Timed Modifiers API

Anyone using version 1.2.0 or 1.2.1, please update to 1.2.2!!

Timed Modifiers API

This is an API that allows you to add temporary attribute modifiers that gets removed after a set amount of time.

If you are a player, simply download and add this to your mod folder.
If you are a developer, please read the following to learn how to use this API.

This is an API and does not add new gameplay features. This is just used as a dependency.

Set up

Add this to the build.gradle to depend on this API.

repositories {
    maven {
        url = "https://api.modrinth.com/maven"
    }
}

dependencies {
    modImplementation "maven.modrinth:timed_modifiers_api:{the_version}"
}

The version number will be in the form “x.y.z+[mc_version]`, e.g. `1.0.0+1.21.7“.

How to use

Example Modifier

EntityAttributeModifier modifier = new EntityAttributeModifier(
  Identifier.of("example", "speed"),
  0.6,
  EntityAttributeModifier.Operation.ADD_MULTIPLIED_TOTAL
);

---

Add modifier

This adds a temporary modifier that expires after a duration (in ticks)

TimedModifierAPI.addModifier(living_entity, attribute_type, attribute_modifier, int duration);

Example:

TimedModifierAPI.addModifier(player, EntityAttributes.MOVEMENT_SPEED, modifier, 60);
//Adds a modifier that increases speed by 60% for 60 ticks (3 seconds)

You can make a modifier’s value increase/decrease over its lifetime. To do this, call “.grow()` or `.decay()“.

You need to provide a limit for “.grow()`, but this is optional for `.decay()“.

If you want this to happen in a specific amount of time instead of over the whole lifetime, provide a duration in ticks.

Example:

TimedModifierAPI.addModifier(player, EntityAttributes.MOVEMENT_SPEED, modifier, 100).decay();
//Gradually decreases from +60% to 0% over 100 ticks (5 seconds)

TimedModifierAPI.addModifier(player, EntityAttributes.MOVEMENT_SPEED, modifier, 60).grow(1.2, 30);
//Lasts 60 ticks (3 seconds), value increases from +60% to +120% in 30 ticks (1.5 seconds)

You can even select an easing type and ease the over time change. There are: Sine, Quadratic, Cubic, Quartic, Quintic and Circle.

Call “ease()“ and provide the type of easing.

Example:

TimedModifierAPI.addModifier(player, EntityAttributes.MOVEMENT_SPEED, modifier, 100).decay().ease(EaseHelper.EasingTypes.SINE_OUT);
//Gradually decreases from +60% to 0% over 100 ticks (5 seconds) with sine ease out

---

Remove modifier

This manually removes a temporary modifier before it expires.

TimedModifierAPI.removeModifier(living_entity, attribute_type, identifier);

Example:

TimedModifierAPI.addModifier(player, EntityAttributes.MOVEMENT_SPEED, modifier.id());

---

Clear modifier

This removes all temporary modifiers added via this API.

TimedModifierAPI.clearModifier(living_entity, attribute_type);

Example:

TimedModifierAPI.clearModifier(player, EntityAttributes.MOVEMENT_SPEED);

---

Override Modifier

This will override the current modifier, preventing the error when the same modifier is added.

TimedModifierAPI.overrideModifier(living_entity, attribute_type, modifier, duration);

Example:

TimedModifierAPI.overrideModifier(player, EntityAttributes.MOVEMENT_SPEED, modifier, 40).decay();

---

Update Modifier Value

This can update the value of an existing modifier.

TimedModifierAPI.updateModifier(living_entity, attribute_type, identifier, double);

Example:

TimedModifierAPI.updateModifier(player, EntityAttributes.MOVEMENT_SPEED, modifier.id(), 0.4);

If you want to renew the duration as well, call “renew()“ after that. You can technically call it after you add it too, but that wouldn’t do anything meaningful.

Example:

TimedModifierAPI.updateModifier(player, EntityAttributes.MOVEMENT_SPEED, modifier.id(), 0.3).renew();

---

Get duration

This retrieves the remaining duration (in ticks) of a specific temporary modifier.

TimedModifierAPI.getDuration(living_entity, attribute_type, identifier);

Example:

TimedModifierAPI.getDuration(player, EntityAttributes.MOVEMENT_SPEED, modifier.id());

---

Set/Unset value

This directly sets the value of an attribute instance, ignoring any modifiers and its base value.

TimedModifierAPI.setValue(living_entity, attribute_type, double);

Example:

TimedModifierAPI.setValue(player, EntityAttributes.MOVEMENT_SPEED, 0.088);

This makes the attribute instance return back to its original value.

TimedModifierAPI.unsetValue(living_entity, attribute_type);

---

Check if value is set/obtain the value

This returns whether or not the attribute instance value is set.

TimedModifierAPI.isValueSet(living_entity, attribute_type);

This returns the value that is set, or -1 if the value isn’t set.

TimedModifierAPI.getValueSet(living_entity, attribute_type);

---

Alternative 1

Instead of calling “TimedModifierAPI` over and over again, you can simply cast the entity to `ITimedModifier“ and access the methods, or just ask TimedModifierAPI to cast it.

Example:

ITimedModifier api = (ITimedModifier) player;
//or 
ITimedModifier api = TimedModifierAPI.asApi(player);

//add modifier
api.addModifier(EntityAttributes.MOVEMENT_SPEED, modifier, 60);

//remove modifier
api.removeModifier(EntityAttributes.MOVEMENT_SPEED, modifier.id());

//clear modifiers
api.clearModifier(EntityAttributes.MOVEMENT_SPEED);

//get duration
api.getDuration(EntityAttributes.MOVEMENT_SPEED, modifier.id());

//set Value
api.setValue(EntityAttributes.MOVEMENT_SPEED, 0.088);

//unset value
api.unsetValue(EntityAttributes.MOVEMENT_SPEED);

---

Alternative 2

If you find writing EntityAttributes.XYZ too repetitive, you can even retrieve the “TimedModifierContainer“ of that attribute directly.

Example:

var container = TimedModifierAPI.getContainer(player, EntityAttributes.MOVEMENT_SPEED);
//or
ITimedModifier api = TimedModifierAPI.asApi(player);
var container = api.getContainer(EntityAttributes.MOVEMENT_SPEED);

//and then do whatever you need
container.addModifier(...);

Please note that you cannot call “setValue()`, `unsetValue()`, `isValueSet()` and `getValueSet()` from a container. In order to call these methods, call `asApi()“ first.

Example

container.asApi().setValue(25);

Events

AttributeModifierEvents

This is the class that includes the 4 events.

BEFORE_ADD

This is invoked before a modifier is actually added to the attribute instance.

AttributeModifierEvents.BEFORE_ADD.register((entity, modifier, isPersistent) -> {
    //your logic
});

AFTER_ADD

This is invoked after a modifier is fully added to the attribute instance.

AttributeModifierEvents.AFTER_ADD.register((entity, modifier, isPersistent) -> {
    //your logic
});

BEFORE_REMOVE

This is invoked before a modifier is actually removed from the attribute instance.

AttributeModifierEvents.BEFORE_REMOVE.register((entity, identifier) -> {
    //your logic
});

BEFORE_ADD

This is invoked after a modifier is successfully and fully removed from the attribute instance.

AttributeModifierEvents.AFTER_REMOVE.register((entity, modifier) -> {
    //your logic
});