Icon Based Inventory

//****** Donations are greatly appreciated.  ******
//****** You can donate directly to Jesse through paypal at  https://www.paypal.me/JEtzler   ******

//Our inventory
var inventory : Array;

//This will be drawn when a slot is empty
public var emptyTex : Texture;

//the size of the inventory in x and y dimension
public var inventorySizeX = 8;
public var inventorySizeY = 5;

//The pixel size (height and width) of an inventory slot
var iconWidthHeight = 20;

//Space between slots (in x and y)
var spacing = 4;

//set the position of the inventory
public var offSet = Vector2( 100, 100 );

// TEST VARIABLES
// Assign these to test adding Items with mouse clicks (see Update())
public var testTex : Texture;
public var testTex2 : Texture;
static var hideInventory:boolean = false;

//Our Representation of an InventoryItem
class InventoryItem
{
    //GameObject this item refers to
    var worldObject : GameObject;
    //What the item will look like in the inventory
    var texRepresentation : Texture;
}

// Create the Inventory
function Awake()
{
    inventory = new Array(inventorySizeX);

        for( var i = 0; i < inventory.length; i ++ ) {
            inventory[i] = new Array(inventorySizeY);
        }
}

function OnGUI()
{
    var texToUse : Texture;
    var currentInventoryItem : InventoryItem;

if(hideInventory == false) {

    //Go through each row
    for( var i = 0; i < inventory.length; i ++ )
    {
        // and each column
        for( var k = 0; k < inventory[i].length; k ++ )
        {
            texToUse = emptyTex;
            currentInventoryItem = inventory[i][k];

            //if there is an item in the i-th row and the k-th column, draw it
            if( inventory[i][k] != null )
            {
                texToUse = currentInventoryItem.texRepresentation;
            }

            GUI.DrawTexture( new Rect( offSet.x+k*(iconWidthHeight+spacing), offSet.y+i*(iconWidthHeight+spacing), iconWidthHeight, iconWidthHeight ), texToUse );
        }
    }
    }
}

 function AddItem( item : InventoryItem )
{
     //Go through each row
    for( var i = 0; i < inventory.length; i ++ )
    {
        // and each column
        for( var k = 0; k < inventory[i].length; k ++ )
        {
            //If the position is empty, add the new item and exit the function
            if( inventory[i][k] == null )
            {
                 inventory[i][k] = item;
                 return;
            }
        }
    }

    //If we got this far, the inventory is full, do somethign appropriate here
}

function AddItem( worldObject : GameObject, texRep : Texture ) {
    var newItem = new InventoryItem();
    newItem.worldObject = worldObject;
    newItem.texRepresentation = texRep;
    AddItem( newItem );
}

function Update() {

    if(Input.GetKeyDown(KeyCode.K)) {
        AddItem( gameObject, testTex );
    }

    if(Input.GetKeyDown(KeyCode.L)) {
        AddItem( gameObject, testTex2 );
    }
}

function buyShopItem1 () {
    AddItem( gameObject, testTex );
}

function buyShopItem2() {

    AddItem( gameObject, testTex2 );
}