58 lines
1.5 KiB
GDScript3
58 lines
1.5 KiB
GDScript3
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class_name ExplosionVFXBase
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extends Node2D
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# Shared particle motion/fade/lifetime logic for all explosion VFX types.
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# Subclasses fix their own visual style and color as facts about
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# themselves (see LightBurstVFX/AsteroidExplosionVFX), not as parameters
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# passed in by whatever destroyed the object - so "ships always explode
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# blue" is guaranteed by the class hierarchy, not by remembering to pass
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# the right Color() at each call site.
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@export var particle_count: int = 12
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@export var lifetime: float = 0.5
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@export var min_speed: float = 60.0
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@export var max_speed: float = 220.0
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var age: float = 0.0
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var particles: Array = []
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func _ready() -> void:
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randomize()
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for i in range(particle_count):
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var angle: float = randf() * TAU
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var speed: float = randf_range(min_speed, max_speed)
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particles.append({
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"pos": Vector2.ZERO,
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"vel": Vector2(cos(angle), sin(angle)) * speed,
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"rot": randf() * TAU,
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"rot_speed": randf_range(-6.0, 6.0),
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"size": _random_particle_size(),
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})
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queue_redraw()
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func _process(delta: float) -> void:
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age += delta
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if age >= lifetime:
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queue_free()
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return
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for p in particles:
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p["pos"] += p["vel"] * delta
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p["vel"] *= 0.9
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p["rot"] += p["rot_speed"] * delta
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queue_redraw()
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func _draw() -> void:
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var alpha: float = clamp(1.0 - (age / lifetime), 0.0, 1.0)
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for p in particles:
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_draw_particle(p, alpha)
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func _random_particle_size() -> float:
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return randf_range(10.0, 20.0)
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func _draw_particle(_p: Dictionary, _alpha: float) -> void:
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pass
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