godot-docs/classes/class_visibilitynotifier2d.rst

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.. DO NOT EDIT THIS FILE, but the VisibilityNotifier2D.xml source instead.
.. The source is found in doc/classes or modules/<name>/doc_classes.

.. _class_VisibilityNotifier2D:

VisibilityNotifier2D
====================

**Inherits:** :ref:`Node2D<class_Node2D>` **<** :ref:`CanvasItem<class_CanvasItem>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

**Inherited By:** :ref:`VisibilityEnabler2D<class_VisibilityEnabler2D>`

Detects approximately when the node is visible on screen.

Description
-----------

The VisibilityNotifier2D detects when it is visible on the screen. It also notifies when its bounding rectangle enters or exits the screen or a viewport.

If you want nodes to be disabled automatically when they exit the screen, use :ref:`VisibilityEnabler2D<class_VisibilityEnabler2D>` instead.

**Note:** For performance reasons, VisibilityNotifier2D uses an approximate heuristic with precision determined by :ref:`ProjectSettings.world/2d/cell_size<class_ProjectSettings_property_world/2d/cell_size>`. If you need precise visibility checking, use another method such as adding an :ref:`Area2D<class_Area2D>` node as a child of a :ref:`Camera2D<class_Camera2D>` node.

Tutorials
---------

- `2D Dodge The Creeps Demo <https://godotengine.org/asset-library/asset/515>`__

Properties
----------

+---------------------------+-------------------------------------------------------+-------------------------------+
| :ref:`Rect2<class_Rect2>` | :ref:`rect<class_VisibilityNotifier2D_property_rect>` | ``Rect2( -10, -10, 20, 20 )`` |
+---------------------------+-------------------------------------------------------+-------------------------------+

Methods
-------

+-------------------------+-----------------------------------------------------------------------------------------+
| :ref:`bool<class_bool>` | :ref:`is_on_screen<class_VisibilityNotifier2D_method_is_on_screen>` **(** **)** |const| |
+-------------------------+-----------------------------------------------------------------------------------------+

Signals
-------

.. _class_VisibilityNotifier2D_signal_screen_entered:

- **screen_entered** **(** **)**

Emitted when the VisibilityNotifier2D enters the screen.

----

.. _class_VisibilityNotifier2D_signal_screen_exited:

- **screen_exited** **(** **)**

Emitted when the VisibilityNotifier2D exits the screen.

----

.. _class_VisibilityNotifier2D_signal_viewport_entered:

- **viewport_entered** **(** :ref:`Viewport<class_Viewport>` viewport **)**

Emitted when the VisibilityNotifier2D enters a :ref:`Viewport<class_Viewport>`'s view.

----

.. _class_VisibilityNotifier2D_signal_viewport_exited:

- **viewport_exited** **(** :ref:`Viewport<class_Viewport>` viewport **)**

Emitted when the VisibilityNotifier2D exits a :ref:`Viewport<class_Viewport>`'s view.

Property Descriptions
---------------------

.. _class_VisibilityNotifier2D_property_rect:

- :ref:`Rect2<class_Rect2>` **rect**

+-----------+-------------------------------+
| *Default* | ``Rect2( -10, -10, 20, 20 )`` |
+-----------+-------------------------------+
| *Setter*  | set_rect(value)               |
+-----------+-------------------------------+
| *Getter*  | get_rect()                    |
+-----------+-------------------------------+

The VisibilityNotifier2D's bounding rectangle.

Method Descriptions
-------------------

.. _class_VisibilityNotifier2D_method_is_on_screen:

- :ref:`bool<class_bool>` **is_on_screen** **(** **)** |const|

If ``true``, the bounding rectangle is on the screen.

**Note:** It takes one frame for the node's visibility to be assessed once added to the scene tree, so this method will return ``false`` right after it is instantiated, even if it will be on screen in the draw pass.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`