1 | /* |
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2 | * conio-snake snake game using the <conio.h> API |
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3 | * Copyright (c) 2003-2004 Simon Huggins <webmaster#simonhuggins.com> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * Permission to use, copy, modify, and/or distribute this software for any |
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7 | * purpose with or without fee is hereby granted, provided that the above |
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8 | * copyright notice and this permission notice appear in all copies. |
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9 | * |
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10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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17 | */ |
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18 | |
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19 | #include <stdlib.h> |
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20 | #include <stdio.h> |
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21 | #include <caca_conio.h> |
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22 | |
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23 | /* prototypes */ |
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24 | void draw_line(int col, int row); |
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25 | void show_score(); |
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26 | void add_segment(); |
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27 | void setup_level(); |
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28 | |
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29 | /* constants */ |
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30 | const int maxrow=15, maxcol=77; |
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31 | const int snake_start_col=33,snake_start_row=7; |
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32 | const char up_key='a', down_key='z', left_key='o', right_key='p'; |
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33 | const int pause_length=500000; |
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34 | |
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35 | /* global variables */ |
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36 | int score, snake_length, speed, obstacles, level, firstpress, high_score=0; |
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37 | char screen_grid[maxrow][maxcol]; |
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38 | char direction = right_key; |
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39 | struct snake_segment { |
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40 | int row,col; |
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41 | } snake[100]; |
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42 | |
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43 | int main() |
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44 | { |
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45 | |
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46 | /* Variable declarations within main() only */ |
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47 | char keypress; |
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48 | |
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49 | do /* restart game loop */ |
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50 | { |
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51 | obstacles=4; level=1; score=0; speed=14; |
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52 | |
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53 | //randomize(); /* Ensure random seed initiated */ |
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54 | |
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55 | setup_level(); |
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56 | |
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57 | /* main loop */ |
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58 | do |
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59 | { |
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60 | delay(speed * pause_length / 50000); /*pause*/ |
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61 | |
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62 | /* If key has been hit, then check it is a direction key - if so, |
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63 | change direction */ |
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64 | if (kbhit()) |
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65 | { |
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66 | keypress=(char)getch(); |
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67 | if((keypress==right_key)||(keypress==left_key)|| |
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68 | (keypress==up_key)||(keypress==down_key)) |
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69 | direction = keypress; |
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70 | } |
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71 | |
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72 | /* Add a segment to the end of the snake */ |
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73 | add_segment(); |
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74 | |
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75 | /* Blank last segment of snake */ |
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76 | gotoxy(snake[0].col,snake[0].row); |
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77 | cprintf(" "); |
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78 | /* ... and remove it from the array */ |
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79 | for (int i=1;i<=snake_length;i++) |
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80 | snake[i-1]=snake[i]; |
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81 | /* Display snake in yellow */ |
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82 | textcolor(YELLOW); |
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83 | for (int i=0;i<=snake_length;i++) |
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84 | { |
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85 | gotoxy(snake[i].col,snake[i].row); |
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86 | cprintf("O"); |
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87 | } |
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88 | /* keeps cursor flashing in one place instead of following snake */ |
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89 | gotoxy(1,1); |
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90 | |
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91 | /* If first press on each level, pause until a key is pressed */ |
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92 | if (firstpress) { while(!kbhit()); firstpress = 0; } |
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93 | |
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94 | /* Collision detection - walls (bad!) */ |
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95 | if ((snake[snake_length-1].row>maxrow+1)||(snake[snake_length-1].row<=1)|| |
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96 | (snake[snake_length-1].col>maxcol+1)||(snake[snake_length-1].col<=1)|| |
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97 | /* Collision detection - obstacles (bad!) */ |
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98 | (screen_grid[snake[snake_length-1].row-2][snake[snake_length-1].col-2]=='x')) |
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99 | keypress='x'; /* i.e. exit loop - game over */ |
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100 | /* Collision detection - snake (bad!) */ |
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101 | for (int i=0;i<snake_length-1;i++) |
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102 | if ( (snake[snake_length-1].row)==(snake[i].row) && |
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103 | (snake[snake_length-1].col)==(snake[i].col)) |
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104 | { |
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105 | keypress='x'; /* i.e. exit loop - game over */ |
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106 | break; /* no need to check any more segments */ |
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107 | } |
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108 | /* Collision detection - food (good!) */ |
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109 | if (screen_grid[snake[snake_length-1].row-2][snake[snake_length-1].col-2]=='.') |
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110 | { |
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111 | /* increase score and length of snake */ |
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112 | score+=snake_length*obstacles; show_score(); snake_length++; add_segment(); |
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113 | /* if length of snake reaches certain size, onto next level */ |
