/*
         * update all the ant operator
         *
         */

        private void UpdateAntPopulation(AntPopulation pAntPopulation)
        {
            Ant[] tAnts = pAntPopulation.mAnts;
            for (int i = 0; i < tAnts.Length; i++)
            {
                tAnts [i].mPositionIndex = InfluenceMap.getInstance().getTilefromPosition(new Vector2(tAnts[i].mAIRT.transform.position.x, tAnts[i].mAIRT.transform.position.z));
                tAnts [i].Add(tAnts[i].mPositionIndex);
                if (tAnts [i].mInfoFood > 0.0f)
                {
                    tAnts [i].mAIRT.GetComponent <MeshRenderer> ().material.color = Color.green;
                }
                else if (tAnts [i].mInfoHome > 0.0f)
                {
                    tAnts [i].mAIRT.GetComponent <MeshRenderer> ().material.color = Color.blue;
                }
                else
                {
                    tAnts [i].mAIRT.GetComponent <MeshRenderer> ().material.color = Color.red;
                }

                // update ant with finding food logic or finding home logic
                if (tAnts [i].mNowTarget == NowTarget.FOOD)
                {
                    OnFood(tAnts[i], pAntPopulation);
                }
                else if (tAnts [i].mNowTarget == NowTarget.HOME)
                {
                    OnHome(tAnts[i], pAntPopulation);
                }
            }
        }
        // finding food logic
        private void OnFood(Ant pAnt, AntPopulation ap)
        {
            Vector2 v1 = new Vector2(pAnt.mAIRT.transform.position.x, pAnt.mAIRT.transform.position.z);
            Vector2 v2 = new Vector2(pAnt.mNowPositionTarget.x, pAnt.mNowPositionTarget.z);

            float dis = Vector2.Distance(v1, v2);

            if (pAnt.mNowPositionTarget == Vector3.zero || dis < 0.35f)
            {
                // update Pheromone
                if (pAnt.mInfoHome > 0.0f)
                {
                    UpdatePheromone(ap.mInfluenceHomeTag, pAnt.mInfoHome, ap.mRadiationRiaus, pAnt.mPositionIndex, 1600, pAnt.mClosedArray.Count);
                }
                GameObject g_target = FindTarget(pAnt.mAIRT.transform.position, pAnt.mObserverDistance, ap.mTagDistination);
                GameObject g_home   = FindTarget(pAnt.mAIRT.transform.position, pAnt.mObserverDistance, ap.mTagHome);
                // find the food
                if (g_target != null)
                {
                    pAnt.mInfoHome          = -1.0f;
                    pAnt.mInfoFood          = 200.0f;
                    pAnt.mNowTarget         = NowTarget.HOME;
                    pAnt.mNowPositionTarget = g_target.transform.position;
                    pAnt.mClosedArray.Clear();
                    pAnt.mLastDir = Vector2.zero;
                    return;
                }

                if (g_home != null)
                {
                    pAnt.mInfoFood = -1.0f;
                    pAnt.mInfoHome = 200.0f;
                }
                // compute the new dirction
                pAnt.mNowPositionTarget = ComputeDirction(pAnt, ap);
            }
            else
            {
                // move the ant
                Vector3 offset = pAnt.mNowPositionTarget - pAnt.mAIRT.transform.position;
                offset.Normalize();
                offset.y = 0;
                pAnt.mAIRT.transform.Translate(offset * Time.deltaTime * 6);
            }
        }
        // compute new dirction
        private Vector3 ComputeDirction(Ant pAnt, AntPopulation ap)
        {
            Vector3 result = Vector3.zero;

            Vector2 resultNineGrid = Vector2.zero;

            int index = -1;

            if (pAnt.mNowTarget == NowTarget.FOOD)
            {
                index = InfluenceMap.getInstance().mDictionary [ap.mInfluenceDistinationTag];
            }
            else
            {
                index = InfluenceMap.getInstance().mDictionary [ap.mInfluenceHomeTag];
            }

            float tMax = InfluenceMap.getInstance().getMax(pAnt.mPositionIndex, 1, index);

