throwing/README.md
2017-07-09 18:52:25 +02:00

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# Throwing
## Developped by the Mynetest team
This mod is an API for registering throwing and throwable things.
Mods based on this API:
* [throwing_arrows](https://github.com/MT-Eurythmia/throwing_arrows) is a compatible replacement for the throwing mod by PilzAdam.
* [sling](https://github.com/tacotexmex/sling) is a mod written by @tacotexmex that enables item stack and single item throwing of any item.
## Configuration
The settings are the following:
```
throwing.velocity_factor = 19
throwing.horizontal_acceleration_factor = -3
throwing.vertical_acceleration = -10
throwing.allow_arrow_placing = false
throwing.bow_cooldown = 0.2
```
## API
There are two available functions in the mod API:
```lua
function throwing.register_bow(name, definition)
--[[
Name: Bow name. If it doesn't contain ":", the "throwing:" prefix will be added.
Definition: definition table, containing:
* itemcraft (optional, you may want to register your own craft or to make the bow uncraftable): item used to craft the bow.
* description (highly recommended): description of the bow.
* texture (essential): texture of the bow, shown in inventory.
* groups (optional): groups of the item.
* uses: number of uses of the bow (default is 50).
* allow_shot (optional): function(player, itemstack, index, last_run):
- player: the player using the bow
- itemstack: the itemstack of the bow
- index: index of the arrow in the inventory
- last_run: whether this is the last time this function is called before actually calling `spawn_arrow_entity`.
Currently, `allow_shot` is actually run twice (once before the delay, and once after).
- should return true if the shot can be made, and false otherwise
- the default function checks that the arrow to be thrown is a registered arrow
- it can return a second return value, which is the new itemstack
* throw_itself (optional): whether the bow should throw itself instead of the arrow next to it in the inventory.
If present, allow_shot is ignored.
Default is false.
* cooldown: bow cooldown. Default is setting throwing.bow_cooldown
* function spawn_arrow_entity(position, arrow, player): defaults to throwing.spawn_arrow_entity
* sound: sound to be played when the bow is used
* delay: delay before throwing the arrow
]]
-- Example:
throwing.register_bow("bow_wood", {
itemcraft = "default:wood",
description = "Wooden Bow",
texture = "throwing_bow_wood.png"
})
itemcraft, craft_quantity, description, tiles, on_hit_sound, on_hit[, on_throw[, groups]]
function throwing.register_arrow(name, definition table)
--[[
Name: Arrow name. If it doesn't contain ":", the "throwing:" prefix will be added.
Definition: definition table, containing:
* itemcraft (optional, you may want to register your own craft or to make the arrow uncraftable): item used to craft the arrow.
* craft_quantity (optional, defaulting to 1 if itemcraft is non-nil, pointless otherwise): quantity of arrows in the craft output.
* tiles (essential): tiles of the arrow.
* target (optional, defaulting to throwing.target_both): what the arrow is able to hit (throwing.target_node, throwing.target_object, throwing.target_both).
* allow_protected (optional, defaulting to false): whether the arrow can be throw in a protected area
* on_hit_sound (optional): sound played when the arrow hits a node or an object.
* on_hit(self, pos, last_pos, node, object, hitter, data) (optional but very useful): callback function:
- pos: the position of the hit node or object.
- last_pos: the last air node where the arrow was
- node and object: hit node or object. Either node or object is nil, depending
whether the arrow hit a node or an object.
- hitter: an ObjectRef to the thrower player.
- data: a data table associated to the entity where you can store what you want
- self: the arrow entity table (it allows you to hack a lot!)
- If it fails, it should return:
false[, reason]
* on_throw(self, pos, thrower, itemstack, index, data) (optional): callback function: on_throw:
- pos: the position from where the arrow is throw (which a bit higher than the hitter position)
- thrower: an ObjectRef to the thrower player
- next_index: the index next to the arrow in the "main" inventory
- data: a data table associated to the entity where you can store what you want
- self: the arrow entity table
- If the arrow shouldn't be thrown, it should return false.
* on_throw_sound (optional, there is a default sound, specify "" for no sound): sound to be played when the arrow is throw
* on_hit_fails(self, pos, thrower, data) (optional): callback function called if the hit failed (e.g. because on_hit returned false or because the area was protected)
]]
-- Example:
throwing.register_arrow("arrow", {
itemcraft = "default:steel_ingot",
craft_quantity = 16,
description = "Arrow",
tiles = {"throwing_arrow.png", "throwing_arrow.png", "throwing_arrow_back.png", "throwing_arrow_front.png", "throwing_arrow_2.png", "throwing_arrow.png"},
target = throwing.target_object,
on_hit_sound = "throwing_arrow",
on_hit = function(pos, _, _, object, hitter)
object:punch(hitter, 1, {
full_punch_interval = 1,
damage_groups = {fleshy = 3}
})
end
})
```
If the item to throw is an arrow registered using `minetest.register_arrow`, the entity used will be the registered entity.
Otherwise, if its definition contains a `throwing_entity` field, this field will be used as the entity name if it is a string, otherwise it will be called as a function(pos, player) that has to make the object to spawn and to return the corresponding ObjectRef.
If the item is neither an arrow nor has any `throwing_entity` field, the corresponding `__builtin:item` will be used.