Minetest Forums

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    static int l_setpos(lua_State *L)
    {
        ObjectRef *ref = checkobject(L, 1);
        //LuaEntitySAO *co = getluaobject(ref);
        v3f pos = readFloatPos(L, 2);
        ServerRemotePlayer *player = getplayer(ref);
        if(player != NULL)
        {
            player->setPos(pos);

            std::ostringstream os(std::ios::binary);
            // command (3 = force update position)
            writeU8(os, 3);
            // pos
            writeV3F1000(os, pos);
            // yaw
            writeF1000(os, player->getYaw());
            // create message and add to list
            ActiveObjectMessage aom(player->getId(), false, os.str());
            player->m_messages_out.push_back(aom);

            return 0;
        }
        ServerActiveObject *co = getobject(ref);

        if(co != NULL)
        {
            // Do it
            co->setPos(pos);
            return 0;
        }
        return 0;
    }

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    void processMessage(const std::string &data)
    {
        //infostream<<"PlayerCAO: Got message"<<std::endl;
        std::istringstream is(data, std::ios::binary);
        // command
        u8 cmd = readU8(is);
        if(cmd == 0) // update position
        {
            // pos
            m_position = readV3F1000(is);
            // yaw
            m_yaw = readF1000(is);

            pos_translator.update(m_position, false);

            updateNodePos();
        }
        else if(cmd == 1) // punched
        {
            // damage
            s16 damage = readS16(is);

            if(m_is_local_player)
                m_env->damageLocalPlayer(damage, false);

            m_damage_visual_timer = 0.5;
            updateTextures("^[brighten");
        }
        else if(cmd == 3) // force update position
        {
            // pos
            m_position = readV3F1000(is);
            // yaw
            m_yaw = readF1000(is);

            if(m_is_local_player)
            {
                m_local_player->setPosition(m_position);
            }

            pos_translator.update(m_position, false);

            updateNodePos();
        }
    }

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    -- first state: cart is moving
    if self.moving ~= false and self.time == 0 then
        local pos_f = self.object:getpos()
        if self.moving ~= false then
            if eq(pos_f.x, self.moving.x) and eq(pos_f.y, self.moving.y) and eq(pos_f.z, self.moving.z) then
                self.moving = false
                self.object:setacceleration({x = 0, y = -10, z = 0})
                if self.stopnow then
                    self.stopnow = false
                    self.attached_to = false
                end
            else
                local needed = {x = self.moving.x - pos_f.x,
                                y = self.moving.y - pos_f.y,
                                z = self.moving.z - pos_f.z}
                needed = resize(needed, math.min(length(needed), speed))
                self.object:setpos(move(pos_f, needed))

                -- move player that attached to this cart; FIXME
                local player = minetest.env:get_player_by_name(self.attached_to)
                if player ~= nil then
                    --print (self.attached_to .. " moved to " .. self.object:getpos().x .. ", " .. self.object:getpos().y .. ", " .. self.object:getpos().z)
                    p_pos = self.object:getpos()
                    p_pos.y = p_pos.y - 0.5
                    player:setpos(p_pos)
                end
            end

            return
        end
    end

    -- second state: cart just need to check whether to move next self.time==0

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function cart:on_rightclick(clicker)
    if self.attached_to == false then
        local playerpos = clicker:getpos()
        local selfpos = self.object:getpos()

        if ((playerpos.x-1) < selfpos.x and (playerpos.x+1) > selfpos.x and
            (playerpos.y-2) < (selfpos.y) and (playerpos.y+1) > (selfpos.y) and
            (playerpos.z-1) < selfpos.z and (playerpos.z+1) > selfpos.z) then
            self.attached_to = clicker:get_player_name()
        else
            self.attached_to = ""
        end
        local best = 1e15
        -- find initial moving direction by searching through 4 nearby possibly positions
        self.vec = {x = 1, z = 0}
        for dx = -1,1 do
            for dz = -1,1 do
                if (dx * dz == 0) and (dx ~= 0 or dz ~= 0) then
                    local dst = dist(playerpos, {x = selfpos.x + dx, z = selfpos.z + dz})
                    if dst < best
                        and (is_rail({x = selfpos.x - dx, y = selfpos.y, z = selfpos.z - dz})
                        or is_rail({x = selfpos.x - dx, y = selfpos.y + 1, z = selfpos.z - dz})
                        or is_rail({x = selfpos.x - dx, y = selfpos.y - 1, z = selfpos.z - dz})) then
                            best = dst
                            self.vec = {x = -dx, z = -dz}
                    end
                end
            end
        end
    else
        self.stopnow = true
    end
end