CC Turtle Square Wall

angle = math.asin(3.0 / 5.0);
sin = math.sin(angle);
cos = math.cos(angle);

local function rotateBack(vec)
    local vx = vec.x * (cos - sin);
    local vy = vec.y * (cos + sin);
    return vector.new(vx, vy);
end

local function getJitterDirY(position, inv1, inv2)
    local p = rotateBack(position);
    if p.y > inv2.y then
        return 1;
    elseif p.y < 0 then
        return -1;
    else
        return 0;
    end
end

args = {...};
width = tonumber(args[1]);

-- Initial position is (0,0)
position = vector.new(0, 0, 0);
inverted1 = rotateBack(vector.new(4, -3, 0)).mul(width);
inverted2 = rotateBack(vector.new(3, 4, 0)).mul(width);
lastX = inverted1.add(inverted2).x;

for xi = 0, lastX do
    local downDone = false;
    local upDone = false;

    while getJitterDirY(position, inverted1, inverted2) <= 0 do
        turtle.place();
        turtle.up();
        position.y += 1;
    end
    while getJitterY(position, inverted1, inverted2) >= 0 do
        if not turtle.detect() then
            turtle.place();
        end
        turtle.down();
        position.y -= 1;
    end
    turtle.turnRight();
    turtle.forward();
    turtle.turnLeft();
    position.x += 1;
end