Implemented fading transition between levels. Fixed respawn bug when falling out of bounds while gravity is flipped.

Scenes/fade.tscn

@@ -1,11 +0,0 @@
-[gd_scene format=3 uid="uid://ci0yqv1tna0ph"]
-
-[node name="Fade" type="CanvasLayer"]
-
-[node name="ColorRect" type="ColorRect" parent="."]
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-color = Color(1, 1, 1, 0)

Scenes/player.tscn

@@ -1,9 +1,10 @@
-[gd_scene load_steps=6 format=3 uid="uid://syx6ov00a585"]
+[gd_scene load_steps=7 format=3 uid="uid://syx6ov00a585"]
 
 [ext_resource type="Script" uid="uid://ohb2t6o7wr1u" path="res://Scripts/player.gd" id="1_cvnsp"]
 [ext_resource type="Texture2D" uid="uid://btqnhg54e1p66" path="res://Sprites/png/spritesheet.png" id="2_6t5aa"]
 [ext_resource type="Material" uid="uid://ck13qte606w1j" path="res://Materials/Particles/down_particles.tres" id="2_vgqql"]
 [ext_resource type="Script" uid="uid://de1fdvk35epdt" path="res://Scripts/player_camera.gd" id="4_vgqql"]
+[ext_resource type="PackedScene" uid="uid://botdddpmgoc8o" path="res://Scenes/scene_transition_rect.tscn" id="5_fkybt"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_jjgbg"]
 size = Vector2(16, 16)
@@ -32,14 +33,10 @@ rect = Rect2(-8, -8, 16, 16)
 top_level = true
 script = ExtResource("4_vgqql")
 
-[node name="Fade" type="CanvasLayer" parent="."]
-
-[node name="Rectangle" type="ColorRect" parent="Fade"]
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-color = Color(1, 1, 1, 0)
+[node name="SceneTransitionRect" parent="." instance=ExtResource("5_fkybt")]
+offset_left = -5000.0
+offset_top = -5000.0
+offset_right = 5000.0
+offset_bottom = 5000.0
 
 [connection signal="screen_exited" from="VisibleOnScreenNotifier2D" to="." method="_on_visible_on_screen_notifier_2d_screen_exited"]

Scenes/scene_transition_rect.tscn

@@ -0,0 +1,54 @@
+[gd_scene load_steps=5 format=3 uid="uid://botdddpmgoc8o"]
+
+[ext_resource type="Script" uid="uid://ndoq8wxl5da7" path="res://Scripts/scene_transition_rect.gd" id="1_mgv8w"]
+
+[sub_resource type="Animation" id="Animation_cqlxs"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath(".:color")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Color(1, 1, 1, 0)]
+}
+
+[sub_resource type="Animation" id="Animation_4152e"]
+resource_name = "fade"
+length = 1.5
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath(".:color")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 1.5),
+"transitions": PackedFloat32Array(1, 1),
+"update": 0,
+"values": [Color(1, 1, 1, 0), Color(1, 1, 1, 1)]
+}
+
+[sub_resource type="AnimationLibrary" id="AnimationLibrary_dhvso"]
+_data = {
+&"RESET": SubResource("Animation_cqlxs"),
+&"fade": SubResource("Animation_4152e")
+}
+
+[node name="SceneTransitionRect" type="ColorRect"]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+color = Color(1, 1, 1, 0)
+script = ExtResource("1_mgv8w")
+
+[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
+libraries = {
+&"": SubResource("AnimationLibrary_dhvso")
+}

Scripts/Levels/main.gd

@@ -2,3 +2,5 @@ extends Node2D
 
 var startPosX : int = 40
 var startPosY : int = 328
+
+var next_level : String = "res://Scenes/Levels/level_1.tscn"

Scripts/player.gd

@@ -1,9 +1,10 @@
 extends CharacterBody2D
 
-@onready var tile_layer : TileMapLayer = $"../TileMapLayer"
-@onready var level : Node2D = $".."
-@onready var particles : GPUParticles2D = $GPUParticles2D
-@onready var fade : ColorRect = $Fade/Rectangle
+@onready var current_level : Node2D = $".." #The current level.
+@onready var tile_layer : TileMapLayer = $"../TileMapLayer" #The tile map layer of the current level.
+@onready var particles : GPUParticles2D = $GPUParticles2D #The particles of the player.
+@onready var transition_rect : ColorRect = $SceneTransitionRect #The white rectangle used for fading in and out.
+@onready var transition_anim : AnimationPlayer = $SceneTransitionRect/AnimationPlayer #The animation player attached to the transition rectangle.
 
