity/GravityComponent.cpp
new file mode 100644
index 00000000..a6ee1db4
--- /dev/null
+++ b/sources/Component/Gravity/GravityComponent.cpp
@@ -0,0 +1,17 @@
+//
+// Created by Tom Augier on 2021-05-20.
+//
+
+#include "GravityComponent.hpp"
+
+namespace BBM
+{
+	GravityComponent::GravityComponent(WAL::Entity &entity)
+		: WAL::Component(entity)
+	{}
+
+	WAL::Component *GravityComponent::clone(WAL::Entity &entity) const
+	{
+		return new GravityComponent(entity);
+	}
+}
\ No newline at end of file
diff --git a/sources/Component/Gravity/GravityComponent.hpp b/sources/Component/Gravity/GravityComponent.hpp
new file mode 100644
index 00000000..f2b6a368
--- /dev/null
+++ b/sources/Component/Gravity/GravityComponent.hpp
@@ -0,0 +1,32 @@
+//
+// Created by Tom Augier on 2021-05-20.
+//
+
+#pragma once
+
+#include <Models/Callback.hpp>
+#include "Component/Component.hpp"
+#include "Entity/Entity.hpp"
+
+namespace BBM
+{
+	class GravityComponent : public WAL::Component
+	{
+		public:
+
+			//! @inherit
+			WAL::Component *clone(WAL::Entity &entity) const override;
+
+			//! @brief Constructor
+			GravityComponent(WAL::Entity &entity);
+
+			//! @brief A Gravity component can't be instantiated, it should be derived.
+			GravityComponent(const GravityComponent &) = default;
+
+			//! @brief default destructor
+			~GravityComponent() override = default;
+
+			//! @brief A Gravity component can't be assigned
+			GravityComponent &operator=(const GravityComponent &) = delete;
+	};
+}
\ No newline at end of file
diff --git a/sources/Runner/Runner.cpp b/sources/Runner/Runner.cpp
index 2ee46062..de4c821f 100644
--- a/sources/Runner/Runner.cpp
+++ b/sources/Runner/Runner.cpp
@@ -39,6 +39,8 @@
 #include "Component/Sound/SoundComponent.hpp"
 #include "System/Sound/PlayerSoundManagerSystem.hpp"
 #include "System/Music/MusicSystem.hpp"
+#include "Component/Gravity/GravityComponent.hpp"
+#include "System/Gravity/GravitySystem.hpp"
 
 namespace RAY3D = RAY::Drawables::Drawables3D;
 namespace RAY2D = RAY::Drawables::Drawables2D;
@@ -66,6 +68,7 @@ namespace BBM
 			.addSystem<HealthSystem>()
 			.addSystem<CollisionSystem>()
 			.addSystem<MovableSystem>()
+			.addSystem<GravitySystem>()
 			.addSystem<PlayerSoundManagerSystem>()
 			.addSystem<MusicSystem>();
 	}
@@ -101,6 +104,7 @@ namespace BBM
 			.addComponent<CollisionComponent>(BBM::Vector3f{0.25, 0, 0.25}, BBM::Vector3f{.75, 2, .75})
 			.addComponent<MovableComponent>()
 			.addComponent<SoundComponent>(soundPath)
+			.addComponent<GravityComponent>()
 			.addComponent<BombHolderComponent>()
 			.addComponent<HealthComponent>(1, [](WAL::Entity &entity) {
 				auto &animation = entity.getComponent<AnimationsComponent>();
diff --git a/sources/System/Gravity/GravitySystem.cpp b/sources/System/Gravity/GravitySystem.cpp
new file mode 100644
index 00000000..8e0801e1
--- /dev/null
+++ b/sources/System/Gravity/GravitySystem.cpp
@@ -0,0 +1,21 @@
+//
+// Created by Tom Augier on 2021-06-09.
+//
+
+#include "GravitySystem.hpp"
+
+namespace BBM
+{
+	GravitySystem::GravitySystem(WAL::Wal &wal)
+		: System(wal)
+	{}
+
+	void GravitySystem::onFixedUpdate(WAL::ViewEntity<GravityComponent, MovableComponent, PositionComponent> &entity)
+	{
+		auto &movable = entity.get<MovableComponent>();
+		auto &position = entity.get<PositionComponent>();
+
+		if (position.getY() > 0)
+			movable.addForce(Vector3f(0, -0.5, 0));
+	}
+}
\ No newline at end of file
diff --git a/sources/System/Gravity/GravitySystem.hpp b/sources/System/Gravity/GravitySystem.hpp
new file mode 100644
index 00000000..59963ac7
--- /dev/null
+++ b/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;
+	};
+}
\ No newline at end of file