134 lines
4.2 KiB
Lua
134 lines
4.2 KiB
Lua
-- NPC Chat code by Zorman2000
|
|
-- Chat system consists of chatline and options objects that are re-used to create a conversation.
|
|
-- The objects are the following:
|
|
--
|
|
-- chatline = { text = "", options = {}, name = "", flag = "" }
|
|
-- 1. text: What the NPC says on this chat line
|
|
-- 2. options: What the player can answer to the chat line. Options are of another type of chat lines.
|
|
-- If you want the player to have no options to answer, set to nil
|
|
-- 3. name: The name of the NPC that will use this line. Use this when you want a specific NPC
|
|
-- to speak this line.
|
|
-- 4. flag: When the NPC speaks this line, this flag will be set into the entity's metadata.
|
|
--
|
|
-- options = { opt = "", answer = { chatline }
|
|
-- 1. opt: The text that the player can say to the NPC
|
|
-- 2. answer: A chatline object (as described above)
|
|
--
|
|
-- Example of conversation hierarchy
|
|
-- chat_options = {
|
|
-- chatline1 = { text = "Q1", options = {
|
|
-- option1 = { opt = "O1", answer = {
|
|
-- chatline = { text = "A1", options = nil }
|
|
-- }
|
|
-- },
|
|
-- chatline2 = { text = "Q2", options = nil }
|
|
-- }
|
|
|
|
local options = {"Question 1","Question 2","Question 3","Question 4"}
|
|
|
|
---------------------------------------------------------------------
|
|
-- Creates a formspec for dialog
|
|
--------------------------------------------------------------------
|
|
local function create_formspec(options, close_option)
|
|
local options_length = table.getn(options) + 1
|
|
local formspec_height = (options_length * 0.7) + 1
|
|
local formspec = "size[7,"..tostring(formspec_height).."]"
|
|
for i, opt in ipairs(options) do
|
|
local y = 0.7;
|
|
if i > 1 then
|
|
y = (y * i)
|
|
end
|
|
formspec = formspec.."button[0.5,"..y..";6,0.5;opt"..tostring(i)..";"..options[i].opt.."]"
|
|
end
|
|
formspec = formspec.."button_exit[0.5,"..(formspec_height - 1)..";6,0.5;exit;"..close_option.."]"
|
|
return formspec
|
|
end
|
|
|
|
---------------------------------------------------------------------
|
|
-- Returns a random chatline for unimportant NPCs
|
|
---------------------------------------------------------------------
|
|
local function get_random_chatline(chat_options)
|
|
local chat_options_length = table.getn(chat_options)
|
|
local random_option = math.random(1, chat_options_length - 1)
|
|
local found = false
|
|
while found == false do
|
|
for i,chatline in ipairs(chat_options) do
|
|
if i == random_option and chatline.name == nil then
|
|
found = true
|
|
return chatline
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
---------------------------------------------------------------------
|
|
-- Returns all chatlines for a specific NPC
|
|
---------------------------------------------------------------------
|
|
local function get_chatline_for_npc(chat_options, npc_name)
|
|
local result = {}
|
|
for i,chatline in ipairs(chat_options) do
|
|
if chatline.name == npc_name then
|
|
table.insert(result, chatline)
|
|
end
|
|
end
|
|
return result
|
|
end
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- Functions for rotating NPC to look at player (taken from the API itself)
|
|
-----------------------------------------------------------------------------
|
|
local atan = function(x)
|
|
if x ~= x then
|
|
return 0
|
|
else
|
|
return math.atan(x)
|
|
end
|
|
end
|
|
|
|
|
|
local function rotate_npc_to_player(self)
|
|
local s = self.object:getpos()
|
|
local objs = minetest.get_objects_inside_radius(s, 4)
|
|
local lp = nil
|
|
local yaw = 0
|
|
|
|
for n = 1, #objs do
|
|
if objs[n]:is_player() then
|
|
lp = objs[n]:getpos()
|
|
break
|
|
end
|
|
end
|
|
if lp then
|
|
local vec = {
|
|
x = lp.x - s.x,
|
|
y = lp.y - s.y,
|
|
z = lp.z - s.z
|
|
}
|
|
|
|
yaw = (atan(vec.z / vec.x) + math.pi / 2) - self.rotate
|
|
|
|
if lp.x > s.x then
|
|
yaw = yaw + math.pi
|
|
end
|
|
end
|
|
self.object:setyaw(yaw)
|
|
end
|
|
|
|
---------------------------------------------------------------------
|
|
-- Drives conversation
|
|
---------------------------------------------------------------------
|
|
local function show_chat_option(npc_name, self, player_name, chat_options, close_option)
|
|
rotate_npc_to_player(self)
|
|
self.order = "stand"
|
|
|
|
local chatline = get_random_chatline(chat_options)
|
|
minetest.chat_send_player(player_name, chatline.text)
|
|
if chatline.options ~= nil then
|
|
minetest.log("Current options: "..dump(chatline.options))
|
|
local formspec = create_formspec(chatline.options, close_option)
|
|
minetest.show_formspec(player_name, "rndform", formspec)
|
|
end
|
|
|
|
self.order = "follow"
|
|
end
|