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# Display API
This document describes Display API. Display API allows to add a dynamic display on a node. Display API limits node rotations. For wallmounted, only vertical positionning is available. For facedir, only first four position are availabel (those with default axis).
## Provided methods
### update\_entities
**display\_api.update\_entities(pos)**
This method triggers entities update for the display node at pos. Actual entity update is made by `on_display_update` callback associated to the entity.
`pos`: Position of the node
### register\_display\_entity
**display\_api.register\_display\_entity(entity_name)**
This is a helper to register entities used for display.
`entity_name`: Name of the entity to register.
## Provided callback implementations
### on_place
**display\_api.on\_place(itemstack, placer, pointed\_thing)**
`on_place` node callback implementation. Display nodes should have this callback (avoid placement of horizontal display node).
### on_construct
**display\_api.on\_construct(pos)**
`on_construct` node callback implementation. Display nodes should have this callback (creates, places and updates display entities on node construction).
### on_destruct
**display\_api.on_destruct(pos)**
`on_destruct` node callback implementation. Display nodes should have this callback (removes display entities on node destruction).
### on_rotate
**display\_api.on\_rotate(pos, node, user, mode, new_param2)**
`on_rotate` node callback implementation. Display nodes should have this callback (restricts rotations and rotates display entities associated with node).
### on_activate
**display\_api.on_activate(entity, staticdata)**
`On_activate` entity callback implementation for display entities. No need of this method if display entities have been registered using `register_display_entity` (callback is already set).
## Howto register a display node
* Register display entities with `register_display_entity`
* Register node with :
- `on_place`, `on_construct`, `on_destruct` and `on_rotate` callbacks using display_api callbacks.\
- `display_api` group. This will make this node have their entities updated as soon as the mapblock is loaded (Useful after /clearobjects).\
- a `display_entities` field in node definition containing a entity name indexed table. See below for description of each display_entities fields.\
### Display_entities fields
`on_display_update` is a callback in charge of setting up entity texture. If not set, entity will have no texture and will be displayed as unknown item.\
`depth`, `right` and `top`: Entity position regarding to node facedir/wallmounted main axis.\
Values for these fields can be any number between -1.5 and 1.5 (default value is 0). Position 0,0,0 is the center of the node.\
`depth` goes from front (-0.5) to rear (0.5), `top` goes from bottom (-0.5) to top (0.5) and `right` goes from left (-0.5) to right (0.5).\
`yaw`: Entity yaw in radians, regarding to main axis. Default is 0, aligned to node face.
In order to avoid flickering text, it's better to have text a little behind node surface. A good spacing value is given by `display_api.entity_spacing` variable.
### Example
display_api.register_display_entity("mymod:entity1")
display_api.register_display_entity("mymod:entity2")
function my_display_update1(pos, objref)
objref:set_properties({ textures= {"mytexture1.png"},
visual_size = {x=1, y=1} })
end
function my_display_update2(pos, objref)
objref:set_properties({ textures= {"mytexture2.png"},
                        visual_size = {x=1, y=1} })
end
minetest.register_node("mymod:test_display_node", {
...
paramtype2 = "facedir",
...
groups = { display_api = 1, ... },
...
display_entities = {
["mymod:entity1"] = {
depth = 0.3,
on_display_update = my_display_update1 },
["mymod:entity1"] = {
depth = 0.2, top = 0.1,
on_display_update = my_display_update2 },
},
...
on_place = display_api.on_place,
on_construct = display_api.on_construct,
on_destruct = display_api.on_destruct,
on_rotate = display_api.on_rotate,
...
})

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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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# Display API
This library's purpose is to ease creation of nodes with one or more displays on sides. For example, signs and clocks. Display can be dynamic and/or different for each node instance.
**Limitations**: This lib uses entities to draw display. This means display has to be vertical (and "upside up") on Minetest before version 5.0.
**Dependancies**:default
**License**: LGPLv2
**API**: See [API.md](https://github.com/pyrollo/display_modpack/blob/master/display_api/API.md) document please.
For more information, see the [forum topic](https://forum.minetest.net/viewtopic.php?t=19365) at the Minetest forums.
## Deprecation notice (for modders)
### December 2018
Following objects are deprecated, shows a warning in log when used:
* `display_modpack_node` group (use `display_api` group instead);
* `display_lib_node` group (use `display_api` group instead);
* `display_lib` global table (use `display_api` global table instead);
These objects will be removed in the future.
## Change log
### 2019-03-14
- __dispay_api__: Display API now detects automatically whenr rotation restrictions have to be applied.
