104 lines
3.3 KiB
GDScript
104 lines
3.3 KiB
GDScript
extends Sprite2D
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#昼夜循环只需调节该节点的modulate值即可
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# 存储背景图片的路径数组
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var backgrounds :Array = [
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"res://assets/背景图片/背景1.webp",
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"res://assets/背景图片/背景2.webp",
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"res://assets/背景图片/背景3.webp",
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"res://assets/背景图片/背景4.webp",
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"res://assets/背景图片/背景5.webp",
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"res://assets/背景图片/背景6.webp",
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"res://assets/背景图片/背景7.webp",
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"res://assets/背景图片/背景8.webp",
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"res://assets/背景图片/背景9.webp",
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"res://assets/背景图片/背景10.webp"
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]
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# 当前显示的背景索引
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var current_index = -1
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# 过渡动画的持续时间（秒）
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@export var transition_duration: float = 1.5
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# 节点引用
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@onready var background2: Sprite2D = $Background2
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@onready var timer: Timer = $Timer
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# 用于持有当前正在运行的Tween的引用，方便在需要时中止它
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var current_tween: Tween
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func _ready():
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# 验证背景图片资源
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if not validate_backgrounds():
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return
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# 初始化，直接设置第一张背景，不进行过渡
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current_index = randi() % backgrounds.size()
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self.texture = load(backgrounds[current_index])
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# 设置第二个Sprite的初始状态为完全透明
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background2.modulate.a = 0.0
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# 配置计时器
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timer.wait_time = 10.0
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timer.timeout.connect(switch_background) # 直接连接切换函数
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timer.start()
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func validate_backgrounds() -> bool:
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var valid_backgrounds = []
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for bg_path in backgrounds:
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if ResourceLoader.exists(bg_path):
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valid_backgrounds.append(bg_path)
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else:
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push_error("背景图片不存在: " + bg_path)
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backgrounds = valid_backgrounds
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if backgrounds.is_empty():
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push_error("没有可用的背景图片！")
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return false
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return true
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func switch_background():
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if backgrounds.size() <= 1:
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return
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# 1. 选择一张新的、不重复的背景图
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var new_index = randi() % backgrounds.size()
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while new_index == current_index:
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new_index = randi() % backgrounds.size()
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current_index = new_index
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var new_texture = load(backgrounds[current_index])
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if new_texture == null:
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push_error("无法加载背景图片: " + backgrounds[current_index])
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return
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# 2. 将新图片设置到上层的Sprite2D (background2)
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background2.texture = new_texture
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# 3. 【核心改动】创建并执行Tween动画
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# 如果上一个动画还在运行，先中止它，防止动画重叠或冲突
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if current_tween and current_tween.is_valid():
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current_tween.kill()
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# 直接从节点创建 Tween 对象，无需场景树中有Tween节点
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current_tween = create_tween()
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# 设置动画：让 background2 的 modulate.a (透明度) 从 0 (透明) 渐变到 1 (不透明)
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current_tween.tween_property(background2, "modulate:a", 1.0, transition_duration)\
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.set_ease(Tween.EASE_IN_OUT).set_trans(Tween.TRANS_SINE)
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# 4. 动画完成后，通过 .connect() 连接一个回调函数进行状态重置
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current_tween.finished.connect(_on_transition_finished)
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# 注意：之前的 _on_timer_timeout 函数的功能已合并到 switch_background
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# 所以我们只需要一个动画完成后的回调函数
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func _on_transition_finished():
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# 动画结束后，将新背景 "固化" 到主背景上
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self.texture = background2.texture
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# 并将上层背景重置为透明，为下一次过渡做准备
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background2.modulate.a = 0.0
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# 清除引用，虽然不必须，但是个好习惯
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current_tween = null
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