flame/packages/flame_behavior_tree/behavior_tree

This package provides a simple and easy to use behavior tree API in pure dart.

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Behavior tree is a very common way of implementing AI behavior in game and robotics. Using this, you can break-down a complex behavior of an in game AI, into multiple smaller nodes.

Features

• Nodes
  • Composite
    • Sequence: Continues execution until one of the children fails.
    • Selector: Continues execution until one of the children succeeds.
  • Decorator
    • Inverter: Flips the status of the child node.
    • Limiter: Limits the number of ticks for child node.
  • Task
    • Task: Executes a given callback when ticked.
    • AsyncTask: Executes an async callback when ticked.
    • Condition: Checks a condition when ticked.

Getting started

Add this package to your dart project using,

dart pub add behavior_tree

Usage

• Create a behavior tree.

final treeRoot = Sequence(
  children: [
    Condition(() => isHungry),
    Task(() => goToShop()),
    Task(() => buyFood()),
    Task(() => goToHome()),
    Task(() => eatFood()),
  ]
);

• Tick the root node to update the tree.

final treeRoot = ...;
treeRoot.tick();