position-based turtle spiking (closes #135)

objects/enemy/turtle.gd

@@ -1,37 +1,107 @@
 tool
 extends "res://objects/enemy/enemy_move_sidesideupdown.gd"
 
-export var spike_delay: float = 2.0
+## positions along the path where spikes will trigger
+export (Array, float) var spike_positions: Array = []
+## time spikes stay active
 export var spike_time: float = 0.25
 
+# animates the spikes
+var can_spike: bool = true
 var spike_tween: SceneTreeTween
 
+# index of the current spike position to check for
+onready var current_spike_position: int = 0
 onready var sprite: Sprite = $"%Sprite"
 onready var spike_shape: CollisionShape2D = $"%SpikeShape"
 
 func _ready() -> void:
+	# don't act in the editor
 	if Engine.editor_hint:
 		return
-	spike_tween = create_tween().set_loops()
+	
+	# positions must be in order
+	spike_positions.sort()
+	for i in spike_positions.size():
+		# scale to be in tiles
+		spike_positions[i] = spike_positions[i] * 8.0
+		# should start with the first positive spike position
+		if spike_positions[i] < 0.0:
+			current_spike_position = i + 1
+
+func _process(delta: float) -> void:
+	# update debug graphics in editor
+	if Engine.editor_hint and Engine.get_frames_drawn() % 10 == 0:
+		update()
+
+func _physics_process(delta: float) -> void:
+	# do nothing in editor
+	if Engine.editor_hint:
+		return
+	
+	# sync hitbox
+	$HeadHitbox.scale.x = $ToFlip.scale.x
+	
+	# check if can still spike before doing all this work
+	if not can_spike:
+		return
+	# use positions in correct axis
+	var pos = position.x if move_direction == Direction.HORIZONTAL else position.y
+	var pos_start = startpos.x if move_direction == Direction.HORIZONTAL else startpos.y
+	# slightly different logic depending on forward/backwards unfortunately :I
+	match sign(direction):
+		1.0:
+			# make sure there are any positions left to check in this direction
+			if current_spike_position < spike_positions.size():
+				# check if passed the spike position
+				if pos >= pos_start + spike_positions[current_spike_position]:
+					# move on to next position
+					current_spike_position += 1
+					spike()
+		-1.0:
+			# make sure there are still positions left in this direction
+			if current_spike_position - 1 >= 0:
+				# check if passed the position
+				if pos <= pos_start + spike_positions[current_spike_position - 1]:
+					# move on to next (previous because backwards) position
+					current_spike_position -= 1
+					spike()
+
+## performs the spike animation
+func spike() -> void:
+	# reset tween
+	if spike_tween != null:
+		spike_tween.kill() # never have two tweens acting on the same thing
+	spike_tween = create_tween()
 	spike_tween.set_process_mode(Tween.TWEEN_PROCESS_PHYSICS)
-	
-	spike_tween.tween_property(spike_shape, "disabled", true, 0.0)
-	spike_tween.tween_property(sprite, "frame_coords:y", 0.0, 0.0)
-	spike_tween.tween_interval(spike_delay)
-	
+	# indicator sprite
 	spike_tween.tween_property(sprite, "frame_coords:y", 1.0, 0.0)
 	spike_tween.tween_interval(spike_time * 2.0)
-	
+	# spikes active
 	spike_tween.tween_property(spike_shape, "disabled", false, 0.0)
 	spike_tween.tween_property(sprite, "frame_coords:y", 2.0, 0.0)
 	spike_tween.tween_interval(spike_time)
-
-func _physics_process(delta: float) -> void:
-	$HeadHitbox.scale.x = $ToFlip.scale.x
+	# spikes gone once more
+	spike_tween.tween_property(spike_shape, "disabled", true, 0.0)
+	spike_tween.tween_property(sprite, "frame_coords:y", 0.0, 0.0)
 
 func die() -> void:
+	# disable spiking
+	can_spike = false
+	# stop tween
 	spike_tween.kill()
+	# disable hitbox
 	spike_shape.set_deferred("disabled", true)
+	# reset animation
 	sprite.frame_coords.y = 3
 	Audio.play_sound(death_sound, Audio.ac_die)
 	$"%DeathSplatter".emitting = true
+
+func _draw() -> void:
+	if Engine.editor_hint:
+		# still draw base moving enemy debug lines
+		._draw()
+		# draw dots at spike positions
+		for pos in spike_positions:
+			var dir = Vector2.RIGHT if move_direction == Direction.HORIZONTAL else Vector2.DOWN
+			draw_circle(dir * pos * 8.0, 2.0, Color.red)

objects/enemy/turtle.tscn

@@ -68,7 +68,6 @@ texture = ExtResource( 1 )
 centered = false
 hframes = 3
 vframes = 4
-frame = 6
 
 [node name="SwimPlayer" type="AnimationPlayer" parent="ToFlip"]
 root_node = NodePath("../..")
@@ -92,6 +91,7 @@ unique_name_in_owner = true
 unique_name_in_owner = true
 position = Vector2( 8.5, -1.5 )
 shape = SubResource( 5 )
+disabled = true
 
 [node name="Platform" type="KinematicBody2D" parent="SpikeHitbox"]