60 lines
1.3 KiB
Lua
60 lines
1.3 KiB
Lua
require "lib.option"
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__Vec3 = {
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_x = 0,
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_y = 0,
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_z = 0,
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}
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function Vec3(vec)
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return setmetatable({
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_x = vec[1] or 0,
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_y = vec[2] or 0,
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_z = vec[3] or 0,
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}, {
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__index = __Vec3,
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__tostring = __Vec3.__tostring,
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__add = __Vec3.add,
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__mul = __Vec3.scale,
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__unm = function(self)
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return __Vec3.scale(self, -1)
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end,
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__eq = function(self, other)
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return
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self._x == other._x
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and self._y == other._y
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and self._z == other._z
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end,
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})
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end
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function __Vec3:add(other)
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Vec3 { self._x + other._x, self._y + other._y, self._z + other._z }
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end
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function __Vec3:scale(factor)
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return Vec3 { self._x * factor, self._y * factor, self._z * factor }
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end
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function __Vec3:length()
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return math.sqrt(self._x ^ 2 + self._y ^ 2 + self._z ^ 2)
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end
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function __Vec3:normalize()
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local length = self:length()
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if not length then return None end
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return Some(Vec3 {
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self._x / length,
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self._y / length,
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self._z / length
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})
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end
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function __Vec3:dot(other)
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return self._x * other._x + self._y * other._y + self._z * other._z
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end
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function __Vec3:__tostring()
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return "Vec3{" .. self._x .. ", " .. self._y .. ", " .. self._z .. "}"
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end
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