- mouse event on PC and touch event on Mobile.

main.js

var mobileStatus;
var agent = navigator.userAgent;

// check whether the device is mobile or not.
if(agent.search(/iPhone/) != -1 || agent.search(/iPad/) != -1 || agent.search(/iPod/) != -1 || agent.search(/Android/) != -1){
    mobileStatus = true;
}else{
    mobileStatus = false;
}


if(mobileStatus){
        document.addEventListener("touchstart", touch_start);
        document.addEventListener("touchmove", touch_move);
        document.addEventListener("touchend", touch_end);
    }else{
        document.addEventListener("mousedown", mouse_down);
        document.addEventListener("mousemove", mouse_move);
        document.addEventListener("mouseup", mouse_up);
}