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add basic lightning API

This commit is contained in:
NO11 2021-09-09 09:22:27 +00:00 committed by Gitea
parent e9437e9e1e
commit 8e3f9d2169
1 changed files with 46 additions and 29 deletions

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@ -24,13 +24,14 @@ local get_objects_inside_radius = minetest.get_objects_inside_radius
local get_item_group = minetest.get_item_group
lightning = {
interval_low = 17,
interval_high = 503,
range_h = 100,
range_v = 50,
size = 100,
-- disable this to stop lightning mod from striking
auto = true,
interval_low = 17,
interval_high = 503,
range_h = 100,
range_v = 50,
size = 100,
-- disable this to stop lightning mod from striking
auto = true,
on_strike_functions = {},
}
local rng = PcgRandom(32321123312123)
@ -54,6 +55,18 @@ end
minetest.register_globalstep(revertsky)
-- lightning strike API
-- See README.md
--[[
lightning.register_on_strike(function(pos, pos2, objects)
-- code
end)
]]
function lightning.register_on_strike(func)
table.insert(lightning.on_strike_functions, func)
end
-- select a random strike point, midpoint
local function choose_pos(pos)
if not pos then
@ -79,14 +92,14 @@ local function choose_pos(pos)
pos.z = math.floor(pos.z - (lightning.range_h / 2) + rng:next(1, lightning.range_h))
end
local b, pos2 = line_of_sight(pos, {x = pos.x, y = pos.y - lightning.range_v, z = pos.z}, 1)
local b, pos2 = line_of_sight(pos, { x = pos.x, y = pos.y - lightning.range_v, z = pos.z }, 1)
-- nothing but air found
if b then
return nil, nil
end
local n = get_node({x = pos2.x, y = pos2.y - 1/2, z = pos2.z})
local n = get_node({ x = pos2.x, y = pos2.y - 1/2, z = pos2.z })
if n.name == "air" or n.name == "ignore" then
return nil, nil
end
@ -94,7 +107,6 @@ local function choose_pos(pos)
return pos, pos2
end
-- lightning strike API
-- * pos: optional, if not given a random pos will be chosen
-- * returns: bool - success if a strike happened
function lightning.strike(pos)
@ -108,21 +120,30 @@ function lightning.strike(pos)
if not pos then
return false
end
local objects = get_objects_inside_radius(pos2, 3.5)
if lightning.on_strike_functions then
for _, func in pairs(lightning.on_strike_functions) do
func(pos, pos2, objects)
end
end
end
lightning.register_on_strike(function(pos, pos2, objects)
local particle_pos = vector.offset(pos2, 0, (lightning.size / 2) + 0.5, 0)
local particle_size = lightning.size * 10
local time = 0.2
add_particlespawner({
amount = 1,
time = 0.2,
time = time,
-- make it hit the top of a block exactly with the bottom
minpos = {x = pos2.x, y = pos2.y + (lightning.size / 2) + 1/2, z = pos2.z },
maxpos = {x = pos2.x, y = pos2.y + (lightning.size / 2) + 1/2, z = pos2.z },
minvel = {x = 0, y = 0, z = 0},
maxvel = {x = 0, y = 0, z = 0},
minacc = {x = 0, y = 0, z = 0},
maxacc = {x = 0, y = 0, z = 0},
minexptime = 0.2,
maxexptime = 0.2,
minsize = lightning.size * 10,
maxsize = lightning.size * 10,
minpos = particle_pos,
maxpos = particle_pos,
minexptime = time,
maxexptime = time,
minsize = particle_size,
maxsize = particle_size,
collisiondetection = true,
vertical = true,
-- to make it appear hitting the node that will get set on fire, make sure
@ -135,10 +156,7 @@ function lightning.strike(pos)
sound_play({ name = "lightning_thunder", gain = 10 }, { pos = pos, max_hear_distance = 500 }, true)
-- damage nearby objects, transform mobs
-- TODO: use an API insteed of hardcoding this behaviour
local objs = get_objects_inside_radius(pos2, 3.5)
for o=1, #objs do
local obj = objs[o]
for _, obj in pairs(objects) do
local lua = obj:get_luaentity()
-- pig → zombie pigman (no damage)
if lua and lua.name == "mobs_mc:pig" then
@ -155,7 +173,7 @@ function lightning.strike(pos)
end
obj:set_properties({textures = lua.base_texture})
-- villager → witch (no damage)
--elseif lua and lua.name == "mobs_mc:villager" then
-- elseif lua and lua.name == "mobs_mc:villager" then
-- Witches are incomplete, this code is unused
-- TODO: Enable this code when witches are working.
--[[
@ -172,7 +190,7 @@ function lightning.strike(pos)
obj:set_yaw(rot)
-- Other objects: Just damage
else
mcl_util.deal_damage(obj, 5, {type = "lightning_bolt"})
mcl_util.deal_damage(obj, 5, { type = "lightning_bolt" })
end
end
@ -223,8 +241,7 @@ function lightning.strike(pos)
end
end
end
end
end)
-- if other mods disable auto lightning during initialization, don't trigger the first lightning.
after(5, function(dtime)