Mercurial > projects > rantaiwarna
annotate board.c @ 6:1d7143a612e1
Release version 2
author | Guido Berhoerster <guido+rantaiwarna@berhoerster.name> |
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date | Mon, 17 Nov 2014 12:37:05 +0100 |
parents | aec74ae4d6e5 |
children | 4f6bf50dbc4a |
rev | line source |
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0
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1 /* |
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2 * Copyright (C) 2014 Guido Berhoerster <guido+rantaiwarna@berhoerster.name> |
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3 * |
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4 * Permission is hereby granted, free of charge, to any person obtaining |
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5 * a copy of this software and associated documentation files (the |
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6 * "Software"), to deal in the Software without restriction, including |
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7 * without limitation the rights to use, copy, modify, merge, publish, |
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8 * distribute, sublicense, and/or sell copies of the Software, and to |
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9 * permit persons to whom the Software is furnished to do so, subject to |
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10 * the following conditions: |
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11 * |
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12 * The above copyright notice and this permission notice shall be included |
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13 * in all copies or substantial portions of the Software. |
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14 * |
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
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18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
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19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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22 */ |
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23 |
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24 #define _XOPEN_SOURCE 600 |
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25 |
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26 #include <stdlib.h> |
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27 #include <unistd.h> |
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28 #include <curses.h> /* for OK, ERR */ |
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29 |
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30 #include "board.h" |
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31 #include "compat.h" |
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32 #include "util.h" |
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33 |
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34 struct stack_element { |
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35 struct stack_element *next; |
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36 int x; |
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37 int y; |
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38 }; |
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39 |
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40 struct board_ctx * |
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41 board_create(int height, int width, short colors) |
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42 { |
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43 struct board_ctx *board; |
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44 |
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45 board = rantaiwarna_malloc(sizeof (struct board_ctx)); |
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46 board->elements = rantaiwarna_calloc((size_t)(width * height), |
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47 sizeof (short)); |
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48 board->seed = (uint32_t)getpid(); |
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49 board->height = height; |
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50 board->width = width; |
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51 board->colors = colors; |
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52 board->status = GAME_OVER; |
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53 board->score = 0; |
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54 if (board_generate(board) == ERR) { |
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55 board_free(board); |
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56 return (NULL); |
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57 } |
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58 |
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59 return (board); |
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60 } |
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61 |
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62 void |
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63 board_free(struct board_ctx *board) |
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64 { |
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65 free(board->elements); |
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66 free(board); |
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67 } |
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68 |
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69 int |
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70 board_check_status(struct board_ctx *board) |
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71 { |
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72 int status = GAME_OVER | GAME_OVER_CLEARED; |
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73 int y; |
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74 int x; |
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75 |
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76 for (y = board->height - 1; y >= 0; y--) { |
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77 for (x = 0; x < board->width; x++) { |
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78 if (board->elements[y * board->width + x] != 0) { |
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79 status &= ~GAME_OVER_CLEARED; |
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80 if (((y - 1 >= 0) && |
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81 (board->elements[y * board->width + x] == |
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82 board->elements[(y - 1) * board->width + |
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83 x])) || |
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84 ((x + 1 < board->width) && |
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85 (board->elements[y * board->width + x] == |
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86 (board->elements[y * board->width + x + |
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87 1])))) { |
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88 status &= ~GAME_OVER; |
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89 goto out; |
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90 } |
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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 out: |
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96 board->status = status; |
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97 return (status); |
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98 } |
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99 |
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100 int |
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101 board_generate(struct board_ctx *board) |
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102 { |
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103 int i; |
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104 int j; |
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105 |
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106 /* make up to 1000 attempts to create a board that is playable */ |
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107 for (i = 0; i < 1000; i++) { |
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108 for (j = 0; j < board->width * board->height; j++) { |
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109 board->elements[j] = |
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110 (short)(rantaiwarna_rand(&board->seed) % |
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111 board->colors) + 1; |
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112 } |
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113 if (!(board_check_status(board) & GAME_OVER)) { |
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114 break; |
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115 } |
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116 } |
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117 |
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118 board->score = 0; |
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119 |
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120 return (!(board->status & GAME_OVER) ? OK : ERR); |
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121 } |
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122 |
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123 int |
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124 board_compact(struct board_ctx *board) |
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125 { |
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126 int changes = 0; |
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127 int x; |
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128 int y; |
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129 int top; |
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130 int left; |
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131 |
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132 /* close vertical gaps iby moving elements down */ |
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133 for (x = 0; x < board->width; x++) { |
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134 for (y = top = board->height - 1; y >= 0; y--) { |
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135 if (board->elements[y * board->width + x] != 0) { |
