function renderHeart(angle)
    local scale = 10

    for y = 2 * scale, -scale, -1 do
        local line = ""
        for x = -6 * scale, 7 * scale do
            if ((x / scale) ^ 2 + (y / scale) ^ 2 - 1) ^ 3 - (x / scale) ^ 2 * (y / scale) ^ 3 <= 0 then
                line = line .. "*"
            else
                line = line .. " "
            end
        end
        print(line)
    end
end

function main()
    local angle = 0
    while true do
        renderHeart(angle)
        angle = angle + 2
        os.sleep(0.1)
    end
end

main()