src/main/java/de/uapcore/sudoku/Field.java

Mon, 27 Jul 2020 12:08:23 +0200

author
Mike Becker <universe@uap-core.de>
date
Mon, 27 Jul 2020 12:08:23 +0200
changeset 15
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parent 12
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child 22
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permissions
-rw-r--r--

fix: window cannot get smaller than the field

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1 /*
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2 * Copyright 2013 Mike Becker. All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * 1. Redistributions of source code must retain the above copyright
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8 * notice, this list of conditions and the following disclaimer.
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9 *
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 *
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14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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17 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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24 * POSSIBILITY OF SUCH DAMAGE.
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25 */
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26
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27 package de.uapcore.sudoku;
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28
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29 import javax.swing.*;
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30 import java.awt.*;
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31 import java.awt.image.BufferedImage;
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32
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33 /**
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34 * A panel rendering the Sudoku field.
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35 * <p>
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36 * Cells are identified by zero-based indices from top-left to bottom-right.
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37 */
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38 public final class Field extends JPanel {
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39 private final SudokuTextField[][] cells;
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40
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41 /**
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42 * Constructs a new 9x9 Sudoku grid.
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43 */
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44 public Field() {
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45 setBackground(Color.WHITE);
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46
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47 setLayout(new GridBagLayout());
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48 GridBagConstraints c = new GridBagConstraints();
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49 c.insets = new Insets(5, 5, 5, 5);
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50
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51 cells = new SudokuTextField[9][9];
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52 for (int x = 0; x < 9; x++) {
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53 for (int y = 0; y < 9; y++) {
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54 cells[x][y] = new SudokuTextField();
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55 c.gridx = x;
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56 c.gridy = y;
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57 add(cells[x][y], c);
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58 }
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59 }
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60 }
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61
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62 /**
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63 * Paints the grid and all contained cells.
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64 *
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65 * @param graphics the graphics context
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66 */
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67 @Override
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68 public void paint(Graphics graphics) {
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69 final int w = getWidth();
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70 final int h = getHeight();
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71 final int cw = w / 9;
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72 final int ch = h / 9;
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73
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74 BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
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75 Graphics2D g = img.createGraphics();
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76 g.setBackground(Color.WHITE);
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77 g.clearRect(0, 0, w, h);
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78
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79 g.setColor(Color.BLACK);
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80 g.drawRect(1, 1, w - 2, h - 2);
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81 g.drawRect(2, 2, w - 4, h - 4);
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82 for (int x = cw; x < w; x += cw) {
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83 for (int y = ch; y < h; y += ch) {
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84 g.drawLine(x, 2, x, h - 2);
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85 g.drawLine(2, y, w - 2, y);
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86 if ((x / cw) % 3 == 0) {
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87 g.drawLine(x + 1, 2, x + 1, h - 2);
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88 }
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89 if ((y / ch) % 3 == 0) {
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90 g.drawLine(2, y + 1, w - 2, y + 1);
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91 }
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92 }
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93 }
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94
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95 graphics.drawImage(img, 0, 0, this);
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96 super.paintChildren(graphics);
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97 }
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98
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99 /**
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100 * Checks whether a cell is empty
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101 *
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102 * @param x horizontal position
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103 * @param y vertical position
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104 * @return true if the cell is empty, false otherwise
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105 */
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106 public boolean isCellEmpty(int x, int y) {
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107 return getCellValue(x, y) == 0;
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108 }
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109
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110 /**
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111 * Returns value of a specific cell.
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112 *
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113 * @param x horizontal position
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114 * @param y vertical position
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115 * @return the cell's value
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116 */
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117 public int getCellValue(int x, int y) {
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118 return cells[x][y].getValue();
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119 }
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120
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121 /**
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122 * Sets the value of a specific cell.
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123 *
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124 * @param x horizontal position
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125 * @param y vertical position
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126 * @param v the cells value
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127 * @throws IllegalArgumentException if v is not between 0 and 9
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128 */
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129 public void setCellValue(int x, int y, int v) {
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130 cells[x][y].setValue(v);
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131 }
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132
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133 /**
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134 * Clears the value of a specific cell.