            // find the information
            if (tMax > 0.0f)
            {
                //Debug.Log (pAnt.mNowTarget.ToString()+" "+tMax+" infoFood:"+pAnt.mInfoFood+" infoHome"+pAnt.mInfoHome);

                float minusRate = 0.0002f;
                if (Random.Range(0.0f, 1.0f) < minusRate)
                {
                    // just a little rate for random dir
                    int RandomIndex = Random.Range(0, InfluenceMap.getInstance().NineGrid.Length);

                    resultNineGrid = InfluenceMap.getInstance().NineGrid [RandomIndex];

                    if (pAnt.mLastDir != Vector2.zero)
                    {
                        resultNineGrid = pAnt.mLastDir;
                    }

                    float minusRate_ = 0.2f;

                    if (Random.Range(0.0f, 1.0f) < minusRate_)
                    {
                        RandomIndex    = Random.Range(0, InfluenceMap.getInstance().NineGrid.Length);
                        resultNineGrid = resultNineGrid = InfluenceMap.getInstance().NineGrid [RandomIndex];
                    }

                    int count = 0;

                    while ((InfluenceMap.getInstance().isWall(resultNineGrid + pAnt.mPositionIndex) || pAnt.Contains(resultNineGrid + pAnt.mPositionIndex)) && count < 10)
                    {
                        RandomIndex    = Random.Range(0, InfluenceMap.getInstance().NineGrid.Length);
                        resultNineGrid = InfluenceMap.getInstance().NineGrid [RandomIndex];
                        count++;
                    }
                }
                else
                {
                    // compute the new dir by RW with rate

                    float sum = 0.0f;

                    float max = -1.0f;
                    for (int i = 0; i < InfluenceMap.getInstance().NineGrid.Length; i++)
                    {
                        Vector2 delta = InfluenceMap.getInstance().NineGrid [i];
                        Vector2 real  = pAnt.mPositionIndex + delta;
                        if (real.x >= 0 && real.x < InfluenceMap.getInstance().wtileCount&&real.y >= 0 && real.y < InfluenceMap.getInstance().htileCount)
                        {
                            sum += InfluenceMap.getInstance().IMData [index] [(int)real.x] [(int)real.y];
                        }
                    }

                    int index1 = Random.Range(0, InfluenceMap.getInstance().NineGrid.Length);

                    for (int i = 0; i < InfluenceMap.getInstance().NineGrid.Length; i++)
                    {
                        int     realI = (i + index1) % InfluenceMap.getInstance().NineGrid.Length;
                        Vector2 delta = InfluenceMap.getInstance().NineGrid [realI];
                        Vector2 real  = pAnt.mPositionIndex + delta;
                        float   tRate = 0.0f;

                        if (real.x >= 0 && real.x < InfluenceMap.getInstance().wtileCount&&real.y >= 0 && real.y < InfluenceMap.getInstance().htileCount)
                        {
                            tRate = InfluenceMap.getInstance().IMData [index] [(int)real.x] [(int)real.y] / sum;
                        }

                        if (Random.Range(0.0f, 1.0f) < tRate && !InfluenceMap.getInstance().isWall(delta + pAnt.mPositionIndex))
                        {
                            resultNineGrid = new Vector2(delta.x, delta.y);
                            break;
                        }
                    }
                }
            }
            else
            {
                // no find the information so the new dirtion is a random dir
                int RandomIndex = Random.Range(0, InfluenceMap.getInstance().NineGrid.Length);

                resultNineGrid = InfluenceMap.getInstance().NineGrid [RandomIndex];

                if (pAnt.mLastDir != Vector2.zero)
                {
                    resultNineGrid = pAnt.mLastDir;
                }

                float minusRate_ = 0.2f;

                if (Random.Range(0.0f, 1.0f) < minusRate_)
                {
                    RandomIndex    = Random.Range(0, InfluenceMap.getInstance().NineGrid.Length);
                    resultNineGrid = resultNineGrid = InfluenceMap.getInstance().NineGrid [RandomIndex];
                }

                int count = 0;

                while ((InfluenceMap.getInstance().isWall(resultNineGrid + pAnt.mPositionIndex) || pAnt.Contains(resultNineGrid + pAnt.mPositionIndex)) && count < 10)
                {
                    RandomIndex    = Random.Range(0, InfluenceMap.getInstance().NineGrid.Length);
                    resultNineGrid = InfluenceMap.getInstance().NineGrid [RandomIndex];
                    count++;
                }
                //Debug.Log (pAnt.Contains(resultNineGrid+pAnt.mPositionIndex));
            }

            pAnt.mLastDir = new Vector2(resultNineGrid.x, resultNineGrid.y);


            float tx = pAnt.mPositionIndex.x + resultNineGrid.x;
            float ty = pAnt.mPositionIndex.y + resultNineGrid.y;

            tx = Mathf.Clamp(tx, 0, InfluenceMap.getInstance().wtileCount - 1);
            ty = Mathf.Clamp(ty, 0, InfluenceMap.getInstance().htileCount - 1);

            Vector2 tile = new Vector2(tx, ty);

            //	Debug.Log (pAnt.Contains(tile));

            result = InfluenceMap.getInstance().GetPositionByTile(tile);

            return(result);
        }