18 lines
679 B
Lua
18 lines
679 B
Lua
local world = require("world")
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local sqrt = math.sqrt
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world:filteredSystem("velocity", { position = T.XyPair, velocity = T.XyPair }, function(e, dt, system)
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if sqrt((e.velocity.x * e.velocity.x) + (e.velocity.y * e.velocity.y)) < 2 then
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-- velocity = nil
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else
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e.position.x = e.position.x + (e.velocity.x * dt)
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e.position.y = e.position.y + (e.velocity.y * dt)
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end
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end)
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world:filteredSystem("drag", { velocity = T.XyPair, drag = T.number }, function(e, dt, system)
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local currentDrag = e.drag * dt
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e.velocity.x = e.velocity.x - (e.velocity.x * currentDrag * dt)
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e.velocity.y = e.velocity.y - (e.velocity.y * currentDrag * dt)
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end)
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