One Way Platforms and Bouncy Platforms

Assets/Images/Terrain/special_tiles.png.import

@@ -0,0 +1,40 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://gdcgbdiwbqkm"
+path="res://.godot/imported/special_tiles.png-255ed16611815f9bd3f797a6f3943b03.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://Assets/Images/Terrain/special_tiles.png"
+dest_files=["res://.godot/imported/special_tiles.png-255ed16611815f9bd3f797a6f3943b03.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

Scenes/Player/player.gd

@@ -1,6 +1,14 @@
 class_name Player
 extends CharacterBody2D
 
+enum {
+	NULL,
+	DEFAULT_LAYER,
+	ONE_WAY_LAYER,
+	BOUNCY_LAYER
+}
+
+
 @export var animated_sprite_2d: AnimatedSprite2D
 @export var player_name: Label
 
@@ -31,6 +39,7 @@ var is_infected: bool = false
 @onready var wall_check_left: RayCast2D = $WallCheckLeft
 @onready var wall_check_right: RayCast2D = $WallCheckRight
 @onready var infection_area: Area2D = $InfectionArea
+@onready var one_way_check: Area2D = $OneWayCheck
 @onready var fart_sound: AudioStreamPlayer = $FartSound
 
 
@@ -52,36 +61,86 @@ func _physics_process(delta: float) -> void:
 	# Only process input for the player we control
 	if not is_multiplayer_authority():
 		return
-
+	
 	# Apply gravity
 	if not is_on_floor():
 		velocity.y = min(velocity.y + get_gravity().y * gravity_scale * delta, max_fall_speed)
-
+	
 	# Track floor state for jump resets
 	if is_on_floor() and not was_on_floor:
 		_on_landed()
 	was_on_floor = is_on_floor()
 
+	#Handle one-way platforms
+	_handle_one_way()
+
 	# Handle wall sliding
 	_handle_wall_slide()
-
+	
 	# Handle jumping
 	_handle_jump()
-
+	
 	# Handle horizontal movement
 	_handle_movement(delta)
-
+	
 	# Apply movement
-	move_and_slide()
+	_apply_physics()
 
 	# Update animations
 	_update_animation()
 
 
+func _apply_physics() -> void:
+	# store velocity and position and then call move_and_slide()
+	var vel: Vector2 = velocity
+	var pos1: Vector2 = global_position
+	move_and_slide()
+
+	var pos2: Vector2 = global_position
+
+	var col: KinematicCollision2D = get_last_slide_collision()
+	if !col: return
+
+	# If it detects a bouncy thing, bounce.
+	if !(PhysicsServer2D.body_get_collision_layer(col.get_collider_rid()) & BOUNCY_LAYER):
+		var new_vel: Vector2 = _bouncy_col_math(vel, col.get_normal())
+		velocity = new_vel
+		move_and_slide()
+		_bouncy_position_correction(pos1, pos2, col.get_normal())
+
+		_on_landed()
+
+
+# when you call move_and_slide(), it steps the position forward in physics space. doing it a second time for the second move_and_slide() causes kinetic energy increases over time.
+# youve gotta correct the second move_and_slide() call so you dont gain energy by just bouncing. this puts you at the same distance you had to the surface before colliding.
+func _bouncy_position_correction(pos1: Vector2, pos2: Vector2, normal: Vector2) -> void:
+	global_position = pos2 - normal * (pos2 - pos1).dot(normal)
+
+
+# Does the math for a bouncy collision against a static object.
+func _bouncy_col_math(vel: Vector2, normal: Vector2) -> Vector2:
+	# First, project the vel vector onto the normal
+	# This shortened version  of projection math only works cuz we know normal is a unit vector
+	var proj: Vector2 = normal * vel.dot(normal)
+
+	#Then, we take that component and minus it twice off the current velocity. boom. elastic collision against static wall.
+	return vel - 2 * proj
+
+
+# Handles the one-way platform functionality.
+func _handle_one_way() -> void:
+	# The only time that a one way platform should have collision is when: its detected by the check, the player is moving downwards or resting, and the down direction is not pressed.
+	if one_way_check.has_overlapping_bodies() && velocity.y >= 0 && !Input.is_action_pressed("fall_through"):
+		# We set the collision by modifying our own collision layers.
+		set_collision_mask_value(ONE_WAY_LAYER,true)
+	else:
+		set_collision_mask_value(ONE_WAY_LAYER,false)
+
+
 # Handles horizontal movement with acceleration and friction
 func _handle_movement(delta: float) -> void:
 	var input_direction: float = Input.get_axis("move_left", "move_right")
-
+	
 	# Fallback to UI actions if custom actions don't exist
 	if input_direction == 0.0:
 		input_direction = Input.get_axis("ui_left", "ui_right")
@@ -184,7 +243,7 @@ func _update_animation() -> void:
 func _on_infection_area_body_entered(body: Node2D) -> void:
 	if not multiplayer.is_server() or not is_infected:
 		return
-
+	
 	if body is Player and not body.is_infected:
 		var game: Game = get_tree().get_first_node_in_group("game")
 		if game:

Scenes/Player/player.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=11 format=3 uid="uid://drqmqwoh706dl"]
+[gd_scene load_steps=12 format=3 uid="uid://drqmqwoh706dl"]
 
 [ext_resource type="Script" uid="uid://ds0q8ob5wehgr" path="res://Scenes/Player/player.gd" id="1_a3d8c"]
 [ext_resource type="SpriteFrames" uid="uid://cfy6mnakd0y3w" path="res://Scenes/Player/CharacterSprites/pink_man.tres" id="2_a3d8c"]
@@ -46,7 +46,10 @@ radius = 15.0
 
 [sub_resource type="CircleShape2D" id="CircleShape2D_7g0yx"]
 
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_mtuoh"]
+
 [node name="Player" type="CharacterBody2D" node_paths=PackedStringArray("animated_sprite_2d", "player_name")]
+collision_mask = 7
 script = ExtResource("1_a3d8c")
 animated_sprite_2d = NodePath("AnimatedSprite2D")
 player_name = NodePath("PlayerName")
@@ -99,3 +102,11 @@ target_position = Vector2(15, 0)
 [node name="FartSound" type="AudioStreamPlayer" parent="."]
 stream = ExtResource("4_mtuoh")
 volume_db = -15.0
+
+[node name="OneWayCheck" type="Area2D" parent="."]
+collision_layer = 0
+collision_mask = 2
+
+[node name="CollisionShape2D2" type="CollisionShape2D" parent="OneWayCheck"]
+position = Vector2(0, 25)
+shape = SubResource("RectangleShape2D_mtuoh")

project.godot

@@ -28,6 +28,10 @@ gdscript/warnings/untyped_declaration=1
 
 window/stretch/mode="viewport"
 
+[dotnet]
+
+project/assembly_name="Cooties"
+
 [file_customization]
 
 folder_colors={
@@ -58,6 +62,17 @@ jump={
 , Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194320,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
 ]
 }
+fall_through={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"location":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194322,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+
+[layer_names]
+
+2d_physics/layer_1="Default Collision"
+2d_physics/layer_2="One-Way Platforms"
 
 [physics]