### 2019-03-09
- __display_api__: Display nodes can be rotated in every directions (if running Minetest 5 or above).
- __display_api__: New setting to restrict rotations to Minetest 0.4 abilities (restriction enabled by default).
### 2018-12-14
- __display_api__: New `yaw` attributes, entities can now have different angles with node.

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Code by Pierre-Yves Rollo (pyrollo)
Contributors:
(gpcf): Compatibility with signs lib
(Thomas--S): Fix /clearobjects bug
(12Me21): on_place and on_rotate improvements

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--[[
display_api mod for Minetest - Library to add dynamic display
capabilities to nodes
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- Deprecation
function deprecated_group(deprecated_group, replacement_group)
for name, ndef in pairs(minetest.registered_nodes) do
if ndef.groups and ndef.groups[deprecated_group] then
minetest.log("warning", string.format(
'Node %s belongs to deprecated "%s" group which should be replaced with new "%s" group.',
name, deprecated_group, replacement_group))
end
end
end
function deprecated_global_table(deprecated_global_name, replacement_global_name)
assert(type(deprecated_global_name) == 'string', "deprecated_global_name should be a string.")
assert(type(replacement_global_name) == 'string', "replacement_global_name should be a string.")
assert(deprecated_global_name ~= '', "deprecated_global_name should not be empty.")
assert(replacement_global_name ~= '', "replacement_global_name should not be empty.")
assert(rawget(_G, deprecated_global_name) == nil, "deprecated global does not exist.")
if _G[replacement_global_name] == nil then
minetest.log('warning', string.format(
'Replacement global "%s" does not exists.', replacement_global_name))
return
end
local meta = {
deprecated = deprecated_global_name,
replacement = replacement_global_name,
__index = function(table, key)
local meta = getmetatable(table)
local dbg = debug.getinfo(2, "lS")
minetest.log("warning", string.format(
'Accessing deprecated "%s" table, "%s" should be used instead (%s:%d).',
meta.deprecated, meta.replacement, (dbg.short_src or 'unknown'),
(dbg.currentline or 0)))
return _G[meta.replacement][key]
end,
__newindex = function(table, key, value)
local meta = getmetatable(table)
local dbg = debug.getinfo(2, "lS")
minetest.log("warning", string.format(
'Accessing deprecated "%s" table, "%s" should be used instead (%s:%d).',
meta.deprecated, meta.replacement, (dbg.short_src or 'unknown'),
(dbg.currentline or 0)))
_G[meta.replacement][key]=value
end,
}
rawset(_G, deprecated_global_name, {})
setmetatable(_G[deprecated_global_name], meta)
end
-- deprecated(1) -- December 2018 - Deprecation of groups display_modpack_node and display_lib_node
-- Group to be removed from display API register_lbm
minetest.after(0, function()
deprecated_group("display_modpack_node", "display_api")
deprecated_group("display_lib_node", "display_api")
end)
-- deprecated(2) -- December 2018 - Deprecation of display_lib
deprecated_global_table('display_lib', 'display_api')

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--[[
display_api mod for Minetest - Library to add dynamic display
capabilities to nodes
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- Prefered gap between node and entity
-- Entity positionment is up to mods but it is a good practice to use this
-- variable as spacing between entity and node
display_api.entity_spacing = 0.002
-- Maximum entity position relative to the node pos
local max_entity_pos = 1.5
local wallmounted_rotations = {
[0]={x=1, y=0, z=0}, [1]={x=3, y=0, z=0},
[2]={x=0, y=3, z=0}, [3]={x=0, y=1, z=0},
[4]={x=0, y=0, z=0}, [5]={x=0, y=2, z=0},
[6]={x=1, y=0, z=0}, [7]={x=1, y=1, z=1},
}
local facedir_rotations = {
[ 0]={x=0, y=0, z=0}, [ 1]={x=0, y=3, z=0},
[ 2]={x=0, y=2, z=0}, [ 3]={x=0, y=1, z=0},
[ 4]={x=3, y=0, z=0}, [ 5]={x=0, y=3, z=3},
[ 6]={x=1, y=0, z=2}, [ 7]={x=0, y=1, z=1},
[ 8]={x=1, y=0, z=0}, [ 9]={x=0, y=3, z=1},
[10]={x=3, y=0, z=2}, [11]={x=0, y=1, z=3},
[12]={x=0, y=0, z=1}, [13]={x=3, y=0, z=1},
[14]={x=2, y=0, z=1}, [15]={x=1, y=0, z=1},
[16]={x=0, y=0, z=3}, [17]={x=1, y=0, z=3},
[18]={x=2, y=0, z=3}, [19]={x=3, y=0, z=3},
[20]={x=0, y=0, z=2}, [21]={x=0, y=1, z=2},
[22]={x=0, y=2, z=2}, [23]={x=0, y=3, z=2},
}
