Game Rules

The MOOG Environment class takes a game_rules keyword argument that is an iterable of game rules. These game rules implement all of the dynamics of the environment not implemented by the physics. Intuitively, physics should implement forces, whereas game rules should implement higher-level transition dynamics, such as sprites appearing/disappearing, changing color, etc.

Game rules must satisfy the API of AbstractRule. In this directory are a few different kinds of game rules. These can be combined in various ways to implement a wide variety of tasks (see our example tasks).

However, if game rules are insufficient for you to implement your task, by all means implement a custom game rule inheriting from AbstractRule — typically this can be done with only a few lines of code. In the functional_maze.py example config we have an example of a custom game rule implemented in the config.

Task phases

We want to draw particular attention to the rules in task_phases.py, which are useful when your task trials have phases. For example, your task may have a fixation phase at the beginning of each trial. The Phase and PhaseSequence provide a way to compose trial phases with conditional transitions between them.

For examples of phase rules, see the match_to_sample and multi_tracking_with_feature.py example configs.

Sub-modules

moog.game_rules.abstract_rule

Abstract game rule.

moog.game_rules.change_layer

Rules that move sprites from one layer to another.

moog.game_rules.conditional

Rule that is applied only when a condition is satisfied …

moog.game_rules.contact_rules

Rules and functions involving sprite contacts …

moog.game_rules.create_sprites

Rule that creates new sprites.

moog.game_rules.fixation

Rule that can be used to monitor fixation …

moog.game_rules.modify_meta_state

Rules that modify environment meta_state.

moog.game_rules.modify_sprites

Rules that modify sprites.

moog.game_rules.portal

Portal …

moog.game_rules.re_center

Rules that re-center a sprite periodically …

moog.game_rules.task_phases

Rules to facilitate tasks with phases …

moog.game_rules.timing

Rules that control the timing of when to apply other rules …

moog.game_rules.vanish

Rules that make sprites vanish.