musttest_game/mods/throwing/fireworks_arrows.lua

local function throwing_register_fireworks(color, desc)
	minetest.register_craftitem("throwing:arrow_fireworks_" .. color, {
		description = desc .. " Fireworks Arrow",
		inventory_image = "throwing_arrow_fireworks_" .. color .. ".png",
	})
	
	minetest.register_node("throwing:arrow_fireworks_" .. color .. "_box", {
		drawtype = "nodebox",
		node_box = {
			type = "fixed",
			fixed = {
				-- Shaft
				{-6.5/17, -1.5/17, -1.5/17, 6.5/17, 1.5/17, 1.5/17},
				--Spitze
				{-4.5/17, 2.5/17, 2.5/17, -3.5/17, -2.5/17, -2.5/17},
				{-8.5/17, 0.5/17, 0.5/17, -6.5/17, -0.5/17, -0.5/17},
				--Federn
				{6.5/17, 1.5/17, 1.5/17, 7.5/17, 2.5/17, 2.5/17},
				{7.5/17, -2.5/17, 2.5/17, 6.5/17, -1.5/17, 1.5/17},
				{7.5/17, 2.5/17, -2.5/17, 6.5/17, 1.5/17, -1.5/17},
				{6.5/17, -1.5/17, -1.5/17, 7.5/17, -2.5/17, -2.5/17},
				
				{7.5/17, 2.5/17, 2.5/17, 8.5/17, 3.5/17, 3.5/17},
				{8.5/17, -3.5/17, 3.5/17, 7.5/17, -2.5/17, 2.5/17},
				{8.5/17, 3.5/17, -3.5/17, 7.5/17, 2.5/17, -2.5/17},
				{7.5/17, -2.5/17, -2.5/17, 8.5/17, -3.5/17, -3.5/17},
			}
		},
		tiles = {"throwing_arrow_fireworks_" .. color .. ".png", "throwing_arrow_fireworks_" .. color .. ".png", "throwing_arrow_fireworks_" .. color .. "_back.png", "throwing_arrow_fireworks_" .. color .. "_front.png", "throwing_arrow_fireworks_" .. color .. "_2.png", "throwing_arrow_fireworks_" .. color .. ".png"},
		groups = {not_in_creative_inventory=1},
	})
	
	local THROWING_ARROW_ENTITY={
		_name = "throwing:arrow_fireworks_" .. color,
		physical = false,
		timer=0,
		visual = "wielditem",
		visual_size = {x=0.1, y=0.1},
		textures = {"throwing:arrow_fireworks_" .. color .. "_box"},
		lastpos={},
		collisionbox = {0,0,0,0,0,0},
		static_save = false,
	}
	
	local radius = 0.5
	
	local function add_effects(pos, radius)
		minetest.add_particlespawner({
			amount = 256,
			time = 0.2,
			minpos = vector.subtract(pos, radius / 2),
			maxpos = vector.add(pos, radius / 2),
			minvel = {x=-5, y=-5, z=-5},
			maxvel = {x=5,  y=5,  z=5},
			minacc = {x=0, y=-8, z=0},
			--~ maxacc = {x=-20, y=-50, z=-50},
			minexptime = 2.5,
			maxexptime = 3,
			minsize = 1,
			maxsize = 2.5,
			texture = "throwing_sparkle_" .. color .. ".png",
			glow = 14,
		})
	end
	
	
	local function boom(pos)
		minetest.sound_play("throwing_firework_boom", {pos=pos, gain=1, max_hear_distance=2*64}, true)
		if minetest.get_node(pos).name == 'air' or minetest.get_node(pos).name == 'throwing:firework_trail' then
			minetest.add_node(pos, {name="throwing:firework_boom"})
			minetest.get_node_timer(pos):start(0.2)
		end
		add_effects(pos, radius)
	end
	
	-- Back to the arrow

	function THROWING_ARROW_ENTITY.hit_player(self, obj, intersection_point)
		local pos = intersection_point
		local damage = 2*500
		throwing_arrow_punch_entity(obj, self, damage)
		boom(pos)
	end

	function THROWING_ARROW_ENTITY.hit_object(self, obj, intersection_point)
		local pos = intersection_point
		local damage = 2*500
		throwing_arrow_punch_entity(obj, self, damage)
		boom(pos)
	end

	function THROWING_ARROW_ENTITY.hit_node(self, under, above, intersection_point)
		boom(above)
	end

	function THROWING_ARROW_ENTITY.flight_particle(self, lpos, cpos)
		minetest.add_particlespawner({
			amount = 16,
			time = 0.1,
			minpos = cpos,
			maxpos = cpos,
			minvel = {x=-5, y=-5, z=-5},
			maxvel = {x=5,  y=5,  z=5},
			minacc = vector.new(),
			maxacc = vector.new(),
			minexptime = 0.3,
			maxexptime = 0.5,
			minsize = 0.5,
			maxsize = 1,
			texture = "throwing_sparkle.png",
			glow = 13,
		})
	end
	
	THROWING_ARROW_ENTITY.on_step = function(self, dtime)
		self.timer = self.timer + dtime
		local pos = self.object:get_pos()
		local node = minetest.get_node(pos)

		if not self.played_launch_sound then
			ambiance.sound_play("throwing_firework_launch", pos, 0.8, 2*64)
      self.played_launch_sound = true
		end

		-- Flight max timelimit.
		if self.timer > 2 then
			boom(self.lastpos)
			self.object:remove()
			return
		end

		-- Leave light trail.
		if node.name == 'air' then
			minetest.add_node(pos, {name="throwing:firework_trail"})
			minetest.get_node_timer(pos):start(0.1)
		end

		throwing.do_fly(self, dtime)
	end
	
	minetest.register_entity("throwing:arrow_fireworks_" .. color .. "_entity", THROWING_ARROW_ENTITY)
	
	minetest.register_craft({
		output = 'throwing:arrow_fireworks_' .. color,
		recipe = {
			{'dye:' .. color, 'tnt:gunpowder', 'default:stick'},
		}
	})
end

--~ Arrows

if not DISABLE_FIREWORKS_BLUE_ARROW then
	throwing_register_fireworks('blue', 'Blue')
end

if not DISABLE_FIREWORKS_RED_ARROW then
	throwing_register_fireworks('red', 'Red')
end

--~ Nodes

minetest.register_node("throwing:firework_trail", {
	drawtype = "airlike",
	light_source = 9,
	walkable = false,
  pointable = false,
  buildable_to = true,
	drop = "",
	groups = utility.dig_groups("item"),
	on_timer = function(pos, elapsed)
		minetest.remove_node(pos)
	end,
})

minetest.register_node("throwing:firework_boom", {
	drawtype = "plantlike",
	tiles = {"throwing_sparkle.png"},
	light_source = default.LIGHT_MAX - 1,
	walkable = false,
	drop = "",
	groups = utility.dig_groups("item"),
	on_timer = function(pos, elapsed)
		minetest.remove_node(pos)
	end,
	after_destruct = function(pos, oldnode)
		minetest.set_node(pos, {name="throwing:firework_light"})
		minetest.get_node_timer(pos):start(3)
	end,
})

minetest.register_node("throwing:firework_light", {
	drawtype = "airlike",
	light_source = default.LIGHT_MAX - 1,
  pointable = false,
  buildable_to = true,
	walkable = false,
	drop = "",
	groups = utility.dig_groups("item"),
	on_timer = function(pos, elapsed)
		minetest.remove_node(pos)
	end,
})