added game of life

src/conway.c

@@ -0,0 +1,137 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+
+/* configuration */
+#define CELL_CHAR '#'
+#define CURSOR_CHAR 'X'
+#define WIDTH 80
+#define HEIGHT 24
+#define ESC 27
+#define FRAME_RATE 5
+
+void clear_screen() {
+	printf("%c[2J", ESC);
+}
+
+void set_cursor(int row, int col) {
+	printf("%c[%d;%dH", ESC, row, col);
+}
+
+void clean_world(uint8_t world[WIDTH][HEIGHT]) {
+	size_t a, b;
+
+	for (a = 0; a < WIDTH; a++) {
+		for (b = 0; b < HEIGHT; b++) {
+			world[a][b] = 0;
+		}
+	}
+}
+
+void inhabit_world(uint8_t pattern[3][3], size_t x, size_t y, uint8_t world[WIDTH][HEIGHT]) {
+	size_t a, b;
+
+	for (a = 0; a < 3; a++) {
+		for (b = 0; b < 3; b++) {
+			world[x+b][y+a] = pattern[a][b];
+		}
+	}
+}
+
+uint8_t calc_cell_neighbours(size_t x, size_t y, uint8_t world[WIDTH][HEIGHT]) {
+	uint8_t neighbours = 0;
+	int8_t a, b;
+
+	for (a = x-1; a <= x+1; a++) {
+		for (b = y-1; b <= y+1; b++) {
+			if (a >= 0 && b >= 0 && a != x && b != y && world[a][b] > 0) {
+				neighbours++;
+			}
+		}
+	}
+
+	return neighbours;
+}
+
+uint8_t calc_next_cell_gen(size_t x, size_t y, uint8_t world[WIDTH][HEIGHT]) {
+	uint8_t neighbours = calc_cell_neighbours(x, y, world);
+
+	if (neighbours < 2) {
+		return 0;
+	}
+	else if (neighbours > 3) {
+		return 0;
+	}
+	else if (neighbours == 2 || neighbours == 3) {
+		return 1;
+	}
+	else {
+		return -1;
+	}
+}
+
+void calc_next_gen(uint8_t world[WIDTH][HEIGHT]) {
+	uint8_t next_gen[WIDTH][HEIGHT];
+	size_t x, y;
+
+	clean_world(next_gen);
+
+	for (x = 0; x < WIDTH; x++) {
+		for (y = 0; y < HEIGHT; y++) {
+			next_gen[x][y] = calc_next_cell_gen(x, y, world);
+		}
+	}
+
+	memcpy(world, next_gen, WIDTH*HEIGHT);
+}
+
+void print_world(uint8_t world[WIDTH][HEIGHT]) {
+	size_t x, y;
+
+	/* reset cursor */
+	set_cursor(0, 0);
+
+	for (y = 0; y < HEIGHT; y++) {
+		for (x = 0; x < WIDTH; x++) {
+			/*printf("%c", (world[x][y]) ? CELL_CHAR : ' ');*/
+			printf("%d,", (world[x][y] != 0) ? (int) world[x][y] : ' ');
+		}
+		printf("\n");  /* new line */
+	}
+
+	for (y = 0; y < HEIGHT; y++) {
+		printf("|");
+		for (x = 0; x < WIDTH; x++) {
+			printf("%c", (world[x][y]) ? CELL_CHAR : ' ');
+		}
+		printf("|\n");  /* new line */
+	}
+}
+
+/* start pattern */
+uint8_t glider[3][3] =  {
+	{0, 1, 0},
+	{0, 0, 1},
+	{1, 1, 1}
+};
+
+int main(int argc, char * argv[]) {
+	uint8_t world[WIDTH][HEIGHT];
+	int counter = 0;
+
+	clean_world(world);  /* initialize world */
+	inhabit_world(glider, WIDTH/2, HEIGHT/2, world);  /* inhabit world */
+	clear_screen();
+print_world(world);
+
+	/* simulation loop */
+	while(0) {
+		calc_next_gen(world);
+		print_world(world);
+		usleep((float) 1 / FRAME_RATE * 1000000); /* sleep */
+		printf("frame: %d\n", counter++);
+	}
+
+	return 0;
+}