--- title: "Feature Study: Diablo IV's Inventory" date: '2023-11-27' cover_image: "https://site-assets.gamedevartisan.com/posts/thumbnails/gd-fs-d4-inventory-v2-cover-v2.png" excerpt: "In this post we'll be performing a Feature Study of Diablo IV's Inventory system. We'll take a look at how the Itemization is composed and break down the elements with in the inventory and recreate a similar look and feel within Godot." author: "braydeejohnson" draft: false category: "game-design" tags: ["game-design", "godot", "feature-study", "ui", "inventory"] --- ## Introduction [anchor] As Game Developers we may be inspired to create based on something we see that excites us, or provides us with certain emotions. These inspirations may come from other games that we've played, but they may also come from other mediums that we enjoy. If we spend some time and study that medium, we enable ourselves to create something that is similar in nature or that shares in creativity. In this Feature Study, we'll be taking a look at Diablo IV's Character Panel and Inventory including aspects of it's Itemization. Our goal is to better understand how the latest installation of Diablo in the franchise accomplishes it's implementation of Items, Inventories, and the way that information is presented to a player via the UI components. We'll recreate these elements in Godot 4 to demonstrate how we can get the creative likeness by studying how Diablo IV is structured. This began as purely a UI study, but the more time I spent with the code and was building things out, the more I was inspired to replicate some of Diablo's Itemization. I really love what I ended up with, even though it's not fully functional and isn't something I would toss directly into a game. I ended up in quite the deep dive in the way Diablo's systems work and really wanted to get the same feel with the items in this example. Not only did that deep dive teach me a ton about Diablo, I learned a few things wtihin Godot that will be helpful for me moving forward. Hopefully as I review what I've done, you learn a few things new yourself! This is snapshot of some of my reference images I used and compiled within [PureRef][pure-ref-site]. ![pure-ref] ## Video [anchor] As always, feel free to follow along with the Video or read at your own pace here! ## Let's Examine [anchor] Diablo IV takes an approach at simplifying the Character screen by combining the Character's stats, equipment, and current Inventory into a single UI panel. This Character Panel can quickly be opened to provide information about our Characters Stats, which Gear is equipped on our Character and what new Loot we've picked up. We'll begin by taking the Character Panel and dividing it into smaller pieces that better outline the interface's building blocks: ## Character Details Section [anchor] Our Character Details section contains a small panel for stats one one side, and on the other we have our equipment section. ![ui-character-details] The Stat Panel has an overview of our Character and allows us to get a quick glance at some important information: ![ui-character-stats] Our Character's Level, Name and Title: ![ui-character-stats-name] Button's for accessing our Profile and additional Materials and Detailed Stats: ![ui-character-stats-buttons] Our Character's Primary Stats: ![ui-character-stats-primary] Our Character's Attributes: ![ui-character-stats-attributes] On the right side, we have the Equipment by slot for our Character, along with a preview of what our Character looks like. ![ui-character-equipment] We have the Equipment slots for Armor and Jewelry: ![ui-character-equipment-slots] Lastly we have our Weapon slots: ![ui-character-equipment-weapons] ## Inventories Section [anchor] The UI's Inventory section contains a tab for each category of Inventories, the Inventory Grid, and our various Currencies: ![ui-inventory] The Tabs allow us to switch between a specific Inventory Category (Equipment, Consumables, Quests, and Aspects) ![ui-inventory-tabs] The Inventory Grid for the current tab has a set number of slots based on the maximum amount of items our Inventory can store. Our Equipment inventory has 33 slots of storage that we can store on our character at a time. To give us more room, we must go to our Character's Stash to unload from any one of these inventories. ![ui-inventory-grid] Then breaking down our Currencies, we have a section for our Gold, Red Dust, and our Obols: | | | |:--- | ---:| |![ui-inventory-currencies] | ![ui-inventory-currencies-gold] | |![ui-inventory-currencies-red-dust] | ![ui-inventory-currencies-obols] | ## UI Creation [anchor] Now that we have studied the different components of Diablo's UI, we have a direction we can attempt to recreate it within Godot. We start with our UI scene and layout some Control nodes to break up our UI into the proper sections. The way we are dividing we can easily use the `MarginContainer` for padding and the `VBoxContainer` to distribute our sections between the top ***Character Details*** section and our ***Inventory*** section. We'll wrap each of those in their own parent control nodes as well and distribute them as we need to using the ***layout > container sizing > stretch ratio***. We'll use 3 and 2 respectively, which means our ***Character Details*** will take up 3/5ths of the container and the ***Inventory*** will use the remaining 2/5ths of the container. ![sections-node-tree] Note that we also have a `ColorRect` and `TextureRect` that we are using to define the background color and overlaying a texture for some detail. This is the technique I use a few times over to get a grainy feel on the background, without needing to create it external. To do this I set the `ColorRect` to the color I want to use, and then for the `TextureRect` I use a `NoiseTexture2D` and let that set the scale for the type of texture I'm going for. I use ***FastNoiseLite*** with a type of Perlin and tinker with the width and height to get the style I want. ![ui-textured-bg-setup] Next we have our ***Character Details*** nodes; a `MarginContainer` that contains a `HBoxContainer` for the ***Stats*** and ***Character Equipment*** sections. We also have a `Control` container for our ***Level*** display which in itself contains the same `ColorRect` and `TextureRect` configuration described previously. We again distribute the ***Stats*** and ***Character Equipment*** sections using the Stretch Ratio 1/3 and 2/3 respectively. ![node-tree-character-details] For our ***Stats*** section, we have a fair bit going on. Our ***Stats*** Control is a type of `VBoxContainer` to distribute our ***Nameplate***, ***Materials and Extra Stats***, ***Primary Stats***, and ***Attributes***. ![node-tree-stats] Each Node use a layout of `MarginContainer`s and `VBoxContainer` for alignments, but our ***Primary Stats*** and ***Attributes*** are both using some branched scenes that we've composed to make reusable. ## Stat Icon Scene [anchor] Our first custom scene is for our Stat's which include an icon, under our ***Primary Stats*** section. This contains an icon to highlight it's stat type, and contains a stat name and value. We will use our scene to export these values and create a reusable scene to simplify our Stats node tree. The Node Tree is small and the script is short with only a few behaviors. ![node-tree-stat-icon-item-container] ``` # stat_icon_item.gd @tool extends HBoxContainer @onready var stat_label: Label = %StatLabel @onready var value_label: Label = %ValueLabel @onready var icon_texture_rect: TextureRect = %IconTextureRect @export var stat_name: String = "Stat": set(value): stat_name = value _update_labels() @export var stat_value: int = 10: set(value): stat_value = value _update_labels() @export var stat_icon: Texture: set(value): stat_icon = value _update_labels() func _ready(): _update_labels() func _update_labels(): if stat_label: stat_label.text = stat_name if value_label: value_label.text = str(stat_value) if icon_texture_rect: icon_texture_rect.texture = stat_icon ``` Our ***StatIconItem*** has bindings to the labels for the Stat's Name and Value as well as the Icon `TextureRect` that we will modify. We'll export the `stat_name`, `stat_value`, and `stat_icon` variables and have setter methods that allow us to `_update_labels` and see them immediately in our editor thanks to the `@tool` definition at the top of our script defining this as a tool script that will run in editor. Our `_update_labels` function simply updates the correct nodes' values. ## Attribute Item Scene [anchor] Our next custom scene is for the Attribute items. This is a Name string and Value that we export and handle with a tool script: ![node-tree-attribute-item] ``` # attribute_item.gd @tool extends MarginContainer @onready var attribute_label: Label = %AttributeLabel @onready var value_label: Label = %ValueLabel @export var attribute_name: String = "Attribute": set(value): attribute_name = value _update_labels() @export var stat_value: int = 10: set(value): stat_value = value _update_labels() func _ready(): _update_labels() func _update_labels(): if attribute_label: attribute_label.text = attribute_name if value_label: value_label.text = str(stat_value) ``` ## Character Equipment [anchor] Now let's look at our ***Character Equipment*** section. We have a `ColorRect`, then we contain the rest within a `MarginContainer`. Inside here we have our **Paper Doll** for our Character, the background gradient shadow and the `VboxContainer` for our Equipment: Armor, Jewelry, and Weapons. These Slots are for our custom ***UIItemIcon*** which we will cover more in our [UI Item Icon][ui-item-icon-section] section within our Inventory. ![node-tree-character-equipment] Again note the layout is making use of `MarginContainer` for padding and `VBoxContainer` for list like alignment. Put this all together and so far it looks like this: ![character-details-section-preview] ## Inventory Grid [anchor] Our Inventory Section has a Node Tree containing the BG setup and a `VBoxContainer` for our ***Inventory Tabs***, ***Inventory Grid***, and our ***Currencies***. The Inventory stuff is contained within our `MarginContainer` and another `VboxContainer` thus spacing and stacking our Tabs above our ***InventoryGridContainer*** `Control` node. This ***Grid*** has a `ColorRect` bg with our ***Slot*** placeholders and the ***InventoryGrid*** using the `GridContainer` node and a custom script for generating the Inventory and it's Items. ![node-tree-inventory] With our Node Tree setup with all our `Control` nodes, we should have an inventory that looks like this: ![inventory-grid-section-preview] Our ***InventoryGrid*** will populate our ***Inventory*** instance and create the UI elements for each ***Item***. Let's look at the script from a high level perspective, then take a step back and review what we are going to implement for our Items and the Item's data structure. ``` # inventory_grid.gd extends GridContainer var ui_item: PackedScene = preload("res://ui/inventory/ui_item_icon.tscn") var prefixes: Array = [...] var suffixes: Array = [...] var inventory: Inventory func _ready() -> void: ... func _on_item_added(item: Item, _qty, _total) -> void: ... func _on_item_removed(item: Item, _qty, _total) -> void: ... func generate_item(category: Item.Category) -> Item: ... func generate_name(item: Item) -> String: ... ``` Our Grid holds a reference to an ***Inventory*** class, a `PackedScene` of our ***UIItemIcon***, and our functions deal with an ***Item*** class. ## Data Driven Items [anchor] This is the point in which this project was no longer only a UI study of Diablo IV and recreating that UI layout within Godot 4. I wanted to populate items both in the Character's Equipment slots, as well as within my fancy Inventory Grid. At first I started with the idea of mocking up a template of a single item or maybe a few icons of armor and weapons and then call it a day. I couldn't settle there, I had to have the full dopamine hit of random item **Rarities**, random rolled **Stats**, **Sockets**, **Gems**, and **Sacred** and **Ancestral** tiers! Not only did I want the Inventory icons to be randomized, I wanted to be able to hover each item icon and get the tooltip showing all my random stats, item name, the fancy colored borders and backgrounds to let me know how sweet my loot is, and all the extra details we may want to pack into our item descriptions. I wanted to see if I could not only mimic the UI, but also some of that fancy data structure that Diablo IV's itemization uses. ## Itemization Overview [anchor] Let's begin by examining Items in Diablo IV. If we look at the different ***Categories*** of ***Item***s, we have ***Gear*** (***Armor***, ***Weapon***s, and ***Jewelry***) and ***Socketable*** Items such as a ***Gem***. ![d4-item-tooltip] All ***Item***s at their core are going to have some common attributes: - Name - Rarity | Tier | Category - Image Icon - Description - Level Requirements - Tradable? - Class Restrictions - Account Bound? - Salvageable? - Value More information is required for our ***Jewelry***/***Armor***/***Weapon***/***Socketable***. Here we can define ***Gear*** to extend from an ***Item*** containing additional details such as: - Item Power - Upgrades (Current/Max) - Affix (Count/Rolled) - Socket (Count/Rolled) - Durability Even further we can extend ***Gear*** into ***Armor*** with it's own details such as the ***Type*** of ***Armor***: - Chest - Helm - Pants - Footwear - Gloves - Shield For the ***Weapons***, we'll also extend ***Gear*** and add it's ***Type***s: - Axe - Axe2H - Bow - Crossbow - Dagger - Offhand - Mace - Mace2H - Staff - Sword - Sword2H - Scythe - Scythe2H - Wand - Polearm ***Jewelry*** is either a Ring or Amulet ***Type***, but we'll still be extending ***Gear***. Another category of ***Item*** is ***Socketable***s and from that we can extend it into a ***Gem***. ***Gem*** has a ***Type*** and ***Quality*** Types: - Diamond - Saphire - Ruby - Emerald - Amethyst - Topaz Qualities: - Crude - Chipped - Normal - Flawless - Royal We've got ourselves the elements for what we need to create some new Custom Resources! ## Item Class [anchor] We will start with our Base class for ***Item*** -> `item.gd`: ``` # item.gd class_name Item extends Resource @export var name: String = "Item Name" @export var description: String @export var image: Texture @export var quantity: int = 1 @export var stackable: bool = false @export var value: int = 1 @export var rarity: Rarities = Rarities.Common @export var tier: Tiers = Tiers.Normal @export var level_requirement: int = 1 @export var is_account_bound: bool = false @export var salvageable: bool = true @export var tradable: bool = true @export_flags( "Barbarian", "Druid", "Necromancer", "Rogue", "Sorcerer",) var class_restrictions = 0 @export var inventory: Inventory var class_strings = "Classes: ": get: var class_string = [] for _id in Classes.size(): var _class = Classes.values()[_id] if _class and (class_restrictions & _class) == _class: var key = Classes.keys()[_id] class_string.append(str(key)) return ", ".join(class_string) var compound_category = "": get: return _get_compound_category() enum Classes { None = 0x0, Barbarian = 0x1, Druid = 0x2, Necromancer = 0x4, Rogue = 0x8, Sorcerer = 0x16, } enum Category { Item, Armor, Weapon, Jewelry, Gem } enum Tiers { Normal, Sacred, Ancestral } enum Rarities { Common, Magic, Rare, Legendary, Unique } static var RARITY_COLORS: Array[Color] = [ Color(.3, .3, .3, 1), Color(.18, .23, .63, 1), Color(.58, .5, .0, 1), Color(.56, .21, .0, 1), Color(.54, .34, .12, 1), ] func _get_compound_category() -> String: return "Item" func _get_type() -> String: return "Item" ``` For our base ***Item***, we setup `@export`s for our variables that we want to be able to modify on the resource. We also setup some helper variables that use a `getter` function to generate things like our ***class_strings*** and returning our ***compound_category*** from a function we can define on later class definitions. We also have some enumerators for our Character ***Classes***, ***Categories*** of Items, ***Tiers***, and ***Rarities***. We also setup the array of ***RARITY_COLORS*** to help setup the branding of our backgrounds and borders of our item icons in our UI. ## Gear Class [anchor] Next we'll extend our ***Item*** and define our ***Gear*** -> `gear.gd`: ``` # gear.gd class_name Gear extends Item @export var power: int = 0 @export var affix_count: int = 0 @export var equipped: bool = false static var AFFIX_COUNTS: Dictionary = { Rarities.Common: { "min": 0, "max": 0 }, Rarities.Magic: { "min": 1, "max": 2 }, Rarities.Rare: { "min": 2, "max": 4 }, Rarities.Legendary: { "min": 4, "max": 4 }, Rarities.Unique: { "min": 4, "max": 4 } } var upgrades: int = 0 var max_upgrades: int = 0: get: return _get_max_upgrades() var sockets: int = 0 var max_sockets: int = 1: get: return _get_max_sockets() var socketed: Array[Socketable] = [] var durability: int = 100 var max_durability: int = 100 var affixes: Array[Affix] = [ ] var breakpoint_tier: int: get: if power < 150: return 1 elif power < 340: return 2 elif power < 460: return 3 elif power < 625: return 4 elif power < 725: return 5 return 6 var min_ranges: Dictionary = { Tiers.Normal: 0, Tiers.Sacred: 600, Tiers.Ancestral: 685 } var max_ranges: Dictionary = { Tiers.Normal: 620, Tiers.Sacred: 720, Tiers.Ancestral: 820 } var rolled = false func _get_max_sockets(): return 1 func _get_max_upgrades(): match(tier): Tiers.Normal: match(rarity): Rarities.Common: return 0 Rarities.Magic: return 2 Rarities.Rare: return 3 Rarities.Legendary: return 4 Rarities.Unique: return 5 _: return 5 func _get_compound_category() -> String: var _tier = Tiers.keys()[tier] var _rarity = Rarities.keys()[rarity] return "{tier}{rarity}{type}".format({ "tier": "%s " % _tier if tier != Tiers.Normal else "", "rarity": "%s " % _rarity if rarity != Rarities.Common else "", "type": _get_type() }) func roll_affixes() -> void: affixes.clear() var affix_tier = AFFIX_COUNTS[rarity] for _i in randi_range(affix_tier.min, affix_tier.max): var has_affix = true var affix while(has_affix): affix = Affix.roll_affix() has_affix = affixes.any(func(a: Affix): return a.stat == affix.stat ) affixes.append(affix) func roll() -> void: sockets = randi_range(0, max_sockets) upgrades = randi_range(0, max_upgrades) roll_affixes() rolled = true func socket(item: Socketable) -> void: if socketed.size() < sockets: socketed.append(item) return ``` Our ***Gear*** has quite a bit going on, but this is where our Itemization really takes off. We are defining the structure for ***Item*** power, ***Affixes***, and other ***Gear*** specific variables. We setup some lower and upper limits to determine things like our ***AFFIX_COUNTS***, ***max_upgrades***, ***max_sockets***, ***breakpoint_tier***, Tier Ranges. We have some functions for setting up and rolling our item's stats: `roll` and `roll_affixes`; when we `roll()` we setup our number of ***sockets*** and ***upgrades*** for this item based on our ranges, then we slap on some ***Affixes*** by running our `roll_affixes()` function. This will leverage our ***Affix*** class to populate some strings in our description, no real behavior in this example, but fits in the UI nicely. ## Affix Class [anchor] ``` # affix.gd class_name Affix extends RefCounted @export var stat: String @export var type: Type @export var min_amount: float @export var max_amount: float @export var amount: float @export var template_string: String: get: match(type): Type.Percent: return "+{amount}% {stat}" Type.Stat: return "+{amount} {stat}" return "Affix Modifier" var label: String: get: return template_string.format({ "amount": ("%.2f" % amount) if (type == Type.Percent) else ("%d" % amount), "stat": stat.replace("_", " ") }) enum Type { Percent, Stat } enum Stat { Dexterity, Intelligence, Strength, Willpower, All_Stats } static var PERCENT_STATS: Dictionary = { "Total Armor": { "min": 2.0, "max": 4.8 }, "Damage": { "min": 4.4, "max": 10.0 }, "Attack Speed": { "min": 4.4, "max": 10.0 }, "Basic Skill Attack Speed": { "min": 4.4, "max": 10.0 }, } static func roll_affix() -> Affix: var affix = Affix.new() var affix_type = Type.values().pick_random() affix.type = affix_type var _stat var data match(affix_type): Type.Percent: _stat = PERCENT_STATS.keys().pick_random() data = PERCENT_STATS.get(_stat) affix.min_amount = data.min affix.max_amount = data.max affix.amount = randf_range(affix.min_amount, affix.max_amount) Type.Stat: _stat = Stat.keys().pick_random() affix.stat = _stat data = [ { "min": 28, "max": 42 }, { "min": 38, "max": 52 } ].pick_random() affix.min_amount = data.min affix.max_amount = data.max affix.amount = randi_range(int(affix.min_amount), int(affix.max_amount)) affix.min_amount = data.min affix.max_amount = data.max affix.amount = randf_range(affix.min_amount, affix.max_amount) affix.stat = _stat return affix ``` Our Affix code is a bit more involved so we can randomize based on flat percentages and stat based. The end result should be an Affix with a string that can be passed through a template. This structure can be extended much further to provide a mechanical benefit to our stat system if we wanted to flesh it out further for our needs! ## Armor Class [anchor] Luckily our ***Gear*** class handles the bulk of the heavy lifting for data and functions for what our equipment may need, but our ***Armor*** will have some unique distinctions: ``` # armor.gd class_name Armor extends Gear @export var type: Type = Type.Chest enum Type { Chest, Helm, Pants, Footwear, Gloves, Shield } static var ARMOR_TEXTURE: Texture = preload("res://assets/armor/armory.png") static var ARMOR_ICONS = { Type.Chest: [0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88], Type.Helm: [1, 9, 17, 25, 33, 41, 49], Type.Pants: [2, 10, 18, 26, 34], Type.Footwear: [3, 11, 19, 27, 35], Type.Gloves: [4, 12, 20, 28, 36, 44, 52], Type.Shield: [7, 15, 23, 31, 39, 47], } var category: Category = Category.Armor func _get_max_sockets() -> int: match(type): Type.Chest, Type.Pants: return 2 _: return 1 func _get_type() -> String: return Type.keys()[type] ``` Notice that we can define our ***Armor***'s type based on our ***Type*** enumerator. We also have a nice ***ARMOR_TEXTURE*** that we reference, along with the ***ARMOR_ICONS*** mapping frame indices to the specific ***Armor*** ***Type***. We also set the ***category*** as being the ***Armor*** Category. our `_get_max_sockets` function is defined