[hc_wolf]

here are two codes to help

sorry no time to explain

    private void FindNearestMarker(out Point2d target, Point2d basePoint, int army)         // piano, I find the nearest marker to the country
    {
        Point2d res = new Point2d(-1,-1);
        double minDist = 9999999999.9 ;
        foreach (MissionMarker mm in MissionMarkers)
        {
            if (mm.army == army)
            {
                double curDist = Math.Sqrt(Math.Pow((basePoint.x - mm.x),2 )+ Math.Pow((basePoint.y - mm.y),2));
                if (curDist < minDist)
                {
                    minDist = curDist;
                    res.x = mm.x; res.y = mm.y;
                }
            }
        } 
        target = res;
    }

    private bool PointBetween(double intervalPoint1,double intervalPoint2,double point)         // kh-n checks whether the point lies in the interval
    {
        return ((point > Math.Min(intervalPoint1, intervalPoint2)) && (point < Math.Max(intervalPoint1, intervalPoint2)));
    }

    private void FindFinishPoint(out Point2d target,Point2d startPoint, int army)               // piano, I find the final destination
    {
        Point2d res = new Point2d(-1, -1);
        int enemyArmy = (army == 1) ? 2 : 1;        
        Point2d nearestEnemyMarker;
        Point3d startPos = new Point3d(startPoint.x, startPoint.y,0);
        FindNearestMarker(out nearestEnemyMarker, startPoint, enemyArmy);                       // first find the closest enemy marker
        AiActor nearestEnemyGG = FindGroundTarget(enemyArmy, startPos);                         // then the nearest group of enemy
        if (nearestEnemyGG != null)
        {
            if ((PointBetween(startPoint.x, nearestEnemyMarker.x, nearestEnemyGG.Pos().x)) && (PointBetween(startPoint.y, nearestEnemyMarker.y, nearestEnemyGG.Pos().y)))
            {
                res.x = nearestEnemyGG.Pos().x;
                res.y = nearestEnemyGG.Pos().y;
            }
            else res = nearestEnemyMarker;                                                      // and select one of them is closer
        }
        target = res;
    }