Truncate title to single line & container width

Is there a way to truncate a title to the container width? I'm able to do truncate a long title to one line using the code below, but that doesn't really work for mobile.

h3
    ?php
        $thetitle = $post-post_title;
        $getlength = strlen($thetitle);
        $thelength = 33;
        echo substr($thetitle, 0, $thelength);
        if ($getlength  $thelength) echo "...";
    ?
/h3