-- Compute other useful values depending on wallmounted and facedir param
local wallmounted_values = {}
local facedir_values = {}
local function compute_values(r)
local function rx(v) return { x=v.x, y=v.z, z=-v.y} end
local function ry(v) return { x=-v.z, y=v.y, z=v.x} end
local function rz(v) return { x=v.y, y=-v.x, z=v.z} end
local d = { x = 0, y = 0, z = 1 }
local w = { x = 1, y = 0, z = 0 }
local h = { x = 0, y = 1, z = 0 }
-- Important to keep z rotation first (not same results)
for _ = 1, r.z do d, w, h = rz(d), rz(w), rz(h) end
for _ = 1, r.x do d, w, h = rx(d), rx(w), rx(h) end
for _ = 1, r.y do d, w, h = ry(d), ry(w), ry(h) end
return {
rotation=r, depth=d, width=w, height=h,
restricted=(r.x==0 and r.z==0) }
end
for i, r in pairs(facedir_rotations) do
facedir_values[i] = compute_values(r)
end
for i, r in pairs(wallmounted_rotations) do
wallmounted_values[i] = compute_values(r)
end
-- Detect rotation restriction
local rotation_restricted = nil
minetest.register_entity('display_api:dummy_entity', {
collisionbox = { 0, 0, 0, 0, 0, 0 },
visual = "upright_sprite",
textures = {} })
function display_api.is_rotation_restricted()
if rotation_restricted == nil then
local objref = minetest.add_entity(
{x=0, y=0, z=0}, 'display_api:dummy_entity')
if objref then
rotation_restricted = objref.set_rotation == nil
objref:remove()
end
end
return rotation_restricted
end
-- Clip position property to maximum entity position
local function clip_pos_prop(posprop)
if posprop then
return math.max(-max_entity_pos, math.min(max_entity_pos, posprop))
else
return 0
end
end
-- Get values needed for orientation computation of node
local function get_orientation_values(node)
local ndef = minetest.registered_nodes[node.name]
if ndef then
local paramtype2 = ndef.paramtype2
if paramtype2 == "wallmounted" or paramtype2 == "colorwallmounted" then
return wallmounted_values[node.param2 % 8]
elseif paramtype2 == "facedir" or paramtype2 == "colorfacedir" then
return facedir_values[node.param2 % 32]
else
-- No orientation or unknown orientation type
return facedir_values[0]
end
end
end
-- Gets the display entities attached with a node.
-- Add missing and remove duplicates
local function get_display_objrefs(pos, create)
local objrefs = {}
local ndef = minetest.registered_nodes[minetest.get_node(pos).name]
if ndef and ndef.display_entities then
for _, objref in
ipairs(minetest.get_objects_inside_radius(pos, max_entity_pos)) do
local entity = objref:get_luaentity()
if entity and ndef.display_entities[entity.name] and
entity.nodepos and vector.equals(pos, entity.nodepos) then
if objrefs[entity.name] then
objref:remove() -- Remove duplicates
else
objrefs[entity.name] = objref
end
end
end
if create then
-- Add missing
for name, _ in pairs(ndef.display_entities) do
if not objrefs[name] then
objrefs[name] = minetest.add_entity(pos, name,
minetest.serialize({ nodepos = pos }))
end
end
end
end
return objrefs
end
--- Force entity update : position and texture
function display_api.update_entities(pos)
local node = minetest.get_node(pos)
local ndef = minetest.registered_nodes[node.name]
local ov = get_orientation_values(node)
if not ndef or not ov then
return
end
for _, objref in pairs(get_display_objrefs(pos, true)) do
local edef = ndef.display_entities[objref:get_luaentity().name]
local depth = clip_pos_prop(edef.depth)
local right = clip_pos_prop(edef.right)
local top = clip_pos_prop(edef.top)
objref:set_pos({
x = pos.x + ov.depth.x*depth + ov.width.x*right - ov.height.x*top,
y = pos.y + ov.depth.y*depth + ov.width.y*right - ov.height.y*top,
z = pos.z + ov.depth.z*depth + ov.width.z*right - ov.height.z*top,
})
if objref.set_rotation then
objref:set_rotation({
x = ov.rotation.x*math.pi/2,
y = ov.rotation.y*math.pi/2 + (edef.yaw or 0),
z = ov.rotation.z*math.pi/2,
})
else
if ov.rotation.x ~=0 or ov.rotation.y ~= 0 then
minetest.log("warning", string.format(
"[display_api] unable to rotate correctly entity for node at %s without set_rotation method.",
minetest.pos_to_string(pos)))
end
objref:set_yaw(ov.rotation.y*math.pi/2 + (edef.yaw or 0))
end
-- Call on_display_update callback of a node for one of its display entities
if edef.on_display_update then
edef.on_display_update(pos, objref)
end
end
end
--- On_activate callback for display_api entities. Calls on_display_update callbacks
--- of corresponding node for each entity.
