Pixi’VN 2D game engine

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Game storage ​

What is the game storage? The game storage is a place where you can save variables that you want to keep between game sessions.

It is essential to understand that if variables are not saved in the game memory, the engine will not be able to handle them, when you load a save or when you go back.

Additionally, in the game archive you can save any type of variable, except class and function (because they cannot be converted to JSON), such as: string, number, boolean, object, array... If you want to save "flags" (boolean) it is recommended to use the flags functionality, a very high-performance flag management system.

Set a variable in the game storage ​

To set a variable in the game storage, you can use the storage.setVariable, which takes two parameters: the variable name and the value.

typescript
import { storage } from '@drincs/pixi-vn'

storage.setVariable("myVariable", 42);

Get a variable from the game storage ​

To get a variable from the game storage, you can use the storage.getVariable, which takes one parameter: the variable name.

typescript
import { storage } from '@drincs/pixi-vn'

const myVariable = storage.getVariable<number>("myVariable");

Remove a variable from the game storage ​

To remove a variable from the game storage, you can use the storage.removeVariable, which takes one parameter: the variable name.

typescript
import { storage } from '@drincs/pixi-vn'

storage.removeVariable("myVariable");

Temporary storage ​

In many occasions it is useful to use variables only for a certain time. Using normal storage we should worry about eliminating these variables once they are no longer needed, to ensure that we take up less space and have lighter saves.

To solve this problem, Pixi’VN has a temporary storage system. Temporary variables initialized in a label will be deleted when it is closed. So if a label is called from it, the temporary variable will still be accessible from the child label. Obviously, if a label is called from it with the jump (so the current label will be closed and the new one started) the temporary variable will no longer be accessible.

Set a temporary variable:

To set a temporary variable, you can use the storage.setTempVariable, which takes two parameters: the variable name and the value.

typescript
import { storage } from '@drincs/pixi-vn'

storage.setTempVariable("myTempVariable", 42);

Get a temporary variable:

To get a temporary variable, you can use the normal storage.getVariable function.

Remove a temporary variable:

To remove a temporary variable, you can use the storage.removeTempVariable, which takes one parameter: the variable name.

typescript
import { storage } from '@drincs/pixi-vn'

storage.removeTempVariable("myTempVariable");

System variables ​

In storage game, there are some system variables that are used by the game engine. All system variables start with the prefix ___. So please avoid using this prefix in your variables.

You can get all the system variables keys with the SYSTEM_RESERVED_STORAGE_KEYS function.

icon Keyv ​

The entire storage system was developed using Map, a native JavaScript object, so you can use Keyv interact with game storage.

What is Keyv? Keyv is a simple key-value storage. It is a very easy-to-use system and very popular in the Node.js community. Keyv can be combined with other libraries, such as Cacheable (Caching for Nodejs based on Keyv).

You can learn more about Keyv on the Keyv website.

How to use Keyv with Pixi’VN? You can use Keyv with Pixi’VN by creating a new instance of Keyv and passing the storage object as a parameter.

typescript
import { storage } from '@drincs/pixi-vn'
import Keyv from 'keyv';

const keyvStorage = new Keyv({ store: storage.storage });

keyvStorage.get<string>("myValue").then((value) => {
    console.log(value);
});