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136 board->elements[top * board->width + x] = |
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137 board->elements[y * board->width + x]; |
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138 top--; |
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139 changes++; |
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140 } |
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141 } |
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142 for (y = top; y >= 0; y--) { |
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143 board->elements[y * board->width + x] = 0; |
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144 } |
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145 } |
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146 |
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147 /* close column gaps by moving columns to the left */ |
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148 for (x = left = 0; x < board->width; x++) { |
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149 if (board->elements[(board->height - 1) * board->width + x] != |
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150 0) { |
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151 if (x > left) { |
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152 for (y = 0; y < board->height; y++) { |
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153 board->elements[y * board->width + |
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154 left] = board->elements[y * |
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155 board->width + x]; |
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156 } |
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157 changes++; |
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158 } |
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159 left++; |
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160 } |
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161 } |
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162 for (x = left; x < board->width; x++) { |
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163 for (y = 0; y < board->height; y++) { |
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164 board->elements[y * board->width + x] = 0; |
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165 } |
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166 } |
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167 |
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168 return (changes); |
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169 } |
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170 |
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171 int |
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172 board_remove_elements(struct board_ctx *board, int start_y, int start_x) |
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173 { |
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174 int removed = 0; |
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175 int color; |
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176 int x; |
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177 int y; |
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178 int west; |
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179 int east; |
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180 int n = 0; |
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181 int i; |
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182 int save_x; |
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183 int save_y; |
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184 struct stack_element *stack_start; |
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185 struct stack_element *stack_tmp; |
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186 struct stack_element *stack_new; |
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187 |
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188 color = board->elements[start_y * board->width + start_x]; |
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189 if (color == 0) { |
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190 return (0); |
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191 } |
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192 |
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193 stack_new = rantaiwarna_malloc(sizeof (struct stack_element)); |
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194 stack_new->next = NULL; |
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195 stack_new->y = start_y; |
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196 stack_new->x = start_x; |
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197 stack_start = stack_new; |
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198 |
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199 while (stack_start != NULL) { |
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200 x = stack_start->x; |
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201 y = stack_start->y; |
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202 stack_tmp = stack_start; |
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203 stack_start = stack_start->next; |
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204 free(stack_tmp); |
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205 |
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206 if (board->elements[y * board->width + x] != color) { |
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207 continue; |
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208 } |
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209 |
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210 for (west = x; (west - 1 >= 0) && |
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211 (board->elements[y * board->width + west - 1] == color); |
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212 west--); |
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213 for (east = x; (east + 1 < board->width) && |
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214 (board->elements[y * board->width + east + 1] == color); |
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215 east++); |
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216 for (i = west; i <= east; i++) { |
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217 /* |
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218 * only really start removing elements if there are |
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219 * more than two adjacent elements of the same color |
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220 */ |
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221 n++; |
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222 if (n < 2) { |
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223 save_x = i; |
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224 save_y = y; |
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225 } else { |
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226 if (n == 2) { |
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227 board->elements[save_y * board->width + |
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228 save_x] = 0; |
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229 removed++; |
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230 } |
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231 board->elements[y * board->width + i] = 0; |
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232 removed++; |
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233 } |
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234 |
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235 if ((y - 1 >= 0) && |
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236 (board->elements[(y - 1) * board->width + i] == |
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237 color)) { |
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238 stack_new = rantaiwarna_malloc( |
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239 sizeof (struct stack_element)); |
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240 stack_new->next = stack_start; |
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241 stack_new->y = y - 1; |
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242 stack_new->x = i; |
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243 stack_start = stack_new; |
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244 } |
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245 if ((y + 1 < board->height) && |
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246 (board->elements[(y + 1) * board->width + i] == |
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247 color)) { |
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248 stack_new = rantaiwarna_malloc( |
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249 sizeof (struct stack_element)); |
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250 stack_new->next = stack_start; |
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251 stack_new->y = y + 1; |
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252 stack_new->x = i; |
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253 stack_start = stack_new; |
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254 } |
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255 } |
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256 } |
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257 if (removed > 0) { |
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258 board_compact(board); |
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259 board->score += (removed - 1) * (removed - 1); |
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260 board_check_status(board); |
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261 if (board->status & GAME_OVER) { |
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262 if (board->status & GAME_OVER_CLEARED) { |
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263 board->score += 1000; |
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264 } |
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265 } |
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266 } |
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267 |
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268 return (removed); |
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269 } |