Implement very basic Enemy Waves

This has a lot of flaws which need to be fixed or changed, but the basic thing works.

entities/ui/game_ui.tscn

@@ -1,10 +1,11 @@
-[gd_scene load_steps=8 format=3 uid="uid://c5bpm1i4e17tu"]
+[gd_scene load_steps=9 format=3 uid="uid://c5bpm1i4e17tu"]
 
 [ext_resource type="Script" path="res://scripts/ui/towers_panel.gd" id="1_x58qh"]
 [ext_resource type="PackedScene" uid="uid://cxhkiae15b8lv" path="res://entities/tower/speed_tower.tscn" id="2_cya8s"]
 [ext_resource type="PackedScene" uid="uid://deuhw3whq8lk5" path="res://entities/ui/tower_button.tscn" id="2_h3r6b"]
 [ext_resource type="Script" path="res://scripts/ui/healthui.gd" id="2_y5457"]
 [ext_resource type="PackedScene" uid="uid://c5ouqw68u8sy3" path="res://entities/ui/money_ui.tscn" id="3_15x11"]
+[ext_resource type="Script" path="res://entities/ui/waveui.gd" id="5_a80xb"]
 [ext_resource type="PackedScene" uid="uid://dofqeudsrivo2" path="res://entities/ui/game_speed.tscn" id="6_mepws"]
 
 [sub_resource type="SystemFont" id="SystemFont_lad62"]
@@ -43,6 +44,16 @@ theme_override_font_sizes/font_size = 28
 text = "100 ❤️"
 script = ExtResource("2_y5457")
 
+[node name="Wave" type="Label" parent="."]
+offset_left = 10.0
+offset_top = 50.0
+offset_right = 184.0
+offset_bottom = 98.0
+theme_override_fonts/font = SubResource("SystemFont_lad62")
+theme_override_font_sizes/font_size = 28
+text = "Wave: "
+script = ExtResource("5_a80xb")
+
 [node name="Money" parent="." instance=ExtResource("3_15x11")]
 offset_left = 831.0
 offset_top = 913.0

entities/ui/waveui.gd

@@ -0,0 +1,7 @@
+extends Label
+
+func _ready():
+	helper.get_game().connect("wave_update", _on_wave_update)
+
+func _on_wave_update(amount) -> void:
+	text = "Wave: " + str(amount)

main.gd

@@ -2,13 +2,17 @@ extends Node2D
 
 var health: int = 100
 var money: int = 100
+var difficulty: int = 5
+var wave: int = 0
+var enemyList: Array
 
 var b_in_ui = false
 @onready var enemy = preload("res://entities/enemy.tscn")
 @onready var spawners: Array = get_tree().get_nodes_in_group("spawn_location")
 
 signal player_health_update
 signal player_money_update
+signal wave_update
 
 func set_game_speed(speed):
 	Engine.time_scale = speed
@@ -21,13 +25,9 @@ func _ready():
 	eventmanager.connect("on_buy_tower", _on_buy_tower)
 	eventmanager.connect("on_player_hover_ui", on_player_hover_ui)
 	eventmanager.connect("on_toggle_game_speed", _on_toggle_game_speed)
+	eventmanager.connect("on_enemy_killed", onEnemyKilled)
 
 	emit_signal("player_money_update", money)
-	for spawner in spawners:
-		var new_enemy = enemy.instantiate()
-		new_enemy.speed = randf_range(60.0, 120.0)
-		new_enemy.set_progress(randf_range(0.0, 20.0)) # avoid enemies spawning exactly on top of each other
-		spawner.add_child(new_enemy)
 
 func _on_buy_tower(price) -> void:
 	money -= price
@@ -37,11 +37,19 @@ func on_player_hover_ui(b_is_in_ui) -> void:
 	b_in_ui = b_is_in_ui
 
 func _on_timer_timeout():
-	for spawner in spawners:
-		var new_enemy = enemy.instantiate()
-		new_enemy.speed = randf_range(40.0, 120.0)
-		new_enemy.set_progress(randf_range(0.0, 20.0))
-		spawner.add_child(new_enemy)
+	# TODO: Different Enemy Types | ex. Instead of Spawning 5 Enemies, spawn a more difficult one
+	# TODO: (may be fixed with the todo above): When large amounts of enemies need to be spawned, the spawning lags the game
+	if enemyList == []:
+		wave += 1
+		emit_signal("wave_update", wave)
+		for i in difficulty:
+			var spawner = spawners[randi_range(0, spawners.size()-1)]
+			var new_enemy = enemy.instantiate()
+			new_enemy.speed = randf_range(40.0, 120.0)
+			spawner.add_child(new_enemy)
+			enemyList.append(new_enemy)
+		difficulty = difficulty + ceil(wave * 1.2)
+		print("Difficulty: " + str(difficulty))
 
 func get_health() -> int:
 	return health
@@ -56,6 +64,12 @@ func _on_damage_player(value) -> void:
 	health -= value
 	emit_signal("player_health_update")
 
+func onEnemyKilled(enemy) -> void:
+	enemyList.erase(enemy)
+	money += 1
+	emit_signal("player_money_update", money)
+	# TODO: Dont add money when the enemy gets destroyed due to finishing the path
+
 func _on_toggle_game_speed(b_sped_up):
 	if b_sped_up:
 		set_game_speed(3)

scripts/autoload/eventmanager.gd

@@ -5,6 +5,7 @@ signal tower_button_pressed(towerButton)
 signal on_buy_tower(price)
 signal on_player_hover_ui(b_is_hovered)
 signal on_toggle_game_speed(bSpedUp)
+signal on_enemy_killed(enemy)
 
 func broadcast_player_take_damage(amount):
 	emit_signal("on_player_take_damage", amount)
@@ -22,3 +23,6 @@ func broadcast_hover_ui(b_is_hovered):
 
 func broadcast_toggle_game_speed(b_sped_up):
 	emit_signal("on_toggle_game_speed", b_sped_up)
+
+func broadcast_on_enemy_killed(enemy):
+	emit_signal("on_enemy_killed", enemy)

scripts/enemy.gd

@@ -8,7 +8,7 @@ var health = 2
 var damage = 5
 
 func _ready():
-	progress = 0
+	progress = randf_range(0.0, 40.0) # avoid enemies spawning exactly on top of each other
 
 func _process(delta):
 	sprite_reference.material.set_shader_parameter("progress", get_hit_timer_progress())
@@ -21,6 +21,7 @@ func _physics_process(delta):
 		progress += speed * delta
 	else:
 		eventmanager.broadcast_player_take_damage(get_damage())
+		eventmanager.broadcast_on_enemy_killed(self) # broadcast enemy got killed
 		queue_free()
 
 func get_damage():
@@ -32,5 +33,5 @@ func _on_area_2d_area_entered(area):
 		health -= area.get_damage()
 		area.queue_free() # destroy the projectile
 		if health == 0:
+			eventmanager.broadcast_on_enemy_killed(self) # broadcast enemy got killed
 			queue_free() # "kill" the enemy
-			print("Enemy died")