1 stable release
1.0.0 | Jul 21, 2024 |
---|
#1347 in Game dev
Used in 2 crates
160KB
4.5K
SLoC
reactor_spatial
A 2d transform system for the Bevy game engine that supports Transform propagation controls.
Core Types
Position2D
The Position2D
struct represents a 2D point in space. It has two fields: x
and y
, representing the Cartesian coordinates of the point.
Rotation2D
The Rotation2D
struct represents a 2D rotation. It can be used with either radians or degrees.
Scale2D
The Scale2D
struct represents a 2D scale. It has two fields: x
and y
, representing the scale factors for the x and y axes respectively.
SpatialBundle2D
The SpatialBundle2D
struct represents the spatial state of a transform in 2D. It contains a Position2D
, Rotation2D
, and Scale2D
. It provides a convenient way to store and manipulate the spatial state of your game objects.
When you add a SpatialBundle2D
to an entity, it will also automatically add a SpatialBundle
, making it easy to use the spatial 2D system with Bevy's built-in transform system.
DrawOrder
The DrawOrder
struct is used to specify the draw layering of entities in your game. It is a wrapper over an f32, with higher values drawing above lower values.
propagation Types
The following enums are used to control how the spatial components of an entity are propagated to its children.
PositionPropagation
The PositionPropagation
enum has two variants:
Relative: **[Default]**The position of a child entity is relative to its parent's position.
Absolute: The position of a child entity is absolute and does not take into account its parent's position.
RotationPropagation
The RotationPropagation
enum has two variants:
Relative: **[Default]**The rotation of a child entity is relative to its parent's rotation.
Absolute: The rotation of a child entity is absolute and does not take into account its parent's rotation.
By default, both PositionPropagation
and RotationPropagation
are set to Relative
.
ScalePropagation
The ScalePropagation
enum has two variants:
Relative: **[Default]**The rotation of a child entity is relative to its parent's rotation.
Absolute: The rotation of a child entity is absolute and does not take into account its parent's rotation.
Compasses
In addition to the above, and not included in the SpatialBundle2D
are Compass
, CompassRose
, and CompassHalfwinds
. It is very common in 2D games to need to know the compass direction a given entity is facing in order to choose which sprite to draw. These enums can be included as a component on anything with a Rotation2D
, and as part of transform propagation, there values will be updated to match the objects rotation.
Feature Flags
serde
- Adds impls forserde:Serialize
andserde:Deserialize
Usage
Add the crate to your Cargo.toml
Add SpatialPlugin
to your app.
Dependencies
~40–77MB
~1.5M SLoC