Stamina Attributes

This API adds a stamina system controlled by entity attributes.

Default implementation

LivingEntities can have up to staminaattributes:max_stamina amounts of stamina. Stamina is regenerated by staminaattributes:stamina_regeneration every staminaattributes:stamina_tick_threshold ticks.

When stamina is reduced, regeneration is stopped for staminaattributes:stamina_regeneration_delay_threshold ticks.

When stamina is <= 0, regeneration is stopped for staminaattributes:depleted_stamina_regeneration_delay_threshold ticks.

staminaattributes:reserved_stamina describes the percentage amount of maximum stamina that is currently not available.

staminaattributes:item_use_stamina_cost is the amount of stamina that is reduced when using an item with a stamina cost.
There are two ways to give an item a stamina cost:

1. Items in the "staminaattributes:using_costs_stamina" item tag reduce stamina by staminaattributes:item_use_stamina_cost
   when they are used once. When stamina is < 0 the use action is not performed. In that case the item gets a cooldown,
   configured in the server config.
2. Items in the "staminaattributes:continuous_using_costs_stamina" item tag reduce stamina by staminaattributes:item_use_stamina_cost every tick while they are used. When stamina is < 0, the usage is cancelled. In
   that case the item gets a cooldown, configured in the server config.

The different staminaattributes:*_tick_stamina_cost attributes describe the stamina cost for the corresponding activity. This cost is
applied every tick (20x per second). This includes the following activities:

• sprinting
• sneaking
• walking
• swimming
• walking underwater
• walking in water
• climbing

The different staminaattributes:*_action_stamina_cost attributes describe the stamina cost for the corresponding actions. This cost is
applied once every time the action is performed. This includes the following actions:

• jumping
• sprint jumping
• attack blocking
• attacking
• block breaking

Several activities and actions can be configured to require stamina. If stamina is 0 or lower, they can't be performed.
This includes:

• jumping
• sprinting
• swimming
• attacking
• block breaking
• attacking
• attack blocking

Blocks that can be broken instantly by hand (blocks with a "destroyTime" of 0) can be excluded from the stamina
requirement.

Exhaustion

If a player has 0 or less stamina, they are exhausted, which means that a status effect is applied. This status effect
is defined in the server config.

This feature can be enabled in the server config, but it's disabled by default.

Default attribute values

• staminaattributes:max_stamina: 10 (10 for players)
• staminaattributes:stamina_regeneration: 0 (1 for players)
• staminaattributes:stamina_tick_threshold: 20
• staminaattributes:stamina_regeneration_delay_threshold: 20
• staminaattributes:depleted_stamina_regeneration_delay_threshold: 60
• staminaattributes:reserved_stamina: 0
• staminaattributes:item_use_stamina_cost: 0 (0.05 for players)
• staminaattributes:sprinting_tick_stamina_cost: 0 (0.05 for players)
• staminaattributes:sneaking_tick_stamina_cost: 0 (0.05 for players)
• staminaattributes:walking_tick_stamina_cost: 0
• staminaattributes:swimming_tick_stamina_cost: 0 (0.05 for players)
• staminaattributes:walking_underwater_tick_stamina_cost: 0 (0.05 for players)
• staminaattributes:walking_in_water_tick_stamina_cost: 0 (0.05 for players)
• staminaattributes:climbing_tick_stamina_cost: 0 (0.05 for players)
• staminaattributes:jumping_action_stamina_cost: 0 (1 for players)
• staminaattributes:sprint_jumping_action_stamina_cost: 0 (1 for players)
• staminaattributes:attack_blocking_action_stamina_cost: 0 (1 for players)
• staminaattributes:attacking_action_stamina_cost: 0 (1 for players)
• staminaattributes:block_breaking_action_stamina_cost: 0 (1 for players)

All default values for players can be set in the server config.

Default item tags

"staminaattributes:using_costs_stamina":

{
	"values": [
		"minecraft:snowball"
	]
}

"staminaattributes:continuous_using_costs_stamina":

{
	"values": [
		"minecraft:bow",
		"minecraft:crossbow",
		"minecraft:shield"
	]
}

Customization

The client config allows customizing the HUD element.

Using the stamina system

Java

Casting a "LivingEntity" to the "StaminaUsingEntity" interface gives access to all relevant methods.

Data packs

Stamina Attributes implements several data driven methods to interact with the current stamina value of an entity.

• the "staminaattributes:add_stamina" enchantment effect allows adding a defined amount to the current stamina
• the "staminaattributes:stamina_using_entity" entity sub predicate passes when the current stamina of an entity matches
  the defined range

Example

This enchantment reduces stamina of the attacker by 2, as long as the attacker has at least 5 stamina:

{
	"anvil_cost": 1,
	"description": {
		"translate": "enchantment.staminaattributes.test"
	},
	"effects": {
		"minecraft:post_attack": [
			{
				"affected": "attacker",
				"effect": {
					"type": "staminaattributes:add_stamina",
					"amount": {
						"type": "minecraft:linear",
						"base": -2.0,
						"per_level_above_first": -2.0
					}
				},
				"enchanted": "attacker",
				"requirements": {
					"condition": "minecraft:entity_properties",
					"entity": "direct_attacker",
					"predicate": {
						"type_specific": {
							"type": "staminaattributes:stamina_using_entity",
							"stamina_amount": {
								"min": 5.0
							}
						}
					}
				}
			}
		]
	},
	"max_cost": {
		"base": 25,
		"per_level_above_first": 8
	},
	"max_level": 1,
	"min_cost": {
		"base": 5,
		"per_level_above_first": 8
	},
	"slots": [
		"hand"
	],
	"supported_items": "#minecraft:swords",
	"weight": 5
}