main.lua

local lovetoys = require('lovetoys')

lovetoys.initialize({globals = true, debug = true})

function love.load()
    local Position = Component.create("position", {"x", "y"}, {x = 0, y = 0})
    local Velocity = Component.create("velocity", {"vx", "vy"})

    local player = Entity()
    player:initialize()

    player:add(Position(150, 25))
    player:add(Velocity(100, 100))
    
    local MixedSystem = class("MixedSystem", System)

    function MixedSystem:requires()
        return {"position", "velocity"}
    end

    function MixedSystem:update(dt)
        for _, entity in pairs(self.targets) do
            local position = entity:get("position")
            local velocity = entity:get("velocity")
            position.x = position.x + velocity.vx * dt
            position.y = position.y + velocity.vy * dt
        end
    end

    function MixedSystem:draw()
        for _, entity in pairs(self.targets) do
            love.graphics.rectangle("fill", entity:get("position").x, entity:get("position").y, 10, 10)
        end
    end

    engine = Engine()
    engine:addEntity(player)

    engine:addSystem(MixedSystem(), "draw")
    engine:addSystem(MixedSystem(), "update")
end

function love.update(dt)
    engine:update(dt)
end

function love.draw()
    engine:draw()
end