as part of overriding our ***Gear*** implementation, which allows us to vary based on our ***Armor*** ***Type***. Lastly we override our `_get_type` function to be based on our ***Type*** enumerator. ## Weapon Class [anchor] Our ***Weapon*** class is almost identical in structure as our ***Armor*** class, instead we define our ***Weapon*** ***Types*** and use a new ***WEAPON_TEXTURE*** and it's mapping for ***WEAPON_ICONS***. The functions and ***category*** are all the same approach as our ***Armor*** implementation. ``` # weapon.gd class_name Weapon extends Gear @export var type: Type = Type.Axe var category: Category = Category.Weapon enum Type { Axe, Axe2H, Bow, Crossbow, Dagger, Offhand, Mace, Mace2H, Staff, Sword, Sword2H, Scythe, Scythe2H, Wand, Polearm } static var WEAPON_TEXTURE: Texture = preload("res://assets/armor/weapons.png") static var WEAPON_ICONS: Dictionary = { Type.Axe: [44,46,47,48,49], Type.Axe2H: [44,46,47,48,49], Type.Bow: [90,91,92,93,94,95,96,97,98,99], Type.Crossbow: [80,81,82,83,84,85,86,87,88,89], Type.Dagger: [30,31,32,34,36,37,38,39], Type.Offhand: [70,71,72,73,74,75,76,77,78,79], Type.Mace: [43,45,50,51,52,53,54,55,56,59], Type.Mace2H: [43,45,52,53,54,55,56,59], Type.Staff: [0,1,2,3,4,5,6,7,8,9], Type.Sword: [60,61,62,63,64,65,66,67,68,69], Type.Sword2H: [40,41,60,61,62,63,64,65,66,67,68,69,], Type.Scythe: [33,35], Type.Scythe2H: [33,35], Type.Wand: [10,11,12,13,14,15,16,17,18,19], Type.Polearm: [20,21,22,23,24,25,26,27,28,29], } func _get_max_sockets() -> int: match(type): Type.Axe2H, Type.Bow, Type.Crossbow, Type.Mace2H, Type.Staff, Type.Sword2H, Type.Scythe2H, Type.Polearm: return 2 _: return 1 func _get_type() -> String: match(type): Type.Axe2H: return "Two-Handed Axe" Type.Mace2H: return "Two-Handed Mace" Type.Sword2H: return "Two-Handed Sword" Type.Scythe2H: return "Two-Handed Scythe" return Type.keys()[type] ``` ## Jewelry Class [anchor] Big surprise, the ***Jewelry*** class is like the rest of our Gear, with only a Ring and Amulet type, the implementation is even easier! ``` # jewelry.gd class_name Jewelry extends Gear @export var type: Type = Type.Ring enum Type { Ring, Amulet } static var JEWELRY_TEXTURE: Texture = preload("res://assets/armor/armory.png") static var JEWELRY_ICONS = { Type.Ring: [5, 13, 21, 29], Type.Amulet: [6, 14, 22, 30], } var category: Category = Category.Jewelry func _get_max_sockets() -> int: return 2 func _get_type() -> String: return Type.keys()[type] ``` ## Socketable and Gem Classes [anchor] Let's look at our other ***Item*** types; ***Socketable***/***Gem*** class. First our ***Socketable*** is simply a new base class for future socketable ***Item***s: ***Gem***s and ***Hearts*** for Season 1, who know's what else we could add (Runes maybe?). ``` # socketable.gd class_name Socketable extends Item func _get_compound_category() -> String: return "Socketable" ``` Woah, so little code, what about our ***Gem***?: ``` # gem.gd class_name Gem extends Socketable @export var type: Type = Type.Diamond @export var quality: Quality = Quality.Crude: set(qual): quality = qual level_requirement = LEVEL_REQUIREMENTS[quality] enum Type { Diamond, Saphire, Ruby, Emerald, Amethyst, Topaz } enum Quality { Crude, Chipped, Normal, Flawless, Royal } var LEVEL_REQUIREMENTS = [ 15, 20, 40, 50, 60 ] var texture = preload("res://assets/armor/gem.png") var COLORS: Array[Color] = [ Color(.68, .66, .62), Color(0, .23, .96), Color(.8, .12, .16), Color(.07, .58, .05), Color(.51, 0, .81), Color(.83, .57, .15) ] var category: Category = Category.Gem var color: Color: get: return COLORS[type] func _init() -> void: stackable = true value = 4 image = texture func _get_compound_category() -> String: return "Gem" func _get_type() -> String: return Type.keys()[type] ``` Looks like our ***Gem*** class is doing a lot of the heavy lifting for socketables right now, but that's how things are for this example. If I had implemented more ***Socketable*** items, I'd likely extract those shared behaviors into our common class, but for now, ***Gem*** is all we have. A good consideration here is if the ***Socketable*** class is required then? I would say go with your gut, don't over complicate things if you don't need to, in my original run of this code, I didn't have a ***Socketable*** class, as only ***Gems*** were on my mind, so everything was based purely on ***Gem*** in the code, but I refactored that out to be based on ***Socketable*** instead when looking at a Gear's socket structures. As always, use your best judgements! ## Data Driven UI [anchor] Now that we've created our data structures for ***Item***s, let's look back our ***Inventory Grid*** and see how we leverage that data to build out our ***Inventory*** and drive our UI with it all. ``` # inventory_grid.gd extends GridContainer var ui_item: PackedScene = preload("res://ui/inventory/ui_item_icon.tscn") var prefixes: Array = [...] var suffixes: Array = [...] var inventory: Inventory func _ready() -> void: inventory = Inventory.new() ... func _on_item_added(item: Item, _qty, _total) -> void: ... func _on_item_removed(item: Item, _qty, _total) -> void: ... func generate_item(category: Item.Category) -> Item: ... func generate_name(item: Item) -> String: ... ``` First we've got our ***Inventory*** class -> `inventory.gd` ``` # inventory.gd class_name Inventory extends Resource signal item_added(item, qty, total) signal item_removed(item, qty, total) @export var max_capcity: int = 1 @export var items: Array[Item] = [] func _init(cap: int = 1): max_capcity = cap func find(item: Item) -> Item: var _id: int if item is Gem: var _items = items.filter( func(_item: Item): return _item is Gem and _item.type == item.type and _item.quality == item.quality ) if _items.size(): _id = items.find(_items.front()) else: return else: _id = items.find(item) if _id != -1: return items[_id] return func add(item: Item, qty: int = 1) -> void: var i = find(item) if !i: items.append(item) item.inventory = self i = item i.quantity = qty item_added.emit(i, qty, i.quantity) elif i.stackable: i.quantity += qty item_added.emit(i, qty, i.quantity) func remove(item: Item, qty: int = 1) -> void: var i = find(item) if !i: return if i.quantity >= qty: i.quantity -= qty item_removed.emit(item, qty, i.quantity) else: items.erase(item) item_removed.emit(item, qty, 0) func has(item: Item, minimum: int = 1) -> bool: return count(item) >= minimum func count(item: Item) -> int: var i = find(item) if i: return i.quantity return 0 func sort() -> void: items.sort_custom(func(a: Item, b: Item): if a.category < b.category: return true elif a.category == b.category: if a.type < b.type: return true elif a.type == b.type: if a is Gear and b is Gear: return a.power > b.power if a is Gem and b is Gem: return a.quality > b.quality return false ) ``` Here we have a data structure for storing our ***Item***'s and keeping track of when we add/remove 1 or more ***Item***. We have signals that we emit when an item is added or removed form our Inventory. We also have a convenient `sort` function that will organize our ***Inventory*** based on our custom function. Back in our ***Inventory Grid*** ``` # inventory_grid.gd extends GridContainer var ui_item: PackedScene = preload("res://ui/inventory/ui_item_icon.tscn") ... func _ready() -> void: inventory = Inventory.new() for i in range(randi_range(30, 33)): var item_data = generate_item([ Item.Category.Weapon, Item.Category.Weapon, Item.Category.Armor, Item.Category.Armor, Item.Category.Jewelry, Item.Category.Jewelry, Item.Category.Gem, ].pick_random()) inventory.add(item_data, item_data.quantity) inventory.sort() for