var paused = false;

function pause() {
    paused = !paused;
}

function char1() {
    if (!paused) {
        updateState();
        draw()
        pause();
    }
};

function char2() {
    if (!paused) {
        updateState();
        draw()
        pause();
    }
};

function char3() {
    if (!paused) {
        updateState();
        draw()
        pause();
    }
};

setInterval(function() {
    char1();
    char2();
    char3();
}, 250)