MineClone2/mods/ITEMS/mcl_bone_meal/API.md

Bone meal API

Bonemealing callbacks and particle functions.

_on_bone_meal(itemstack, placer, pointed_thing)

The bone meal API provides a callback definition that nodes can use to register a handler that is executed when a bone meal item is used on it.

Nodes that wish to use the bone meal API should in their node registration define a callback handler named _on_bone_meal.

Note that by registering the callback handler, the node declares that bone meal can be used on it and as a result, when the user is not in creative mode, the used bone meal is spent and taken from the itemstack passed to the on_place() handler of the bone meal item used regardless of whether the bone meal had an effect on the node and regardless of the result of the callback handler.

It is for all intents and purposes up to the callback defined in the node to decide how to handle the specific effect that bone meal has on that node.

The _on_bone_meal callback handler is a

function(itemstack, placer, pointed_thing)

Its arguments are:

• itemstack: the stack of bonem eal being applied
• placer: ObjectRef of the player who aplied the bone meal, can be nil!
• pointed_thing: exact pointing location (see Luanti API), where the bone meal is applied

The return value of the handler function indicates if the bonemealing had its intended effect. If true, 'bone meal particles' are spawned at the position of the bonemealed node.

The on_place code in the bone meal item will spawn bone meal particles and decrease the bone meal itemstack if the handler returned true and the placer is not in creative mode.

mcl_bone_meal.add_bone_meal_particle(pos, def)

Spawns standard or custom bone meal particles.

• pos: position, is ignored if you define def.minpos and def.maxpos
• def: (optional) particle definition; see minetest.add_particlespawner() for more details.

mcl_bone_meal.use_bone_meal(itemstack, placer, pointed_thing)

For use in on_rightclick handlers that need support bone meal processing in addition to other behaviors. Before calling, verify that the player is wielding bone meal.

• itemstack: The stack of bone meal being used
• placer: ObjectRef of the player who aplied the bone meal, can be nil!
• pointed_thing: exact pointing location (see Luanti API), where the bone meal is applied

Returns itemstack with one bone meal consumed if not in creative mode.

Legacy API

The bone meal API also provides a legacy compatibility function. This function is not meant to be continued and callers should migrate to the newer bonemealing API.

mcl_bone_meal.register_on_bone_meal_apply(function(pointed_thing, placer))

Called when the bone meal is applied anywhere.

• pointed_thing: exact pointing location (see Luanti API), where the bone meal is applied
• placer: ObjectRef of the player who aplied the bone meal, can be nil! This function is deprecated and will be removed at some time in the future. Bone meal is not consumed unless the provided function returns true.

mcl_dye.add_bone_meal_particle(pos, def)

mcl_dye.register_on_bone_meal_apply(function(pointed_thing, user))

These shims in mcl_dye that point to corresponding legacy compatibility functions in mcl_bone_meal remain for legacy callers that have not yet been updated to the new API. These shims will be removed at some time in the future.