# Auto Injections for [DragonECS](https://github.com/DCFApixels/DragonECS)
The extension is designed to reduce the amount of code by simplifying dependency injection by doing injections automatically.
> [!WARNING]
> The project is a work in progress, API may change.
>
> While the English version of the README is incomplete, you can view the [Russian version](https://github.com/DCFApixels/DragonECS-AutoInjections/blob/main/README-RU.md).
# Installation
Versioning semantics - [Open](https://gist.github.com/DCFApixels/e53281d4628b19fe5278f3e77a7da9e8#file-dcfapixels_versioning_ru-md)
## Environment
Requirements:
+ Dependency: [DragonECS](https://github.com/DCFApixels/DragonECS)
+ Minimum version of C# 7.3;
Optional:
+ Game engines with C#: Unity, Godot, MonoGame, etc.
Tested with:
+ **Unity:** Minimum version 2020.1.0;
## Unity Installation
* ### Unity Package
The package can be installed as a Unity package by adding the Git URL [in the PackageManager](https://docs.unity3d.com/2023.2/Documentation/Manual/upm-ui-giturl.html) or manually adding it to `Packages/manifest.json`:
```
https://github.com/DCFApixels/DragonECS-AutoInjections.git
```
* ### Source Code
The package can also be added to the project as source code.
# Code Example
```csharp
class VelocitySystemDI : IEcsRun
{
class Aspect : EcsAspectAuto
{
[ExcImplicit(typeof(FreezedTag))]
[Inc] public EcsPool poses;
[Inc] public EcsPool velocities;
}
[EcsInject] EcsDefaultWorld _world;
[EcsInject] TimeService _time;
public void Run()
{
foreach (var e in _world.Where(out Aspect a))
{
a.poses.Get(e).position += a.velocities.Read(e).value * _time.DeltaTime;
}
}
}
```
Same code but without AutoInjections
```csharp
class VelocitySystem : IEcsRun, IEcsInject, IEcsInject
{
class Aspect : EcsAspect
{
public EcsPool poses;
public EcsPool velocities;
public Aspect(Builder b)
{
b.Exclude();
poses = b.Include();
velocities = b.Include();
}
}
EcsDefaultWorld _world;
TimeService _time;
public void Inject(EcsDefaultWorld obj) => _world = obj;
public void Inject(TimeService obj) => _time = obj;
public void Run()
{
foreach (var e in _world.Where(out Aspect a))
{
a.poses.Get(e).position += a.velocities.Read(e).value * _time.DeltaTime;
}
}
}
```