315 lines
9.0 KiB
Lua
315 lines
9.0 KiB
Lua
-- item_drop code by cyisfor
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-- https://github.com/cyisfor/item_drop
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if drops == nil then
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drops = {}
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end
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local movers = {}
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local removedAlreadyDammit = {}
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vector.fixedNormalize = function(v)
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assert(v)
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local len = vector.length(v)
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if len == 0 then
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-- no length 1 vector will ever equal this
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return vector.new(0,0,0)
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else
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return vector.divide(v, len)
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end
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end
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if not vector.dot then
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vector.dot = function(p1,p2)
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return p1.x * p2.x + p1.y * p2.y + p1.z * p2.z
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end
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end
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local function removeObject(object)
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movers[object] = nil
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removedAlreadyDammit[object] = true
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object:remove()
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end
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local function removeObjectWithSound(object)
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movers[object] = nil
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removedAlreadyDammit[object] = true
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local pos=object:getpos()
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minetest.sound_play("item_gone", {
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pos=pos,
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gain = 0.2,
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max_hear_distance = 32,
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})
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object:remove()
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end
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-- returns whether the pickup failed or not.
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-- nil pickupRadius means to infinity and beyond
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local function pickup(player, inv, object, pickupRadius)
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if removedAlreadyDammit[object] then
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-- this gets called after the timeout, as well as when it hits the player
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return true
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end
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if player == nil then return true end
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-- itemstring is serialized item so includes metadata
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local lua = object:get_luaentity()
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item = ItemStack(lua.itemstring)
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if inv and inv:room_for_item("main", item) then
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inv:add_item("main", item)
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if object:get_luaentity().itemstring ~= "" then
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minetest.sound_play("item_drop_pickup", {
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to_player = player:get_player_name(),
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gain = 0.4,
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})
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end
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lua.itemstring = ''
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removeObject(object)
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return false
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else
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return true
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end
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end
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local function isGood(object)
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-- only want items swooping up after players, not after chests!
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if not object:is_player() and object:get_luaentity() and object:get_luaentity().name == "__builtin:item" then
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return true
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else
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return false
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end
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end
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local function stop(object)
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movers[object] = nil
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-- no pickup, even though it's close, so
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-- stop moving towards the player
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object:setvelocity({x=0, y=0, z=0})
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object:setacceleration({x=0, y=0, z=0})
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-- also we can walk on it and it can push pressure plates
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-- physical_state = false means "please make us physical again"
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local lua = object:get_luaentity()
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if lua then
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lua.physical_state = false
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end
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--object:set_properties({
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-- physical = true
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--})
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end
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local function pickupOrStop(object, inv, player, pickupRadius)
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local lua = object:get_luaentity()
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if object == nil or lua == nil or lua.itemstring == nil then
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return
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end
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if pickup(player, inv, object, pickupRadius) then
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stop(object)
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end
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end
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-- GMass... it's the player's mass if the player were a giant planetlike object
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-- which things orbit around
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-- in the following units:
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-- if G = 6.67×10−11 then
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-- GMass = 1 for 14,992,503,748 kilograms
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drops.playerGMass = 1.7
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-- the player is faaaaaaaat
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local function moveTowards(object, player, pickupRadius, attractRadius)
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-- move it towards the player, then pick it up after a delay!
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local pos1 = player:getpos()
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if pos1 == nil then return end
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local pos2 = object:getpos()
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if pos2 == nil then return end
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pos1.y = pos1.y+0.5 -- head towards player's belt
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local direct = vector.subtract(pos1, pos2)
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local R = vector.length(direct)
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v = object:getvelocity()
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stopped = v.x == 0 and v.y == 0 and v.z == 0
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-- when direction(X) = direction(V) we passed the player
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-- so project V onto X. If same, passed. If not, approaching.
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-- projection = norm(X) * (length(V) * cos(theta))
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-- => length(V) * dot(V,X) / length(V) / length(X)
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-- = dot(V,X) / length(X)
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-- if X is normalized, length(X) == 1 so... dot product!
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-- sign(dot) > 0 = same direction sign(dot)< 0 = different
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direct = vector.fixedNormalize(direct)
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-- idea, set velocity not acceleration but set it
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-- not to velocity + acceleration, but to the projection of that
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-- onto the direction vector. object will always have velocity towards YOU
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if R > attractRadius then
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stop(object)
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return
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end
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if R < pickupRadius or (not stopped and vector.dot(v,direct) < 0) then
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pickupOrStop(object,player:get_inventory(),player,nil)
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return
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end
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-- Fg = G*M1*M2/R^2
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-- M1*A1 = G * M1 * M2 / R^2
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-- A1 = G * M2 / R ^2
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-- G = whatever it takes for stuff to orbit around the player
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-- and the weight of the player is ^^^
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-- A1 = C / R^2
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local A
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A = drops.playerGMass / R^2
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A = math.max(A,2*drops.playerGMass)
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object:setacceleration(vector.multiply(direct,A))
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end
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if minetest.setting_get("enable_item_pickup") == "true" then
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local tickets = 0 -- XXX: oy vey
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moveDelay = 0
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minetest.register_globalstep(function(dtime)
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-- it's much more efficient to just restart... no way to unregister_globalstep right?
