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Pierre-Yves Rollo 2018-12-09 17:24:46 +01:00
commit b3c935768f
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22
API.md
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@ -11,7 +11,7 @@ This method triggers entities update for the display node at pos. Actual entity
### register\_display\_entity ### register\_display\_entity
**display\_lib.register\_display\_entity(entity_name)** **display\_lib.register\_display\_entity(entity_name)**
This is a helper to register entities used for display. This is a helper to register entities used for display.
`entity_name`: Name of the entity to register. `entity_name`: Name of the entity to register.
## Provided callback implementations ## Provided callback implementations
@ -26,7 +26,7 @@ This is a helper to register entities used for display.
### on_destruct ### on_destruct
**display\_lib.on_destruct(pos)** **display\_lib.on_destruct(pos)**
`on_destruct` node callback implementation. Display nodes should have this callback (removes display entities on node destruction). `on_destruct` node callback implementation. Display nodes should have this callback (removes display entities on node destruction).
### on_rotate ### on_rotate
**display\_lib.on\_rotate(pos, node, user, mode, new_param2)** **display\_lib.on\_rotate(pos, node, user, mode, new_param2)**
@ -34,22 +34,20 @@ This is a helper to register entities used for display.
### on_activate ### on_activate
**display\_lib.on_activate(entity, staticdata)** **display\_lib.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). `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 ## Howto register a display node
* Register display entities with `register_display_entity` * Register display entities with `register_display_entity`
* Register node with : * Register node with :
- `on_place`, `on_construct`, `on_destruct` and `on_rotate` callbacks using display_api callbacks. - `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).
- `display_modpack_node` 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. - 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 ### 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. `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 `height` : Entity position regarding to node facedir/wallmounted main axis. `depth`, `right` and `height`: 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). 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. Position 0,0,0 is the center of the node.
`depth` goes from front (-0.5) to rear (0.5), `height` goes from bottom (-0.5) to top (0.5) and `right` goes from left (-0.5) to right (0.5). `depth` goes from front (-0.5) to rear (0.5), `height` goes from bottom (-0.5) to top (0.5) and `right` goes from left (-0.5) to right (0.5).
@ -61,12 +59,12 @@ In order to avoid flickering text, it's better to have text a little behind node
display_api.register_display_entity("mymod:entity1") display_api.register_display_entity("mymod:entity1")
display_api.register_display_entity("mymod:entity2") display_api.register_display_entity("mymod:entity2")
function my_display_update1(pos, objref) function my_display_update1(pos, objref)
objref:set_properties({ textures= {"mytexture1.png"}, objref:set_properties({ textures= {"mytexture1.png"},
visual_size = {x=1, y=1} }) visual_size = {x=1, y=1} })
end end
function my_display_update2(pos, objref) function my_display_update2(pos, objref)
objref:set_properties({ textures= {"mytexture2.png"}, objref:set_properties({ textures= {"mytexture2.png"},
                        visual_size = {x=1, y=1} })                         visual_size = {x=1, y=1} })
end end
@ -75,13 +73,13 @@ In order to avoid flickering text, it's better to have text a little behind node
... ...
paramtype2 = "facedir", paramtype2 = "facedir",
... ...
groups = { display_modpack_node = 1, ... }, groups = { display_api = 1, ... },
... ...
display_entities = { display_entities = {
["mymod:entity1"] = { ["mymod:entity1"] = {
depth = 0.3, depth = 0.3,
on_display_update = my_display_update1 }, on_display_update = my_display_update1 },
["mymod:entity1"] = { ["mymod:entity1"] = {
depth = 0.2, height = 0.1, depth = 0.2, height = 0.1,
on_display_update = my_display_update2 }, on_display_update = my_display_update2 },
}, },

72
deprecation.lua Normal file
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@ -0,0 +1,72 @@
--[[
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, "replacement global already exists.")
if _G[replacement_global_name] == nil then
print('warn_deprecated_functions: Warning, replacement global "'..replacement_global_name..'" does not exists.')
