tick.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include "tick.h"
   4
   5 int gol_tick(struct gol_board *state)
   6 {
   7         struct gol_board tmp_state;
   8         char is_live;
   9         unsigned char n_live_adj;
  10         int i, j;
  11
  12         tmp_state = (struct gol_board ) {
  13                 .live_cells = malloc(10 * sizeof(int_least32_t)),
  14                 .n = 0,
  15                 .size = 10,
  16                 .max_x = 0,
  17                 .min_x = 0,
  18                 .max_y = 0,
  19                 .min_y = 0
  20         };
  21
  22         if (!tmp_state.live_cells) {
  23                 return 0;
  24         }
  25
  26         for (i = state->min_x - 1; i <= state->max_x + 1; ++i) {
  27                 for (j = state->min_y - 1; j <= state->max_y + 1; ++j) {
  28                         n_live_adj = 0;
  29                         gol_is_live(state, i - 1, j - 1, &is_live);
  30                         n_live_adj += is_live;
  31                         gol_is_live(state, i, j - 1, &is_live);
  32                         n_live_adj += is_live;
  33                         gol_is_live(state, i + 1, j - 1, &is_live);
  34                         n_live_adj += is_live;
  35                         gol_is_live(state, i - 1, j, &is_live);
  36                         n_live_adj += is_live;
  37                         gol_is_live(state, i + 1, j, &is_live);
  38                         n_live_adj += is_live;
  39                         gol_is_live(state, i - 1 , j + 1, &is_live);
  40                         n_live_adj += is_live;
  41                         gol_is_live(state, i, j + 1, &is_live);
  42                         n_live_adj += is_live;
  43                         gol_is_live(state, i + 1, j + 1, &is_live);
  44                         n_live_adj += is_live;
  45
  46                         switch (n_live_adj) {
  47                         case (3):
  48                                 if(!gol_vivify(&tmp_state, i, j)) {
  49                                         return 0;
  50                                 }
  51
  52                                 break;
  53                         case(2):
  54                                 if (gol_is_live(state, i, j, &is_live) && is_live) {
  55                                         gol_vivify(&tmp_state, i, j);
  56                                 }
  57                                 break;
  58                         default:
  59                                 break;
  60                         }
  61                 }
  62         }
  63         free(state->live_cells);
  64         *state = tmp_state;
  65         return 1;
  66 }