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if not minetest.setting_get("enable_item_pickup") then return end
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moveDelay = moveDelay + dtime
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local pickupRadius = tonumber(minetest.setting_get("pickup_radius"))
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local attractRadius = tonumber(minetest.setting_get("attract_radius"))
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if not pickupRadius then pickupRadius = 0.5 end
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if not attractRadius then attractRadius = 3 end
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if moveDelay > 0.1 then
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moveDelay = 0
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-- correct your trajectory while moving
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for object,pair in pairs(movers) do
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local player = pair[1]
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moveTowards(object,player,pickupRadius,attractRadius)
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end
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end
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for _, player in ipairs(minetest.get_connected_players()) do
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if player:get_hp() > 0 or not minetest.setting_getbool("enable_damage") then
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local playerPosition = player:getpos()
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if playerPosition ~= nil then
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playerPosition.y = playerPosition.y + 0.5
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local inv = player:get_inventory()
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for _, object in ipairs(minetest.get_objects_inside_radius(playerPosition, 3)) do
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if isGood(object) and (object:get_luaentity().dropped_by ~= player:get_player_name() or object:get_luaentity().age > 3) and
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inv and
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inv:room_for_item("main", ItemStack(object:get_luaentity().itemstring))
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then
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local ticket = tickets
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movers[object] = {player,ticket}
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tickets = tickets + 1
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moveTowards(object, player, pickupRadius, attractRadius)
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-- make sure object doesn't push the player around!
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object:get_luaentity().physical_state = true
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object:get_luaentity().object:set_properties({
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physical = false,
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collide_with_objects = false,
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weight = 0
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})
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-- pleeease no immortal orbiting entities
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-- unless you want them to be >:)
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minetest.after(30, function(object)
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-- only if it's still moving
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-- but what if it started moving a second time?
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pair = movers[object]
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if pair and pair[2] == ticket then
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stop(object)
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end
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end, object)
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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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end)
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end
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if minetest.setting_get("enable_item_drops") == "true" then
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local old_handle_node_drops = minetest.handle_node_drops
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function new_handle_node_drops(pos, drops, digger)
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if digger and digger.is_fake_player then
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return old_handle_node_drops(pos, drops, digger)
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end
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local inv
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-- the digger might be a node, like a constructor
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if minetest.setting_getbool("creative_mode") and digger and digger:is_player() then
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inv = digger:get_inventory()
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end
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for _, item in ipairs(drops) do
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local count, name
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if type(item) == "string" then
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count = 1
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name = item
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else
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count = item:get_count()
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name = item:get_name()
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end
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-- Only drop the item if not in creative, or if the item is not in creative inventory
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if not inv or not inv:contains_item("main", ItemStack(name)) then
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for i=1, count do
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local obj = minetest.add_item(pos, item)
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if obj ~= nil then
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local x = math.random(1, 5)
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if math.random(1, 2) == 1 then
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x = -x
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end
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local z = math.random(1, 5)
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if math.random(1, 2) == 1 then
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z = -z
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end
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-- hurl it out into space at a random velocity
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-- (still falling though)
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obj:setvelocity({x=1/x, y=obj:getvelocity().y, z=1/z})
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end
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end
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end
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end
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-- the items have been dropped. Don't use builtin/item.lua or it could put the items
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-- into an inventory! (see quarry)
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-- return old_handle_node_drops(pos, drops, digger)
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end
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function checkSetting(pos, drops, digger)
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if minetest.setting_get("enable_item_drops") == "true" then
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return new_handle_node_drops(pos, drops, digger)
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else
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return old_handle_node_drops(pos, drops, digger)
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end
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end
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minetest.handle_node_drops = checkSetting
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end
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function minetest.item_drop(itemstack, dropper, pos)
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if dropper and dropper.get_player_name then
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local v = dropper:get_look_dir()
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local p = {x=pos.x+v.x, y=pos.y+1.5+v.y, z=pos.z+v.z}
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local r
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if dropper:get_player_control().sneak then
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r = itemstack
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itemstack = itemstack:to_table()
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itemstack.count = 1
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itemstack = ItemStack(itemstack)
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r:take_item()
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else
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r = ItemStack("")
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end
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minetest.sound_play("item_drop", {
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pos=pos,
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gain = 1.0,
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max_hear_distance = 32,
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})
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local obj = minetest.add_item(p, itemstack)
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if obj then
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v.x = v.x*2
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v.y = v.y*2 + 1
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v.z = v.z*2
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obj:setvelocity(v)
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obj:get_luaentity().dropped_by = dropper:get_player_name()
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end
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return r
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else
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minetest.add_item(pos, itemstack)
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return ItemStack("")
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end
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end
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