[1.18.2] How to store some variables to vanilla items

[Vat1n]

Good morning,

Firstly, I wanted to implement a new function to the nether_star so it give me an approximation of ln(2) in maths.

Therefore, I coded a common event which detects the right click. However, I don't know how or where to store the variable "n" (int) and "result" (double) such that I get a better and better approximation when I click.

Currently, when I right click on a nether_star, it shows me alternatively "1.0", "0.0", "1.0" ... whereas it should tends to 0.6931

Theoricaly, the code should do 1/1 -1/2 +1/3 -1/4 + ...

I sure that the problem comes from the static variables

Here is my code if it can help.

Vat1n

@Mod.EventBusSubscriber(modid = MyMod.MODID, bus = Bus.FORGE)
public class CommonEvents {

    static int n = 1;
    static double result = 0;

    @SubscribeEvent
    public static void getApproxOfLnTwo(PlayerInteractEvent.RightClickItem event){
        if(!event.getPlayer().level.isClientSide){
            if (event.getPlayer().getMainHandItem().getItem() == Items.NETHER_STAR) {
                for (int i = 0; i < n; i++) {
                    if(n%2 == 0){result = result - (1.0 / (double) n);}
                    else{result = result + (1.0 / (double) n);}
                }
                event.getPlayer().sendMessage(new TextComponent("The result is : " + result), Util.NIL_UUID);
                n++;
            }
        }
    }
}

 

[Luis_ST]

You can not store data like this in your EventHandler class, if you want to store data it's recommended to use a Capability.
see:

• https://forge.gemwire.uk/wiki/Capabilities
• https://forge.gemwire.uk/wiki/Capabilities/Attaching

[Vat1n]

Thank you Luis_ST