Posição

SNAKE = {
    _VERSION="1.0",
    
    itemid=1739,
    freeglobalstorage=28103,
    itemFood=6394,
    controlpos={x=1024,y=1062,z=12},
    exitpos = {x=1023,y=1053,z=13},
    centerpos={x=1023,y=1061,z=13},
    timer = function(cid,n,pos_,time)
        local pos_ = pos_ or {{SNAKE.centerpos}}
        setGlobalStorageValue(SNAKE.freeglobalstorage,cid)
        if not isPlayer(cid) then
            SNAKE.clean()
            return
        end
            for i,pos in pairs(pos_) do
                SNAKE.find_and_delete(pos[1])
                if i == 1 then
                    pos[2] = SNAKE.copypos(pos[1])
                    pos[1] = getPosByDir({x=pos[1].x,y=pos[1].y,z=pos[1].z,stackpos=255},getCreatureLookDir(cid))
                else
                    pos[2] = SNAKE.copypos(pos[1])
                    pos[1] = pos_[i-1][2]
                end
                local ret,p,walk = SNAKE.check(pos[1])
                if ret == 1 or ret == 3 then
                    addEvent(doTeleportThing,1000,cid,SNAKE.exitpos)
                    addEvent(doCreatureSay,1100,cid,'Points '..(#pos_-1)..'.')
                    SNAKE.clean()
                    setGlobalStorageValue(SNAKE.freeglobalstorage,0)
                    return
                end
                if ret == 2 then
                    doRemoveItem(p.uid,-1)
                    if p.itemid == SNAKE.itemFood then
                        pos_[#pos_+1] = {pos[2],pos[2]}
                        for i=1,5 do
                            addEvent(doSendMagicEffect,100*i,pos[1],29)
                        end
                        SNAKE.generateFood()
                    end
                end
                doCreateItem(SNAKE.itemid,1,pos[1])

            end
            local plpos = getCreaturePosition(cid)
            local generated = {}
            for i=0,3 do
                generated = getPosByDir({x=SNAKE.controlpos.x,y=SNAKE.controlpos.y,z=SNAKE.controlpos.z},i)
            end
            for i,pos in pairs(generated) do
                if SNAKE.samepos(plpos,pos) then

                    doTeleportThing(cid,SNAKE.controlpos,false)
                end
                addEvent(doSendMagicEffect,100,pos,56,cid)
            end
        addEvent(SNAKE.timer,time,cid,n,pos_,time)
    end,
    copypos = function(p)
        return {x=p.x,y=p.y,z=p.z,stackpos=p.stackpos}
		       
    end,
    samepos = function(p1,p2)
        if p1.x == p2.x and p1.y == p2.y then
            return true
        end
        return false
    end,
    generateFood = function()
        local pp = {x=SNAKE.centerpos.x+math.random(-6,6),y=SNAKE.centerpos.y+math.random(-4,4),z=SNAKE.centerpos.z}
        for i=1,5 do
            addEvent(doSendMagicEffect,100*i,pp,30)
        end
        doCreateItem(SNAKE.itemFood,1,pp)
    end,
    clean = function()
        for y=-4,4 do
            for x=-6,6 do
                local pp = {x=SNAKE.centerpos.x+x,y=SNAKE.centerpos.y+y,z=SNAKE.centerpos.z}
                for i=250,255 do
                    pp.stackpos = i
                    local p = getThingFromPos(pp)
                    if p.itemid ~= 0 then
                        doRemoveItem(p.uid,-1)
                        doSendMagicEffect(pp,15)
                    end
                end
            end
        end
    end,
    check = function(pos)
        for i=1,10 do
            pos.stackpos = i
            local p = getThingFromPos(pos)
            if p.itemid == SNAKE.itemid then
                return 1,p,true
            elseif not SNAKE.isWalkable(pos) then
                return 3,p,false
            elseif p.itemid ~= 0 then
                return 2,p
            end
        end
        return false
    end,
    find_and_delete = function(pos)
        for i=0,255 do
            pos.stackpos = 255-i
            local p = getThingFromPos(pos)
            if p.itemid == SNAKE.itemid then
                return doRemoveItem(p.uid,1)
            end
        end
    end,
    isWalkable = function(pos, creature, proj, pz)-- by Nord
        if getTileThingByPos({x = pos.x, y = pos.y, z = pos.z, stackpos = 0}).itemid == 0 then return false end
        if getTopCreature(pos).uid > 0 and creature then return false end
        if getTileInfo(pos).protection and pz then return false, true end
        local n = not proj and 3 or 2
        for i = 0, 255 do
            pos.stackpos = i
            local tile = getTileThingByPos(pos)
            if tile.itemid ~= 0 and not isCreature(tile.uid) then
                if hasProperty(tile.uid, n) or hasProperty(tile.uid, 7) then
                    return false
                end
            end
        end
        return true
    end,
}