67 lines
2.2 KiB
GDScript3
67 lines
2.2 KiB
GDScript3
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extends Node2D
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# Forgejo #87: a brief spray of sparks off the hull that just fired.
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#
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# Firing was silent at the ship's end - a bolt simply appeared in front of it.
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# With a whole fleet shooting there was nothing tying a shot to the vessel it
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# came from, which mattered more once the player started aiming: you could not
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# see which of your ships were actually in the fight.
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#
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# Deliberately tiny and short. This fires several times a second per vessel,
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# so it has to be legible at a glance and gone before the next one - anything
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# with weight would turn a firing fleet into a smear.
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#
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# No class_name, and it loads itself by path: a global class-name identifier
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# is not reliably resolvable from a script reached through a preload chain,
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# which is what happens here. Same reason as ResourcePickupVFX.
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const SELF_PATH: String = "res://vfx/MuzzleSparkVFX.gd"
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const SPARK_COUNT: int = 4
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const DURATION: float = 0.13
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const SPREAD: float = 0.5
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const LENGTH: float = 9.0
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const COLOR: Color = Color(1.0, 0.88, 0.42)
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var age: float = 0.0
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var sparks: Array = []
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static func spawn(parent: Node, world_position: Vector2, direction: Vector2) -> void:
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if direction.length() < 0.001:
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return
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var vfx: Node2D = (load(SELF_PATH) as GDScript).new()
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vfx.position = world_position
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vfx.rotation = direction.angle()
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parent.add_child(vfx)
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func _ready() -> void:
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# Built once here rather than per frame: the streaks never change shape,
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# only how far along their own line they have travelled, so _draw reads
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# fixed values. Same discipline as the explosion particles.
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for i in range(SPARK_COUNT):
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sparks.append({
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"angle": randf_range(-SPREAD, SPREAD),
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"speed": randf_range(190.0, 340.0),
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"length": randf_range(LENGTH * 0.6, LENGTH),
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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 >= DURATION:
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queue_free()
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return
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queue_redraw()
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func _draw() -> void:
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var t: float = clampf(age / DURATION, 0.0, 1.0)
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var fade: float = 1.0 - t
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for spark in sparks:
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var heading: Vector2 = Vector2.RIGHT.rotated(float(spark.angle))
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var start: Vector2 = heading * float(spark.speed) * age
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var end: Vector2 = start + heading * float(spark.length)
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NeonDraw.draw_glowing_line(self, start, end, COLOR, fade, 0.35,
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COLOR.darkened(0.7))
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