mirror of
https://github.com/Ukendio/jecs.git
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61 lines
1.4 KiB
Text
61 lines
1.4 KiB
Text
local jecs = require("@jecs")
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local world = jecs.World.new()
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local Name = world:component()
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local function named(ctr, name)
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local e = ctr(world)
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world:set(e, Name, name)
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return e
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end
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local function name(e)
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return world:get(e, Name)
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end
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local Position = named(world.component, "Position") :: jecs.Entity<Vector3>
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local Previous = jecs.Rest
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local PreviousPosition = jecs.pair(Previous, Position)
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local added = world
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:query(Position)
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:without(PreviousPosition)
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:cached()
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local changed = world
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:query(Position, PreviousPosition)
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:cached()
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local removed = world
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:query(PreviousPosition)
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:without(Position)
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:cached()
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local e1 = named(world.entity, "e1")
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world:set(e1, Position, Vector3.new(10, 20, 30))
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local e2 = named(world.entity, "e2")
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world:set(e2, Position, Vector3.new(10, 20, 30))
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for e, p in added:iter() do
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print(`Added {e}: \{{p.X}, {p.Y}, {p.Z}}`)
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world:set(e, PreviousPosition, p)
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end
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world:set(e1, Position, "")
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for e, new, old in changed:iter() do
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if new ~= old then
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print(`{name(new)}'s Position changed from \{{old.X}, {old.Y}, {old.Z}\} to \{{new.X}, {new.Y}, {new.Z}\}`)
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world:set(e, PreviousPosition, new)
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end
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end
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world:remove(e2, Position)
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for e in removed:iter() do
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print(`Position was removed from {name(e)}`)
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end
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-- Output:
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-- Added 265: {10, 20, 30}
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-- Added 264: {10, 20, 30}
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-- e1's Position changed from {10, 20, 30} to {999, 999, 1998}
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-- Position was removed from e2
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