Replay

Scenes/DownhillAutoscroller.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=15 format=2]
+[gd_scene load_steps=17 format=2]
 
 [ext_resource path="res://Tile Sets/SnowySlopes.tres" type="TileSet" id=1]
 [ext_resource path="res://Units/DownhillAutoscrollerPlayer.tscn" type="PackedScene" id=2]
@@ -11,6 +11,8 @@
 [ext_resource path="res://Sounds/sfx_jump_07-80241.mp3" type="AudioStream" id=9]
 [ext_resource path="res://Sounds/land2-43790.mp3" type="AudioStream" id=10]
 [ext_resource path="res://Sounds/ski-67717.wav" type="AudioStream" id=11]
+[ext_resource path="res://Scripts/Units/FollowReplay.gd" type="Script" id=12]
+[ext_resource path="res://Scripts/PlayerRecorder.gd" type="Script" id=13]
 
 [sub_resource type="Animation" id=3]
 resource_name = "InitialFade"
@@ -114,11 +116,16 @@ position = Vector2( 91, -197 )
 [node name="Camera2D" type="Camera2D" parent="Player"]
 offset = Vector2( 0, -15 )
 
+[node name="PlayerRecorder" type="Node" parent="Player"]
+script = ExtResource( 13 )
+
 [node name="SpectatorCam" type="Camera2D" parent="."]
 offset = Vector2( 0, -15 )
 
 [node name="Rival" parent="." instance=ExtResource( 6 )]
 position = Vector2( 91, -197 )
+script = ExtResource( 12 )
+unit_type = 0
 
 [node name="CanvasLayer" type="CanvasLayer" parent="."]
 

Scripts/PlayerRecorder.gd

@@ -0,0 +1,25 @@
+extends Node
+class_name PlayerRecorder
+
+var replay: ReplayRecording
+var this_frame: bool = true
+var sprite: int = 0
+var player: DownhillAutoscrollerPlayer
+
+export var save_to: String
+
+func _ready():
+	replay = ReplayRecording.new()
+	replay.time_per_frame = 1.0 / 30.0
+	player = get_parent()
+	player.recorder = self
+
+func _process(delta):
+	if this_frame:
+		this_frame = false
+		replay.positions.append(player.pos)
+		replay.sprites.append(sprite)
+		replay.frames += 1
+	
+	else:
+		this_frame = true

Scripts/ReplayRecording.gd

@@ -0,0 +1,53 @@
+extends Object
+class_name ReplayRecording
+
+var time_per_frame: float
+var frames: int = 0
+
+var positions: Array
+var sprites: Array
+
+func load_from(file: File):
+	time_per_frame = file.get_real()
+	frames = file.get_32()
+	positions = []
+	sprites = []
+	
+	for i in range(frames):
+		var x: float = file.get_real()
+		var y: float = file.get_real()
+		positions.append(Vector2(x, y))
+		sprites.append(file.get_8())
+
+func load_from_uri(uri: String):
+	var file: File = File.new()
+	file.open(uri, File.READ)
+	load_from(file)
+	file.close()
+
+func save_to(file: File):
+	file.store_real(time_per_frame)
+	file.store_32(frames)
+	
+	for i in range(frames):
+		file.store_real(positions[i].x)
+		file.store_real(positions[i].y)
+		file.store_8(sprites[i])
+
+func save_to_uri(uri: String):
+	var file: File = File.new()
+	file.open(uri, File.WRITE)
+	save_to(file)
+	file.close()
+
+func position(frame: int) -> Vector2:
+	if frame < frames:
+		return positions[frame]
+	else:
+		return positions[-1]
+
+func sprite(frame: int) -> int:
+	if frame < frames:
+		return sprites[frame]
+	else:
+		return sprites[-1]

Scripts/Unit.gd

@@ -35,6 +35,8 @@ var time_elapsed : float
 var is_flash : bool = false
 var flash_start_timestamp : float
 
+var recorder: PlayerRecorder = null
+
 # Called when the node enters the scene tree for the first time
 func _ready():
 	for action_num in Constants.UNIT_TYPE_ACTIONS[unit_type]:
@@ -243,6 +245,10 @@ func set_sprite(sprite_class : int, index : int = 0):
 	var true_index : int = index
 	if true_index > len(node_list) - 1:
 		true_index = 0
+	
+	if recorder != null:
+		recorder.sprite = (index << 3) | sprite_class
+	
 	var new_sprite : Node2D = node_list[true_index]
 	if (is_flash):
 		if int((time_elapsed - flash_start_timestamp) / Constants.FLASH_CYCLE) % 2 == 1:

Scripts/Units/DownhillAutoscrollerPlayer.gd

@@ -19,7 +19,6 @@ var jump_audiostream_player : AudioStreamPlayer
 var land_audiostream_player : AudioStreamPlayer
 var snow_audiostream_player : AudioStreamPlayer
 
-
 func init_unit_w_scene(scene):
 	.init_unit_w_scene(scene)
 	hit_audiostream_player = scene.get_node("HitAudioStreamPlayer")

Scripts/Units/FollowReplay.gd

@@ -0,0 +1,21 @@
+extends Unit
+
+var replay : ReplayRecording = null
+
+func process_unit(delta : float, time_elapsed : float):
+	self.time_elapsed = time_elapsed
+	
+	if replay != null:
+		handle_replay(time_elapsed)
+
+func handle_replay(at_time: float):
+	var frame: int = int(at_time / replay.time_per_frame)
+	var subframe: float = (at_time / replay.time_per_frame) - frame
+	
+	pos = lerp(replay.position(frame), replay.position(frame + 1), subframe)
+	
+	var sprite: int = replay.sprite(frame)
+	var index: int = sprite >> 3
+	sprite &= 7
+	
+	set_sprite(sprite, index)

Sounds/Beep.wav.import

@@ -17,5 +17,7 @@ force/max_rate=false
 force/max_rate_hz=44100
 edit/trim=false
 edit/normalize=false
-edit/loop=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
 compress/mode=0

Sounds/ski-67717.wav.import

@@ -17,5 +17,7 @@ force/max_rate=false
 force/max_rate_hz=44100
 edit/trim=false
 edit/normalize=false
-edit/loop=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
 compress/mode=0

project.godot

@@ -34,6 +34,16 @@ _global_script_classes=[ {
 "language": "GDScript",
 "path": "res://Scripts/Units/Player.gd"
 }, {
+"base": "Node",
+"class": "PlayerRecorder",
+"language": "GDScript",
+"path": "res://Scripts/PlayerRecorder.gd"
+}, {
+"base": "Object",
+"class": "ReplayRecording",
+"language": "GDScript",
+"path": "res://Scripts/ReplayRecording.gd"
+}, {
 "base": "Area2D",
 "class": "Unit",
 "language": "GDScript",
@@ -45,6 +55,8 @@ _global_script_class_icons={
 "NPCExample": "",
 "NPCUnit": "",
 "Player": "",
+"PlayerRecorder": "",
+"ReplayRecording": "",
 "Unit": ""
 }