root/test/manual/etags/cp-src/conway.cpp

DEFINITIONS

1. total_surrounding
2. display
3. glider
4. traffic_light
5. main

     1 /* ======================================================================= */
     2 /*                                CONWAY.CPP                               */
     3 /* ======================================================================= */
     4 
     5 #include "assert.h"
     6 #include "iostream.h"
     7 #include "conio.h"
     8 #include "clheir.h"
     9 #include "screen.h"
    10 #include "conway.h"
    11 
    12 #define max(x,y)  ((x > y) ? x : y)
    13 #define min(x,y)  ((x > y) ? y : x)
    14 
    15 const int num_rows = min(50, NUM_ROWS);
    16 const int num_columns = 40;
    17 
    18 class site *field_of_play[num_rows][num_columns];
    19 
    20 int site::total_surrounding(void)
    21     {
    22     int i, j, imin, imax, jmin, jmax, total;
    23 
    24     total = 0;
    25     imin = max(0, x - 1);
    26     imax = min(num_rows - 1, x + 1);
    27     jmin = max(0, y - 1);
    28     jmax = min(num_columns - 1, y + 1);
    29 
    30     for (i = imin; i <= imax; i++)
    31         for (j = jmin; j <= jmax; j++)
    32             if (field_of_play[i][j]->read()) total++;
    33     if (alive) total--;
    34     return total;
    35     }
    36 
    37 void display(void)
    38     {
    39     int i, j;
    40 
    41     for (i = 0; i < num_rows; i++)
    42         for (j = 0; j < num_columns; j++)
    43             {
    44             if (field_of_play[i][j]->read()) write_xyc(2*j, i, 'X');
    45             else write_xyc(2*j, i, '.');
    46             }
    47     hide_cursor();
    48     }
    49 
    50 void glider(int x, int y)
    51     {
    52     field_of_play[x - 1][y + 0]->set();
    53     field_of_play[x - 1][y + 1]->set();
    54     field_of_play[x + 0][y - 1]->set();
    55     field_of_play[x + 0][y + 0]->set();
    56     field_of_play[x + 1][y + 1]->set();
    57     }
    58 
    59 void traffic_light(int x, int y)
    60     {
    61     field_of_play[x - 1][y]->set();
    62     field_of_play[x + 0][y]->set();
    63     field_of_play[x + 1][y]->set();
    64     }
    65 
    66 
    67 void main(void)
    68     {
    69     int i, j, c;
    70 
    71     init_registry();
    72 
    73     for (i = 0; i < num_rows; i++)
    74         for (j = 0; j < num_columns; j++)
    75             field_of_play[i][j] = new site(i, j);
    76 
    77 start_over:
    78     traffic_light(num_rows/2 - 8, num_columns/2 - 8);
    79     glider(num_rows/2 + 8, num_columns/2 + 8);
    80 
    81     clear_screen();
    82     while (1)
    83         {
    84         display();
    85         if ((c = getch()) == 'q') { clear_screen(); return; }
    86         if (c == 'i')
    87             {
    88             for (i = 0; i < num_rows; i++)
    89                 for (j = 0; j < num_columns; j++)
    90                     field_of_play[i][j]->clear();
    91             goto start_over;
    92             }
    93         step_everybody();
    94         }
    95     }