133 lines
4.3 KiB
GDScript
133 lines
4.3 KiB
GDScript
class_name AttackBuffVisual
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extends Node2D
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const DEFAULT_FRAME_DIRECTORY := "res://assets/ui/buff_effect"
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const DEFAULT_MAX_STACKS := 7
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@export var frame_directory := DEFAULT_FRAME_DIRECTORY
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@export var frames_per_second := 18.0
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@export var center_offset := Vector2(0.0, -86.0)
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@export var minimum_scale := 0.85
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@export var maximum_scale := 1.85
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@export var minimum_alpha := 0.28
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@export var maximum_alpha := 0.95
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var _stacks := 0
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var _max_stacks := DEFAULT_MAX_STACKS
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var _frame_index := 0
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var _frame_elapsed := 0.0
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var _pulse_elapsed := 0.0
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var _frames: Array[Texture2D] = []
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var _sprite: Sprite2D
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func _ready() -> void:
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z_index = 1
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_sprite = Sprite2D.new()
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_sprite.name = "BuffEffect"
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_sprite.centered = true
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_sprite.position = center_offset
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_sprite.texture_filter = CanvasItem.TEXTURE_FILTER_NEAREST
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_sprite.visible = false
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add_child(_sprite)
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_load_frames()
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_connect_event_buses()
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call_deferred("_connect_event_buses")
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call_deferred("_sync_from_attack_buff_component")
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set_attack_buff(0, DEFAULT_MAX_STACKS)
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func _process(delta: float) -> void:
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if _stacks <= 0 or _frames.is_empty():
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return
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var intensity := _intensity()
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_pulse_elapsed = fmod(_pulse_elapsed + delta * lerpf(1.3, 2.8, intensity), TAU)
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_frame_elapsed += delta
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var frame_duration := 1.0 / maxf(1.0, frames_per_second * lerpf(0.85, 1.35, intensity))
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while _frame_elapsed >= frame_duration:
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_frame_elapsed -= frame_duration
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_frame_index = (_frame_index + 1) % _frames.size()
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_sprite.texture = _frames[_frame_index]
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_apply_effect_state()
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func set_attack_buff(stacks: int, max_stacks: int) -> void:
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_max_stacks = maxi(1, max_stacks)
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_stacks = clampi(stacks, 0, _max_stacks)
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set_process(_stacks > 0 and not _frames.is_empty())
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visible = _stacks > 0 and not _frames.is_empty()
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if _sprite != null:
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_sprite.visible = visible
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if visible and _sprite.texture == null and not _frames.is_empty():
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_sprite.texture = _frames[_frame_index]
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_apply_effect_state()
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func frame_count() -> int:
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return _frames.size()
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func _on_attack_buff_changed(stacks: int, max_stacks: int) -> void:
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set_attack_buff(stacks, max_stacks)
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func _load_frames() -> void:
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_frames.clear()
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var dir := DirAccess.open(frame_directory)
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if dir == null:
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return
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# 导出包内贴图在目录列表里显示为 xxx.png.import / xxx.png.remap；
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# 还原原名后 load() 才能命中。编辑器里原图与 .import 同时在列，需去重。
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var files := PackedStringArray()
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dir.list_dir_begin()
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var file_name := dir.get_next()
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while not file_name.is_empty():
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if not dir.current_is_dir():
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var resource_name := file_name.trim_suffix(".import").trim_suffix(".remap")
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if resource_name.begins_with("frame") and resource_name.ends_with(".png") and not files.has(resource_name):
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files.append(resource_name)
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file_name = dir.get_next()
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dir.list_dir_end()
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files.sort()
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for path_name: String in files:
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var texture := load("%s/%s" % [frame_directory, path_name]) as Texture2D
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if texture != null:
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_frames.append(texture)
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if not _frames.is_empty() and _sprite != null:
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_sprite.texture = _frames[0]
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func _apply_effect_state() -> void:
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if _sprite == null:
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return
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if _stacks <= 0 or _frames.is_empty():
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_sprite.visible = false
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return
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var intensity := _intensity()
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var pulse := 0.5 + 0.5 * sin(_pulse_elapsed)
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_sprite.position = center_offset
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_sprite.scale = Vector2.ONE * (lerpf(minimum_scale, maximum_scale, intensity) + pulse * lerpf(0.03, 0.18, intensity))
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_sprite.modulate = Color(1.0, 1.0, 1.0, lerpf(minimum_alpha, maximum_alpha, intensity) * lerpf(0.78, 1.0, pulse))
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_sprite.visible = true
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func _sync_from_attack_buff_component() -> void:
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var actor := get_parent()
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if actor != null:
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actor = actor.get_parent()
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var component := actor.get_node_or_null("AttackBuffComponent") if actor != null else null
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if component != null and component.has_method("attack_buff_stacks"):
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set_attack_buff(int(component.call("attack_buff_stacks")), DEFAULT_MAX_STACKS)
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func _connect_event_buses() -> void:
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if not is_inside_tree():
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return
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for child: Node in get_tree().root.get_children():
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if child.has_signal("attack_buff_changed") and not child.is_connected("attack_buff_changed", _on_attack_buff_changed):
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child.connect("attack_buff_changed", _on_attack_buff_changed)
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func _intensity() -> float:
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return clampf(float(_stacks) / float(maxi(1, _max_stacks)), 0.0, 1.0)
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