Gael-de-Sailly
/
minetest_modding_book
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Node Metadata: Improve phrasing/readability

master
Ezhh 2017-09-18 15:42:13 +01:00 committed by rubenwardy
parent ba6935b25e
commit d1594f25cb
1 changed files with 26 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
en/chapters/node_metadata.md
View File

@ -8,13 +8,13 @@ root: ../../
In this chapter you will learn how to manipulate a node's metadata.
* What is Node Metadata?
* Getting a Metadata Object
* Reading Metadata
* Setting Metadata
* Lua Tables
* Infotext
* Your Turn
* [What is Node Metadata?](#what-is-node-medadata)
* [Getting a Metadata Object](#getting-a-metadata-object)
* [Reading Metadata](#reading-metadata)
* [Setting Metadata](#setting-metadata)
* [Lua Tables](#lua-tables)
* [Infotext](#infotext)
* [Your Turn](#your-turn)
## What is Node Metadata?
@ -22,15 +22,14 @@ Metadata is data about data. So Node Metadata is **data about a node**.
You may use metadata to store:
* an node's inventory (such as in a chest).
* progress on crafting (such as in a furnace).
* who owns the node (such as in a locked chest).
* A node's inventory (such as in a chest).
* Progress on crafting (such as in a furnace).
* Who owns the node (such as the owner of a locked chest).
The node's type, light levels,
and orientation are not stored in the metadata, but rather are part
of the data itself.
The node's type, light levels, and orientation are not stored in the metadata.
These are part of the data itself.
Metadata is stored in a key value relationship.
Metadata is stored in a key value relationship. For example:
| Key | Value |
|---------|---------|
@ -40,7 +39,7 @@ Metadata is stored in a key value relationship.
## Getting a Metadata Object
Once you have a position of a node, you can do this:
If you know the position of a node, you can retrieve its metadata:
{% highlight lua %}
local meta = minetest.get_meta(pos)
@ -49,6 +48,8 @@ local meta = minetest.get_meta(pos)
## Reading Metadata
After retrieving the metadata, you can read its values:
{% highlight lua %}
local value = meta:get_string("key")
@ -61,15 +62,14 @@ else
end
{% endhighlight %}
Here are all the get functions you can use, as of writing:
The functions available include:
* get_string
* get_int
* get_float
* get_inventory
In order to do booleans, you should use `get_string` and `minetest.is_yes`:
To get booleans, you should use `get_string` and `minetest.is_yes`:
{% highlight lua %}
local value = minetest.is_yes(meta:get_string("key"))
@ -83,7 +83,7 @@ end
## Setting Metadata
Setting meta data works pretty much exactly the same way.
You can set node metadata. For example:
{% highlight lua %}
local value = "one"
@ -92,7 +92,7 @@ meta:set_string("key", value)
meta:set_string("foo", "bar")
{% endhighlight %}
Here are all the set functions you can use, as of writing:
This can be done using the following functions:
* set_string
* set_int
@ -110,15 +110,15 @@ meta:from_table(tmp)
## Infotext
The Minetest Engine reads the field `infotext` in order to make text
appear on mouse-over. This is used by furnaces to show progress and signs
to show their text.
The Minetest engine reads the field `infotext` to make text
appear on mouse-over. This is used by furnaces to show progress and by signs
to show their text. For example:
{% highlight lua %}
meta:set_string("infotext", "Here is some text that will appear on mouse over!")
meta:set_string("infotext", "Here is some text that will appear on mouse-over!")
{% endhighlight %}
## Your Turn
* Make a block which disappears after it has been punched 5 times.
(use on_punch in the node def and minetest.set_node)
* Make a node which disappears after it has been punched five times.
(Use `on_punch` in the node definition and `minetest.set_node`.)