110 lines
3.8 KiB
GDScript
110 lines
3.8 KiB
GDScript
class_name GasBombEffect
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extends Node2D
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# The gas bomb itself: the flight, the blast and the picture of both, with
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# nothing in it about who threw it.
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#
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# Lifted out of GasBombController for the same reason LaserBeamEffect was
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# lifted out of LaserController - the shot was something only the FLEET could
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# do, and a garrisoned bomber needs the same shot from a different trigger
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# and a different magazine. Added to the tree root, self-animating,
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# self-freeing, and it outlives the vessel that threw it.
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signal struck(hit_count: int)
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const BOMB_COLOR := Color(0.96, 0.22, 0.72)
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const AOE_RADIUS := 180.0
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const PROJECTILE_SPEED := 720.0
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const EXPLOSION_DURATION := 0.8
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var target: Vector2 = Vector2.ZERO
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var damage: int = 3
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var trail: PackedVector2Array = PackedVector2Array()
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var exploded: bool = false
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var explosion_time: float = 0.0
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var hit_count: int = 0
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static func launch(world: Node, origin: Vector2, at: Vector2,
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blast_damage: int = 3) -> GasBombEffect:
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var effect := GasBombEffect.new()
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effect.position = origin
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effect.target = at
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effect.damage = blast_damage
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effect.trail = PackedVector2Array([origin])
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world.add_child(effect)
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return effect
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func in_flight() -> bool:
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return not exploded
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func _process(delta: float) -> void:
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if not exploded:
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_advance_flight(delta)
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queue_redraw()
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return
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explosion_time = maxf(explosion_time - delta, 0.0)
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queue_redraw()
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if explosion_time <= 0.0:
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queue_free()
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func _advance_flight(delta: float) -> void:
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var distance: float = position.distance_to(target)
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if distance <= PROJECTILE_SPEED * delta:
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position = target
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_explode()
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return
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position = position.move_toward(target, PROJECTILE_SPEED * delta)
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trail.append(position)
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while trail.size() > 12:
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trail.remove_at(0)
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func _explode() -> void:
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exploded = true
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explosion_time = EXPLOSION_DURATION
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hit_count = 0
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# Asteroids too - a blast that clears everything around it but leaves the
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# rocks untouched would need explaining, and they take damage the same way.
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#
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# #176: player weapons never damage player buildings. A bomb may be thrown
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# into a siege without punishing the structure it is meant to defend.
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for target_node in get_tree().get_nodes_in_group("enemies") \
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+ get_tree().get_nodes_in_group("asteroids"):
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if is_instance_valid(target_node) and target_node is Node2D \
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and target_node.global_position.distance_to(target) <= AOE_RADIUS:
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target_node.take_damage(damage)
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hit_count += 1
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struck.emit(hit_count)
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func _draw() -> void:
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# Drawn in this node's own space while it flies (it moves), and around the
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# blast point once it lands (it does not).
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if not exploded:
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if trail.size() >= 2:
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for i in range(1, trail.size()):
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var alpha: float = float(i) / trail.size()
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draw_line(trail[i - 1] - position, trail[i] - position,
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Color(BOMB_COLOR, alpha * 0.65), 4.0 + alpha * 4.0, true)
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draw_circle(Vector2.ZERO, 12.0, Color(BOMB_COLOR, 0.35))
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NeonDraw.draw_glowing_circle(self, Vector2.ZERO, 7.0, BOMB_COLOR, 1.0)
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return
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var progress: float = 1.0 - explosion_time / EXPLOSION_DURATION
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var radius: float = lerpf(24.0, AOE_RADIUS, minf(progress * 1.5, 1.0))
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draw_circle(Vector2.ZERO, radius, Color(BOMB_COLOR, (1.0 - progress) * 0.16))
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draw_ring(Vector2.ZERO, radius, BOMB_COLOR, 1.0 - progress)
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for i in range(7):
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var angle: float = TAU * float(i) / 7.0 + progress
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var cloud_at: Vector2 = Vector2(cos(angle), sin(angle)) * radius * 0.55
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draw_circle(cloud_at, 18.0 + 14.0 * progress,
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Color(BOMB_COLOR, (1.0 - progress) * 0.22))
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func draw_ring(center: Vector2, radius: float, color: Color, alpha: float) -> void:
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draw_arc(center, radius, 0.0, TAU, 64, Color(color, 0.16 * alpha), 16.0, true)
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draw_arc(center, radius, 0.0, TAU, 64, Color(color, 0.5 * alpha), 6.0, true)
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draw_arc(center, radius, 0.0, TAU, 64, Color(1.0, 0.86, 0.96, 0.9 * alpha), 2.0, true)
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