47 lines
1.2 KiB
GDScript3
47 lines
1.2 KiB
GDScript3
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extends CanvasLayer
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@export var target: Node2D
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@onready var rect = $ColorRect
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var mat: ShaderMaterial
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var last_pos: Vector2
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func _ready():
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mat = rect.material as ShaderMaterial
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if target != null:
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last_pos = target.global_position
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func _process(delta: float) -> void:
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if target == null:
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return
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if mat == null:
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return
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var vp_size: Vector2 = get_viewport().get_visible_rect().size
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# 玩家世界坐标
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var world_pos: Vector2 = target.global_position
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# ✅ 世界 -> 屏幕像素坐标（包含相机影响）
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var screen_pos: Vector2 = get_viewport().get_canvas_transform() * world_pos
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# 速度方向（世界空间）
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var vel: Vector2 = (world_pos - last_pos) / max(delta, 0.0001)
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last_pos = world_pos
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var speed: float = vel.length()
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var dir: Vector2 = Vector2.RIGHT
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if speed > 0.001:
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dir = vel / speed
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# ✅ 船头前移（拨水发生在玩家前面）
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var front_offset_px: Vector2 = dir * 30.0
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var uv_front: Vector2 = (screen_pos + front_offset_px) / vp_size
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uv_front = uv_front.clamp(Vector2(0, 0), Vector2(1, 1))
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mat.set_shader_parameter("obj_uv", uv_front)
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mat.set_shader_parameter("obj_dir", dir)
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mat.set_shader_parameter("obj_speed", clamp(speed / 600.0, 0.0, 2.0))
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