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('Warning: 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('Warning: 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')

239
display.lua Normal file
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@ -0,0 +1,239 @@
--[[
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
-- Miscelaneous values depending on wallmounted param2
local wallmounted_values = {
[2]={dx=-1, dz=0, rx=0, rz=-1, yaw=-math.pi/2},
[3]={dx=1, dz=0, rx=0, rz=1, yaw=math.pi/2 },
[4]={dx=0, dz=-1, rx=1, rz=0, yaw=0 },
[5]={dx=0, dz=1, rx=-1, rz=0, yaw=math.pi }
}
-- Miscelaneous values depending on facedir param2
local facedir_values = {
[0]={dx=0, dz=-1, rx=1, rz=0, yaw=0 },
[1]={dx=-1, dz=0, rx=0, rz=-1, yaw=-math.pi/2},
[2]={dx=0, dz=1, rx=-1, rz=0, yaw=math.pi },
[3]={dx=1, dz=0, rx=0, rz=1, yaw=math.pi/2 }
}
-- dx/dy = depth vector, rx/ly = right vector, yaw = yaw of entity,
local function get_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]
end
end
end
--- Gets the display entities attached with a node. Removes extra ones
local function get_entities(pos)
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
end
return objrefs
end
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
--- (Create and) place display entities according to the node orientation
local function place_entities(pos)
local node = minetest.get_node(pos)
local ndef = minetest.registered_nodes[node.name]
local values = get_values(node)
local objrefs = get_entities(pos)
if values and ndef and ndef.display_entities then
for entity_name, props in pairs(ndef.display_entities) do
local depth = clip_pos_prop(props.depth)
local right = clip_pos_prop(props.right)
local top = clip_pos_prop(props.top)
if not objrefs[entity_name] then
objrefs[entity_name] = minetest.add_entity(pos, entity_name,
minetest.serialize({ nodepos = pos }))
end
objrefs[entity_name]:setpos({
x = pos.x - values.dx * depth + values.rx * right,
y = pos.y - top,
z = pos.z - values.dz * depth + values.rz * right})
objrefs[entity_name]:setyaw(values.yaw)
end
end
return objrefs
end
--- Entity update
function update_entity(entity)
if not entity then
return
end
if not entity.nodepos then
entity.object:remove() -- Remove old/buggy entity
return
end
local node = minetest.get_node(entity.nodepos)
local ndef = minetest.registered_nodes[node.name]
if ndef and ndef.display_entities and
ndef.display_entities[entity.name] and
ndef.display_entities[entity.name].on_display_update
then
-- Call on_display_update callback of a node for one of its display entities
ndef.display_entities[entity.name].on_display_update(entity.nodepos,
entity.object)
else
-- Display node has been removed, remove entity also
entity.object:remove()
end
end
--- Force entity update
function display_api.update_entities(pos)
for _, objref in pairs(place_entities(pos)) do
update_entity(objref:get_luaentity())
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
update_entity(entity)
end
end
--- On_place callback for display_api items.
-- Does nothing more than preventing node from being placed on ceiling or ground
function display_api.on_place(itemstack, placer, pointed_thing, override_param2)
local ndef = itemstack:get_definition()
local above = pointed_thing.above
local under = pointed_thing.under
local dir = {x = under.x - above.x, y = 0, z = under.z - above.z}
-- 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()
dir.y = 0
end
local param2 = 0
if ndef then
local paramtype2 = ndef.paramtype2
if paramtype2 == "wallmounted" or paramtype2 == "colorwallmounted" then
param2 = minetest.dir_to_wallmounted(dir)
elseif paramtype2 == "facedir" or paramtype2 == "colorfacedir" then
param2 = minetest.dir_to_facedir(dir)
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_entities(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
if get_values(node) then
minetest.swap_node(pos, node)
place_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,
})

253
init.lua
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@ -1,240 +1,31 @@
--[[ --[[
display_api mod for Minetest - Library to add dynamic display display_api mod for Minetest - Library to add dynamic display
capabilities to nodes capabilities to nodes
(c) Pierre-Yves Rollo (c) Pierre-Yves Rollo
This program is free software: you can redistribute it and/or modify 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 it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or the Free Software Foundation, either version 3 of the License, or
(at your option) any later version. (at your option) any later version.
This program is distributed in the hope that it will be useful, This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details. GNU General Public License for more details.
You should have received a copy of the GNU General Public License You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. along with this program. If not, see <http://www.gnu.org/licenses/>.
