work for lesson 8: finishing up

game_over_screen.gd

@@ -0,0 +1,11 @@
+extends Node2D
+
+func _ready() -> void:
+  $CanvasLayer/VBoxContainer/Label2.text = "YOUR SCORE: "+str(Global.score)
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(_delta: float) -> void:
+  if Input.is_action_just_pressed("laser"):
+    Global.score = 0
+    get_tree().change_scene_to_file("res://level.tscn")

game_over_screen.tscn

@@ -1,8 +1,10 @@
-[gd_scene load_steps=2 format=3 uid="uid://cngln1r230py"]
+[gd_scene load_steps=3 format=3 uid="uid://cngln1r230py"]
 
+[ext_resource type="Script" path="res://game_over_screen.gd" id="1_gjpts"]
 [ext_resource type="PackedScene" uid="uid://c23nfyyeioxcv" path="res://bg.tscn" id="1_xlemo"]
 
 [node name="GameOverScreen" type="Node2D"]
+script = ExtResource("1_gjpts")
 
 [node name="CanvasLayer" type="CanvasLayer" parent="."]
 

global.gd

@@ -0,0 +1,3 @@
+extends Node
+
+var score := 0

laser.tscn

@@ -8,6 +8,8 @@ radius = 5.0
 height = 54.0
 
 [node name="Laser" type="Area2D"]
+collision_layer = 2
+collision_mask = 0
 script = ExtResource("1_je83x")
 
 [node name="Sprite2D" type="Sprite2D" parent="."]

level.gd

@@ -5,6 +5,8 @@ var laser_scene: PackedScene = load("res://laser.tscn")
 var star_scene: PackedScene = load("res://star.tscn")
 var num_stars = 100
 
+var health = 3
+
 func _ready():
   var rng := RandomNumberGenerator.new()
   var width = get_viewport().get_visible_rect().size[0]
@@ -23,6 +25,14 @@ func _on_meteor_timer_timeout() -> void:
   var meteor = meteor_scene.instantiate()
   $Meteors.add_child(meteor)
 
+  meteor.connect('collision',_on_meteor_collision)
+
+func _on_meteor_collision():
+  health -= 1
+  get_tree().call_group('ui','set_health',health)
+  if health == 0:
+    get_tree().change_scene_to_file("res://game_over_screen.tscn")
+
 func _on_player_laser(pos) -> void:
   var laser = laser_scene.instantiate()
   $Lasers.add_child(laser)

level.tscn

@@ -3,7 +3,7 @@
 [ext_resource type="Script" path="res://level.gd" id="1_6hg4u"]
 [ext_resource type="PackedScene" uid="uid://cxw7wbwterb7u" path="res://player.tscn" id="1_48d8j"]
 [ext_resource type="PackedScene" uid="uid://c23nfyyeioxcv" path="res://bg.tscn" id="2_gvq1c"]
-[ext_resource type="Texture2D" uid="uid://mw23y37wfrjm" path="res://assets/PNG/UI/playerLife1_blue.png" id="3_kfkpw"]
+[ext_resource type="PackedScene" uid="uid://d2kq441mv37fr" path="res://ui.tscn" id="4_53jg4"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_abc51"]
 size = Vector2(40, 1080)
@@ -27,6 +27,7 @@ metadata/_edit_lock_ = true
 metadata/_edit_lock_ = true
 
 [node name="StaticBody2D" type="StaticBody2D" parent="Borders"]
+collision_mask = 0
 
 [node name="Right Wall" type="CollisionShape2D" parent="Borders/StaticBody2D"]
 position = Vector2(1900, 540)
@@ -53,43 +54,7 @@ autostart = true
 [node name="Lasers" type="Node2D" parent="."]
 metadata/_edit_lock_ = true
 
-[node name="CanvasLayer" type="CanvasLayer" parent="."]
+[node name="UI" parent="." instance=ExtResource("4_53jg4")]
-
-[node name="MarginContainer" type="MarginContainer" parent="CanvasLayer"]
-anchors_preset = 1
-anchor_left = 1.0
-anchor_right = 1.0
-offset_left = -40.0
-offset_bottom = 85.0
-grow_horizontal = 0
-theme_override_constants/margin_top = 16
-
-[node name="Label" type="Label" parent="CanvasLayer/MarginContainer"]
-layout_mode = 2
-theme_override_font_sizes/font_size = 50
-text = "0"
-horizontal_alignment = 2
-
-[node name="MarginContainer2" type="MarginContainer" parent="CanvasLayer"]
-offset_right = 40.0
-offset_bottom = 40.0
-theme_override_constants/margin_left = 16
-theme_override_constants/margin_top = 16
-
-[node name="HBoxContainer" type="HBoxContainer" parent="CanvasLayer/MarginContainer2"]
-layout_mode = 2
-theme_override_constants/separation = 12
-
-[node name="TextureRect" type="TextureRect" parent="CanvasLayer/MarginContainer2/HBoxContainer"]
-layout_mode = 2
-texture = ExtResource("3_kfkpw")
-stretch_mode = 3
-
-[node name="Label" type="Label" parent="CanvasLayer/MarginContainer2/HBoxContainer"]
-layout_mode = 2
-theme_override_font_sizes/font_size = 30
-text = "3"
-vertical_alignment = 1
 
