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https://github.com/appgurueu/modlib.git
synced 2024-08-20 05:14:10 +02:00
63 lines
1.3 KiB
Lua
63 lines
1.3 KiB
Lua
local mt_vector = vector
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local vector = getfenv(1)
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function new(v)
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return setmetatable(v, vector)
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end
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function from_xyzw(v)
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return new{v.x, v.y, v.z, v.w}
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end
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function to_xyzw(v)
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return {x = v[1], y = v[2], z = v[3], w = v[4]}
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end
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function to_minetest(v)
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return mt_vector.new(unpack(v))
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end
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function combine(v1, v2, f)
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local new_vector = {}
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for key, value in pairs(v1) do
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new_vector[key] = f(value, v2[key])
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end
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return new(new_vector)
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end
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function apply(v, s, f)
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local new_vector = {}
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for key, value in pairs(v) do
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new_vector[key] = f(value, s)
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end
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return new(new_vector)
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end
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function combinator(f)
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return function(v1, v2)
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return combine(v1, v2, f)
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end, function(v, s)
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return apply(v, s, f)
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end
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end
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add, add_scalar = combinator(function(a, b) return a + b end)
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subtract, subtract_scalar = combinator(function(a, b) return a - b end)
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multiply, multiply_scalar = combinator(function(a, b) return a * b end)
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divide, divide_scalar = combinator(function(a, b) return a / b end)
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function norm(v)
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local sum = 0
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for _, c in pairs(v) do
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sum = sum + c*c
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end
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return sum
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end
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function length(v)
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return math.sqrt(norm(v))
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end
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function normalize(v)
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return divide_scalar(v, length(v))
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end |