OSBot Inventory Painter

    /*
     * Draws the rectangle bounds of the inventory items includes item names +
     * item id's in the middle of the bounds
     *
     * @Param g - g relates to the parameter of the OSBot painter interface
     * Visibility of this method public as it's in it's own class script is the
     * instance of the MethodProvider
     */

    public void paintInventory(Graphics g) {
        // Declaring the inventory
        Inventory inventory = script.client.getInventory();
        // Grabbing the items on the inventory interface
        Item[] inventoryItems = inventory.getItems();
        // Opening a list to keep track of the slot locations of items
        ArrayList<Integer> slots = new ArrayList<Integer>();
        // Opening a list to keep track of the slot's rectangle bounds
        ArrayList<Rectangle> rectangleDestinations = new ArrayList<Rectangle>();

        // Null check + length check
        if (inventoryItems != null && inventoryItems.length > 0) {
            // Illiterating through the array of items
            for (int i = 0; i < inventoryItems.length; i++) {
                // Null checking the item
                if (inventoryItems[i] != null)
                    // Adding the slot to the list we opened before
                    slots.add(inventory.getSlotForId(inventoryItems[i].getId()));
            }
        }

        // Null check + length check on the slots of the inventory
        if (slots != null && slots.size() > 0) {
            // Illiterating through the inventory slots
            for (int i : slots) {
                // Adding the rectangle bounds of the slots to the list
                rectangleDestinations.add(inventory.getDestinationForSlot(i));
            }
        }

        // Null + Length check on the rectangle bounds of slots
        if (rectangleDestinations != null && rectangleDestinations.size() > 0) {
            // Illiterating through the rectangle bound list
            for (Rectangle r : rectangleDestinations) {
                // Illiterating through the inventory items
                for (Item item : inventoryItems) {
                    // Null check of the rectangle bounds
                    if (r != null) {
                        // Setting a easily visible colour
                        g.setColor(Color.BLACK);
                        // Drawing the rectangle bounds
                        g.drawRect(r.x, r.y, r.width, r.height);
                    }
                    // Null check of the item and checking that the slot of item
                    // is equal to r
                    if (item != null
                            && (inventory.getDestinationForSlot(inventory
                                    .getSlotForId(item.getId())).equals(r))) {
                        // Setting to another easily visible colour
                        g.setColor(Color.WHITE);
                        // Constructing a font with bold text
                        Font font = new Font(Font.SANS_SERIF, Font.PLAIN, 10);
                        // Setting the font we just constructed
                        g.setFont(font);
                        // Null check of the item's name
                        if (item.getName() != null) {
                            // Drawing the text in the middle of the rectangle
                            g.drawString("" + item.getName(), r.x
                                    + (r.width / 2), r.y + (r.height / 2));
                        }
                        // Checking if the item has an ID
                        if (item.getId() != 0) {
                            // Drawing the Item ID under the item name
                            // - 8 on the x due to the font metrics
                            g.drawString("" + item.getId(),
                                    r.x + (r.width / 2), r.y - 5
                                            + (r.height / 2) - 10);
                        }

                    }
                }
            }
        }

    }