104 lines
2.8 KiB
GDScript
104 lines
2.8 KiB
GDScript
class_name EnemyManager
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extends Node2D
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@export var max_enemies: int
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@export var spawn_rate: float
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@export var target: CollisionObject2D
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@export var camera: Camera2D
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@onready var timer: Timer = $Timer
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const ENEMY_RAT = preload("res://scenes/enemies/enemy_rat.tscn")
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const ENEMY_BAT = preload("res://scenes/enemies/enemy_bat.tscn")
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const ENEMY_SLIME_SMALL = preload("res://scenes/enemies/enemy_slime_small.tscn")
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const SLIME_COLOR_VARIATIONS: Array[Color]= [ Color.CHARTREUSE, Color.FUCHSIA, Color.DARK_ORANGE ]
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func _ready() -> void:
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timer.wait_time = 1 / spawn_rate
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timer.start()
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GlobalConst.sig_stop_spawning.connect(_on_stop_spawning)
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GlobalConst.sig_set_spawn_rate.connect(_on_set_spawn_rate)
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func _on_timer_timeout() -> void:
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var enemies = get_tree().get_nodes_in_group(GlobalConst.GROUP_ENEMY)
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GlobalConst.sig_debug_stats_set.emit("enemy_count", "%s" % len(enemies))
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var next_enemy: PackedScene
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match randi() % 3:
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0:
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next_enemy = ENEMY_BAT
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1:
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next_enemy = ENEMY_RAT
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2:
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next_enemy = ENEMY_SLIME_SMALL
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if len(enemies) < max_enemies:
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var new_enemy = next_enemy.instantiate()
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new_enemy.position = _get_spawn_pos()
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new_enemy.target = target
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if is_instance_of(new_enemy, EnemySlimeSmall):
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var slime_color: Color = SLIME_COLOR_VARIATIONS.pick_random()
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new_enemy.color = slime_color
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add_child(new_enemy)
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func _get_spawn_pos() -> Vector2:
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var rect = _get_camera_rect()
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var side = randi() % 4
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var margin = 50
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var pos: Vector2
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match side:
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0: # Top
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pos = Vector2(
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randf_range(rect.position.x, rect.position.x + rect.size.x),
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rect.position.y - margin
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)
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1: # Bottom
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pos = Vector2(
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randf_range(rect.position.x, rect.position.x + rect.size.x),
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rect.position.y + rect.size.y + margin
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)
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2: # Left
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pos = Vector2(
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rect.position.x - margin,
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randf_range(rect.position.y, rect.position.y + rect.size.y)
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)
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3: # Right
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pos = Vector2(
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rect.position.x + rect.size.x + margin,
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randf_range(rect.position.y, rect.position.y + rect.size.y)
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)
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if !_is_pos_valid(pos):
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pos = _get_spawn_pos()
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return pos
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func _is_pos_valid(pos: Vector2) -> bool:
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var space = get_world_2d().direct_space_state
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var parameters = PhysicsPointQueryParameters2D.new()
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parameters.collide_with_areas = false
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parameters.collide_with_bodies = true
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parameters.collision_mask = 1
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parameters.position = pos
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var result = space.intersect_point(parameters, 1)
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return result.size() == 0
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func _get_camera_rect() -> Rect2:
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var viewport_size = camera.get_viewport_rect().size
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var half_size = viewport_size * 0.5
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var top_left = camera.global_position - half_size
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return Rect2(top_left, viewport_size)
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func _on_stop_spawning(val: bool):
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if val:
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timer.stop()
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elif timer.is_stopped():
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timer.start()
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func _on_set_spawn_rate(val: float):
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timer.wait_time = 1 / val
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