Roll20 API script to shake the screen, maybe for earthquake

ScreenShaker.js

/*  Screen Shake (really just maps, tokens, and paths)
    make a macro with the folloing body
    /w gm &{template:default} {{name=Screen Shaker}} {{[Start](!ScreenShake)}} {{[Shake With Time](!ScreenShake ?{time})}} {{[Stop](!ScreenShakeStop)}}
*/
on("ready", function() {
    var ScreenShakeEnabled = true;
    on("chat:message", function (msg) {
        if (msg.type === "api" && msg.content.split(' ')[0] === "!ScreenShake" && playerIsGM(msg.playerid))
        {
            var shakeTime = 0;
            var startTime = Date.now();
            if (msg.content.split(' ')[1]) { shakeTime = parseInt(msg.content.split(' ')[1]) * 1000; }
            ScreenShakeEnabled = true;
            var page = getObj('player', msg.playerid).get('_lastpage');
            var tokens = findObjs({type: 'graphic', pageid: page});
            var paths = findObjs({type: 'path', pageid: page});
            var tokensLeft = [];
            var tokensTop = [];
            var pathsLeft = [];
            var pathsTop = [];
            for (var i = 0; i < tokens.length; i++)
            {
                tokensLeft.push(tokens[i].get('left'));
                tokensTop.push(tokens[i].get('top'));
            }
            for (var j = 0; j < paths.length; j++)
            {
                pathsLeft.push(paths[j].get('left'));
                pathsTop.push(paths[j].get('top'));
            }

            var oInterval = setInterval(function() {
                if (ScreenShakeEnabled && (shakeTime == 0 || shakeTime > Date.now() - startTime)) 
                {
                    let randomWalkLeft = randomInteger(70);
                    let randomWalkTop = randomInteger(70);
                    for (var k = 0; k< tokens.length; k++)
                    {
                        tokens[k].set('left', tokensLeft[k] - 35 + randomWalkLeft);
                        tokens[k].set('top', tokensTop[k] - 35 + randomWalkTop);
                    }
                    for (var l = 0; l< paths.length; l++)
                    {
                        paths[l].set('left', pathsLeft[l] - 35 + randomWalkLeft);
                        paths[l].set('top', pathsTop[l] - 35 + randomWalkTop);
                    }
                }
                else 
                {
                clearInterval(oInterval);
                for (var k = 0; k< tokens.length; k++)
                {
                    tokens[k].set('left', tokensLeft[k]);
                    tokens[k].set('top', tokensTop[k]);
                }
                for (var l = 0; l< paths.length; l++)
                {
                    paths[l].set('left', pathsLeft[l]);
                    paths[l].set('top', pathsTop[l]);
                }
                }
            }, 150);

        }
        if (msg.type === "api" && msg.content === "!ScreenShakeStop" && playerIsGM(msg.playerid))
        {
            ScreenShakeEnabled = false;
        }
    });
});