actionscript 3 - Wrap items in a grid -

im making inventory system , iv managed add/remove , sort items on x axis. add , remove , resort them on 1 line. cant seem figure out how make go down 1 y space every 10 tiles, or so. im using method thing in game, idk.. ic ant figure out how inventory

                tile.x = tile_size * (i % 800);                 tile.y = tile_size * (j % 600); 

heres code adds items inventory

    protected function addinvitem(item:movieclip, c:class)     {         item = new c();         inventory.itemsininventory.push(item);         inventory.inventorysprite.addchild(item);         item.x = (inventory.itemsininventory.length-1)*40;         item.y = 0;         item.width = 30;         item.height = 25;         item.addeventlistener(mouseevent.click, inventory.useitem);     } 

this code deletes , sorts inventory when u click on item

    public function useitem(e:mouseevent)     {         var item:movieclip = movieclip(e.currenttarget);         inventorysprite.removechild(item);         itemsininventory.splice(itemsininventory.indexof(item), 1);         item.removeeventlistener(mouseevent.click, useitem);         sortinventory();     }     public function sortinventory()     {         (var i:int = 0; < itemsininventory.length; i++)         {             itemsininventory[i].x = * 40;         }     } 

use modular operator

var len:int = inventory.itemsininventory.length; item.x = 40 * (len%10); item.y = 40 * math.floor(len/10); 

your loop this:

for (var i:int = 0; < itemsininventory.length; i++) {     itemsininventory[i].x = 40 * (i%10);     itemsininventory[i].y = 40 * math.floor(i/10); }