Tidying up
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conway.c
83
conway.c
@ -1,35 +1,28 @@
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// A console conway's game of life program by Bruce Hill
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// Released under the MIT license, see LICENSE for details.
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// This file contains the main code for the table viewer.
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <termbox.h>
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#include <unistd.h>
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static char survive[9] = {0,0,1,1,0,0,0,0,0};
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static char birth[9] = {0,0,0,1,0,0,0,0,0};
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#define CELL(cells, x, y) cells[((y) % H)*W + ((x) % W)]
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static char rules[2][9] = {{0,0,0,1,0,0,0,0,0}, {0,0,1,1,0,0,0,0,0}};
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static int W, H;
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static void update(const char *cells, char *future_cells)
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{
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int W = tb_width()/2, H = tb_height();
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for (int y = 0; y < H; y++) {
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for (int x = 0; x < W; x++) {
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int neighbors = (
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cells[(y-1 % H)*W + (x-1 % W)] +
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cells[(y-1 % H)*W + (x % W)] +
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cells[(y-1 % H)*W + (x+1 % W)] +
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cells[y*W + (x-1 % W)] +
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cells[y*W + (x+1 % W)] +
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cells[(y+1 % H)*W + (x-1 % W)] +
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cells[(y+1 % H)*W + (x % W)] +
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cells[(y+1 % H)*W + (x+1 % W)]
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);
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future_cells[y*W + x] = cells[y*W + x] ? survive[neighbors] : birth[neighbors];
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if (future_cells[y*W + x] != cells[y*W + x]) {
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tb_change_cell(2*x, y, ' ', 0, future_cells[y*W + x] ? 8 : 0);
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tb_change_cell(2*x+1, y, ' ', 0, future_cells[y*W + x] ? 8 : 0);
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int neighbors =
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CELL(cells,x-1,y-1) + CELL(cells,x,y-1) + CELL(cells,x+1,y-1)
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+ CELL(cells,x-1,y) + CELL(cells,x+1,y)
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+ CELL(cells,x-1,y+1) + CELL(cells,x,y+1) + CELL(cells,x+1,y+1);
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CELL(future_cells, x, y) = rules[CELL(cells, x, y)][neighbors];
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if (CELL(future_cells, x, y) != CELL(cells, x, y)) {
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tb_change_cell(2*x, y, ' ', 0, CELL(future_cells, x, y) ? 8 : 0);
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tb_change_cell(2*x+1, y, ' ', 0, CELL(future_cells, x, y) ? 8 : 0);
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}
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}
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}
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@ -41,16 +34,16 @@ int main(int argc, char **argv) {
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printf("Conway's Game of Life Viewer\nUsage: conway [-S012345678] [-B012345678]\n");
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return 0;
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} else if (strncmp(argv[i], "-B", 2) == 0) {
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memset(birth, 0, sizeof(birth));
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memset(rules[0], 0, sizeof(rules[0]));
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for (char *p = &argv[i][2]; *p; p++) {
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if ('0' <= *p && *p <= '8')
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birth[*p - '0'] = 1;
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rules[0][*p - '0'] = 1;
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}
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} else if (strncmp(argv[i], "-S", 2) == 0) {
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memset(survive, 0, sizeof(survive));
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memset(rules[1], 0, sizeof(rules[1]));
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for (char *p = &argv[i][2]; *p; p++) {
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if ('0' <= *p && *p <= '8')
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survive[*p - '0'] = 1;
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rules[1][*p - '0'] = 1;
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}
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}
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}
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@ -62,54 +55,52 @@ int main(int argc, char **argv) {
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}
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tb_select_input_mode(TB_INPUT_MOUSE);
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int flipflop = 0;
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// Cells are 2 characters wide so they look square
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int W = tb_width()/2, H = tb_height();
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char *buffers[2];
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int flipflop = 0;
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resize:
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W = tb_width()/2, H = tb_height();
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buffers[0] = calloc(W*H, sizeof(char));
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buffers[1] = calloc(W*H, sizeof(char));
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for (int x = 0; x < W; x++) {
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for (int y = 0; y < H; y++) {
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buffers[flipflop][y*W+x] = random() % 2;
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}
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}
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for (int x = 0; x < W; x++)
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for (int y = 0; y < H; y++)
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CELL(buffers[flipflop], x, y) = random() % 2;
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int draw_mode = 1;
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tb_clear();
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while (1) {
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update(buffers[flipflop], buffers[!flipflop]);
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flipflop = !flipflop;
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present:
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tb_present();
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usleep(60000);
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struct tb_event ev;
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int drew = 0;
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while (tb_peek_event(&ev, 0)) {
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switch (ev.type) {
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case TB_EVENT_RESIZE:
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W = ev.w/2, H = ev.h;
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free(buffers[0]);
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free(buffers[1]);
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goto resize;
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case TB_EVENT_KEY:
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switch (ev.key) {
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case TB_KEY_ESC:
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if (tb_peek_event(&ev, 50) == 0)
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goto done;
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else break;
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}
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switch (ev.ch) {
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case 'q':
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goto done;
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}
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if (ev.key == TB_KEY_ESC && tb_peek_event(&ev, 50) == 0)
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goto done;
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else if (ev.ch == 'q')
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goto done;
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else if (ev.key == TB_KEY_SPACE)
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draw_mode = !draw_mode;
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break;
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case TB_EVENT_MOUSE:
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buffers[flipflop][ev.y*W + ev.x/2] = !buffers[flipflop][ev.y*W + ev.x/2];
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tb_change_cell(2*(ev.x/2), ev.y, ' ', 0, buffers[flipflop][ev.y*W + ev.x/2] ? 8 : 0);
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tb_change_cell(2*(ev.x/2)+1, ev.y, ' ', 0, buffers[flipflop][ev.y*W + ev.x/2] ? 8 : 0);
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tb_present();
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usleep(10000);
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CELL(buffers[flipflop], ev.x/2, ev.y) = draw_mode;
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tb_change_cell(2*(ev.x/2), ev.y, ' ', 0, draw_mode ? 8 : 0);
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tb_change_cell(2*(ev.x/2)+1, ev.y, ' ', 0, draw_mode ? 8 : 0);
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drew = 1;
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break;
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}
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}
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if (drew) goto present;
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}
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done:
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tb_shutdown();
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