item in inventory.items: _on_item_added(item, item.quantity, item.quantity) inventory.item_added.connect(_on_item_added) inventory.item_removed.connect(_on_item_removed) func _on_item_added(item: Item, _qty, _total) -> void: ... func _on_item_removed(item: Item, _qty, _total) -> void: ... func generate_item(category: Item.Category) -> Item: ... func generate_name(item: Item) -> String: ... ``` When our node is ready, we loop over a range of 30-33 items and call our `generate_item` function passing in a random item from our list. Then we take that generated item and add it to our ***Inventory*** then call `sort` once we've added all our items. Once we've sorted, we'll loop over the items and call our `_on_item_added` function, passing the item and it's quantity. We also want to connect our signals to the inventory so when we add or remove a new item, we can properly update our UI grid. Let's look at our `generate_*` functions: ``` # inventory_grid.gd ... func generate_item(category: Item.Category) -> Item: var item: Item var atlas: AtlasTexture = AtlasTexture.new() var type: int match(category): Item.Category.Gem: item = Gem.new() item.type = Gem.Type.values().pick_random() item.quality = Gem.Quality.values().pick_random() item.salvageable = false item.name = "{quality}{spacer}{type}".format({ "quality": "" if item.quality == Gem.Quality.Normal else Gem.Quality.keys()[item.quality], "spacer": "" if item.quality == Gem.Quality.Normal else " ", "type": Gem.Type.keys()[item.type] }) item.quantity = randi_range(1, 3) return item Item.Category.Armor: item = Armor.new() type = Armor.Type.values().pick_random() atlas.atlas = Armor.ARMOR_TEXTURE var i = Armor.ARMOR_ICONS[type].pick_random() atlas.region = Rect2((i % 8) * 32, (i / 8) * 32, 32, 32) Item.Category.Weapon: item = Weapon.new() type = Weapon.Type.values().pick_random() atlas.atlas = Weapon.WEAPON_TEXTURE var i = Weapon.WEAPON_ICONS[type].pick_random() atlas.region = Rect2((i % 10) * 24, (i / 10) * 24, 24, 24) Item.Category.Jewelry: item = Jewelry.new() type = Jewelry.Type.values().pick_random() atlas.atlas = Jewelry.JEWELRY_TEXTURE var i = Jewelry.JEWELRY_ICONS[type].pick_random() atlas.region = Rect2((i % 8) * 32, (i / 8) * 32, 32, 32) ... return item func generate_name(item: Item) -> String: var prefix = prefixes.pick_random() var suffix = suffixes.pick_random() return "{pre}{prefix_spacer}{type}{suffix_spacer}{suff}".format({ "pre": prefix, "prefix_spacer": "" if prefix == "" else " ", "type": item._get_type(), "suff": suffix, "suffix_spacer": "" if suffix == "" else " ", }) ``` Our function will take the category of Item we want to generate and match on that to populate the ***Gem*** and return, or if it's a type of ***Gear***, we'll create the proper ***Item*** class, set the ***type***, create the `AtlasTexture` from the proper `Texture` and ***region***, then the remaining common variables and return our generated item. ``` match(category): ... item.image = atlas item.type = type item.name = generate_name(item) item.power = randi_range(0, 820) item.value = randi_range(10000, 200000) item.rarity = Item.Rarities.values().pick_random() item.tier = Item.Tiers.values().pick_random() item.level_requirement = randi_range(0, 100) item.is_account_bound = randi_range(0,1) == 0 item.salvageable = true item.tradable = (item.rarity != Item.Rarities.Unique) item.roll() for socket in randi_range(0, item.sockets): var gem = generate_item(Item.Category.Gem) item.socket(gem) return item ``` We also are calling our `generate_name` function to get the proper string name of our item and set it to our item's details. Now let's look at those function's we've connected to our signals: ``` # inventory_grid.gd ... func _on_item_added(item: Item, _qty, _total) -> void: var ui_item_icon = ui_item.instantiate() as UIItemIcon ui_item_icon.item = item add_child(ui_item_icon) func _on_item_removed(item: Item, _qty, _total) -> void: for ui_icon in get_children() as Array[UIItemIcon]: if ui_icon.item == item: if _total == 0: remove_child(ui_icon) else: ui_icon._update_item_icon() ``` These functions help to create instances of our ***UIItemIcon*** and track those children and update when we remove the items from the ***Inventory***. ## UI Item Icon [anchor] Our ***UIItemIcon*** is our connection between data and the UI, we'll assign the ***Item*** to the ***item*** variable of our UI element, and it'll do the heavy lifting for mapping the data to the proper components, and delegating how we view our ***Tooltip*** as well. ![node-tree-ui-item-icon] Our Node Tree consists of our Root Control node, Our Item/Highlight/ItemIcon Textures, a QuantityLabel, and a container for our Sockets. These will all be mapped in code for binding data within our script -> `ui_item_icon.gd`. ``` # ui_item_icon.gd class_name UIItemIcon extends Control @export var item: Item: set(_item): item = _item item.changed.connect(_update_item_icon) @onready var item_texture: TextureRect = $ItemTexture @onready var item_icon_texture: TextureRect = $ItemIconTexture @onready var highlight_texture: TextureRect = $HighlightTexture @onready var quantity_label: Label = %QuantityLabel @onready var socket_controls: VBoxContainer = %Sockets var overlay_shader: ShaderMaterial = preload("res://ui/shaders/color_overlay_shader.tres") var SOCKET_SCENE = preload("res://ui/inventory/ui_socket.tscn") func _ready() -> void: _update_item_icon() func _update_item_icon() -> void: ... func _get_drag_data(_at_position: Vector2) -> Variant: ... func _can_drop_data(_at_position: Vector2, data: Variant) -> bool: ... func _drop_data(_position, data) -> void: ... ``` We `@export` out our ***Item*** variable with a setter function so we can connect to the ***Item***'s `changed` signal, letting us know the item's data may have changed, such as quantity. When this happens we call our `_update_item_icon` function, which is the staple of this script. After our `@onready` binds, we have our variables for the ***overlay_shader*** which is what we use to add some color shader to our bg texture. Our `color_overlay_shader.tres` `ShaderMaterial` has a shader -> `ui_item_icon.gdshader` ``` # ui_item_icon.gdshader shader_type canvas_item; uniform vec3 color = vec3(1.0, 1.0, 1.0); void fragment() { vec4 base = texture(TEXTURE, UV); vec4 blend = vec4(color, base.a); vec4 limit = step(0.5, base); COLOR = mix(2.0 * base * blend, 1.0 - 2.0 * (1.0 - base) * (1.0 - blend), limit); } ``` Our Shader is a Color mix of our base texture and our defined ***color*** shader parameter. We also have our ***SOCKET_SCENE*** to instance for each socket of this item -> `ui_socket.gd`. This NodeTree is a `Control` root, with a `TextureRect` for the ***Socket*** Background as well as the ***Gem*** `Texture`; which we'll bind a reference in code. ``` # ui_socket.gd class_name UISocket extends Control @export var item: Gem: set(_item): item = _item _update_gem() @export var gem_colors: Array[Color] = [ Color(.68, .66, .62), Color(0, .23, .96), Color(.8, .12, .16), Color(.07, .58, .05), Color(.51, 0, .81), Color(.83, .57, .15) ] @onready var gem: TextureRect = $Gem var overlay_shader: ShaderMaterial = preload("res://ui/shaders/color_overlay_shader.tres" ) func _ready() -> void: _update_gem() func _update_gem() -> void: if item: if gem and overlay_shader: gem.show() var shader_material = overlay_shader.duplicate() shader_material.set_shader_parameter("color", item.color) gem.material = shader_material else: gem.hide() ``` Our Socket will either show the gem with the shader applied based on our ***Item***'s color, or it'll hide the ***Gem*** `Texture`. In our `ui_item_icon.gd`'s `_ready` function, we're calling our `_update_item_icon` function. ``` # ui_item_icon.gd ... func _update_item_icon() -> void: var color: Color if item: if item is Gear: if !item.rolled: item.roll() var mat = overlay_shader.duplicate() as ShaderMaterial match(item.category): Item.Category.Gem: item_icon_texture.texture = Gem.GEM_TEXTURE mat.set_shader_parameter("color", item.color) item_icon_texture.material = mat color = Item.RARITY_COLORS[Item.Rarities.Common] var bg_mat = overlay_shader.duplicate() as ShaderMaterial bg_mat.set_shader_parameter("color", color) item_texture.material = bg_mat highlight_texture.hide() Item.Category.Weapon, Item.Category.Armor, Item.Category.Jewelry: color = Item.RARITY_COLORS[item.rarity] mat.set_shader_parameter("color", color) item_texture.material = mat item_icon_texture.texture = item.image item_icon_texture.material = null highlight_texture.visible = !(item.tier == Item.Tiers.Normal) highlight_texture.self_modulate = Color.PEACH_PUFF if item.tier == Item.Tiers.Sacred else Color.WHITE if item is Gear and item.sockets: for socket in socket_controls.get_children(): socket_controls.remove_child(socket) for i in item.sockets: var socket = SOCKET_SCENE.instantiate() as UISocket if item.socketed.size() > i: var gem: Gem = item.socketed[i] as Gem if gem: socket.item = gem socket_controls.add_child(socket) if item.stackable: if item.quantity > 1: quantity_label.show() else: quantity_label.hide() quantity_label.text = str(item.quantity) else: quantity_label.hide() if !mouse_entered.is_connected(UI.on_hover_item.bind(self)): mouse_entered.connect(UI.on_hover_item.bind(self)) if !mouse_exited.is_connected(UI.on_hover_leave.bind(self)): mouse_exited.connect(UI.on_hover_leave.bind(self)) ``` We ensure we have an item defined, and then if it's ***Gear*** we want to ensure we've rolled it's stats. Then we get a duplicate of our `ShaderMaterial` which for the ***Gem*** icon we'll apply the shader as we previously did for our ***UISocket*** scene. For the Icon's Background `Texture` we'll also set the material based on the item's rarity. For ***Gear*** we also have the ***highlight*** `Texture` which we show for Sacred and Ancestral Tiers. We loop over the ***Gear***'s sockets and create an instance of our ***UISocket*** and ensure we add it to the scene. Stackable ***Item***s will show a quantity label when the value is over 1. Last we ensure we have our Mouse events connected for our UI's functions! ## UI Tooltip [anchor] ``` # ui.gd class_name UI extends Control var tooltip: Tooltip var TOOLTIP_SCENE: PackedScene = preload("res://ui/tooltip/tooltip.tscn") static var _ui: UI func _ready() -> void: _ui = self if !_ui else _ui func _delete_tooltip() -> void: if _ui.tooltip and !_ui.tooltip.is_queued_for_deletion(): _ui.remove_child(_ui.tooltip) if _ui.tooltip.mouse_entered.is_connected(_ui.on_hover_item): _ui.tooltip.mouse_entered.disconnect(_ui.on_hover_item) if _ui.tooltip.mouse_exited.is_connected(_ui.on_hover_leave): _ui.tooltip.mouse_exited.disconnect(_ui.on_hover_leave) _ui.tooltip.queue_free() _ui.tooltip = null static func on_hover_item(item: UIItemIcon) -> void: if _ui: _ui._delete_tooltip() var tt: Tooltip = _ui.TOOLTIP_SCENE.instantiate() as Tooltip tt.item = item.item _ui.tooltip = tt tt.global_position.x = item.global_position.x - tt.size.x - 40 _ui.add_child(tt) static func on_hover_leave(_item: UIItemIcon) -> void: if _ui: _ui._delete_tooltip() ``` We setup a static reference to our ui, making this a singleton. There are many ways to tackle this piece, here I'm experimenting with Godot's static variables for our ***_ui*** variable. Note our `on_hover_*` functions; they delete and recreate our ***UI***'s ***tooltip*** scene and ensure it's position and item is properly defined based on which ***UIItemIcon*** ***Item*** we hover from our ***Inventory Grid***. These functions call over to our `_delete_tooltip` function for the cleanup and remove it from memory. Our ***Tooltip*** is also doing some data binding similar to the ***UIItemIcon*** and has a more involved Node SceneTree and accompanied script. ![node-tree-tooltip-root] ![node-tree-tooltip-info-panel] The ***Tooltip***'s Root is a `Control` node, and has a `VBoxContainer` to stack the `EquippedContainer` `Control` node for showing when our ***Item*** is equipped. This is done by a referenced `EquippedPlate` `Control` node containing a `ColorRect` background and `MarginContainer` for the `Texture` and `Label`. We'll toggle this visibility within our script. Our `InfoPanel` `Control` node contains the bulk of bound data. We have a `ColorRect` ***BG*** and `InfoContainer` `MarginContainer`, nesting it's own `ColorRect` BG and `MarginContainer`. This sets up the layers of Border, padding, and Background Graident `Texture`s: `GradientRect` and `BorderRect` which are each `NinePatchRect`s and will be referenced in code to apply our shader to it based on our ***Item Rarity***. Inside we have our `MarginContainer` for the `IconTexture` and the `VBoxContainer` for stacking the individual labels for our data binding to the ***Item*** properties; each of which is bound with a unique name to be referenced from within our script. ``` # tooltip.gd @tool class_name Tooltip extends Control @export var color: Color @export var item: Item @onready var equipped_plate: Control = %EquippedPlate @onready var info_container: MarginContainer = %InfoContainer @onready var bg: ColorRect = %BG @onready var icon_texture: TextureRect = %IconTexture @onready var item_name: RichTextLabel = %ItemName @onready var category: RichTextLabel = %Category @onready var power: RichTextLabel = %Power @onready var upgrades: RichTextLabel = %Upgrades @onready var stat_separator: HSeparator = %StatSeparator @onready var description: RichTextLabel = %Description @onready var stat: RichTextLabel = %Stat @onready var affix_separator: HSeparator = %AffixSeparator @onready var affix: RichTextLabel = %Affix @onready var level_requirement: RichTextLabel = %LevelRequirement @onready var account_bound: RichTextLabel = %AccountBound @onready var salvageable: RichTextLabel = %Salvageable @onready var tradable: RichTextLabel = %Tradable @onready var class_identifier: RichTextLabel = %ClassName @onready var price: HBoxContainer = %Price @onready var sell_value: RichTextLabel = %SellValue @onready var coin_icon: TextureRect = %CoinIcon @onready var durability: RichTextLabel = %Durability @onready var gradient_rect: NinePatchRect = %GradientRect @onready var border_rect: NinePatchRect = %BorderRect @onready var node_map: Dictionary = { ... } var SOCKET_CONTAINER: PackedScene = preload("res://ui/tooltip/socket_container.tscn") var overlay_shader: ShaderMaterial = preload("res://ui/shaders/color_overlay_shader.tres") var string_templates: Dictionary: get: ... var item_tokens: Dictionary: get: ... var hidden_nodes: Array: get: ... func _ready() -> void: _update_tooltip_values() func _update_tooltip_values() -> void: ... func _on_info_container_resized() -> void: ... ``` The bulk of our work for setting up our ***Tooltip*** happens on our `_update_tooltip_values` function, which we call when our node is ready: ``` # tooltip.gd ... func _update_tooltip_values() -> void: if !item: return icon_texture.texture = item.image var mat = overlay_shader.duplicate() as ShaderMaterial var col = Item.RARITY_COLORS[item.rarity] mat.set_shader_parameter("color", col) gradient_rect.material = mat border_rect.material = mat item_name.add_theme_color_override("default_color", col.lightened(.6)) category.add_theme_color_override("default_color", col.lightened(.6)) upgrades.add_theme_color_override("default_color", col.lightened(.6)) for key in node_map.keys(): var node = node_map.get(key) as RichTextLabel if node: var template: String = string_templates.get(key, "") node.text = template.format(item_tokens) if item: if hidden_nodes.has(key): node.visible = false else: match(key): "upgrades": node.visible = false if !