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https://github.com/tavurth/godot-simple-state
A simple Finite State Machine for Godot
https://github.com/tavurth/godot-simple-state
finite-state-machine fsm-library godot godot-engine
Last synced: 6 days ago
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A simple Finite State Machine for Godot
- Host: GitHub
- URL: https://github.com/tavurth/godot-simple-state
- Owner: tavurth
- License: mit
- Created: 2022-02-19T09:33:45.000Z (over 2 years ago)
- Default Branch: 4.x
- Last Pushed: 2023-12-11T03:25:47.000Z (11 months ago)
- Last Synced: 2024-08-02T06:19:27.766Z (3 months ago)
- Topics: finite-state-machine, fsm-library, godot, godot-engine
- Language: GDScript
- Homepage: https://godotengine.org/asset-library/asset/1242
- Size: 47.9 KB
- Stars: 61
- Watchers: 7
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: Readme.md
- Funding: FUNDING.yml
- License: LICENSE.txt
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README
# Godot Simple State
A clean and easy to use Finite State Machine (FSM) for Godot 3.x
[](https://github.com/godotengine/awesome-godot)
# Usage
1. Install the plugin
2. Enable the plugin
3. Add a `SateMachine` node to your character
4. Add any type of `Node` to the `StateMachine` as a child to create a new script
5. Attach a script to the node
6. Now at runtime you can change to a different state using `$StateMachine.goto("state")`
# Example
The example project contains two states, `idle` and `attack`.
The project will switch between each state automatically every 3 seconds.
# State functionality
The state has a few functionalities, here is an example state:
```ddscript
extends Node2D
var States
var Host
func _state_enter(arg or not):
pass
func _state_exit():
pass
```
If you call `await` in `_state_exit` the `StateMachine` will wait for your `await` to finish before entering the new state.
This is also true for `_state_enter` or other state functions.
```gdscript
func _state_exit():
await get_tree().create_timer(1).timeout
```
### Note: Exit state
`state` will change to `_exit` when the state machine is exiting.
Your state will also be queue-freed.
If running a long while loop in your state logic, be sure to check for `States.is_current()`
# Reference
## StateMachine
### `signal` `state_changed(new_state)`
Emitted whenever the `StateMachine` changes state (but before `_state_enter` is called)
### `goto(state_name: String, args = null)` change the state
`args` can be any or `undefined`
When an arg is passed, the argument will be pushed to the `_state_enter` function.
```gdscript
StateMachine.goto("attack")
StateMachine.goto("attack", some_character)
StateMachine.goto("attack", [some_character_a, some_character_b])
```
The last example would call this function in the `attack` state:
```gdscript
func _state_enter(some_characters: Array):
...
```
### `call(method: String, args = null)` call a function on the current state (if exists)
```gdscript
StateMachine.call("some_method")
StateMachine.call("some_method", my_argument)
StateMachine.call("some_method", [my_arguments])
```
### `now(state: String)`
Returns true if the current state matches `state`
```gdscript
if States.now("afraid"):
# keep running away instead of stopping to look at something
```
### `has(state: String)`
Returns true if exists in our state tree
```gdscript
if States.has("some-other-state"):
# Do something
```
### `is_current()`
Returns true only when called from a function inside the current state
```gdscript
if States.is_current():
This can only be printed in the current state
In any other state this will never be printed
```
### `restart(arg: any or none)`
Restarts the current state
This only calls "\_state_enter" again
it does not reset any variables
## State
`_state_enter(args or not)` will be called when the state is entered (each time)
An argument is only passed if one was passed. (`StateMachine.goto("state", arg)`)
`_state_exit()` will be called when the state is left (each time)
If the following variables exist on your state, they will be injected with dependencies as follows:
`Host` is the `NodePath` input into `StateMachine` i.e. your character controller
`States` is the `StateMachine`
If they do not exist on your state, nothing will be injected.
# Signals
You can connect signals directly to the `StateMachine` node using the following style:
They will be then automatically sent to the current active state if that state has the handler function defined.
