/*
         * Diese Methode erzeugt 16 PictureBoxen samt Click-Event.
         * Desweiteren zerteilt sie das original Bild in 16 images für 16 PTs und die 16 PictureBoxen.
         */
        private void splitImagesToPicBoxes()
        {
            if (picBoxWhole != null)
            {
                PuzzleBox.Controls.Remove(picBoxWhole);
                picBoxWhole.Dispose();
                picBoxWhole = null;
            }
            if (picBoxes == null)
            {
                PT = new PuzzleTile[BOX_NUM];
                picBoxes = new PictureBox[BOX_NUM];
            }
            int numRow = 4;
            int numCol = 4;
            int unitX = PuzzleBox.Width / numRow;
            int unitY = PuzzleBox.Height / numCol;
            int[] indice = new int[BOX_NUM];
            for (int i = 0; i < BOX_NUM; i++)
            {
                indice[i] = i;
                if (picBoxes[i] == null)
                {
                    picBoxes[i] = new PictureBox();
                    picBoxes[i].BorderStyle = BorderStyle.Fixed3D;
                    picBoxes[i].Click += new EventHandler(picBoxes_click);
                }

                picBoxes[i].Width = unitX;
                picBoxes[i].Height = unitY;

                PT[i] = new PuzzleTile();
                PT[i].ID= i;
                PT[i].PuzzleTileImage = CreateBitmapImage(image,i, numRow, numCol, unitX, unitY);
                picBoxes[i].Image = PT[i].PuzzleTileImage;
                picBoxes[i].Location = new Point(unitX * (i % numCol), unitY * (i / numCol));

                PuzzleBox.Controls.Add(picBoxes[i]);
            }
        }
        /*
         * Diese Methode synchronisiert die PTs mit den Items.
         * Sowie die Images der PTs mit den Images der PictureBoxen.
         */
        private void fitPTtoItems()
        {
            PuzzleTile dummyTile = PT[15];
            PuzzleTile[] dummy = new PuzzleTile[BOX_NUM];

            for (int i = 0; i < 16; i++)
            {
                for (int j = 0; j < 16; j++)
                {
                    if (game.items[i] == PT[j].ID)
                    {
                        dummy[i] = PT[j];
                    }
                }

            }
            PT = dummy;
            for (int i = 0; i<16; i++)
            {
                picBoxes[i].Image = PT[i].PuzzleTileImage;
            }
        }