(item is Gear) else item.upgrades > 0 "account_bound": node.visible = item.is_account_bound "power": if item is Gem: node.text = "" "salvageable": node.visible = !item.salvageable "tradable": node.visible = !item.tradable "class_identifier": node.visible = item.class_restrictions != 0 var last_node = stat if item is Gear: for _affix in item.affixes: var affix_node = affix.duplicate() affix_node.text = _affix.label last_node.add_sibling(affix_node) last_node = affix_node match(item.category): Item.Category.Gem: var gem_mat = overlay_shader.duplicate() as ShaderMaterial gem_mat.set_shader_parameter("color", item.color) icon_texture.material = gem_mat Item.Category.Weapon, Item.Category.Armor, Item.Category.Jewelry: for i in item.sockets: var socket = SOCKET_CONTAINER.instantiate() as SocketContainer if item.socketed.size() > i: var gem: Gem = item.socketed[i] as Gem if gem: socket.gem = gem last_node.add_sibling(socket) last_node = socket equipped_plate.visible = item is Gear and item.equipped info_container.force_update_transform() bg.set_deferred("size", Vector2(bg.size.x, info_container.get_rect().size.y)) ``` We are setting our icon's `Texture`, we setup our `ShaderMaterial` based on our ***Item Rarity***, this is applied to our ***gradient_rect*** and ***border_rect*** `Texture`s. We also set the `color_override` for the ***item_name***, ***category***, and ***upgrades*** `Label`. We map over our ***node_map*** and match any potential ***string_templates*** and toggle any visibility based on boolean states: ``` # tooltip.gd ... @onready var node_map: Dictionary = { "item_name": item_name, "category": category, "power": power, "upgrades": upgrades, "description": description, "stat": stat, "affix": affix, "level_requirement": level_requirement, "account_bound": account_bound, "salvageable": salvageable, "tradable": tradable, "class_identifier": class_identifier, "sell_value": sell_value, "durability": durability, } ... var string_templates: Dictionary: get: return { "item_name": "{item_name}{qty_string}", "category": "{compound_category}", "power": "{base_power}{bonus_power_string} Item Power", "upgrades": "[b]Upgrades[/b]: {current_upgrades}/{max_upgrades}", "description": "{description}", "stat": "Stat Modifier", "socket_label": "Empty Socket", "level_requirement": "Requires Level {level_requirement}", "account_bound": "Account Bound", "salvageable": "Cannot Salvage", "tradable": "Not Tradable", "class_identifier": "{class_identifier}", "sell_value": "[color=#d5af88]Sell Value[/color]: {sell_value}", "durability": "[color=#d5af88]Durability[/color]: {durability}/{max_durability}" } var item_tokens: Dictionary: get: if !item: return { "item_name": "Test Item 2000", "compound_category": "Sacred Legendary Gloves", "base_power": "700", "bonus_power_string": "+25" if true else "", "current_upgrades": 4, "max_upgrades": 5, "level_requirement": 80, "class_identifier": "Rogue", "sell_value": 14000 } else: var details: Dictionary = { "item_name": item.name, "qty_string": (" (%d)" % item.quantity) if (item.stackable and item.quantity > 1) else "", "compound_category": item.compound_category, "level_requirement": item.level_requirement, "class_identifier": str(item.class_strings), "sell_value": StringHelper.comma_sep(item.value), } if item is Gear: var extras: Dictionary = { "base_power": item.power, "bonus_power_string": "+{power}".format({"power": item.upgrades * 5}) if item.upgrades else "", "current_upgrades": item.upgrades if item is Gear else 0, "max_upgrades": item.max_upgrades if item is Gear else 0, "durability": item.durability, "max_durability": item.max_durability } details.merge(extras) if item is Gem: var extras: Dictionary = { "description": "Can be inserted into equipment with sockets." } details.merge(extras) return details var hidden_nodes: Array: get: var nodes = [] match(item.category): Item.Category.Gem: nodes.append_array([ "class_identifier", "stat", "durability" ]) _: nodes.append_array([ "description" ]) return nodes ... ``` Note how we are using a getter function to define some of our Dictionaries and their corresponding templates. We also loop over any ***Gear*** ***Affix***s and add the corresponding labels as we need inside our ***Stat*** list. Similar to our ***UIItemIcon***, we look at our ***Item Category*** and for ***Gem*** we setup the shader for the icon, for ***Gear***, we map our ***Sockets*** using our ***UISocket*** scene and add it to our scene tree. Last we setup our `Equipped Plate` visibility and update our container's sizing. ``` # tooltip.gd ... func _on_info_container_resized() -> void: if info_container and bg: bg.set_deferred("size", Vector2(bg.size.x, info_container.get_rect().size.y)) ``` We'll also ensure our signal is bound so when our info container is resized for any reason, we'll update the sizing again. Because our ***Tooltip*** is a tool script -> `@tool`, we can see a realtime preview in our Editor! ![tooltip-preview] And now that we have everything setup for ***Tooltips*** and ***UIItemIcons*** we can see it in action when we run our demo. Our ***Inventory Grid*** generates a full inventory, and when we hover over an ***Item*** within our grid, we can see our ***Tooltip*** showing that ***Item***'s details: ![tooltip-hover-demo] > Be sure to check out the great pixel art I've used in this example: [IdylWild's Armory][rpg-pixel-armors] and [DARA90's RPG WEAPONS][rpg-pixel-weapons]. ## Equipping Gems [anchor] What about all those `drag` related functions within our ***UIItemIcon***? Well that allows us to drag and drop ***Item***s around and depending on our logic allow behavior to occur, like say slapping a ***Gem*** into an empty socket of an ***Item***. ``` # ui_item_icon.gd ... func _get_drag_data(_at_position: Vector2) -> Variant: var preview = Control.new() var icon = item_icon_texture.duplicate() icon.self_modulate.a = .5 preview.add_child(icon) set_drag_preview(preview) return { item_id = "item", item = item} func _can_drop_data(_at_position: Vector2, data: Variant) -> bool: if data.item is Socketable: if item is Gear: if item.socketed.size() < item.sockets: return true return false func _drop_data(_position, data) -> void: if data.item is Socketable: if item is Gear: if item.socketed.size() < item.sockets: item.socket(data.item) if data.item.inventory: data.item.inventory.remove(data.item, 1) _update_item_icon() UI.on_hover_leave(self) UI.on_hover_item(self) ``` Our `_get_drag_data` function defines what happens when we start dragging an ***Item***. We'll set our dragging icon to our ***Item*** icon at half alpha. Then we return a data object that contains our ***item_id*** and ***item*** variable. This data object is passed between our `_can_drop_data` function and our `_drop_data` function. These test what we can do with the data object, in our case our ***Item*** we chose to drag around, and where we drag to. If we test if the ***Item*** we are dragging is of type ***Socketable*** and the current ***UIItemIcon***'s ***item*** we are dragging over is a type of ***Gear*** with free sockets, then we can drop. When we can and do drop our drag even onto a valid ***UIItemIcon***, we tell our ***Gem*** to remove from the inventory, and the ***Gear*** to apply the socket item, and update it's ***UIItemIcon*** to reflect the change. ![socketing-gems] ## Recap [anchor] ![full-demo-preview] To wrap it up, I threw together a fun dungeon scene using [Kenney's Dungeon Asset Pack][kenney-mini-dungeon-asset] and rendered it out as a static background. Added a `TextureRect` with this render as a background under our UI scene, and added a gradient to transition between the UI Character Details panel and our "Game" rendered image. This gives it a nice look and give's it a nice atmosphere to match our UI! With all that completed we can see that we have an exciting working prototype of Diablo IV's Itemization and UI likeness within our Godot 4 scene. Our implementation for Itemization lets us randomize the items based on the categories and types of items we may want, fancy UI Icons that update based on the data, as well as showing a Tooltip upon hovering over the icon. We can drag and drop icons around for a socket mechanism, and this could be used to drag and drop to organize the inventory, or swap gear in equipment slots, or whatever else you wanted to implement for your game; you could even reintroduce the grid based mechanic from older Diablo games and have fun with the tetris style approach! This project was much more invovled than our previous topics, but was really fun to work on. I hope you were able to take away some ideas on how to take an existing idea and break it down into understandable components and implement them for your games. [Join us over on our Discord][discord] if you want to discuss the project in more detail! If you want to support my work, consider sharing with others, [becoming a member or leaving a one time donation on Ko-fi][ko-fi]! Thanks for joining me on this adventure! Happy Coding. [//]: # (Place Reference Links Below) [discord]: https://discord.gg/p6fGxHEgrx [ko-fi]: https://ko-fi.com/gamedevartisan [kenney-mini-dungeon-asset]: https://kenney.nl/assets/mini-dungeon (Kenney's Mini Dungeon Asset Pack) [ui-item-icon-section]: #ui-item-icon-section (Our Custom UI Item Icon Scene) [cover-art]: https://site-assets.gamedevartisan.com/posts/thumbnails/gd-fs-d4-inventory-v2-cover-v2.png (Cover Art) [pure-ref-site]: https://www.pureref.com/ [pure-ref]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/pure-ref-snip.png (Snippet of my Reference images in Pure Ref) [ui-character-details]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-details.png (Character Details) [ui-character-equipment]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-equipment.png (Character Equipment) [ui-character-equipment-slots]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-equipment-slots.png (Character Equipment Slots) [ui-character-equipment-weapons]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-equipment-weapons.png (Character Equipment Weapons) [ui-character-stats]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-stats.png (Character Stats) [ui-character-stats-attributes]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-stats-attributes.png (Character Stats Attributes) [ui-character-stats-buttons]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-stats-buttons.png (Character Stats Buttons) [ui-character-stats-name]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-stats-name.png (Character Stats Name) [ui-character-stats-primary]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-character-stats-primary.png (Character Stats Primary) [ui-inventory-tabs]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-inventory-tabs.png (Inventory Tabs) [ui-inventory-grid]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-inventory-grid.png (Inventory Grid) [ui-inventory]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-inventory.png (Inventory) [ui-inventory-currencies]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-inventory-currencies.png (Inventory Currencies) [ui-inventory-currencies-gold]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-inventory-currencies-gold.png (Inventory Currencies Gold) [ui-inventory-currencies-obols]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-inventory-currencies-obols.png (Inventory Currencies Obols) [ui-inventory-currencies-red-dust]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-ui-inventory-currencies-red-dust.png (Inventory Currencies Red Dust) [sections-node-tree]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/sections-node-tree.png (Node Tree for our UI Sections) [socketing-gems]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/socketing-gems.gif (Socketing Gems into Gear) [ui-textured-bg-setup]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/ui-textured-bg-setup.png (Textured UI BG Inspector setup) [node-tree-character-details]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-character-details.png (Node Tree of our Character Details) [node-tree-stats]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-stats.png (Node Tree of our Stats Section) [node-tree-stat-icon-item-container]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-stat-icon-item-container.png (Node Tree for the Stat Icon Item Container) [node-tree-attribute-item]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-attribute-item.png (Node Tree for our Attribute Item) [node-tree-character-equipment]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-character-equipment.png (Node Tree for the Character Equipment) [character-details-section-preview]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/character-details-section-preview.png (Character Details Section Preview) [node-tree-inventory]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-inventory.png (Node Tree of our Inventory) [d4-item-tooltip]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/d4-item-tooltip.png (Example of Diablo IV's Tooltip for a piece of Jewelry) [inventory-grid-section-preview]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/inventory-grid-section-preview.png (Inventory Grid Section Preview) [node-tree-ui-item-icon]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-ui-item-icon.png (Node Tree for our UI Item Icon) [tooltip-preview]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/tooltip-preview.png (Preview of our Tooltip in the Editor) [node-tree-tooltip-root]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-tooltip-root.png (Node Tree Root for our Tooltip) [node-tree-tooltip-info-panel]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/node-tree-tooltip-info-panel.png (Node Tree Continued for the InfoPanel section of our Tooltip) [tooltip-hover-demo]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/tooltip-hover-demo.png (Tooltip Hover Demo in Action) [full-demo-preview]: https://site-assets.gamedevartisan.com/posts/game-design/feature-study/full-demo-preview.png (Full Preview of our Demo in Action) [rpg-pixel-weapons]: https://www.gamedevmarket.net/asset/rpg-weapons-24px (RPG Pixel Weapons by DARA90) [rpg-pixel-armors]: https://idylwild.itch.io/idylwilds-armory (IdylWild's Armory 50 Armor Icons 32x32)

Game Design

Feature Study: Diablo IV's Inventory