4.12 Connecting Signals Dynamically

project.godot

@@ -23,6 +23,10 @@ window/size/window_width_override=1440
 window/size/window_height_override=810
 window/stretch/mode="canvas_items"
 
+[global_group]
+
+traps="some kind of trap that causes player to take damage in various ways"
+
 [input]
 
 move_left={

scenes/level.tscn

@@ -79,5 +79,3 @@ position = Vector2(272, 163)
 position = Vector2(188, 113)
 
 [connection signal="body_entered" from="Deathzone" to="." method="_on_death_zone_body_entered"]
-[connection signal="touched_player" from="Traps/SawTrap" to="." method="_on_trap_touched_player"]
-[connection signal="touched_player" from="Traps/SpikeBallTrap" to="." method="_on_trap_touched_player"]

scenes/saw_trap.tscn

@@ -6,6 +6,21 @@
 [sub_resource type="CircleShape2D" id="CircleShape2D_1ysy5"]
 radius = 18.0
 
+[sub_resource type="Animation" id="Animation_gqn61"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Area2D/Sprite2D:frame")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [0]
+}
+
 [sub_resource type="Animation" id="Animation_0uemr"]
 resource_name = "spin"
 length = 0.400005
@@ -24,28 +39,13 @@ tracks/0/keys = {
 "values": [0, 1, 2, 3, 4, 5, 6, 7]
 }
 
-[sub_resource type="Animation" id="Animation_gqn61"]
-length = 0.001
-tracks/0/type = "value"
-tracks/0/imported = false
-tracks/0/enabled = true
-tracks/0/path = NodePath("Area2D/Sprite2D:frame")
-tracks/0/interp = 1
-tracks/0/loop_wrap = true
-tracks/0/keys = {
-"times": PackedFloat32Array(0),
-"transitions": PackedFloat32Array(1),
-"update": 1,
-"values": [0]
-}
-
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_q37r8"]
 _data = {
 "RESET": SubResource("Animation_gqn61"),
 "spin": SubResource("Animation_0uemr")
 }
 
-[node name="SawTrap" type="Node2D"]
+[node name="SawTrap" type="Node2D" groups=["traps"]]
 script = ExtResource("1_23awk")
 
 [node name="Area2D" type="Area2D" parent="."]

scenes/spike_ball_trap.tscn

@@ -6,6 +6,21 @@
 [sub_resource type="CircleShape2D" id="CircleShape2D_1ysy5"]
 radius = 11.0
 
+[sub_resource type="Animation" id="Animation_7h84l"]
+length = 0.001
+tracks/0/type = "value"
+tracks/0/imported = false
+tracks/0/enabled = true
+tracks/0/path = NodePath("Area2D:position")
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 0,
+"values": [Vector2(0, 0)]
+}
+
 [sub_resource type="Animation" id="Animation_qms3f"]
 resource_name = "move"
 length = 2.0
@@ -23,28 +38,13 @@ tracks/0/keys = {
 "values": [Vector2(0, 0), Vector2(100, 0)]
 }
 
-[sub_resource type="Animation" id="Animation_7h84l"]
-length = 0.001
-tracks/0/type = "value"
-tracks/0/imported = false
-tracks/0/enabled = true
-tracks/0/path = NodePath("Area2D:position")
-tracks/0/interp = 1
-tracks/0/loop_wrap = true
-tracks/0/keys = {
-"times": PackedFloat32Array(0),
-"transitions": PackedFloat32Array(1),
-"update": 0,
-"values": [Vector2(0, 0)]
-}
-
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_14ytm"]
 _data = {
 "RESET": SubResource("Animation_7h84l"),
 "move": SubResource("Animation_qms3f")
 }
 
-[node name="SpikeBallTrap" type="Node2D"]
+[node name="SpikeBallTrap" type="Node2D" groups=["traps"]]
 script = ExtResource("1_x0eb1")
 
 [node name="Area2D" type="Area2D" parent="."]

scripts/level.gd

@@ -3,6 +3,13 @@ extends Node2D
 @onready var player: CharacterBody2D = $Player
 @onready var start_position: Marker2D = $StartPosition
 
+func _ready() -> void:
+  var traps = get_tree().get_nodes_in_group("traps")
+
+  for trap in traps:
+    if trap is Trap:
+      trap.touched_player.connect(_on_trap_touched_player)
+
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta: float) -> void:

scripts/trap.gd

@@ -1,4 +1,5 @@
 extends Node
+class_name Trap
 
 signal touched_player