There are four categories of vectors that can be utilized by the diseases the user can create: WORLD, ENTITY, ITEM, and ACTION. These categories each contain several types of vectors that can be customized and fire upon the corresponding action in game.

Types of Vectors

World Vectors

World vectors are vectors that occur when a player interacts with the world passively (or is interacted with). The following are world vectors and how to use them.

Type	Parameter Type	Description
biome_temp_and_downfall	Temperature/Downfall	Separate with ; if checking both values
in_biome	Biome
inwater_biome	Biome
inwater_temp	Temperature	Make negative to test for < (less than) values.
in_water	no parameters required
is_wet	no parameters required
lightning	no parameters required
dim_enter	Dimension
stat	Statistic and value (Integer)	Make value negative to calculate less than (<) and remember to separate parameters with semicolon ';'
time_since_rest	Number of ticks (1 tick = 1/20th of a second)	A statistic vector that specifically targets time since sleeping
time_since_death	Number of ticks (1 tick = 1/20th of a second)	A statistic vector that specifically targets time since last death, can be targeted for old age.

Entity Vectors

Entity vectors occur when a player interacts in some way with an entity (distance, interact, etc.). The following are entity vectors:

Type	Parameter Type	Description
entity_interact	Entity
entity_aabb	Entity

Item Vectors

Item vectors occur in the various life-cycle of item creation and use. Specific actions are in the Action Vectors. The following are item vectors:

Type	Parameter Type	Description
equip_change_<slot>	Item	Use slot (resource tag) for type name
pickup_item	Item
craft_item	Item
smelt_item	Item
brew_item	Item
use_item	Item
destroy_item	Item
item_break	Item

Action Vectors

Action vectors occur when utilizing items or being interacted with by entities (e.g. damage). The following are action vectors:

Type	Parameter Type	Description
player_awaken	no parameters required
damage_<damage_source>	Entity [optional, if damage_source is "mob"]	Use damage source for type
shield_block	no parameters required
bonemeal_use	isHarvestable (boolean; true/false) [optional]
fished	Item [optional]
sleep	BedSleepingProblem [optional]
break_block	Block
arrow_attempt	failShotIfInfected (boolean; true/false) [optional]

Implementing Vectors Into Your Diseases

When entering a vector in the disease JSON file for a specific disease, it should be formatted as such within the JsonArray of "vectors:"

{  
    "type":"", // REMEMBER to use a namespace (e.g., "diseasecraft:")  
    "heap:"", // The parameter (if needed for the vector, leave blank if optional and not wanted)  
    "weight":2 // The chance of contracting the illness every time the vector fires [stored with the base disease, not with the vector]  
}  

Here is an annotated example from the base mod code:

"vectors": [
	{ 
		"type":"diseasecraft:entity_aabb", // This is an entity vector, notice the use of the namespace "diseasecraft:", which is used for all base mod vectors.
		"heap":"minecraft:pig", // The parameter for this vector is an entity and we are using the resource name for a pig, but this can be used for other mod animals as well.
		"weight":3 // There is a 3% chance every second you stand within 2m of a pig that you will contract this disease.
	},
	{ 
		"type":"diseasecraft:entity_aabb", // Note how the type is able to be the same as a previous vector for even the same disease.
		"heap":"minecraft:chicken", // This is because disease vectors are compared to each other both in their type and parameters.
		"weight":1 // As stated above, the weight is stored with the disease (NOT the vector), so it plays no role in comparisons.
	}
]