gistfile1.js

function update() {
    var npc_speed = 3; //seconds it takes to go from one tile to the next
    var npc_pos = 0; //position in array 
    var secs2 = 0; //seconds past since "starting walk"
    var pos = 0; //position in the pdata[i][1]

    for (var i in pdata) { //pdata array containing path tile sequence
        var path_data = pdata[i];
        var path = path_data[1];
        var lastWalk = path_data[2];
        
        secs = (login - lastWalk); //llogin & pdata[i][2] is time in seconds since epoch
        path_length = path.length; //the array of tiles

        if(secs > 100) { //only works after 100 seconds past from previous walk
            secs2 = secs - 100; //seconds past since the 100 seconds past 
            npc_pos = Math.floor(secs2 / npc_speed); //seconds past divided by speed = position in the array (rounded down)

            if(npc_pos == 0 || npc_pos == path_length) {
                //delete from array list;
            }

            if(npc_pos >= path_length) {  //once npc reaches end of path, start walking back to the start so reverse the position number downwards
                npc_pos = path_length - (npc_pos - path_length);
            }

            pos = path[npc_pos]; //with npc_pos get the X:Y stored in pdata[i][0] [array position]  = returns [4,6] as example

            if(pos != null && npc_pos > 0 && npc_pos < path_length) { // if npc is visible on map
                npc_array[0] = pos[0]; //tile X
                npc_array[1] = pos[1]; //tile Y
            }

            if(secs2 >= ( (path_length*2) * npc_speed)) { //once npc is home
                lastWalk = Math.floor(new Date().getTime() / 1000);     // update timer to repeat the loop seconds since epoch
                npc_pos = 0; //reset npc back to start position ready for next walk
            }
        }
        login = Math.floor(new Date().getTime() / 1000);  //seconds since epoch
        //debug('result','Seconds: '+secs+'<br/>'+'Seconds Two: '+secs2+'<br/>Pos: '+pos[0]);
    }
}