*Make your stats react!*

Have you ever tried to add a few "simple" stats and modifiers to your game, and then gradually had the whole system morph into an unmanageable mess?

Suddenly you're trying to keep track of a starting value of 5 with +2 from a weapon and a -20% timed debuff, oh, but you're also stacking a +50% potion buff, and now you're running into problems where the value never ends up being correct. And the timed modifiers can be added from anywhere, at any time, so it gets messy fast.

**Catalyst** is designed to make this stuff not suck.

Create a stat:

    hp_max = new CatalystStatistic(10);

Add whatever modifiers you want:

    var _mod1 = new CatalystModifier(-1, eCatMathOps.ADD);
    var _mod2 = new CatalystModifier(0.2, eCatMathOps.MULTIPLY);
    var _mod3 = new CatalystModifier(-0.5, eCatMathOps.MULTIPLY);
    
    hp_max.AddModifier(_mod1).AddModifier(_mod2).AddModifier(_mod3);

Read the value whenever you need it:

    var _hp_max = hp_max.GetValue();

And Catalyst handles everything else automatically.

But that's only the start...

# Key features

Some of the stuff Catalyst gives you access to:

* Clamp or round stat values easily.
* Automatic duration handling (give a modifier a duration and it'll remove itself when time's up).
* Tags on stats and modifiers so you can do mass removal / grouping (eg "cleanse all debuffs").
* Layers for ordering (eg Equipment mods apply before Temporary mods).
* Context-aware evaluation for weirder designs (eg "stacking buff based on how many burning enemies are nearby").
* Previewing (the classic "if I swap these two gear pieces, what changes?").
* Derived base values (max HP based on vitality/strength? set it once and it stays up to date).
* Modifier stacks (plus event-driven and context-aware stacking).
* Modifier families (rules like "only strongest applies" vs "both apply" vs "weakest applies for debuffs").
* Plus more.

The goal is basically: let you express your designs without spending your life babysitting stat math.

# "Isn't this only for RPGs?"

Nope. I've used Catalyst for all types of games.

Any time you're managing a number and might want to change it at points, Catalyst fits. Platformers (timed jump powerups), top-down shooters (move speed / fire rate changes), RTS unit stats, roguelikes / action adventure games, even stuff like tracking keys in a visual novel (source labels on modifiers make it easy to show where things came from).

# Links

* Itch: [**Catalyst** on itch](https://refreshertowel.itch.io/catalyst) (there is a launch discount)
* [Get the **Ignition Kit**](https://itch.io/s/176065/ignition-kit) to get Catalyst alongside [Statement](https://refreshertowel.itch.io/statement), [Pulse](https://refreshertowel.itch.io/pulse) and [Echo](https://refreshertowel.itch.io/echo) for a nice discount.
* [Or get the **Full Pass Suite**](https://itch.io/s/177994/full-suite-pass) for all my current and future tools for a single price!
* Docs + examples: [https://refreshertowel.github.io/docs/catalyst/](https://refreshertowel.github.io/docs/catalyst/)

Catalyst - A stat/modifier framework for GM (durations, tags, layers, derived stats and more)