technic-cd2025/technic/tools/mining_lasers.lua

local mat = technic.materials

local mining_lasers_list = {
--	{<num>, <range of the laser shots>, <max_charge>, <charge_per_shot>},
	{"1", 7, 50000, 1000},
	{"2", 14, 200000, 2000},
	{"3", 21, 650000, 3000},
}
local allow_entire_discharging = true

local S = technic.getter

minetest.register_craft({
	output = "technic:laser_mk1",
	recipe = {
		{mat.diamond, "basic_materials:brass_ingot",        mat.obsidian_glass},
		{"",                "basic_materials:brass_ingot",        "technic:red_energy_crystal"},
		{"",                "",                           mat.copper_ingot},
	}
})
minetest.register_craft({
	output = "technic:laser_mk2",
	recipe = {
		{mat.diamond, "technic:carbon_steel_ingot", "technic:laser_mk1"},
		{"",                "technic:carbon_steel_ingot", "technic:green_energy_crystal"},
		{"",                "",                           mat.copper_ingot},
	}
})
minetest.register_craft({
	output = "technic:laser_mk3",
	recipe = {
		{mat.diamond, "technic:carbon_steel_ingot", "technic:laser_mk2"},
		{"",                "technic:carbon_steel_ingot", "technic:blue_energy_crystal"},
		{"",                "",                           mat.copper_ingot},
	}
})

local function laser_node(pos, node, player)
	local def = minetest.registered_nodes[node.name]
	if def.liquidtype ~= "none" and def.buildable_to then
		minetest.remove_node(pos)
		minetest.add_particle({
			pos = pos,
			velocity = {x = 0, y = 1.5 + math.random(), z = 0},
			acceleration = {x = 0, y = -1, z = 0},
			size = 6 + math.random() * 2,
			texture = "smoke_puff.png^[transform" .. math.random(0, 7),
		})
		return
	end
	def.on_dig(pos, node, player)
end

local keep_node = {air = true}
local function can_keep_node(name)
	if keep_node[name] ~= nil then
		return keep_node[name]
	end
	keep_node[name] = minetest.get_item_group(name, "hot") ~= 0
	return keep_node[name]
end

local function laser_shoot(player, range, particle_texture, sound)
	local player_pos = player:get_pos()
	local player_name = player:get_player_name()
	local dir = player:get_look_dir()

	local start_pos = vector.new(player_pos)
	-- Adjust to head height
	start_pos.y = start_pos.y + (player:get_properties().eye_height or 1.625)
	minetest.add_particle({
		pos = start_pos,
		velocity = dir,
		acceleration = vector.multiply(dir, 50),
		expirationtime = (math.sqrt(1 + 100 * (range + 0.4)) - 1) / 50,
		size = 1,
		texture = particle_texture .. "^[transform" .. math.random(0, 7),
	})
	minetest.sound_play(sound, {pos = player_pos, max_hear_distance = range}, true)
	for pos in technic.trace_node_ray_fat(start_pos, dir, range) do
		if minetest.is_protected(pos, player_name) then
			minetest.record_protection_violation(pos, player_name)
			break
		end
		local node = minetest.get_node(pos)
		if node.name == "ignore"
				or not minetest.registered_nodes[node.name] then
			break
		end
		if not can_keep_node(node.name) then
			laser_node(pos, node, player)
		end
	end
end

for _, m in pairs(mining_lasers_list) do
	technic.register_power_tool("technic:laser_mk"..m[1], {
		description = S("Mining Laser Mk@1", m[1]),
		inventory_image = "technic_mining_laser_mk"..m[1]..".png",
		range = 0,
		max_charge = m[3],
		on_use = function(itemstack, user)
			local charge = technic.get_RE_charge(itemstack)
			if charge > 0 then
				local range = m[2]
				if charge < m[4] then
					if not allow_entire_discharging then
						return
					end
					-- If charge is too low, give the laser a shorter range
					range = range * charge / m[4]
				end
				technic.use_RE_charge(itemstack, math.min(m[4], charge))
				laser_shoot(user, range, "technic_laser_beam_mk" .. m[1] .. ".png", "technic_laser_mk" .. m[1])
				return itemstack
			end
		end,
	})
end