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94 lines
3.7 KiB
Markdown
94 lines
3.7 KiB
Markdown
# tiny-ecs #
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[](https://travis-ci.org/bakpakin/tiny-ecs)
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[](LICENSE)
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Tiny-ecs is an Entity Component System for lua that's simple, flexible, and useful.
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Because of lua's tabular nature, Entity Component Systems are a natural choice
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for simulating large and complex systems. For more explanation on Entity
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Component Systems, here is some
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[basic info](http://en.wikipedia.org/wiki/Entity_component_system "Wikipedia").
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Tiny-ecs also works well with objected oriented programming in lua because
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Systems and Entities do not use metatables. This means you can subclass your
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Systems and Entities, and use existing lua class frameworks with tiny-ecs, no problem.
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For an example on how to use tiny-ecs with object-oriented lua, take a look at the
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demo branch, specifically the systems and entities sub-directories.
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## Overview ##
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Tiny-ecs has four important types: Worlds, Filters, Systems, and Entities.
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Entities, however, can be any lua table, and Filters are just functions that
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take an Entity as a parameter.
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### Entities ###
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Entities are simply lua tables of data that gets processed by Systems. Entities
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should contain primarily data rather than code, as it is the Systems's job to
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do logic on data. Henceforth, a key-value pair in an Entity will
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be referred to as a Component.
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### Worlds ###
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Worlds are the outermost containers in tiny-ecs that contain both Systems
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and Entities. In typical use, only one World is used at a time.
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### Systems ###
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Systems in tiny-ecs describe how to update Entities. Systems select certain Entities
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using a Filter, and then only update those select Entities. Some Systems don't
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update Entities, and instead just act as function callbacks every update. Tiny-ecs
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provides functions for creating Systems easily, as well as creating Systems that
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can be used in an object oriented fashion.
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### Filters ###
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Filters are used to select Entities. Filters can be any lua function, but
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tiny-ecs provides some functions for generating common ones, like selecting
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only Entities that have all required components.
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## Example ##
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```lua
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local tiny = require("tiny")
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local talkingSystem = tiny.processingSystem()
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talkingSystem.filter = tiny.requireAll("name", "mass", "phrase")
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function talkingSystem:process(e, dt)
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e.mass = e.mass + dt * 3
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print(e.name .. ", who weighs " .. e.mass .. " pounds, says, \"" .. e.phrase .. "\"")
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end
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local joe = {
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name = "Joe",
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phrase = "I'm a plumber.",
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mass = 150,
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hairColor = "brown"
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}
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local world = tiny.world(talkingSystem, joe)
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for i = 1, 20 do
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world:update(1)
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end
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```
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## Use It ##
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Copy paste tiny.lua into your source folder. For stability and consistent API,
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please use a tagged release or use luarocks. Tagged releases will have a version
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number in `tiny._VERSION`, while other commits will just have the string 'scm'.
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## Luarocks ##
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Tiny-ecs is also on [Luarocks](https://luarocks.org/) and can be installed with
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`luarocks install tiny-ecs`.
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## Demo ##
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Check out the [demo](https://github.com/bakpakin/tiny-ecs/tree/demo-commandokibbles), a game
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originally written for Ludum Dare 32 with the theme 'An Unconventional Weapon'. The demo uses
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[LÖVE](https://love2d.org/), an amazing game framework for lua.
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## Testing ##
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Tiny-ecs uses [busted](http://olivinelabs.com/busted/) for testing. Install and run
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`busted` from the command line to test.
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## Documentation ##
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See API [here](http://bakpakin.github.io/tiny-ecs/doc/).
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For the most up-to-date documentation, read the source code, or generate the HTML
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locally with [LDoc](http://stevedonovan.github.io/ldoc/).
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See the original forum thread [here](https://love2d.org/forums/viewtopic.php?f=5&t=79937&p=182589).
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