Animate images between points

function love.load(arg)
    if arg and arg[#arg] == "-debug" then require("mobdebug").start() end
    rotace = 0
    points = {}
    points_mirror = {}

--    for i = 1,20 do
--        local x, y
--        points[#points+1] = { x=(100 + 10*i), y = (100 + (math.cos(0.5*i))*20)}
--    end
    local plus = 400;
    local minus = 520;

    points[#points+1] = { x = plus + 100, y = minus-87}
    points[#points+1] = { x = plus + 100, y = minus-130}
    points[#points+1] = { x = plus + 100, y = minus-195}
    points[#points+1] = { x = plus + 120, y = minus-273}
    points[#points+1] = { x = plus + 130, y = minus-322}
    points[#points+1] = { x = plus + 191, y = minus-356}
    points[#points+1] = { x = plus + 243, y = minus-367}
    points[#points+1] = { x = plus + 298, y = minus-353}
    points[#points+1] = { x = plus + 341, y = minus-315}
    points[#points+1] = { x = plus + 366, y = minus-271}
    points[#points+1] = { x = plus + 379, y = minus-220}
    points[#points+1] = { x = plus + 370, y = minus-166}
    points[#points+1] = { x = plus + 354, y = minus-115}
    points[#points+1] = { x = plus + 329, y = minus-73}

    local plus_mirror = 570
    local spodni_rozdil = - 25

    points_mirror[#points_mirror+1] = { x = plus_mirror - 100, y = minus-87 + spodni_rozdil}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 100, y = minus-130 + spodni_rozdil}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 100, y = minus-195 + spodni_rozdil}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 120, y = minus-273}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 130, y = minus-322}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 191, y = minus-356}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 243, y = minus-367}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 298, y = minus-353}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 341, y = minus-315}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 366, y = minus-271}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 379, y = minus-220}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 370, y = minus-166}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 354, y = minus-115}
    points_mirror[#points_mirror+1] = { x = plus_mirror - 329, y = minus-73}


    rockets = {}

    for i=1, #points do
        if i%3 == 0 then
            rockets[i] = love.graphics.newImage("1.png")
        elseif i%2 == 0 then
            rockets[i] = love.graphics.newImage("2.png")
        else
            rockets[i] = love.graphics.newImage("3.png")
        end

    end
    prubeh = 1
    pozadi = love.graphics.newImage("pozadi.png")
    love.graphics.setMode( 1041, 781)
end



function love.draw()
    love.graphics.draw(pozadi,0, 0, 0, 1, sx)

    love.graphics.setBackgroundColor(100, 150, 150, 255)
    for i=1, #points do
        animuj_mezi(i,prubeh)
    end

    love.graphics.print("Rotace: " ..rotace, 20, 20)

    prubeh = prubeh + 1
    if prubeh == 20 then
        prubeh = 0
        rotuj_pole()
    end
    love.timer.sleep(0.05)
    --
    -- Test
    --
    sirka = love.graphics.getWidth()
    vyska = love.graphics.getHeight()
    love.graphics.print("\Šířka: " .. sirka, 20, 40)
    love.graphics.print("\Výška: " ..vyska, 20, 60)
    --
    --
end

function animuj_mezi(i,prubeh)
    if i < #points then
        diff_x = points[i].x - points[i+1].x
        diff_y = points[i].y - points[i+1].y
    else
        diff_x = points[i].x - points[1].x
        diff_y = points[i].y - points[1].y
    end

    if i < #points then
        diff_x_mirror = points_mirror[i].x - points_mirror[i+1].x
        diff_y_mirror = points_mirror[i].y - points_mirror[i+1].y
    else
        diff_x_mirror = points_mirror[i].x - points_mirror[1].x
        diff_y_mirror = points_mirror[i].y - points_mirror[1].y
    end

    diff_x_mirror = (diff_x_mirror / 20)*prubeh
    diff_y_mirror = (diff_y_mirror / 20)*prubeh

    diff_x = (diff_x / 20)*prubeh
    diff_y = (diff_y / 20)*prubeh

    love.graphics.draw(rockets[i], points[i].x - (diff_x), points[i].y - (diff_y))
    love.graphics.draw(rockets[i], points_mirror[i].x - (diff_x_mirror), points_mirror[i].y - (diff_y_mirror))
end


function rotuj_pole()
    points_1st = points[1]
    points_1st_mirror = points_mirror[1]
    for i = 1, #points do
        if i < #points then
            points[i] = points[i+1]
            points_mirror[i] = points_mirror[i+1]
        else
            points[i] = points_1st
            points_mirror[i] = points_1st_mirror
        end

    end
    rotace = rotace +1
    if rotace == #points then rotace = 0 end
end