225 lines
6.2 KiB
Lua
225 lines
6.2 KiB
Lua
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--[[
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Copyright (C) 2016 - Auke Kok <sofar@foo-projects.org>
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"lightning" is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1
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of the license, or (at your option) any later version.
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--]]
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lightning = {}
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lightning.interval_low = 17
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lightning.interval_high = 503
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lightning.range_h = 100
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lightning.range_v = 50
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lightning.size = 100
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-- disable this to stop lightning mod from striking
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lightning.auto = true
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local rng = PcgRandom(32321123312123)
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local ps = {}
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local ttl = -1
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local revertsky = function(dtime)
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if ttl == 0 then
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return
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end
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ttl = ttl - dtime
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if ttl > 0 then
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return
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end
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mcl_weather.skycolor.remove_layer("lightning")
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ps = {}
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end
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minetest.register_globalstep(revertsky)
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-- select a random strike point, midpoint
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local function choose_pos(pos)
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if not pos then
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local playerlist = minetest.get_connected_players()
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local playercount = table.getn(playerlist)
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-- nobody on
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if playercount == 0 then
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return nil, nil
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end
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local r = rng:next(1, playercount)
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local randomplayer = playerlist[r]
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pos = randomplayer:get_pos()
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-- avoid striking underground
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if pos.y < -20 then
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return nil, nil
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end
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pos.x = math.floor(pos.x - (lightning.range_h / 2) + rng:next(1, lightning.range_h))
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pos.y = pos.y + (lightning.range_v / 2)
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pos.z = math.floor(pos.z - (lightning.range_h / 2) + rng:next(1, lightning.range_h))
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end
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local b, pos2 = minetest.line_of_sight(pos, {x = pos.x, y = pos.y - lightning.range_v, z = pos.z}, 1)
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-- nothing but air found
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if b then
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return nil, nil
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end
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local n = minetest.get_node({x = pos2.x, y = pos2.y - 1/2, z = pos2.z})
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if n.name == "air" or n.name == "ignore" then
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return nil, nil
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end
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return pos, pos2
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end
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-- lightning strike API
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-- * pos: optional, if not given a random pos will be chosen
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-- * returns: bool - success if a strike happened
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lightning.strike = function(pos)
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if lightning.auto then
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minetest.after(rng:next(lightning.interval_low, lightning.interval_high), lightning.strike)
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end
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local pos2
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pos, pos2 = choose_pos(pos)
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if not pos then
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return false
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end
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minetest.add_particlespawner({
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amount = 1,
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time = 0.2,
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-- make it hit the top of a block exactly with the bottom
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minpos = {x = pos2.x, y = pos2.y + (lightning.size / 2) + 1/2, z = pos2.z },
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maxpos = {x = pos2.x, y = pos2.y + (lightning.size / 2) + 1/2, z = pos2.z },
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minvel = {x = 0, y = 0, z = 0},
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maxvel = {x = 0, y = 0, z = 0},
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minacc = {x = 0, y = 0, z = 0},
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maxacc = {x = 0, y = 0, z = 0},
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minexptime = 0.2,
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maxexptime = 0.2,
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minsize = lightning.size * 10,
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maxsize = lightning.size * 10,
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collisiondetection = true,
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vertical = true,
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-- to make it appear hitting the node that will get set on fire, make sure
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-- to make the texture lightning bolt hit exactly in the middle of the
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-- texture (e.g. 127/128 on a 256x wide texture)
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texture = "lightning_lightning_" .. rng:next(1,3) .. ".png",
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})
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minetest.sound_play({ pos = pos, name = "lightning_thunder", gain = 10, max_hear_distance = 500 })
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-- damage nearby objects, player or not
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for _, obj in ipairs(minetest.get_objects_inside_radius(pos, 5)) do
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-- nil as param#1 is supposed to work, but core can't handle it.
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obj:punch(obj, 1.0, {full_punch_interval = 1.0, damage_groups = {fleshy=8}}, nil)
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end
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local playerlist = minetest.get_connected_players()
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for i = 1, #playerlist do
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local player = playerlist[i]
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local sky = {}
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sky.bgcolor, sky.type, sky.textures = player:get_sky()
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local name = player:get_player_name()
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if ps[name] == nil then
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ps[name] = {p = player, sky = sky}
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mcl_weather.skycolor.add_layer("lightning", {{r=255,g=255,b=255}}, true)
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mcl_weather.skycolor.active = true
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end
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end
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-- trigger revert of skybox
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ttl = 0.1
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-- Events caused by the lightning strike: Fire, damage, mob transformations, rare skeleton spawn
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pos2.y = pos2.y + 1/2
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local skeleton_lightning = false
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if rng:next(1,100) <= 3 then
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skeleton_lightning = true
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end
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if minetest.get_item_group(minetest.get_node({x = pos2.x, y = pos2.y - 1, z = pos2.z}).name, "liquid") < 1 then
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if minetest.get_node(pos2).name == "air" then
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-- Low chance for a lightning to spawn skeleton horse + skeletons
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if skeleton_lightning then
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minetest.add_entity(pos2, "mobs_mc:skeleton_horse")
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local angle, posadd
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angle = math.random(0, math.pi*2)
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for i=1,3 do
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posadd = {x=math.cos(angle),y=0,z=math.sin(angle)}
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posadd = vector.normalize(posadd)
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local mob = minetest.add_entity(vector.add(pos2, posadd), "mobs_mc:skeleton")
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mob:setyaw(angle-math.pi/2)
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angle = angle + (math.pi*2) / 3
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end
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-- Cause a fire, deal damage, transform mobs
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else
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minetest.set_node(pos2, {name = "mcl_fire:fire"})
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local objs = minetest.get_objects_inside_radius(pos2, 3.5)
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for o=1, #objs do
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local obj = objs[o]
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local lua = obj:get_luaentity()
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if obj:is_player() then
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-- Player damage
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if minetest.get_modpath("mcl_death_messages") then
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mcl_death_messages.player_damage(obj, string.format("%s was struck by lightning.", obj:get_player_name()))
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end
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obj:set_hp(obj:get_hp()-5)
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-- Mobs
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elseif lua and lua._cmi_is_mob then
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-- pig → zombie pigman
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if lua.name == "mobs_mc:pig" then
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local rot = obj:get_yaw()
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obj:remove()
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obj = minetest.add_entity(pos2, "mobs_mc:pigman")
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obj:set_yaw(rot)
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-- villager → witch
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elseif lua.name == "mobs_mc:villager" then
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-- Witches are incomplete, this code is unused
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-- TODO: Enable this code when witches are working.
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--[[
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local rot = obj:get_yaw()
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obj:remove()
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obj = minetest.add_entity(pos2, "mobs_mc:witch")
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obj:set_yaw(rot)
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]]
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-- TODO: creeper → charged creeper
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elseif lua.name == "mobs_mc:creeper" then
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-- Other mobs: Just Damage
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else
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obj:set_hp(obj:get_hp()-5)
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end
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end
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end
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end
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end
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-- TODO: Charged creeper
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end
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end
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-- if other mods disable auto lightning during initialization, don't trigger the first lightning.
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minetest.after(5, function(dtime)
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if lightning.auto then
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minetest.after(rng:next(lightning.interval_low,
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lightning.interval_high), lightning.strike)
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end
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end)
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