Add leveling system demo for Godot 4.5

Author: razcore-rad

README.md

@@ -1,5 +1,6 @@
-# Demo: Savegames in Godot 4
+# Demo: Leveling System in Godot 4
 
-This project gives an example of how to save and load a game's state in Godot using resources and JSON.
+This project gives an example of how to make an RPG-style leveling system in Godot 4.
 
-For a detailed guide to get you started with saving and loading in Godot, check out the GDQuest Library: [Saving and loading games in Godot 4 (with resources)](https://gdquest.com/library/save_game_godot4/)
+<!-- TODO: add link to library guide -->
+For a detailed guide to get you started with saving and loading in Godot, check out the GDQuest Library: []()

character.gd

@@ -0,0 +1,46 @@
+extends Node
+
+# `growth_data` gets passed to the experience progress bar. The first value of the array
+# represents the value we animate the bar to, while the second is the maximum experience
+# value that the bar represents.
+signal experience_gained(growth_data: Array)
+
+# Character stats
+@export var max_hp := 12
+@export var strength := 8
+@export var magic := 8
+
+# Leveling system
+@export var level := 1
+
+var experience := 0
+var experience_total := 0
+var experience_required := get_required_experience(level + 1)
+
+
+func get_required_experience(for_level: int) -> int:
+	return roundi(pow(for_level, 1.8) + for_level * 4)
+
+
+func gain_experience(amount: int) -> void:
+	experience_total += amount
+	experience += amount
+	var growth_data := []
+	while experience >= experience_required:
+		experience -= experience_required
+		# In case that the amount of experience gained so far is greater than the required
+		# experience to level up, we need to fill the experience bar to the max. We repeat
+		# this process as long as `experience` is greater or equal with `epxerience_required`.
+		growth_data.append([experience_required, experience_required])
+		level_up()
+	growth_data.append([experience, experience_required])
+	experience_gained.emit(growth_data)
+
+
+func level_up() -> void:
+	level += 1
+	experience_required = get_required_experience(level + 1)
+
+	var stats: Array[String] = ["max_hp", "strength", "magic"]
+	var random_stat := stats[randi() % stats.size()]
+	set(random_stat, get(random_stat) + randi() % 4)

character.gd.uid

@@ -0,0 +1 @@
+uid://wdiq5bld7b1f

fonts/Montserrat-Medium.ttf

@@ -0,0 +1,36 @@
+[remap]
+
+importer="font_data_dynamic"
+type="FontFile"
+uid="uid://0ryos52rkkfa"
+path="res://.godot/imported/Montserrat-Medium.ttf-e832861e4ad4110e172112dc430c04b0.fontdata"
+
+[deps]
+
+source_file="res://fonts/Montserrat-Medium.ttf"
+dest_files=["res://.godot/imported/Montserrat-Medium.ttf-e832861e4ad4110e172112dc430c04b0.fontdata"]
+
+[params]
+
+Rendering=null
+antialiasing=1
+generate_mipmaps=false
+disable_embedded_bitmaps=true
+multichannel_signed_distance_field=false
+msdf_pixel_range=8
+msdf_size=48
+allow_system_fallback=true
+force_autohinter=false
+modulate_color_glyphs=false
+hinting=1
+subpixel_positioning=4
+keep_rounding_remainders=true
+oversampling=0.0
+Fallbacks=null
+fallbacks=[]
+Compress=null
+compress=true
+preload=[]
+language_support={}
+script_support={}
+opentype_features={}

fonts/Montserrat-Medium.ttf.import

@@ -0,0 +1,20 @@
+extends Node
+
+@onready var _character := %Character
+@onready var _label: Label = %Label
+@onready var _experience_bar: TextureProgressBar = %ExperienceBar
+
+
+func _ready() -> void:
+	_label.update_text(_character.level, _character.experience, _character.experience_required)
+	_experience_bar.initialize(_character.experience, _character.experience_required)
+
+
+func _unhandled_input(event: InputEvent) -> void:
+	if not event.is_action_pressed("ui_accept"):
+		return
+
+	# We just picked a random value to increase the experience by. Notice how the higher level
+	# need you to run this function multiple times before leveling up.
+	_character.gain_experience(34)
+	_label.update_text(_character.level, _character.experience, _character.experience_required)

game.gd

@@ -0,0 +1 @@
+uid://bor8mhwft1id0

game.gd.uid

@@ -0,0 +1,63 @@
+[gd_scene load_steps=6 format=3 uid="uid://bmekn0vlbo50k"]
+
+[ext_resource type="Script" uid="uid://bor8mhwft1id0" path="res://game.gd" id="1_7jktm"]
+[ext_resource type="Script" uid="uid://wdiq5bld7b1f" path="res://character.gd" id="2_ryrav"]
+[ext_resource type="PackedScene" uid="uid://c1yrk33055lj5" path="res://interface/experience_bar.tscn" id="3_eow3j"]
+[ext_resource type="FontFile" uid="uid://0ryos52rkkfa" path="res://fonts/Montserrat-Medium.ttf" id="4_j5wjh"]
+[ext_resource type="Script" uid="uid://b7mjuigbuvay8" path="res://label.gd" id="5_vef74"]
+
+[node name="Game" type="Node"]
+script = ExtResource("1_7jktm")
+
+[node name="Character" type="Node" parent="."]
+unique_name_in_owner = true
+script = ExtResource("2_ryrav")
+
+[node name="InterfaceControl" type="Control" parent="."]
+custom_minimum_size = Vector2(0, 120)
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="ColorRect" type="ColorRect" parent="InterfaceControl"]
+layout_mode = 0
+anchor_right = 1.0
+anchor_bottom = 1.0
+color = Color(0.238983, 0.251691, 0.320313, 1)
+
+[node name="ExperienceBar" parent="InterfaceControl" instance=ExtResource("3_eow3j")]
+unique_name_in_owner = true
+layout_mode = 1
+anchors_preset = -1
+anchor_left = 0.5
+anchor_top = 0.525
+anchor_right = 0.5
+anchor_bottom = 0.525
+offset_left = -430.5
+offset_top = -34.5
+offset_right = 430.5
+offset_bottom = 34.5
+grow_horizontal = 2
+grow_vertical = 2
+value = 28.0
+
+[node name="Label" type="Label" parent="InterfaceControl"]
+unique_name_in_owner = true
+modulate = Color(0.921569, 0.533333, 0.529412, 1)
+layout_mode = 0
+offset_left = 80.0
+offset_top = 80.0
+offset_right = 314.0
+offset_bottom = 249.0
+theme_override_fonts/font = ExtResource("4_j5wjh")
+theme_override_font_sizes/font_size = 32
+text = "Level: 4
+			Experience: 86
+			Next level: 23
+			"
+script = ExtResource("5_vef74")
+
+[connection signal="experience_gained" from="Character" to="InterfaceControl/ExperienceBar" method="_on_character_experience_gained"]

game.tscn

@@ -0,0 +1,40 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dny5vvkk2j0nu"
+path="res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.png"
+dest_files=["res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1