90 lines
2.7 KiB
GDScript
90 lines
2.7 KiB
GDScript
extends "res://objects/enemy/enemy.gd"
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# distance between segments
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const SEGMENT_LENGTH: float = 4.0
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# number of segments
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export var segments: int = 8
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# speed eel travels
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export var speed: float = 32.0
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# how far eel travels along path for complete wave
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export var wave_length: float = 0.0
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# intensity in pixels of eel wave animation
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export var wave_amplitude: float = 0.0
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var _segments: Array
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onready var head: PathFollow2D = $Head
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onready var tail: PathFollow2D = $Tail
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func _ready() -> void:
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# get nodes
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var first_segment: PathFollow2D = $Segment
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var first_segment_shape: CollisionShape2D = $"%SegmentShape"
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# initialize segments array
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_segments = []
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_segments.resize(segments)
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# loop for number of segments needed
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for i in segments:
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# create and add new segment instance
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var new_segment = first_segment.duplicate()
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add_child(new_segment)
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_segments[i] = new_segment
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# add new shape to hitbox
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var new_segment_shape = first_segment_shape.duplicate()
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$Hitbox.add_child(new_segment_shape)
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# link segment's remote transform to its collision shape
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var new_shape_transform = new_segment.get_node("ShapeTransform")
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new_shape_transform.remote_path = new_shape_transform.get_path_to(new_segment_shape)
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# free template segment
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first_segment.queue_free()
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first_segment_shape.queue_free()
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func _physics_process(delta: float) -> void:
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# move along path
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head.offset += speed * delta
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# position segments accordingly
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_offset_segments()
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# waving animation
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_wave_segments()
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func _offset_segments() -> void:
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# put tail at end
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tail.offset = head.offset - SEGMENT_LENGTH * float(segments + 1)
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# loop through segments
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for i in _segments.size():
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# set segment position based on index and length
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_segments[i].offset = head.offset - SEGMENT_LENGTH * float(i + 1)
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func _wave_segments() -> void:
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# save the effort of looping if nothing will come of it
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if wave_length == 0.0 and wave_amplitude == 0.0:
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return
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for child in get_children():
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# only affect childent that are pathfollows
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var segment = child as PathFollow2D
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if segment:
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# multiply by tau to use pixels as unit
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segment.v_offset = sin(segment.offset * TAU / wave_length) * wave_amplitude
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func die() -> void:
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# instance death particles for every segment
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for segment in _segments:
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# instance particles for this segment
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var death_particles = DeathParticles.instance()
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# TODO: something is wrong here, particles to not show up in correct position
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death_particles.global_transform = segment.global_transform
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# tone them down a little per-segment
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death_particles.amount /= 4
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death_particles.initial_velocity /= 2.0
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# emit
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death_particles.emitting = true
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# detach from self
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get_parent().add_child(death_particles)
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.die()
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