 [connection signal="laser" from="Player" to="." method="_on_player_laser"]
 [connection signal="timeout" from="MeteorTimer" to="." method="_on_meteor_timer_timeout"]

meteor.gd

@@ -3,6 +3,8 @@ extends Area2D
 var velocity
 var angular_velocity
 
+signal collision
+
 func _ready() -> void:
 	var rng := RandomNumberGenerator.new()
 	var width = get_viewport().get_visible_rect().size[0]
@@ -28,4 +30,10 @@ func _process(delta):
 	rotation += angular_velocity * delta
 
 func _on_body_entered(body:Node2D) -> void:
-	pass # Replace with function body.
+	collision.emit()
+
+
+func _on_area_entered(area: Area2D) -> void:
+	Global.score += 150
+	area.queue_free()
+	queue_free()

meteor.tscn

@@ -4,6 +4,8 @@
 [ext_resource type="Texture2D" uid="uid://baifmn2j7f820" path="res://assets/PNG/Meteors/meteorBrown_big1.png" id="1_m5pls"]
 
 [node name="Meteor" type="Area2D"]
+collision_layer = 0
+collision_mask = 2
 script = ExtResource("1_hsdcx")
 
 [node name="Sprite" type="Sprite2D" parent="."]
@@ -12,4 +14,5 @@ texture = ExtResource("1_m5pls")
 [node name="CollisionPolygon2D" type="CollisionPolygon2D" parent="."]
 polygon = PackedVector2Array(-33, -40, 23, -40, 48, -1, 34, 31, 10, 29, -23, 40, -50, 10)
 
+[connection signal="area_entered" from="." to="." method="_on_area_entered"]
 [connection signal="body_entered" from="." to="." method="_on_body_entered"]

player.tscn

@@ -4,6 +4,7 @@
 [ext_resource type="Script" path="res://player.gd" id="1_lh8st"]
 
 [node name="Player" type="CharacterBody2D"]
+collision_layer = 2
 script = ExtResource("1_lh8st")
 
 [node name="PlayerImage" type="Sprite2D" parent="."]

project.godot

@@ -14,12 +14,20 @@ config/name="Space Shooter"
 run/main_scene="res://level.tscn"
 config/features=PackedStringArray("4.3", "Forward Plus")
 
+[autoload]
+
+Global="*res://global.gd"
+
 [display]
 
 window/size/viewport_width=1920
 window/size/viewport_height=1080
 window/size/mode=3
 
+[global_group]
+
+ui=""
+
 [input]
 
 left={

ui.gd

@@ -0,0 +1,10 @@
+extends CanvasLayer
+
+func set_health(health):
+  print(health)
+  $HealthMarginContainer/HealthBox/HealthLabel.text = str(health)
+
+
+func _on_score_timer_timeout() -> void:
+  Global.score += 100
+  $ScoreMarginContainer/ScoreLabel.text = str(Global.score)

ui.tscn

@@ -0,0 +1,49 @@
+[gd_scene load_steps=3 format=3 uid="uid://d2kq441mv37fr"]
+
+[ext_resource type="Texture2D" uid="uid://mw23y37wfrjm" path="res://assets/PNG/UI/playerLife1_blue.png" id="1_6jkth"]
+[ext_resource type="Script" path="res://ui.gd" id="1_vrtns"]
+
+[node name="UI" type="CanvasLayer" groups=["ui"]]
+script = ExtResource("1_vrtns")
+
+[node name="ScoreMarginContainer" type="MarginContainer" parent="."]
+anchors_preset = 5
+anchor_left = 0.5
+anchor_right = 0.5
+offset_left = -20.0
+offset_right = 20.0
+offset_bottom = 85.0
+grow_horizontal = 2
+theme_override_constants/margin_top = 16
+
+[node name="ScoreLabel" type="Label" parent="ScoreMarginContainer"]
+layout_mode = 2
+theme_override_font_sizes/font_size = 50
+text = "0"
+horizontal_alignment = 1
+
+[node name="HealthMarginContainer" type="MarginContainer" parent="."]
+offset_right = 40.0
+offset_bottom = 40.0
+theme_override_constants/margin_left = 16
+theme_override_constants/margin_top = 16
+
+[node name="HealthBox" type="HBoxContainer" parent="HealthMarginContainer"]
+layout_mode = 2
+theme_override_constants/separation = 12
+
+[node name="HealthSymbol" type="TextureRect" parent="HealthMarginContainer/HealthBox"]
+layout_mode = 2
+texture = ExtResource("1_6jkth")
+stretch_mode = 3
+
+[node name="HealthLabel" type="Label" parent="HealthMarginContainer/HealthBox"]
+layout_mode = 2
+theme_override_font_sizes/font_size = 30
+text = "3"
+vertical_alignment = 1
+
+[node name="ScoreTimer" type="Timer" parent="."]
+autostart = true
+
+[connection signal="timeout" from="ScoreTimer" to="." method="_on_score_timer_timeout"]