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Area2D

Inherits: CollisionObject2D < Node2D < CanvasItem < Node < Object

Category: Core

Brief Description

2D area for detection and 2D physics influence.

Member Functions

bool get_collision_layer_bit ( int bit ) const
bool get_collision_mask_bit ( int bit ) const
Array get_overlapping_areas ( ) const
Array get_overlapping_bodies ( ) const
bool overlaps_area ( Node area ) const
bool overlaps_body ( Node body ) const
void set_collision_layer_bit ( int bit, bool value )
void set_collision_mask_bit ( int bit, bool value )

Signals

area_entered ( Object area )

Emitted when another area enters.

area_exited ( Object area )

Emitted when another area exits.

area_shape_entered ( int area_id, Object area, int area_shape, int self_shape )

Emitted when another area enters, reporting which shapes overlapped.

area_shape_exited ( int area_id, Object area, int area_shape, int self_shape )

Emitted when another area exits, reporting which shapes were overlapping.

body_entered ( Object body )

Emitted when a PhysicsBody2D object enters.

body_exited ( Object body )

Emitted when a PhysicsBody2D object exits.

body_shape_entered ( int body_id, Object body, int body_shape, int area_shape )

Emitted when a PhysicsBody2D object enters, reporting which shapes overlapped.

body_shape_exited ( int body_id, Object body, int body_shape, int area_shape )

Emitted when a PhysicsBody2D object exits, reporting which shapes were overlapping.

Member Variables

  • float angular_damp - The rate at which objects stop spinning in this area. Represents the angular velocity lost per second. Values range from 0 (no damping) to 1 (full damping).
  • String audio_bus_name - The name of the area’s audio bus.
  • bool audio_bus_override - If true the area’s audio bus overrides the default audio bus. Default value: false.
  • int collision_layer - The area’s physics layer(s). Collidable objects can exist in any of 32 different layers. A contact is detected if object A is in any of the layers that object B scans, or object B is in any layers that object A scans. See also collision_mask.
  • int collision_mask - The physics layers this area scans to determine collision detection.
  • float gravity - The area’s gravity intensity (ranges from -1024 to 1024). This value multiplies the gravity vector. This is useful to alter the force of gravity without altering its direction.
  • float gravity_distance_scale - The falloff factor for point gravity. The greater the value, the faster gravity decreases with distance.
  • bool gravity_point - If true gravity is calculated from a point (set via gravity_vec). Also see space_override. Default value: false.
  • Vector2 gravity_vec - The area’s gravity vector (not normalized). If gravity is a point (see is_gravity_a_point), this will be the point of attraction.
  • float linear_damp - The rate at which objects stop moving in this area. Represents the linear velocity lost per second. Values range from 0 (no damping) to 1 (full damping).
  • bool monitorable - If true other monitoring areas can detect this area. Default value: true.
  • bool monitoring - If true the area detects bodies or areas entering and exiting it. Default value: true.
  • float priority - The area’s priority. Higher priority areas are processed first. Default value: 0.
  • SpaceOverride space_override - Override mode for gravity and damping calculations within this area. See the SPACE_OVERRIDE_* constants for values.

Enums

enum SpaceOverride

  • SPACE_OVERRIDE_DISABLED = 0 — This area does not affect gravity/damping.
  • SPACE_OVERRIDE_COMBINE = 1 — This area adds its gravity/damping values to whatever has been calculated so far (in priority order).
  • SPACE_OVERRIDE_COMBINE_REPLACE = 2 — This area adds its gravity/damping values to whatever has been calculated so far (in priority order), ignoring any lower priority areas.
  • SPACE_OVERRIDE_REPLACE = 3 — This area replaces any gravity/damping, even the defaults, ignoring any lower priority areas.
  • SPACE_OVERRIDE_REPLACE_COMBINE = 4 — This area replaces any gravity/damping calculated so far (in priority order), but keeps calculating the rest of the areas.

Description

2D area that detects CollisionObject2D nodes overlapping, entering, or exiting. Can also alter or override local physics parameters (gravity, damping).

Member Function Description

bool get_collision_layer_bit ( int bit ) const

Return an individual bit on the layer mask. Describes whether other areas will collide with this one on the given layer.

bool get_collision_mask_bit ( int bit ) const

Return an individual bit on the collision mask. Describes whether this area will collide with others on the given layer.

Array get_overlapping_areas ( ) const

Returns a list of intersecting Area2Ds. For performance reasons (collisions are all processed at the same time) this list is modified once during the physics step, not immediately after objects are moved. Consider using signals instead.

Array get_overlapping_bodies ( ) const

Returns a list of intersecting PhysicsBody2Ds. For performance reasons (collisions are all processed at the same time) this list is modified once during the physics step, not immediately after objects are moved. Consider using signals instead.

bool overlaps_area ( Node area ) const

If true the given area overlaps the Area2D. Note that the result of this test is not immediate after moving objects. For performance, list of overlaps is updated once per frame and before the physics step. Consider using signals instead.

bool overlaps_body ( Node body ) const

If true the given body overlaps the Area2D. Note that the result of this test is not immediate after moving objects. For performance, list of overlaps is updated once per frame and before the physics step. Consider using signals instead.

void set_collision_layer_bit ( int bit, bool value )

Set/clear individual bits on the layer mask. This makes getting an area in/out of only one layer easier.

void set_collision_mask_bit ( int bit, bool value )

Set/clear individual bits on the collision mask. This makes selecting the areas scanned easier.

© 2014–2018 Juan Linietsky, Ariel Manzur, Godot Engine contributors
Licensed under the MIT License.
http://docs.godotengine.org/en/3.0/classes/class_area2d.html