spider implementation! death_blood_offset variable added to enemy.gd to facilitate

objects/enemy/spider.gd

@@ -0,0 +1,34 @@
+extends "res://objects/enemy/enemy.gd"
+
+export var speed = 0.0
+export var direction = 1.0
+
+onready var line = $Line2D
+onready var hitbox = $Hitbox
+
+var floor_y = 0.0
+
+func _ready():
+	var raycast = $RayCast2D
+	# detect ceiling
+	raycast.force_raycast_update()
+	var old_y = hitbox.global_position.y
+	global_position.y = raycast.get_collision_point().y
+	hitbox.global_position.y = old_y
+	line.points[1].y = hitbox.position.y
+	# detect floor
+	raycast.cast_to = Vector2(0.0, 192.0)
+	raycast.force_raycast_update()
+	floor_y = to_local(raycast.get_collision_point()).y - 3
+	raycast.queue_free()
+
+func _physics_process(delta):
+	hitbox.position.y += direction * speed * delta
+	if hitbox.position.y < 5.0:
+		hitbox.position.y = 5.0
+		direction = 1.0
+	if hitbox.position.y > floor_y:
+		hitbox.position.y = floor_y
+		direction = -1.0
+	line.points[1].y = hitbox.position.y
+	death_blood_offset = hitbox.position