World

Definition

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Info

• World is data structure that stores and manages all of the data.
• You can have multiple worlds.

Classification of data

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• There are two kinds of data in Bevy’s World:
  • Entity/Component,
  • Resource,

Entity/Component

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• You can consisder Component as column and Entity as a row in a database.
• Entity is the id field of that table.
• Empty component is called Component Marker.
• Entity/Component can represent as any data you want. It can be even configuration parameters.
• Access: Query.

Resource

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• If a data is Singleton (only one instance) and Standalone (independent from others) then it is Resource. For example: game’s graphics settings.
• Access: Res.

Full direct access to the World

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fn save_game( 
	// get full access to the World, so we can access all data and do anything world:
	&mut World, 
) { 
	// ... save game data to disk, or something ... 
}

• This System is also known as Exclusive Systems.