Challenge 2: ECS component
- Game Development course
- Expert
- Lesson 44/47
- 5 min
Write a component struct derived from IComponentData.
What is IComponentData?
In the ECS architecture components hold only data; game logic lives in systems. A component is defined with a struct that implements the IComponentData interface; a value type is used instead of a class because data is stored more efficiently this way. Inside a component only fields are found, never methods.
public struct HareketBileseni : IComponentData
{
public float hiz;
}The component above carries only the hiz data.
Practice Movement component
Define a data component named HareketBileseni with a hiz field; the component should be a structure that implements the IComponentData interface. In the Start method of the class BilesenTest, create a variable of that type, assign the value 5f to its hiz field and print the text "Hiz: " joined with the hiz field using Debug.Log.
Starter code
using Unity.Entities;
using UnityEngine;
public class BilesenTest : MonoBehaviour
{
void Start()
{
// HareketBileseni tipinde bir degisken olustur
// hiz alanina 5f degerini ata
// "Hiz: " metnini hiz alaniyla birlestirip yazdir
}
}
// HareketBileseni adli veri bilesenini tanimla: IComponentData'yi uygulayan bir yapi olsun
// icinde hiz adli ondalik alan bulunsunSample solution
using Unity.Entities;
using UnityEngine;
public struct HareketBileseni : IComponentData
{
public float hiz;
}
public class BilesenTest : MonoBehaviour
{
void Start()
{
HareketBileseni h = new HareketBileseni();
h.hiz = 5f;
Debug.Log("Hiz: " + h.hiz);
}
}Expected output
Hiz: 5
Practice Health component
Define a data component named YasamBileseni with a can field; the component should be a structure that implements the IComponentData interface. In the Start method of the class YasamTest, create a variable of that type, assign the value 50 to its can field and print the text "Can: " joined with the can field using Debug.Log.
Starter code
using Unity.Entities;
using UnityEngine;
public class YasamTest : MonoBehaviour
{
void Start()
{
// YasamBileseni tipinde bir degisken olustur
// can alanina 50 degerini ata
// "Can: " metnini can alaniyla birlestirip yazdir
}
}
// YasamBileseni adli veri bilesenini tanimla: IComponentData'yi uygulayan bir yapi olsun
// icinde can adli tam sayi alan bulunsunSample solution
using Unity.Entities;
using UnityEngine;
public struct YasamBileseni : IComponentData
{
public int can;
}
public class YasamTest : MonoBehaviour
{
void Start()
{
YasamBileseni y = new YasamBileseni();
y.can = 50;
Debug.Log("Can: " + y.can);
}
}Expected output
Can: 50
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 With which keyword is an IComponentData derived data component defined?
- With enum
- With struct Correct answer
- With class
- With interface
Explanation: ECS components are defined with the value type struct; struct is used instead of class.
2 Define the component
public ____ HareketBileseni : IComponentDatapublic struct HareketBileseni : IComponentDataExplanation: Because ECS components are value types they are defined with the struct keyword.
3 ECS component terms
| Term | Meaning |
|---|---|
IComponentData |
The interface that defines a component |
Bileşen |
A structure that holds only data |
Entity |
The identity that components attach to |
Alan |
The data record inside a component |