315 lines
9.6 KiB
Lua
315 lines
9.6 KiB
Lua
--
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-- Snowballs and other throwable items
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--
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local GRAVITY = tonumber(minetest.settings:get("movement_gravity"))
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local entity_mapping = {
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["mcl_throwing:snowball"] = "mcl_throwing:snowball_entity",
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["mcl_throwing:egg"] = "mcl_throwing:egg_entity",
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["mcl_throwing:ender_pearl"] = "mcl_throwing:ender_pearl_entity",
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}
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local velocities = {
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["mcl_throwing:snowball_entity"] = 22,
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["mcl_throwing:egg_entity"] = 22,
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["mcl_throwing:ender_pearl_entity"] = 22,
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}
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mcl_throwing.throw = function(throw_item, pos, dir, velocity)
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if velocity == nil then
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velocity = velocities[throw_item]
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end
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if velocity == nil then
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velocity = 22
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end
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local itemstring = ItemStack(throw_item):get_name()
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local obj = minetest.add_entity(pos, entity_mapping[itemstring])
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obj:setvelocity({x=dir.x*velocity, y=dir.y*velocity, z=dir.z*velocity})
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obj:setacceleration({x=dir.x*-3, y=-GRAVITY, z=dir.z*-3})
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return obj
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end
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-- Throw item
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local throw_function = function(entity_name, velocity)
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local func = function(item, player, pointed_thing)
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local playerpos = player:getpos()
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local dir = player:get_look_dir()
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local obj = mcl_throwing.throw(item, {x=playerpos.x, y=playerpos.y+1.5, z=playerpos.z}, dir, velocity)
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obj:get_luaentity()._thrower = player:get_player_name()
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if not minetest.settings:get_bool("creative_mode") then
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item:take_item()
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end
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return item
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end
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return func
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end
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-- Staticdata handling because objects may want to be reloaded
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local get_staticdata = function(self)
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local data = {
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_lastpos = self._lastpos,
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_thrower = self._thrower,
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}
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return minetest.serialize(data)
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end
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local on_activate = function(self, staticdata, dtime_s)
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local data = minetest.deserialize(staticdata)
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if data then
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self._lastpos = data._lastpos
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self._thrower = data._thrower
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end
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end
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-- The snowball entity
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local snowball_ENTITY={
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physical = false,
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timer=0,
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textures = {"mcl_throwing_snowball.png"},
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visual_size = {x=0.5, y=0.5},
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collisionbox = {0,0,0,0,0,0},
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get_staticdata = get_staticdata,
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on_activate = on_activate,
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_lastpos={},
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}
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local egg_ENTITY={
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physical = false,
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timer=0,
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textures = {"mcl_throwing_egg.png"},
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visual_size = {x=0.45, y=0.45},
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collisionbox = {0,0,0,0,0,0},
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get_staticdata = get_staticdata,
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on_activate = on_activate,
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_lastpos={},
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}
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-- Ender pearl entity
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local pearl_ENTITY={
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physical = false,
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timer=0,
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textures = {"mcl_throwing_ender_pearl.png"},
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visual_size = {x=0.9, y=0.9},
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collisionbox = {0,0,0,0,0,0},
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get_staticdata = get_staticdata,
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on_activate = on_activate,
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_lastpos={},
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_thrower = nil, -- Player ObjectRef of the player who threw the ender pearl
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}
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-- Snowball on_step()--> called when snowball is moving.
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local snowball_on_step = function(self, dtime)
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self.timer=self.timer+dtime
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local pos = self.object:getpos()
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local node = minetest.get_node(pos)
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local def = minetest.registered_nodes[node.name]
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-- Destroy when hitting a solid node
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if self._lastpos.x~=nil then
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if (def and def.walkable) or not def then
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self.object:remove()
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return
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end
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end
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self._lastpos={x=pos.x, y=pos.y, z=pos.z} -- Set _lastpos-->Node will be added at last pos outside the node
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end
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-- Movement function of egg
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local egg_on_step = function(self, dtime)
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self.timer=self.timer+dtime
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local pos = self.object:getpos()
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local node = minetest.get_node(pos)
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local def = minetest.registered_nodes[node.name]
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-- Destroy when hitting a solid node
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if self._lastpos.x~=nil then
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if (def and def.walkable) or not def then
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-- 1/8 chance to spawn a chick
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-- FIXME: Chicks have a quite good chance to spawn in walls
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local r = math.random(1,8)
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-- Turn given object into a child
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local make_child= function(object)
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local ent = object:get_luaentity()
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object:set_properties({
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visual_size = { x = ent.base_size.x/2, y = ent.base_size.y/2 },
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collisionbox = {
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ent.base_colbox[1]/2,
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ent.base_colbox[2]/2,
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ent.base_colbox[3]/2,
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ent.base_colbox[4]/2,
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ent.base_colbox[5]/2,
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ent.base_colbox[6]/2,
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}
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})
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ent.child = true
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end
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if r == 1 then
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make_child(minetest.add_entity(self._lastpos, "mobs_mc:chicken"))
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-- BONUS ROUND: 1/32 chance to spawn 3 additional chicks
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local r = math.random(1,32)
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if r == 1 then
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local offsets = {
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{ x=0.7, y=0, z=0 },
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{ x=-0.7, y=0, z=-0.7 },
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{ x=-0.7, y=0, z=0.7 },
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}
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for o=1, 3 do
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local pos = vector.add(self._lastpos, offsets[o])
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make_child(minetest.add_entity(pos, "mobs_mc:chicken"))
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end
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end
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end
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self.object:remove()
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return
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end
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end
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self._lastpos={x=pos.x, y=pos.y, z=pos.z} -- Set lastpos-->Node will be added at last pos outside the node
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end
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-- Movement function of ender pearl
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local pearl_on_step = function(self, dtime)
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self.timer=self.timer+dtime
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local pos = self.object:getpos()
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pos.y = math.floor(pos.y)
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local node = minetest.get_node(pos)
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local nn = node.name
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local def = minetest.registered_nodes[node.name]
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-- Destroy when hitting a solid node
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if self._lastpos.x~=nil then
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local walkable = (def and def.walkable)
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-- No teleport for hitting ignore for now. Otherwise the player could get stuck.
