(NDK) Added Velocity component/system

Former-commit-id: 427b7175fbf9723fcd1d54fc279b8b70167745d4

SDK/src/NDK/Components/VelocityComponent.cpp

@@ -0,0 +1,10 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
+
+#include <NDK/Components/VelocityComponent.hpp>
+
+namespace Ndk
+{
+	ComponentIndex VelocityComponent::componentIndex;
+}

SDK/src/NDK/Sdk.cpp

@@ -15,7 +15,9 @@
 #include <NDK/BaseSystem.hpp>
 #include <NDK/Components/ListenerComponent.hpp>
 #include <NDK/Components/NodeComponent.hpp>
+#include <NDK/Components/VelocityComponent.hpp>
 #include <NDK/Systems/ListenerSystem.hpp>
+#include <NDK/Systems/VelocitySystem.hpp>
 
 namespace Ndk
 {
@@ -49,9 +51,11 @@ namespace Ndk
 			// Composants
 			InitializeComponent<ListenerComponent>("NdkList");
 			InitializeComponent<NodeComponent>("NdkNode");
+			InitializeComponent<VelocityComponent>("NdkVeloc");
 
 			// Systèmes
 			InitializeSystem<ListenerSystem>();
+			InitializeSystem<VelocitySystem>();
 
 			NazaraNotice("Initialized: SDK");
 			return true;

SDK/src/NDK/Systems/VelocitySystem.cpp

@@ -0,0 +1,28 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
+
+#include <NDK/Systems/VelocitySystem.hpp>
+#include <NDK/Components/NodeComponent.hpp>
+#include <NDK/Components/VelocityComponent.hpp>
+
+namespace Ndk
+{
+	VelocitySystem::VelocitySystem()
+	{
+		Requires<NodeComponent, VelocityComponent>();
+	}
+
+	void VelocitySystem::Update(float elapsedTime)
+	{
+		for (const Ndk::EntityHandle& entity : GetEntities())
+		{
+			NodeComponent& node = entity->GetComponent<NodeComponent>();
+			const VelocityComponent& velocity = entity->GetComponent<VelocityComponent>();
+
+			node.Move(velocity.linearVelocity * elapsedTime);
+		}
+	}
+
+	SystemIndex VelocitySystem::systemIndex;
+}

SDK/src/NDK/World.cpp

@@ -5,6 +5,7 @@
 #include <NDK/World.hpp>
 #include <Nazara/Core/Error.hpp>
 #include <NDK/Systems/ListenerSystem.hpp>
+#include <NDK/Systems/VelocitySystem.hpp>
 
 namespace Ndk
 {
@@ -17,6 +18,7 @@ namespace Ndk
 	void World::AddDefaultSystems()
 	{
 		AddSystem<ListenerSystem>();
+		AddSystem<VelocitySystem>();
 	}
 
 	const EntityHandle& World::CreateEntity()