Player health UI is bound to singleton

Global/InGameState.gd

@@ -7,6 +7,7 @@ var player_count: int
 
 signal player_win(player_id)
 signal player_count_updated(new_player_count)
+signal player_health_updated(player_id, new_player_health)
 
 
 func set_player_count(new_player_count: int):
@@ -16,16 +17,23 @@ func set_player_count(new_player_count: int):
 	player_healths = []
 	
 	for i in range(0, player_count):
-		player_healths.append(max_health)
+		player_healths.append(0.0)
+		set_player_health(i, max_health)
 	
 	emit_signal("player_count_updated", new_player_count)
 
 
 func subtract_player_health(player_id, subtractor):
+	set_player_health(player_id, player_healths[player_id] - subtractor)
+
+
+func set_player_health(player_id, new_value):
 	assert(player_id < player_count)
 	assert(player_id >= 0)
 	
-	player_healths[player_id] -= subtractor
+	player_healths[player_id] = new_value
 	
 	if player_healths[player_id] < 0.0:
 		emit_signal("player_win", player_id)
+	else:
+		emit_signal("player_health_updated", player_id, player_healths[player_id])

Ingame/Ingame.gd

@@ -0,0 +1,16 @@
+extends Spatial
+
+
+# Declare member variables here. Examples:
+# var a: int = 2
+# var b: String = "text"
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	InGameState.set_player_count(2)
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+#func _process(delta: float) -> void:
+#	pass

Ingame/Testing.tscn

@@ -1,7 +1,9 @@
-[gd_scene load_steps=5 format=2]
+[gd_scene load_steps=7 format=2]
 
 [ext_resource path="res://BodyParts/Arm.tscn" type="PackedScene" id=1]
+[ext_resource path="res://UI/UI.tscn" type="PackedScene" id=2]
 [ext_resource path="res://BodyParts/BodyBase/BodyBase.tscn" type="PackedScene" id=3]
+[ext_resource path="res://Ingame/Ingame.gd" type="Script" id=4]
 
 [sub_resource type="PlaneMesh" id=1]
 size = Vector2( 10, 10 )
@@ -9,7 +11,8 @@ size = Vector2( 10, 10 )
 [sub_resource type="BoxShape" id=2]
 extents = Vector3( 5, 1, 5 )
 
-[node name="Spatial" type="Spatial"]
+[node name="InGame" type="Spatial"]
+script = ExtResource( 4 )
 
 [node name="MeshInstance" type="MeshInstance" parent="."]
 transform = Transform( 10, 0, 0, 0, 10, 0, 0, 0, 10, 0, 0, 0 )
@@ -38,4 +41,6 @@ key = 83
 [node name="Arm" parent="Torso/FrontRight" index="1" instance=ExtResource( 1 )]
 key = 65
 
+[node name="UI" parent="." instance=ExtResource( 2 )]
+
 [editable path="Torso"]

UI/PlayerHealth.gd

@@ -0,0 +1,21 @@
+extends ProgressBar
+
+
+export(int) var player_id
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	InGameState.connect("player_health_updated", self, "_on_player_health_updated")
+	
+	max_value = InGameState.max_health
+
+
+func _on_player_health_updated(updated_id, updated_health):
+	if player_id == updated_id:
+		value = updated_health
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+#func _process(delta: float) -> void:
+#	pass

UI/UI.tscn

@@ -1,4 +1,6 @@
-[gd_scene format=2]
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://UI/PlayerHealth.gd" type="Script" id=1]
 
 [node name="UI" type="Control"]
 anchor_right = 1.0
@@ -33,13 +35,14 @@ __meta__ = {
 
 [node name="HSplitContainer" type="HSplitContainer" parent="MarginContainer/PlayerHealthController/VSplitContainer"]
 margin_right = 984.0
-margin_bottom = 546.0
+margin_bottom = 560.0
 split_offset = 492
 dragger_visibility = 1
 
 [node name="Player1Health" type="ProgressBar" parent="MarginContainer/PlayerHealthController/VSplitContainer/HSplitContainer"]
 margin_right = 496.0
 margin_bottom = 14.0
+script = ExtResource( 1 )
 __meta__ = {
 "_edit_use_anchors_": false
 }
@@ -48,11 +51,13 @@ __meta__ = {
 margin_left = 508.0
 margin_right = 984.0
 margin_bottom = 14.0
+script = ExtResource( 1 )
 __meta__ = {
 "_edit_use_anchors_": false
 }
 
 [node name="HSplitContainer2" type="HSplitContainer" parent="MarginContainer/PlayerHealthController/VSplitContainer"]
+visible = false
 margin_top = 546.0
 margin_right = 984.0
 margin_bottom = 560.0

project.godot

@@ -36,6 +36,10 @@ config/name="BodyPartFighter"
 run/main_scene="res://Ingame/Testing.tscn"
 config/icon="res://icon.png"
 
+[autoload]
+
+InGameState="*res://Global/InGameState.gd"
+
 [rendering]
 
 environment/default_environment="res://default_env.tres"