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129 lines
5.0 KiB
ReStructuredText
129 lines
5.0 KiB
ReStructuredText
:github_url: hide
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.. _class_BackBufferCopy:
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BackBufferCopy
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==============
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**繼承：** :ref:`Node2D<class_Node2D>` **<** :ref:`CanvasItem<class_CanvasItem>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`
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這個節點能夠將螢幕中的某個區域複製到緩衝中，方便著色器程式碼存取。
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.. rst-class:: classref-introduction-group
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說明
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----
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用於對目前顯示畫面進行後緩衝的節點。會依據 :ref:`copy_mode<class_BackBufferCopy_property_copy_mode>`\ ，將 **BackBufferCopy** 節點所設定的區域或整個螢幕內容複製到緩衝中。之後可於著色器腳本中透過螢幕紋理存取（亦即帶有 ``hint_screen_texture`` 的 uniform 取樣器）。
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\ **注意：**\ 由於此節點繼承自 :ref:`Node2D<class_Node2D>`\ （而非 :ref:`Control<class_Control>`\ ），錨點與邊距不會套用到子系 :ref:`Control<class_Control>` 節點。視窗大小變更時可能因此產生問題。為避免此情形，請將 :ref:`Control<class_Control>` 衍生節點作為 **BackBufferCopy** 的\ *同層*\ 節點，而非子節點。
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.. rst-class:: classref-introduction-group
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教學
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----
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- :doc:`螢幕讀取著色器 <../tutorials/shaders/screen-reading_shaders>`
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.. rst-class:: classref-reftable-group
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屬性
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----
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.. table::
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:widths: auto
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+-----------------------------------------------+-----------------------------------------------------------+---------------------------------+
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| :ref:`CopyMode<enum_BackBufferCopy_CopyMode>` | :ref:`copy_mode<class_BackBufferCopy_property_copy_mode>` | ``1`` |
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+-----------------------------------------------+-----------------------------------------------------------+---------------------------------+
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| :ref:`Rect2<class_Rect2>` | :ref:`rect<class_BackBufferCopy_property_rect>` | ``Rect2(-100, -100, 200, 200)`` |
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+-----------------------------------------------+-----------------------------------------------------------+---------------------------------+
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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列舉
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----
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.. _enum_BackBufferCopy_CopyMode:
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.. rst-class:: classref-enumeration
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enum **CopyMode**: :ref:`🔗<enum_BackBufferCopy_CopyMode>`
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.. _class_BackBufferCopy_constant_COPY_MODE_DISABLED:
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.. rst-class:: classref-enumeration-constant
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:ref:`CopyMode<enum_BackBufferCopy_CopyMode>` **COPY_MODE_DISABLED** = ``0``
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停用緩衝模式。這代表 **BackBufferCopy** 節點會直接使用它所覆蓋的螢幕區域。
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.. _class_BackBufferCopy_constant_COPY_MODE_RECT:
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.. rst-class:: classref-enumeration-constant
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:ref:`CopyMode<enum_BackBufferCopy_CopyMode>` **COPY_MODE_RECT** = ``1``
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**BackBufferCopy** 會緩衝一個矩形區域。
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.. _class_BackBufferCopy_constant_COPY_MODE_VIEWPORT:
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.. rst-class:: classref-enumeration-constant
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:ref:`CopyMode<enum_BackBufferCopy_CopyMode>` **COPY_MODE_VIEWPORT** = ``2``
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**BackBufferCopy** 會緩衝整個螢幕。
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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屬性說明
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--------
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.. _class_BackBufferCopy_property_copy_mode:
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.. rst-class:: classref-property
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:ref:`CopyMode<enum_BackBufferCopy_CopyMode>` **copy_mode** = ``1`` :ref:`🔗<class_BackBufferCopy_property_copy_mode>`
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.. rst-class:: classref-property-setget
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- |void| **set_copy_mode**\ (\ value\: :ref:`CopyMode<enum_BackBufferCopy_CopyMode>`\ )
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- :ref:`CopyMode<enum_BackBufferCopy_CopyMode>` **get_copy_mode**\ (\ )
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緩衝模式。
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.. rst-class:: classref-item-separator
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----
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.. _class_BackBufferCopy_property_rect:
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.. rst-class:: classref-property
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:ref:`Rect2<class_Rect2>` **rect** = ``Rect2(-100, -100, 200, 200)`` :ref:`🔗<class_BackBufferCopy_property_rect>`
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.. rst-class:: classref-property-setget
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- |void| **set_rect**\ (\ value\: :ref:`Rect2<class_Rect2>`\ )
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- :ref:`Rect2<class_Rect2>` **get_rect**\ (\ )
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此 **BackBufferCopy** 所覆蓋的區域。只有當 :ref:`copy_mode<class_BackBufferCopy_property_copy_mode>` 為 :ref:`COPY_MODE_RECT<class_BackBufferCopy_constant_COPY_MODE_RECT>` 時才會使用。
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.. |virtual| replace:: :abbr:`virtual (本方法通常需要使用者覆寫才能生效。)`
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.. |required| replace:: :abbr:`required (This method is required to be overridden when extending its base class.)`
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.. |const| replace:: :abbr:`const (本方法沒有副作用。不會修改該實例的任何成員變數。)`
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.. |vararg| replace:: :abbr:`vararg (本方法除了這裡描述的參數外，還可以接受任意數量的參數。)`
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.. |constructor| replace:: :abbr:`constructor (本方法用於建構一個型別。)`
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.. |static| replace:: :abbr:`static (本方法無需實例即可呼叫，因此可以直接使用類別名稱呼叫。)`
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.. |operator| replace:: :abbr:`operator (本方法描述將本型別作為左運算元時可用的有效運算子。)`
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.. |bitfield| replace:: :abbr:`BitField (此值是由下列旗標組成的位元遮罩整數。)`
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.. |void| replace:: :abbr:`void (無回傳值。)`
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