/System/Classes/Vector2

Vector2.lua

local Vector2 = {}
local sqrt = math.sqrt

function Vector2.New(x, y)
    local vec2 = {}
    setmetatable(vec2, Vector2)
    vec2.x = x or 0
    vec2.y = y or 0
    return vec2
end

--Fires when you index a Vector2 property
function Vector2.__index(self, index)
    if index == "magnitude" then
        local x, y = rawget(self, "x"), rawget(self, "y")
        return sqrt(x * x + y * y)
    elseif index == "unit" then
        local x, y = rawget(self, "x"), rawget(self, "y")
        local len = sqrt(x * x + y * y)
        if len == 0 then
            return self
        end
        local normVec = Vector2.New()
        normVec.x = x / len
        normVec.y = y / len
        return normVec
    end
    return rawget(self, index)
end

--Returns Vector2 translated (slid) by Vector2
function Vector2.__add(lhs, rhs)
    return Vector2.New(lhs.x + rhs.x, lhs.y + rhs.y)
end

--returns Vector2 with each component multiplied by corresponding component
function Vector2.__mul(lhs, rhs)
    return Vector2.New(lhs.x * rhs.x, lhs.y * rhs.y)
end

--returns Vector2 with each component divided by corresponding component
function Vector2.__div(lhs, rhs)
    return Vector2.New(lhs.x / rhs.x, lhs.y / rhs.y)
end

--returns Vector2 translated (slid) by -Vector2 (also gives relative position of 1 to the other)
function Vector2.__sub(lhs, rhs)
    return Vector2.New(lhs.x - rhs.x, lhs.y - rhs.y)
end



return Vector2