профи поясните строчки и параметры скрипта

[johnm]

вот он сам:
import flash.display.*;
import flash.geom.*;
import flash.filters.*;
myBitmap = new BitmapData(390,400,false,0);
pt = new Point(0,0);
mpoint = new Point(0,0);
myDispl = new DisplacementMapFilter(myBitmap, mpoint,1,2,30,50);
water_mc.myList = new Array();
water_mc.myList.push(myDispl);
water_mc.filters = water_mc.myList;
i = 1;
this.onEnterFrame = function()
{
filterList = water_mc.filters;
offset = new Array();
offset[1] = new Object();
offset[1].x = i;
offset[1].y = i/8;
myBitmap.perlinNoise(45,5,3,50,true,false, 7,true,offset);
filterList.mapBitmap = myBitmap;
water_mc.filters = filterList;
i++;
}