EcsRx plugin for a simple scaffolding for buff/effect system
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grofit Updated to EcsRx 0.9.0
Have updated to the latest EcsRx release.
Latest commit 3dbbeec Feb 20, 2017

EcsRx.Buffs - Plugin

This is a simple plugin for the EcsRx framework that provides infrastructure/scaffolding for basic buff/effect systems.

(Throughout all the docs I will often use the term buff and effect interchangeably, and although almost all classes are using the term effect it is the same notion as a buff just slightly more generic, I didn't want to call this EcsRx.Effects as people may get it confused with visual effects.)

What it does?

So it provides the most simple generic infrastructure to handle the notion of buffs. In almost all games that would require buffs you would need mechanisms for:

  • Tracking active buffs
  • Automatically expiring buffs
  • Finding out when a buff ticks (for things like poison, regen)
  • Finding out how potent a buff is (to work out the effect of it)
  • Managing the type of effect a buff would apply (to work out how to apply the buff)

There is not much to the plugin really, a simple model to represent the basic buff structure as well as some events and systems to notify you when changes occur so you can react to them.

Realistically you would probably build upon this or augment it for your needs, so you may have buffs which proc under certain conditions rather than arbitrary ticks, or you may want to have a buff which has multiple effects. However for a basis to build upon or for simple games which do not have any complex stat/buff requirements it should just do the main work for you out of the box.

It is not a complete system, but should be seen as a basis for creating other plugins that build upon it (unless your scenario is quite simple). It provides the important bits such as a contract for designers to create effects within your game, systems to keep track of what buffs are active and notify you when something happens via events so you can apply whatever logic to your entities.

(Just to be clear this PURELY deals with the aspect of buffs in a game, it is not a complete magic, stat or weapon system in any way it just provides a mechanism for you to apply buffs to an entity and be notified when something related to those buffs happens. You would still need to make your own item/spell system to actually apply the buffs to entities.)

How it works?

You register the plugin in your EcsRx application and it will automatically look for any entities with EffectableComponent and will automatically raise events when buffs are added/expired and tick. This way you can just add this component to your existing entities and then interact with the components ActiveEffects property and the systems the plugin registers will provide the events for free.

There are also some helper methods which allow you to find out the total potency of active buffs for a type, so for example if you had multiple types of poison being applied, you may want to total the total potency of active health reducing buffs.

How to use it

All you need to do from a basic perspective is just register the plugin in your application, apply the EffectableComponent to your entities, then subscribe to any of the events that are raised that you care about, most commonly EffectTickedEvent to then carry out your logic based upon the type of buff, its potency, any other related buffs that are applied that may alter the effect etc.

For more documentation look in the docs folder which documents the important bits in further detail, there is also an example use case for the system within the project with its own documentation which may help.