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114 | if (snake_length==(level+3)*2) |
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115 | { |
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116 | score+=level*1000; obstacles+=2; level++; /* add to obstacles */ |
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117 | if ((level%5==0)&&(speed>1)) speed--; /* increase speed every 5 levels */ |
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118 | setup_level(); /* display next level */ |
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119 | } |
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120 | } |
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121 | } while (keypress!='x'); |
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122 | |
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123 | /* game over message */ |
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124 | if (score > high_score) high_score = score; |
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125 | show_score(); |
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126 | gotoxy(30,6); textcolor(LIGHTRED); cprintf("G A M E O V E R"); |
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127 | gotoxy(30,9); textcolor(YELLOW); cprintf("Another Game (y/n)? "); |
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128 | do keypress=getch(); while((keypress!='y')&&(keypress!='n')); |
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129 | |
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130 | } while (keypress=='y'); |
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131 | } |
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132 | |
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133 | void setup_level() |
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134 | { |
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135 | |
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136 | /* variables local to setup_level() */ |
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137 | int row,col; |
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138 | |
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139 | /* Set up global variables for new level */ |
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140 | snake_length=level+4; direction = right_key; |
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141 | firstpress = 1; |
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142 | /* Fill grid with blanks */ |
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143 | for(row=0;row<maxrow;row++) |
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144 | for(col=0;col<maxcol;col++) |
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145 | screen_grid[row][col]= ' '; |
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146 | |
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147 | /* Fill grid with Xs and food */ |
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148 | for(int i=0;i<obstacles*2;i++) |
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149 | { |
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150 | row= rand()%maxrow; |
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151 | col= rand()%maxcol; |
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152 | if(i<obstacles) |
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153 | screen_grid[row][col]='x'; |
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154 | else |
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155 | screen_grid[row][col]='.'; |
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156 | } |
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157 | |
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158 | /* Create snake array of length snake_length */ |
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159 | for(int i=0;i<snake_length;i++) |
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160 | { |
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161 | snake[i].row=snake_start_row; |
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162 | snake[i].col=snake_start_col+i; |
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163 | } |
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164 | |
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165 | /* Draw playing board */ |
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166 | draw_line(1,1); |
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167 | for(row=0;row<maxrow;row++) |
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168 | { |
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169 | gotoxy(1,row+2); |
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170 | textcolor(LIGHTBLUE); cprintf("|"); |
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171 | textcolor(WHITE); |
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172 | for(col=0;col<maxcol;col++) |
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173 | cprintf("%c",screen_grid[row][col]); |
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174 | textcolor(LIGHTBLUE); |
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175 | cprintf("|"); |
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176 | } |
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177 | draw_line(1,maxrow+2); |
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178 | |
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179 | show_score(); |
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180 | gotoxy(2,maxrow+5); |
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181 | textcolor(LIGHTRED); |
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182 | cprintf("~~ SNAKE GAME~~ Left: %c, Right: %c, Up: %c, Down: %c, Exit: x. Any key to start.", |
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183 | left_key,right_key,up_key,down_key); |
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184 | } |
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185 | |
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186 | void draw_line(int col, int row) |
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187 | { |
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188 | gotoxy(col,row); textcolor(LIGHTBLUE); |
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189 | for (col=0;col<maxcol+2;col++) cprintf("="); |
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190 | } |
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191 | |
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192 | void show_score() |
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193 | { |
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194 | textcolor(LIGHTCYAN); |
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195 | gotoxy(2,maxrow+3); |
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196 | cprintf("Level: %05d",level); |
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197 | gotoxy(40,maxrow+3); |
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198 | textcolor(LIGHTGREEN); |
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199 | cprintf("Score: %05d",score); |
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200 | gotoxy(60,maxrow+3); |
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201 | textcolor(LIGHTMAGENTA); |
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202 | cprintf("High Score: %05d",high_score); |
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203 | } |
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204 | void add_segment() |
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205 | { |
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206 | switch(direction) |
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207 | { |
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208 | case(right_key): snake[snake_length].row=snake[snake_length-1].row; |
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209 | snake[snake_length].col=snake[snake_length-1].col+1; |
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210 | break; |
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211 | case(left_key) : snake[snake_length].row=snake[snake_length-1].row; |
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212 | snake[snake_length].col=snake[snake_length-1].col-1; |
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213 | break; |
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214 | case(up_key) : snake[snake_length].row=snake[snake_length-1].row-1; |
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215 | snake[snake_length].col=snake[snake_length-1].col; |
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216 | break; |
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217 | case(down_key) : snake[snake_length].row=snake[snake_length-1].row+1; |
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218 | snake[snake_length].col=snake[snake_length-1].col; |
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219 | } |
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220 | } |
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221 | |
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