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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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**继承：** :ref:`Node2D<class_Node2D>` **<** :ref:`CanvasItem<class_CanvasItem>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`
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这种节点能够将屏幕中的某个区域复制到缓冲中，方便从着色器代码中访问。
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.. rst-class:: classref-introduction-group
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描述
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----
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用于后台缓冲当前显示屏幕的节点。会根据 :ref:`copy_mode<class_BackBufferCopy_property_copy_mode>` 对 **BackBufferCopy** 节点中定义的区域所覆盖的屏幕内容或整个屏幕进行缓冲。可以在着色器脚本中使用屏幕纹理来访问（即带有 ``hint_screen_texture`` 的 uniform 采样器）。
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\ **注意：**\ 由于该节点继承自 :ref:`Node2D<class_Node2D>`\ （而非 :ref:`Control<class_Control>`\ ），因此锚点和边距不适用于子 :ref:`Control<class_Control>` 派生节点。这在调整窗口大小时可能会出现问题。为避免这种情况，请将 :ref:`Control<class_Control>` 派生节点添加为 **BackBufferCopy** 节点的\ *同级*\ 节点，而不是将它们添加为子节点。
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.. rst-class:: classref-introduction-group
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教程
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----
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- :doc:`读屏着色器 <../tutorials/shaders/screen-reading_shaders>`
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.. rst-class:: classref-reftable-group
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属性
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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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枚举
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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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禁用缓冲模式。这意味着该 **BackBufferCopy** 节点将直接使用它所覆盖的屏幕部分。
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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** 缓冲一个矩形区域。
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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** 缓冲整个屏幕。
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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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属性说明
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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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缓冲模式。
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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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该 **BackBufferCopy** 所覆盖的区域。只有当 :ref:`copy_mode<class_BackBufferCopy_property_copy_mode>` 为 :ref:`COPY_MODE_RECT<class_BackBufferCopy_constant_COPY_MODE_RECT>` 时才使用。
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.. |virtual| replace:: :abbr:`virtual (本方法通常需要用户覆盖才能生效。)`
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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 (本方法无副作用，不会修改该实例的任何成员变量。)`
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.. |vararg| replace:: :abbr:`vararg (本方法除了能接受在此处描述的参数外，还能够继续接受任意数量的参数。)`
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.. |constructor| replace:: :abbr:`constructor (本方法用于构造某个类型。)`
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.. |static| replace:: :abbr:`static (调用本方法无需实例，可直接使用类名进行调用。)`
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.. |operator| replace:: :abbr:`operator (本方法描述的是使用本类型作为左操作数的有效运算符。)`
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.. |bitfield| replace:: :abbr:`BitField (这个值是由下列位标志构成位掩码的整数。)`
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.. |void| replace:: :abbr:`void (无返回值。)`
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