function display_api.on_activate(entity, staticdata)
if entity then
if string.sub(staticdata, 1, string.len("return")) == "return" then
local data = minetest.deserialize(staticdata)
if data and type(data) == "table" then
entity.nodepos = data.nodepos
end
entity.object:set_armor_groups({immortal=1})
end
if entity.nodepos then
local node = minetest.get_node(entity.nodepos)
local ndef = minetest.registered_nodes[node.name]
if ndef and ndef.display_entities then
local edef = ndef.display_entities[entity.name]
if edef then
-- Call on_display_update callback of the entity to build texture
if edef.on_display_update then
edef.on_display_update(entity.nodepos, entity.object)
end
return
end
end
end
-- If we got here, this display entity is buggy and should be removed
entity.object:remove()
end
end
--- On_place callback for display_api items.
-- Does nothing more than preventing node from being placed on ceiling or ground
-- TODO:When MT<5 is not in use anymore, simplify this
function display_api.on_place(itemstack, placer, pointed_thing, override_param2)
local ndef = itemstack:get_definition()
local dir = {
x = pointed_thing.under.x - pointed_thing.above.x,
y = pointed_thing.under.y - pointed_thing.above.y,
z = pointed_thing.under.z - pointed_thing.above.z,
}
local rotation_restriction = display_api.is_rotation_restricted()
if rotation_restriction then
-- If item is not placed on a wall, use the player's view direction instead
if dir.x == 0 and dir.z == 0 then
dir = placer:get_look_dir()
end
dir.y = 0
end
local param2 = 0
if ndef then
if ndef.paramtype2 == "wallmounted" or
ndef.paramtype2 == "colorwallmounted" then
param2 = minetest.dir_to_wallmounted(dir)
elseif ndef.paramtype2 == "facedir" or
ndef.paramtype2 == "colorfacedir" then
param2 = minetest.dir_to_facedir(dir, not rotation_restriction)
end
end
return minetest.item_place(itemstack, placer, pointed_thing,
param2 + (override_param2 or 0))
end
--- On_construct callback for display_api items.
-- Creates entities and update them.
function display_api.on_construct(pos)
display_api.update_entities(pos)
end
--- On_destruct callback for display_api items.
-- Removes entities.
function display_api.on_destruct(pos)
for _, objref in pairs(get_display_objrefs(pos)) do
objref:remove()
end
end
-- On_rotate (screwdriver) callback for display_api items. Prevents invalid
-- rotations and reorients entities.
function display_api.on_rotate(pos, node, user, _, new_param2)
node.param2 = new_param2
local ov = get_orientation_values(node)
if not ov then
return
end
if ov.restricted or not display_api.is_rotation_restricted() then
minetest.swap_node(pos, node)
display_api.update_entities(pos)
return true
else
return false
end
end
--- Creates display entity with some fields and the on_activate callback
function display_api.register_display_entity(entity_name)
if not minetest.registered_entities[entity_name] then
minetest.register_entity(':'..entity_name, {
collisionbox = { 0, 0, 0, 0, 0, 0 },
visual = "upright_sprite",
textures = {},
on_activate = display_api.on_activate,
get_staticdata = function(self)
return minetest.serialize({ nodepos = self.nodepos })
end,
})
end
end
minetest.register_lbm({
label = "Update display_api entities",
name = "display_api:update_entities",
run_at_every_load = true,
nodenames = {"group:display_api",
"group:display_modpack_node", "group:display_lib_node"}, -- See deprecated(1)
action = function(pos, node) display_api.update_entities(pos) end,
})

31
display_api/init.lua Normal file
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--[[
display_api mod for Minetest - Library to add dynamic display
capabilities to nodes
(c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
--]]
-- Global variables
-------------------
display_api = {}
display_api.name = minetest.get_current_modname()
display_api.path = minetest.get_modpath(display_api.name)
-- Inclusions
-------------
dofile(display_api.path.."/display.lua")
dofile(display_api.path.."/deprecation.lua")

2
display_api/mod.conf Normal file
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name=display_api
description=A library for adding dynamic textures on nodes