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-- FIXME: This also means the player loses an ender pearl for throwing into unloaded areas
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if node.name == "ignore" then
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self.object:remove()
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-- Activate when hitting a solid node or a plant
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elseif walkable or nn == "mcl_core:vine" or nn == "mcl_core:deadbush" or minetest.get_item_group(nn, "flower") ~= 0 or minetest.get_item_group(nn, "sapling") ~= 0 or minetest.get_item_group(nn, "plant") ~= 0 or minetest.get_item_group(nn, "mushroom") ~= 0 or not def then
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local player = minetest.get_player_by_name(self._thrower)
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if player then
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-- Teleport and hurt player
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-- First determine good teleport position
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local dir = {x=0, y=0, z=0}
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local v = self.object:getvelocity()
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if walkable then
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local vc = table.copy(v) -- vector for calculating
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-- Node is walkable, we have to find a place somewhere outside of that node
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vc = vector.normalize(vc)
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-- Zero-out the two axes with a lower absolute value than
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-- the axis with the strongest force
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local lv, ld
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lv, ld = math.abs(vc.y), "y"
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if math.abs(vc.x) > lv then
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lv, ld = math.abs(vc.x), "x"
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end
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if math.abs(vc.z) > lv then
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lv, ld = math.abs(vc.z), "z"
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end
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if ld ~= "x" then vc.x = 0 end
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if ld ~= "y" then vc.y = 0 end
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if ld ~= "z" then vc.z = 0 end
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-- Final tweaks to the teleporting pos, based on direction
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-- Impact from the side
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dir.x = vc.x * -1
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dir.z = vc.z * -1
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-- Special case: top or bottom of node
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if vc.y > 0 then
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-- We need more space when impact is from below
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dir.y = -2.3
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elseif vc.y < 0 then
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-- Standing on top
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dir.y = 0.5
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end
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end
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-- If node was not walkable, no modification to pos is made.
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-- Final teleportation position
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local telepos = vector.add(pos, dir)
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local telenode = minetest.get_node(telepos)
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--[[ It may be possible that telepos is walkable due to the algorithm.
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Especially when the ender pearl is faster horizontally than vertical.
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This applies final fixing, just to be sure we're not in a walkable node ]]
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if not minetest.registered_nodes[telenode.name] or minetest.registered_nodes[telenode.name].walkable then
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if v.y < 0 then
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telepos.y = telepos.y + 0.5
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else
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telepos.y = telepos.y - 2.3
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end
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end
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local oldpos = player:getpos()
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-- Teleport and hurt player
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player:setpos(telepos)
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player:set_hp(player:get_hp() - 5)
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-- 5% chance to spawn endermite at the player's origin
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local r = math.random(1,20)
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if r == 1 then
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minetest.add_entity(oldpos, "mobs_mc:endermite")
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end
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end
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self.object:remove()
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return
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end
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end
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self._lastpos={x=pos.x, y=pos.y, z=pos.z} -- Set lastpos-->Node will be added at last pos outside the node
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end
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snowball_ENTITY.on_step = snowball_on_step
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egg_ENTITY.on_step = egg_on_step
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pearl_ENTITY.on_step = pearl_on_step
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minetest.register_entity("mcl_throwing:snowball_entity", snowball_ENTITY)
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minetest.register_entity("mcl_throwing:egg_entity", egg_ENTITY)
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minetest.register_entity("mcl_throwing:ender_pearl_entity", pearl_ENTITY)
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local how_to_throw = "Hold it in your and and leftclick to throw."
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-- Snowball
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minetest.register_craftitem("mcl_throwing:snowball", {
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description = "Snowball",
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_doc_items_longdesc = "Snowballs can be thrown or launched from a dispenser for fun. Hitting something with a snowball does nothing.",
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_doc_items_usagehelp = how_to_throw,
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inventory_image = "mcl_throwing_snowball.png",
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stack_max = 16,
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on_use = throw_function("mcl_throwing:snowball_entity"),
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})
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-- Egg
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minetest.register_craftitem("mcl_throwing:egg", {
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description = "Egg",
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_doc_items_longdesc = "Eggs can be thrown or launched from a dispenser and breaks on impact. There is a small chance that 1 or even 4 chickens will pop out of the egg when it hits the ground.",
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_doc_items_usagehelp = how_to_throw,
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inventory_image = "mcl_throwing_egg.png",
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stack_max = 16,
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on_use = throw_function("mcl_throwing:egg_entity"),
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groups = { craftitem = 1 },
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})
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-- Ender Pearl
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minetest.register_craftitem("mcl_throwing:ender_pearl", {
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description = "Ender Pearl",
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_doc_items_longdesc = "An ender pearl is an item which can be used for teleportation at the cost of health. It can be thrown and teleport the thrower to its impact location when it hits a solid block, a plant or vines. Each teleportation hurts the user by 5 hit points.",
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_doc_items_usagehelp = how_to_throw,
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wield_image = "mcl_throwing_ender_pearl.png",
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inventory_image = "mcl_throwing_ender_pearl.png",
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stack_max = 16,
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on_use = throw_function("mcl_throwing:ender_pearl_entity"),
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})
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