diff -r e70a0e3555fb -r 576e7a2861ae src/de/uapcore/sudoku/Field.java
--- a/src/de/uapcore/sudoku/Field.java	Fri Feb 01 10:18:47 2013 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,182 +0,0 @@
-/*
- * Copyright 2013 Mike Becker. All rights reserved.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * 
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-package de.uapcore.sudoku;
-
-import java.awt.Color;
-import java.awt.Graphics;
-import java.awt.Graphics2D;
-import java.awt.GridBagConstraints;
-import java.awt.GridBagLayout;
-import java.awt.Insets;
-import java.awt.image.BufferedImage;
-import javax.swing.JPanel;
-
-/**
- *
- * @author mike
- */
-public final class Field extends JPanel {
-    private SudokuTextField[][] cells;
-    
-    public Field() {
-        setBackground(Color.WHITE);
-        
-        setLayout(new GridBagLayout());
-        GridBagConstraints c = new GridBagConstraints();
-        c.insets = new Insets(5, 5, 5, 5);
-        
-        cells = new SudokuTextField[9][9];
-        for (int x = 0 ; x < 9 ; x++) {
-            for (int y = 0 ; y < 9 ; y++) {
-                cells[x][y] = new SudokuTextField();
-                c.gridx = x;
-                c.gridy = y;
-                add(cells[x][y], c);
-            }
-        }
-    }
-
-    @Override
-    public void paint(Graphics graphics) {
-        final int w = getWidth();
-        final int h = getHeight();
-        final int cw = w / 9;
-        final int ch = h / 9;
-        
-        BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
-        Graphics2D g = img.createGraphics();
-        g.setBackground(Color.WHITE);
-        g.clearRect(0, 0, w, h);
-        
-        g.setColor(Color.BLACK);
-        g.drawRect(1, 1, w-2, h-2);
-        g.drawRect(2, 2, w-4, h-4);
-        for (int x = cw ; x < w ; x += cw) {
-            for (int y = ch ; y < h ; y += ch) {
-                g.drawLine(x, 2, x, h-2);
-                g.drawLine(2, y, w-2, y);
-                if ((x / cw) % 3 == 0) {
-                    g.drawLine(x+1, 2, x+1, h-2);
-                }
-                if ((y / ch) % 3 == 0) {
-                    g.drawLine(2, y+1, w-2, y+1);
-                }
-            }
-        }
-        
-        graphics.drawImage(img, 0, 0, this);
-        super.paintChildren(graphics);
-    }
-    
-    public boolean isCellEmpty(int x, int y) {
-        return getCellValue(x, y) == 0;
-    }
-    
-    public int getCellValue(int x, int y) {
-        return cells[x][y].getValue();
-    }
-    
-    public void setCellValue(int x, int y, int v) {
-        cells[x][y].setValue(v);
-    }
-    
-    public void clearCellValue(int x, int y) {
-        setCellValue(x, y, 0);
-    }
-    
-    public void setCellModified(int x, int y, boolean modified) {
-        cells[x][y].setModified(modified);
-    }
-    
-    public void setAllCellsModified(boolean modified) {
-        for (int x = 0 ; x < 9 ; x++) {
-            for (int y = 0 ; y < 9 ; y++) {
-                cells[x][y].setModified(modified);
-            }
-        }
-    }
-    
-    public boolean isAnyCellModified() {
-        for (int x = 0 ; x < 9 ; x++) {
-            for (int y = 0 ; y < 9 ; y++) {
-                if (cells[x][y].isModified()) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-    
-    public void clear() {
-        for (int x = 0 ; x < 9 ; x++) {
-            for (int y = 0 ; y < 9 ; y++) {
-                cells[x][y].setValue(0);
-            }
-        }
-    }
-    
-    public int[][] getSquare(int x, int y) {
-        if (x < 0 || x > 2 || y < 0 || y > 2) {
-            throw new IllegalArgumentException("Invalid square coordinates");
-        }
-        int[][] square = new int[3][3];
-        
-        for (int u = 0 ; u < 3 ; u++) {
-            for (int v = 0 ; v < 3 ; v++) {
-                square[u][v] = getCellValue(3*x+u, 3*y+v);
-            }
-        }
-        
-        return square;
-    }
-    
-    public int[] getRow(int y) {
-        if (y < 0 || y > 8) {
-            throw new IllegalArgumentException("Invalid row number");
-        }
-        int row[] = new int[9];
-        
-        for (int x = 0 ; x < 9 ; x++) {
-            row[x] = getCellValue(x, y);
-        }
-        
-        return row;
-    }
-    
-    public int[] getColumn(int x) {
-        if (x < 0 || x > 8) {
-            throw new IllegalArgumentException("Invalid column number");
-        }
-        int column[] = new int[9];
-        
-        for (int y = 0 ; y < 9 ; y++) {
-            column[y] = getCellValue(x, y);
-        }
-        
-        return column;
-    }
-}