class Nest
{
  int[][] nestStructure;
  int xMin;
  int xMax;
  int yMin;
  int yMax;
  int xCenter;
  int yCenter;
  int xDir;
  int yDir;
  int currX;
  int currY;
  int xEnd;
  int yEnd;
  int passedEndXY;
  
  Nest(int maxSize)
  {
    nestStructure = new int[maxSize][maxSize];
    for (int i=0; i<nestStructure.length; i++)
    {
      for (int k=0; k<nestStructure[0].length;k++)
      {
        nestStructure[i][k] = 0;
      }
    }
    xCenter = nestStructure.length /2;
    yCenter = nestStructure[0].length /2;
    xMin = xCenter;
    xMax = xCenter;
    yMin = yCenter;
    yMax = yCenter;
    currX = xCenter;
    currY = yCenter;
    xEnd = xCenter;
    yEnd = yCenter;
    xDir = 0;
    yDir = 0;
    passedEndXY=0;
  }
  
  void addBrick()
  {
    nestStructure[currX][currY]++;
    if ( currX == xEnd && currY == yEnd)
    {
      passedEndXY++;
    }
    if (passedEndXY >=2)
    {
      xMin = xCenter-1;
      xMax = xCenter+1;
      yMin = yCenter-1;
      yMax = yCenter+1;
      xEnd++;
      currX = xCenter-1;
      currY = yCenter;
      xDir = 1;
      yDir = 0;
      passedEndXY = 0;
      println("NEXT LEVEL!!!!");
    }
    currX += xDir;
    currY += yDir;
    
    int x = currX +xDir; //wie sähe der nächste schritt aus??
    int y = currY +yDir;
    if (yDir == 1 && y == yCenter+1)
    {
      xMin--;
      xMax++;
      yMin--;
      yMax++;
//#######################      
//      currX = xCenter;
//      currY = yCenter;
//      xDir = 1;
//      yDir = 0;
      println("nächste schicht");
    }
    
    if (x > xMax && y==yCenter && xDir ==1)
    {
      xDir = 0;
      yDir = 1;
    } else
    if (x > xCenter && y > yMax) //ecke rechts unten
    {
      xDir = -1;
      yDir = 0;
    } else
    if (x < xMin && y > yCenter) //ecke links unten
    {
      xDir = 0;
      yDir = -1;
    } else
    if (x < xCenter && y <yMin) //ecke links oben
    {
      xDir = 1;
      yDir = 0;
    } else
    if (x > xMax && y < yCenter) //ecke rechts oben
    {
      xDir = 0;
      yDir = 1;
    }

  }
  
  void printNest()
  {
    println();
    println("currX: "+currX +"  currY: "+currY +"  xMin: "+xMin +"  yMin: "+yMin 
            +"   xEnd: "+ xEnd +"   passedEndXY: " +passedEndXY);
    for (int k=0; k<nestStructure[0].length;k++)
    {
      for (int i=0; i<nestStructure.length; i++)
      {
        print(nestStructure[i][k] +" | ");
      }
      println();
    }
  }
  
}