--]] --]]
-- Global variables
-------------------
display_api = {} display_api = {}
display_api.name = minetest.get_current_modname()
display_api.path = minetest.get_modpath(display_api.name)
-- Prefered gap between node and entity -- Inclusions
-- 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 dofile(display_api.path.."/display.lua")
local max_entity_pos = 1.5 dofile(display_api.path.."/deprecation.lua")
-- Miscelaneous values depending on wallmounted param2
local wallmounted_values = {
[2]={dx=-1, dz=0, rx=0, rz=-1, yaw=-math.pi/2},
[3]={dx=1, dz=0, rx=0, rz=1, yaw=math.pi/2 },
[4]={dx=0, dz=-1, rx=1, rz=0, yaw=0 },
[5]={dx=0, dz=1, rx=-1, rz=0, yaw=math.pi }
}
-- Miscelaneous values depending on facedir param2
local facedir_values = {
[0]={dx=0, dz=-1, rx=1, rz=0, yaw=0 },
[1]={dx=-1, dz=0, rx=0, rz=-1, yaw=-math.pi/2},
[2]={dx=0, dz=1, rx=-1, rz=0, yaw=math.pi },
[3]={dx=1, dz=0, rx=0, rz=1, yaw=math.pi/2 }
}
-- dx/dy = depth vector, rx/ly = right vector, yaw = yaw of entity,
local function get_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]
end
end
end
--- Gets the display entities attached with a node. Removes extra ones
local function get_entities(pos)
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
end
return objrefs
end
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
--- (Create and) place display entities according to the node orientation
local function place_entities(pos)
local node = minetest.get_node(pos)
local ndef = minetest.registered_nodes[node.name]
local values = get_values(node)
local objrefs = get_entities(pos)
if values and ndef and ndef.display_entities then
for entity_name, props in pairs(ndef.display_entities) do
local depth = clip_pos_prop(props.depth)
local right = clip_pos_prop(props.right)
local top = clip_pos_prop(props.top)
if not objrefs[entity_name] then
objrefs[entity_name] = minetest.add_entity(pos, entity_name,
minetest.serialize({ nodepos = pos }))
end
objrefs[entity_name]:setpos({
x = pos.x - values.dx * depth + values.rx * right,
y = pos.y - top,
z = pos.z - values.dz * depth + values.rz * right})
objrefs[entity_name]:setyaw(values.yaw)
end
end
return objrefs
end
--- Entity update
function update_entity(entity)
if not entity then
return
end
if not entity.nodepos then
entity.object:remove() -- Remove old/buggy entity
return
end
local node = minetest.get_node(entity.nodepos)
local ndef = minetest.registered_nodes[node.name]
if ndef and ndef.display_entities and
ndef.display_entities[entity.name] and
ndef.display_entities[entity.name].on_display_update
then
-- Call on_display_update callback of a node for one of its display entities
ndef.display_entities[entity.name].on_display_update(entity.nodepos,
entity.object)
end
end
--- Force entity update
function display_api.update_entities(pos)
for _, objref in pairs(place_entities(pos)) do
update_entity(objref:get_luaentity())
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
update_entity(entity)
end
end
--- On_place callback for display_api items.
-- Does nothing more than preventing node from being placed on ceiling or ground
function display_api.on_place(itemstack, placer, pointed_thing, override_param2)
local ndef = itemstack:get_definition()
local above = pointed_thing.above
local under = pointed_thing.under
local dir = {x = under.x - above.x, y = 0, z = under.z - above.z}
-- 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()
dir.y = 0
end
local param2 = 0
if ndef then
local paramtype2 = ndef.paramtype2
if paramtype2 == "wallmounted" or paramtype2 == "colorwallmounted" then
param2 = minetest.dir_to_wallmounted(dir)
elseif paramtype2 == "facedir" or paramtype2 == "colorfacedir" then
param2 = minetest.dir_to_facedir(dir)
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_entities(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
if get_values(node) then
minetest.swap_node(pos, node)
place_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_entity 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_modpack_node", "group:display_lib_node"},
action = function(pos, node) display_api.update_entities(pos) end,
})
-- Compatibility
display_lib = display_api