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 grow/decay 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();

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);