 @export_category("Movement")
 @export var acceleration : float = 50
@@ -14,11 +15,15 @@ var move_input : float
 var dead : bool
 
 func _ready() -> void:
+	#Triggers fade in animation, and then triggers respawn script.
+	transition_rect.fade_in()
 	respawn()
 
 func _physics_process(delta: float) -> void:
 	
+	#Only allows movement if the player is not considered dead.
 	if dead == false:
+		
 		#Horizontal movement.
 		move_input = Input.get_axis("move_left", "move_right")
 		if move_input != 0:
@@ -29,9 +34,11 @@ func _physics_process(delta: float) -> void:
 		#Vertical movement.
 		velocity.y += al_globals.gravity * delta
 		
+		#Gravity flip.
 		if Input.is_action_just_pressed("flip") and (is_on_floor() or is_on_ceiling()):
 			al_globals.gravity *= -1
 			
+	#If the player is moving downwards fast, turn on particles. Otherwise, disable them.
 	if velocity.y > 500 and not (is_on_floor() or is_on_ceiling()):
 		particles.emitting = true
 	else:
@@ -40,6 +47,7 @@ func _physics_process(delta: float) -> void:
 	move_and_slide() #Allow physics control.
 	tilemap_detection() #Checks for tiles with the "Spike" custom data enabled.
 	
+#Facilitates the detection and interaction with tiles on the tile map.
 func tilemap_detection() -> void:
 	#Adapted from Godot forum post.
 	
@@ -58,31 +66,59 @@ func tilemap_detection() -> void:
 		#Checks for exits.
 		var exit_data = tile_data.get_custom_data("exit")
 		if exit_data == true:
-			next_level(level.next_level) #Pulls next level data from parent Node2D.
+			next_level(current_level.next_level) #Pulls next level data from parent Node2D.
 			
+#Facilitates the death of the player.
 func death(fallen: bool) -> void:
+	
+	#Prevents movement.
 	dead = true
+	
+	#Checks if the player has not fallen out of bounds.
+	#If not, halt all current velocity, and shrink them down to 0 scale as a death animation.
 	if !fallen:
 		velocity.x = 0
 		velocity.y = 0
 		scale.x = lerp(scale.x, 0.0, 0.1)
 		scale.y = lerp(scale.y, 0.0, 0.1)
+		
+	#Sets the gravity back to default (downwards)
 	if al_globals.gravity < 0:
 		al_globals.gravity *= -1
+		
+	#Pauses for a second for effect, then triggers the respawn function.
 	await get_tree().create_timer(1.0).timeout
 	respawn()
 		
+#Facilitates the respawn of the player.
 func respawn() -> void:
-	dead = false
+	#Reset player velocity to 0, scale them back to full size.
+	velocity.y = 0
 	scale.x = lerp(scale.x, 1.0, 0.1)
 	scale.y = lerp(scale.y, 1.0, 0.1)
-	position.x = level.startPosX
-	position.y = level.startPosY
 	
-func next_level(level : String):
-	dead == true
+	#Change their position to the start position of the current level.
+	position.x = current_level.startPosX
+	position.y = current_level.startPosY
+	
+	#Mark them as alive.
+	dead = false
+	
+#Facilitates transitioning to the next level.
+#level = the path to the next level desired.
+func next_level(level : String) -> void:
+	#Prevent movement, and halt their current velocity.
+	dead = true
+	velocity.x = 0
+	velocity.y = 0
+	
+	#Trigger the fade out animation, and then change to the level specified.
+	transition_rect.fade_out()
+	await get_tree().create_timer(transition_anim.current_animation_length).timeout
 	get_tree().change_scene_to_file(level)
 	
+#Detects if the player fell out of view of the camera.
+#Most likely due to falling out of bounds.
 func _on_visible_on_screen_notifier_2d_screen_exited() -> void:
 	if !dead:
 		death(true)

Scripts/scene_transition_rect.gd

@@ -0,0 +1,9 @@
+extends ColorRect
+
+@onready var anim_player := $AnimationPlayer
+		
+func fade_in() -> void:
+	anim_player.play_backwards("fade")
+	
+func fade_out() -> void:
+	anim_player.play("fade")

Scripts/scene_transition_rect.gd.uid

@@ -0,0 +1 @@
+uid://ndoq8wxl5da7