131 lines
4.5 KiB
GDScript
131 lines
4.5 KiB
GDScript
extends Control
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## 画脸面板：把 FaceRig 的笔画层显示出来，并把鼠标坐标换算成画布坐标喂给画笔。
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##
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## 面板自己不画任何东西 —— 笔画直接落在 FaceRig 的画笔上，所以关掉面板后角色脸上立刻就是刚画的。
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## 打开时拍一张快照，点「取消」还原；点「完成」才写进存档。
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signal finished
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signal cancelled
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## 画布在屏幕上的显示边长。真实画布是 rig.canvas_size 见方，坐标按比例换算
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const VIEW_SIZE := 420
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@onready var _canvas_rect: TextureRect = %StrokeRect
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@onready var _preset_rect: TextureRect = %PresetRect
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@onready var _color_button: ColorPickerButton = %ColorButton
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@onready var _width_slider: HSlider = %WidthSlider
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@onready var _width_label: Label = %WidthLabel
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@onready var _eraser_toggle: CheckButton = %EraserToggle
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var _rig: FaceRig
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## 打开面板时的笔画层快照，取消时还原
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var _snapshot: PackedByteArray
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## 打开面板时用的是哪张预设，取消时一并还原（「自己画」会把底图换成空白）
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var _preset_before: String = ""
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## 左键是不是按着 —— 拖拽判定用这个，不看 motion 事件里的 button_mask
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var _drawing := false
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func _ready() -> void:
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visible = false
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_canvas_rect.custom_minimum_size = Vector2(VIEW_SIZE, VIEW_SIZE)
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_canvas_rect.gui_input.connect(_on_canvas_input)
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_color_button.color_changed.connect(_on_color_changed)
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_width_slider.value_changed.connect(_on_width_changed)
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_eraser_toggle.toggled.connect(_on_eraser_toggled)
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%ClearButton.pressed.connect(_on_clear)
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%DoneButton.pressed.connect(_on_done)
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%CancelButton.pressed.connect(_on_cancel)
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_on_width_changed(_width_slider.value)
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# ---------------- 对外接口 ----------------
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## 打开面板并绑定到某个 FaceRig。
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## blank_face 传了就从这张空白脸起手（「自己画」用）—— 快照仍然记的是改动之前的状态，
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## 所以点「取消」能把底图和笔画一起还原。
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func open(rig: FaceRig, blank_face: Texture2D = null) -> void:
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if rig == null or rig.painter == null:
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push_warning("画脸面板没拿到可用的 FaceRig")
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return
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_rig = rig
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_snapshot = rig.painter.snapshot()
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_preset_before = rig.preset_path
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if blank_face != null:
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rig.set_preset(blank_face, blank_face.resource_path)
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rig.clear_paint()
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_canvas_rect.texture = rig.painter.texture
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# 画布只显示笔画层，底下得把底图一起摆出来 —— 不然玩家是在对着空气画
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_preset_rect.texture = rig.material.get_shader_parameter("base_tex") as Texture2D
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rig.painter.brush_color = _color_button.color
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rig.painter.brush_width = _width_slider.value
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rig.painter.erasing = _eraser_toggle.button_pressed
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visible = true
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# ---------------- 画布输入 ----------------
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## 屏幕坐标 → 画布坐标。显示尺寸和画布尺寸不一致时按比例缩
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func _canvas_pos(event: InputEventMouse) -> Vector2:
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var scale := float(_rig.painter.canvas_size) / maxf(1.0, _canvas_rect.size.x)
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return event.position * scale
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func _on_canvas_input(event: InputEvent) -> void:
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if _rig == null:
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return
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if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
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# 自己记「按没按下」，不靠 motion 事件里的 button_mask —— 那个字段不总是可靠
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_drawing = event.pressed
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if event.pressed:
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_rig.painter.begin_stroke(_canvas_pos(event))
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else:
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_rig.painter.end_stroke()
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elif event is InputEventMouseMotion and _drawing:
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_rig.painter.extend_stroke(_canvas_pos(event))
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# ---------------- 工具条 ----------------
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func _on_color_changed(c: Color) -> void:
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if _rig != null:
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_rig.painter.brush_color = c
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# 选了颜色就顺手退出橡皮 —— 不然「我选了红色怎么还是擦」
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_eraser_toggle.set_pressed_no_signal(false)
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if _rig != null:
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_rig.painter.erasing = false
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func _on_width_changed(w: float) -> void:
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if _rig != null:
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_rig.painter.brush_width = w
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_width_label.text = "%d px" % int(w)
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func _on_eraser_toggled(on: bool) -> void:
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if _rig != null:
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_rig.painter.erasing = on
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func _on_clear() -> void:
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if _rig != null:
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_rig.painter.clear()
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func _on_done() -> void:
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if _rig != null:
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_rig.save()
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visible = false
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finished.emit()
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func _on_cancel() -> void:
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if _rig != null:
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if _snapshot.size() > 0:
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_rig.painter.restore(_snapshot)
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# 底图也要还原 —— 「自己画」把它换成空白了，只还原笔画会留下一张白脸
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if not _preset_before.is_empty() and ResourceLoader.exists(_preset_before):
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_rig.set_preset(load(_preset_before), _preset_before)
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visible = false
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cancelled.emit()
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