reveal.js

history={'data': [
    {
        'o': 0, /* offset */
        'h': 1, /* horizontal slide index */
        'v': 0, /* vertical slide index */
    },
    {
        'o': 120,
        'h': 2,
        'v': 0,
    },
    {
        'o': 180,
        'h': 3,
        'v': 0,
    },
    {
        'o': 300,
        'h': 1,
        'v': 0,
    },
]}

var currentIndex = 2;

function getCurrentSlide(){
    return history['data'][currentIndex];
}
function getNextSlide() {
    return history['data'][currentIndex + 1];
}

function getStartOffSet(position) {
    return 0
} 

function setCurrentSlide(position) {
    var state = getCurrentState();
    var currentOffset = getStartOffset(position) + state['o'];
    var nextOffset = getStartOffset(position) + getNextState()['o'];
    if (position < currentOffset) {
        currentIndex -= 1;
    } else if (position > nextOffset) {
        currentIndex += 1;
    }
    setSlide();
}

function setSlide() {
    var slide = getCurrentSlide();
    reveal.slide(slide['h'], slide['v']);
}