Place a block with LUA

[webdesigner97]

Hello,
I'd like to place a block with the API. I read, that i need something like set_node(). But what do the params of set_node look like? The block is a nodebox, so it needs to "facedir".
Here's all code i currently have:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

(..)
on_place = function ()
   
    end


[PilzAdam]

https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt
http://dev.minetest.net/Main_Page
Sorry, but first look for yourself.

[webdesigner97]

Well, i had some trouble the the add_node() function. But now I found an explanation at the Developer Wiki. Thanks Adam! :)

[webdesigner97]

Well, but i crashes:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

on_place = function (pos)
        pos.y = pos.y+1;
        minetest.env:add_node(pos, {name="streets:pole"})
    end


Message:

ServerError: LuaError: error: ...t-0.4.4-win32\bin\..\mods\minetest\streets/nodes.lua:231: attempt to perform arithmetic on field 'y' (a nil value)

Why is "pos.y" a nil value?

[PilzAdam]

Your parameter for on_place are wrong: https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt#L1391

[webdesigner97]

Your parameter for on_place are wrong: https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt#L1391

Thanks :)

[webdesigner97]

Finally it works:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

on_place = function (itemstack, placer, pointed_thing)
        if pointed_thing.type == "node" then
            local pos = pointed_thing.above
            minetest.env:add_node(pos, {name="streets:pole"})
            pos.y = pos.y+1
            minetest.env:add_node(pos, {name="streets:pole"})
        end
    end


[webdesigner97]

How can i access the inventory of the placer? The dev wiki says

get_size("listname")

My code:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

local inventory =  placer:get_inventory()
print(inventory.get_size("main"))


Error:

bad argument #1 to "get_size" userdata expected, got string

o.O

[jin_xi]

use inventory:get_size("main"). note the :

[kaeza]

From the Lua Manual (section 2.5.8 Function Calls):

A call v:name(args) is syntactic sugar for v.name(v,args), except that v is evaluated only once.

[webdesigner97]

use inventory:get_size("main"). note the :

Thanks, now it works..... The worst errors are only the little ones you can't see :D

[webdesigner97]

But why does

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

function (itemstack, placer, pointed_thing)
     (...)
     itemstack:take_item(1)
end


not work?

[webdesigner97]

But why does

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

function (itemstack, placer, pointed_thing)
     (...)
     itemstack:take_item(1)
end


not work?

Found out:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

function (itemstack, placer, pointed_thing)
     (...)
     itemstack:take_item(1)
     return itemstack
end