To make a zoom key, you need to add some event listeners. We can do it this way. Here is the event listener code:

@SubscribeEvent
public static void onFovChange(FOVUpdateEvent fovEvent) {
    // Update the original FOV variable
    if(YourMainClass.originalFov != fovEvent.getNewfov() && fovEvent.getNewfov() != YourMainClass.zoomedInFOV)
        YourMainClass.originalFov=fovEvent.getNewfov();
}

@SubscribeEvent
public static void onKeyPress(KeyboardKeyPressedEvent keyEvent) {
    if(keyEvent.getKeyCode()==YourMainClass.zoomKeyCode)
            YourMainClass.mc.gameSettings.fov=YourMainClass.zoomedInFOV;
}
    
@SubscribeEvent
public static void onKeyRelease(KeyboardKeyReleasedEvent keyEvent) {
    if(keyEvent.getKeyCode()==YourMainClass.zoomKeyCode)
            YourMainClass.mc.gameSettings.fov=YourMainClass.originalFov;
}

 

Now we need to define some variables in our main class. This is the code:

public static Minecraft mc=Minecraft.getInstance();

public final static int zoomKeyCode=GLFW.GLFW_KEY_(key here);
public final static int zoomedInFOV=40;

// The next line of code goes in the FMLCommonSetupEvent event function

originalFov=mcInstance.gameSettings.fov;

 

Wait, we also need to register some events. If you are making the SubscribeEvent functions static, you can do it with this:

MinecraftForge.EVENT_BUS.register(YourEventListener.class)

 

If you are making the SubscribeEvent functions non-static, you can do it with this:

MinecraftForge.EVENT_BUS.register(new YourEventListener())

 

There we go! This is a custom zoom key.

Edited April 14, 20214 yr by andrussy44
Make it meet the "tutorial requirements". For example, I used "wee

1. This is problematic for sidedness.

2. Minecraft uses GLFW keybindings, not AWT KeyEvent. Use a KeyBinding regardless.

3. This is not a tutorial. Nothing is explained, just copy this and get a result.