Unity DOTS技术(六)World详解

下面讲解World的一些基本操作

一.实体操作

1.创建实体

Entity tempERntity = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntity();

2.创建实体并挂载组件

Entity tempERntity =World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntity(typeof(PrintComponentData1),typeof(RotationEulerXYZAuthoring3 ));

####3.复制实体

World.DefaultGameObjectInjectionWorld.EntityManager.Instantiate(tempErntity);

4.使用NativeArray存储实体

NativeArray类似于List,在Dots中的实体应当使用NativeArray进行储存及操作.
NativeArray<Entity> tempNativeArray = new NativeArray<Entity>(5, Allocator.Temp);
World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntity(tempEntityArchetype, tempNativeArray);

5.查找出所有的组件

NativeArray<Entity> tempEntitis = World.DefaultGameObjectInjectionWorld.EntityManager.GetAllEntities();
foreach (var item in tempEntitis)
{
    Debug.Log(item.Index);
}

6.类型条件查询

需要注意的是查询结束后需要释放查询

EntityQuery tempEntityQuery = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntityQuery(typeof(PrintComponentData1), typeof(RotationEulerXYZAuthoring3));//这里的查询条件是And的关系
NativeArray<Entity> tempEntities2 = tempEntityQuery.ToEntityArray(Allocator.TempJob);
foreach (var item in tempEntities2)
{
    Debug.Log(item.Index);
}
tempEntities2.Dispose();

7.删除单个实体

//创建

Entity tempErntity = World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntity(typeof(PrintComponentData1), typeof(RotationEulerXYZAuthoring3));
World.DefaultGameObjectInjectionWorld.EntityManager.Instantiate(tempErntity);
//删除
World.DefaultGameObjectInjectionWorld.EntityManager.DestroyEntity(tempErntity);

8.删除组里的实体

//创建组 
EntityArchetype tempEntityArchetype = World.DefaultGameObjectInjectionWorld.EntityManager.CreateArchetype(typeof(PrintComponentData1), typeof(RotationEulerXYZAuthoring3));
NativeArray<Entity> tempNativeArray = new NativeArray<Entity>(5, Allocator.Temp);
World.DefaultGameObjectInjectionWorld.EntityManager.CreateEntity(tempEntityArchetype, tempNativeArray);
//删除组
World.DefaultGameObjectInjectionWorld.EntityManager.DestroyEntity(teimpNativeArray);

9.按查找结果删除组

World.DefaultGameObjectInjectionWorld.EntityManager.DestroyEntity(tempEntityQuery);

二.组件操作

1.添加组件

方法一

World.DefaultGameObjectInjectionWorld.EntityManager.AddComponent(tempErntity1, typeof(PrintComponentData1));

方法二

World.DefaultGameObjectInjectionWorld.EntityManager.AddComponent<PrintComponentData1>(tempErntity1);

2.组数组批量添加组件

方法一

World.DefaultGameObjectInjectionWorld.EntityManager.AddComponent<PrintComponentData1>(tempNativeArray);

方法二

World.DefaultGameObjectInjectionWorld.EntityManager.AddComponent(tempNativeArray, typeof(PrintComponentData1));

方法三同时添加多个组件

World.DefaultGameObjectInjectionWorld.EntityManager.AddComponents(tempErntity1, new ComponentTypes(typeof(PrintComponentData1), typeof(RotationEulerXYZAuthoring3)));

3.创建初始化并赋值

World.DefaultGameObjectInjectionWorld.EntityManager.AddComponentData(tempErntity1, new PrintComponentData1()
{
    printData = 5
});

4.使用特性挂载组件

[GenerateAuthoringComponent]

5.获取实体中的组件

PrintComponentData1 temPrintComponentData = World.DefaultGameObjectInjectionWorld.EntityManager.GetComponentData<PrintComponentData1>(tempErntity1);

6.修改实体上的组件值

World.DefaultGameObjectInjectionWorld.EntityManager.SetComponentData(tempErntity1, new PrintComponentData1() { printData = 888 }); 

7.删除指实体上的组件

World.DefaultGameObjectInjectionWorld.EntityManager.RemoveComponent<PrintComponentData1>(tempErntity1);

8.删除组内所有实体的指定组件

World.DefaultGameObjectInjectionWorld.EntityManager.RemoveComponent<PrintComponentData1>(tempNativeArray);

9.删除查询结果中的组件

World.DefaultGameObjectInjectionWorld.EntityManager.RemoveComponent<PrintComponentData1>(tempEntityQuery);