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135 *
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136 * @param x horizontal position
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137 * @param y vertical position
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138 */
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139 public void clearCellValue(int x, int y) {
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140 setCellValue(x, y, 0);
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141 }
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142
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143 /**
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144 * Sets the modified state of a specific cell.
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145 *
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146 * @param x horizontal position
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147 * @param y vertical position
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148 * @param modified the modified state
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149 */
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150 public void setCellModified(int x, int y, boolean modified) {
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151 cells[x][y].setModified(modified);
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152 }
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153
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154 /**
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155 * Sets the modified state of all cells.
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156 *
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157 * @param modified the modified state
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158 */
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159 public void setAllCellsModified(boolean modified) {
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160 for (int x = 0; x < 9; x++) {
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161 for (int y = 0; y < 9; y++) {
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162 cells[x][y].setModified(modified);
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163 }
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164 }
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165 }
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166
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167 /**
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168 * Checks whether any cell is modified.
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169 *
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170 * @return true if any cell is modified, false otherwise
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171 */
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172 public boolean isAnyCellModified() {
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173 for (int x = 0; x < 9; x++) {
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174 for (int y = 0; y < 9; y++) {
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175 if (cells[x][y].isModified()) {
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176 return true;
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177 }
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178 }
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179 }
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180 return false;
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181 }
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182
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183 /**
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184 * Clears all cells.
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185 */
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186 public void clear() {
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187 for (int x = 0; x < 9; x++) {
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188 for (int y = 0; y < 9; y++) {
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189 cells[x][y].setValue(0);
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190 }
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191 }
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192 }
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193
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194 /**
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195 * Returns a square identified by square coordinates.
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196 * <p>
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197 * Cells within the square are identified by the same coordinate system.
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198 *
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199 * @param x horizontal position from 0 to 2
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200 * @param y vertical position from 0 to 2
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201 * @return a two-dimensional array containing the square cell values
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202 * @throws IllegalArgumentException if the coordinates are out of bounds
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203 */
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204 public int[][] getSquare(int x, int y) {
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205 if (x < 0 || x > 2 || y < 0 || y > 2) {
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206 throw new IllegalArgumentException("Invalid square coordinates");
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207 }
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208 int[][] square = new int[3][3];
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209
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210 for (int u = 0; u < 3; u++) {
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211 for (int v = 0; v < 3; v++) {
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212 square[u][v] = getCellValue(3 * x + u, 3 * y + v);
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213 }
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214 }
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215
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216 return square;
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217 }
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218
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219 /**
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220 * Returns an entire row.
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221 *
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222 * @param y the row position
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223 * @return an array containing the row values
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224 * @throws IllegalArgumentException if y is not between 0 and 8
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225 */
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226 public int[] getRow(int y) {
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227 if (y < 0 || y > 8) {
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228 throw new IllegalArgumentException("Invalid row number");
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229 }
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230 int[] row = new int[9];
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231
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232 for (int x = 0; x < 9; x++) {
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233 row[x] = getCellValue(x, y);
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234 }
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235
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236 return row;
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237 }
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238
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239 /**
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240 * Returns an entire column
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241 *
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242 * @param x the column position
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243 * @return an array containing the column values
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244 * @throws IllegalArgumentException if x is not between 0 and 8
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245 */
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246 public int[] getColumn(int x) {
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247 if (x < 0 || x > 8) {
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248 throw new IllegalArgumentException("Invalid column number");
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249 }
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250 int[] column = new int[9];
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251
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252 for (int y = 0; y < 9; y++) {
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253 column[y] = getCellValue(x, y);
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254 }
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255
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256 return column;
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257 }
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258 }

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