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154 lines
5.8 KiB
ReStructuredText
154 lines
5.8 KiB
ReStructuredText
:github_url: hide
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.. _class_VisibleOnScreenNotifier2D:
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VisibleOnScreenNotifier2D
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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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**派生：** :ref:`VisibleOnScreenEnabler2D<class_VisibleOnScreenEnabler2D>`
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2D 空间的矩形区域，用于检测其在屏幕上是否可见。
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.. rst-class:: classref-introduction-group
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描述
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----
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**VisibleOnScreenNotifier2D** 表示 2D 空间的矩形区块。当该区块的任何部分在屏幕或视口中可见时，它将发出 :ref:`screen_entered<class_VisibleOnScreenNotifier2D_signal_screen_entered>` 信号，同样，当其任何部分都不可见时，它将发出 :ref:`screen_exited<class_VisibleOnScreenNotifier2D_signal_screen_exited>` 信号。
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如果希望当该区块在屏幕上可见时自动启用节点，请使用 :ref:`VisibleOnScreenEnabler2D<class_VisibleOnScreenEnabler2D>`\ 。
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\ **注意：**\ **VisibleOnScreenNotifier2D** 使用渲染剔除代码来确定它在屏幕上是否可见，因此除非 :ref:`CanvasItem.visible<class_CanvasItem_property_visible>` 被设置为 ``true``\ ，否则它不会起作用。
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.. rst-class:: classref-introduction-group
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教程
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----
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- `2D Dodge The Creeps 演示 <https://godotengine.org/asset-library/asset/2712>`__
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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:`Rect2<class_Rect2>` | :ref:`rect<class_VisibleOnScreenNotifier2D_property_rect>` | ``Rect2(-10, -10, 20, 20)`` |
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+---------------------------+----------------------------------------------------------------------+-----------------------------+
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| :ref:`bool<class_bool>` | :ref:`show_rect<class_VisibleOnScreenNotifier2D_property_show_rect>` | ``true`` |
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+---------------------------+----------------------------------------------------------------------+-----------------------------+
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.. rst-class:: classref-reftable-group
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方法
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----
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.. table::
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:widths: auto
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+-------------------------+----------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`is_on_screen<class_VisibleOnScreenNotifier2D_method_is_on_screen>`\ (\ ) |const| |
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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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信号
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----
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.. _class_VisibleOnScreenNotifier2D_signal_screen_entered:
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.. rst-class:: classref-signal
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**screen_entered**\ (\ ) :ref:`🔗<class_VisibleOnScreenNotifier2D_signal_screen_entered>`
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当该 VisibleOnScreenNotifier2D 进入屏幕时发出。
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.. rst-class:: classref-item-separator
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----
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.. _class_VisibleOnScreenNotifier2D_signal_screen_exited:
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.. rst-class:: classref-signal
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**screen_exited**\ (\ ) :ref:`🔗<class_VisibleOnScreenNotifier2D_signal_screen_exited>`
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当该 VisibleOnScreenNotifier2D 退出屏幕时发出。
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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_VisibleOnScreenNotifier2D_property_rect:
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.. rst-class:: classref-property
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:ref:`Rect2<class_Rect2>` **rect** = ``Rect2(-10, -10, 20, 20)`` :ref:`🔗<class_VisibleOnScreenNotifier2D_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 VisibleOnScreenNotifier2D 的边界矩形。
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.. rst-class:: classref-item-separator
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----
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.. _class_VisibleOnScreenNotifier2D_property_show_rect:
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.. rst-class:: classref-property
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:ref:`bool<class_bool>` **show_rect** = ``true`` :ref:`🔗<class_VisibleOnScreenNotifier2D_property_show_rect>`
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.. rst-class:: classref-property-setget
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- |void| **set_show_rect**\ (\ value\: :ref:`bool<class_bool>`\ )
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- :ref:`bool<class_bool>` **is_showing_rect**\ (\ )
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如果为 ``true``\ ，则在编辑器中以半透明的洋红色填充显示 :ref:`rect<class_VisibleOnScreenNotifier2D_property_rect>` 的矩形区域。这样做与更改 VisibleOnScreenNotifier2D 的可见性不同，不会影响屏幕剔除检测。
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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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方法说明
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--------
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.. _class_VisibleOnScreenNotifier2D_method_is_on_screen:
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.. rst-class:: classref-method
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:ref:`bool<class_bool>` **is_on_screen**\ (\ ) |const| :ref:`🔗<class_VisibleOnScreenNotifier2D_method_is_on_screen>`
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如果为 ``true``\ ，则边界矩形在屏幕上。
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\ **注意：**\ **VisibleOnScreenNotifier2D** 被添加到场景树后需要一帧才能确定其可见性，因此该方法在它被实例化后，在绘制阶段之前，将始终返回 ``false`` 。
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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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