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https://github.com/Ukendio/jecs.git
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63 lines
1.6 KiB
Text
Executable file
63 lines
1.6 KiB
Text
Executable file
local jecs = require("@jecs")
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local world = jecs.world()
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local Position = world:component()
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local Velocity = world:component()
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local Name = world:component()
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local Vector3
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do
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Vector3 = {}
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Vector3.__index = Vector3
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function Vector3.new(x, y, z)
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x = x or 0
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y = y or 0
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z = z or 0
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return setmetatable({ X = x, Y = y, Z = z }, Vector3)
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end
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function Vector3.__add(left, right)
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return Vector3.new(left.X + right.X, left.Y + right.Y, left.Z + right.Z)
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end
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function Vector3.__mul(left, right)
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if typeof(right) == "number" then
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return Vector3.new(left.X * right, left.Y * right, left.Z * right)
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end
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return Vector3.new(left.X * right.X, left.Y * right.Y, left.Z * right.Z)
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end
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Vector3.one = Vector3.new(1, 1, 1)
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Vector3.zero = Vector3.new()
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end
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-- Create a few test entities for a Position, Velocity query
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local e1 = world:entity()
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world:set(e1, Name, "e1")
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world:set(e1, Position, Vector3.new(10, 20, 30))
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world:set(e1, Velocity, Vector3.new(1, 2, 3))
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local e2 = world:entity()
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world:set(e2, Name, "e2")
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world:set(e2, Position, Vector3.new(10, 20, 30))
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world:set(e2, Velocity, Vector3.new(4, 5, 6))
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-- This entity will not match as it does not have Position, Velocity
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local e3 = world:entity()
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world:set(e3, Name, "e3")
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world:set(e3, Position, Vector3.new(10, 20, 30))
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-- Create an uncached query for Position, Velocity.
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for entity, p, v in world:query(Position, Velocity) do
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-- Iterate entities matching the query
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p.X += v.X
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p.Y += v.Y
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p.Z += v.Z
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print(`{world:get(entity, Name)}: \{{p.X}, {p.Y}, {p.Z}}`)
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end
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-- Output:
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-- e2: {14, 25, 36}
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-- e1: {11, 22, 33}
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