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54 lines
2 KiB
CoffeeScript
54 lines
2 KiB
CoffeeScript
# The System will operate on its Thangs of interest in each WorldFrame.
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# Systems so far: AI, UI, Collision, Movement, Targeting, Programming, Combat, Vision, Hearing, Inventory, Actions
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# Other Systems might be things like Attraction, EdgeBounce, EdgeWrap, and non-physics ones, too, like Rendering, Animation, ...
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module.exports = class System
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@className: "System"
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constructor: (@world, config) ->
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# Unlike with Component, we don't automatically copy all our properties onto the World.
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# Subclasses can copy select properties here if they like.
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for key, value of (config ? {})
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@[key] = value
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@registries = []
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@hashes = {}
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# Start is called once the beginning, after all Thangs have been loaded.
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start: (thangs) ->
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# Update is called once per frame on all thangs that currently have exist=true in the World.
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# We return a simple numeric hash that will combine to a frame hash help us determine whether this frame has changed later on.
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update: (thangs) ->
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hash = 0
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# Finish is called once at the end, after all frames have been generated.
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finish: (thangs) ->
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addRegistry: (condition) ->
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registry = []
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@registries.push [registry, condition]
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registry
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# Register is called whenever a Thang changes important state (exists, dead, etc), and can be called more specifically by individual Thangs.
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register: (thang) ->
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for [registry, condition] in @registries
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if condition thang
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if thang not in registry
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registry.push thang
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else
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thangIndex = registry.indexOf thang
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if thangIndex isnt -1
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registry.splice thangIndex, 1
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null
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# Override this to determine which registries have which conditions
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checkRegistration: (thang, registry) ->
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hashString: (s) ->
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return @hashes[s] if s of @hashes
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hash = 0
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hash = hash * 31 + s.charCodeAt(i) for i in [0 ... Math.min(s.length, 100)]
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hash = @hashes[s] = hash % 3.141592653589793
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hash
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toString: ->
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"<System: #{@constructor.className}"
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