snake

snake.c (4420B)

---

 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
 #include <unistd.h>
 #include <X11/Xlib.h>
 #include "X11/keysym.h"
 
 
 #define X 20  /* vertical */
 #define Y 50 /* horizontal */
 
 #define VOID ' '
 #define CELL '#'
 #define APPL 'o'
 #define WALL '$'
 
 char a[X][Y];
 int score = 0;
 
 
 typedef struct position {
 	int x;
 	int y;
 } Position;
 
 
 typedef struct snake {
 	Position cells[100];
 	int direction[100];
 	int length;
 } Snake;
 
 
 void
 print_panel()
 {
 	printf("\033[0;0H");
 
 	int i;
 	for (i = 0; i < Y + 2; i++) {
 		printf("%c", WALL);
 	}
 	printf("\n");
 
 	int j;
 	for (i = 0; i < X; i++) {
 		printf("%c", WALL);
 		for (j = 0; j < Y; j++) {
 			printf("%c",a[i][j]);
 		}
 		printf("%c\n", WALL);
 	}
 
 	for (i = 0; i < Y + 2; i++) {
 		printf("%c", WALL);
 	}
 	printf("\n");
 }
 
 void
 fill_array(char panel[][Y])
 {
 	int i, j;
 	for (i = 0; i < X; i++) {
 		for (j = 0; j < Y; j++) {
 			panel[i][j] = VOID;
 		}
 	}
 }
 
 void
 update_snake(Snake snake)
 {
 	int i;
 	for (i = 0; i < snake.length; i++) {
 		a[snake.cells[i].x][snake.cells[i].y] = CELL;
 	}
 
 	int x = snake.cells[snake.length-1].x;
 	int y = snake.cells[snake.length-1].y;
 
 	if (snake.direction[0] == 1)
 		y = snake.cells[snake.length - 1].y - snake.length -1;
 	else if (snake.direction[0] == 2)
 		y = snake.cells[snake.length - 1].y + snake.length +1;
 	else if (snake.direction[0] == 3)
 		x = snake.cells[snake.length - 1].x - snake.length -1;
 	else if (snake.direction[0] == 4)
 		x = snake.cells[snake.length - 1].x + snake.length +1;
 
 	/*if (snake.direction[snake.length-1] == 1)
 		y = snake.cells[snake.length-1].y -1;
 	else if (snake.direction[snake.length-1] == 2)
 		y = snake.cells[snake.length-1].y  +1;
 	else if (snake.direction[snake.length-1] == 3)
 		x = snake.cells[snake.length-1].x - 1;
 	else if (snake.direction[snake.length-1]  == 4)
 		x = snake.cells[snake.length - 1].x +1;*/
 
 	a[x][y] = VOID;
 }
 
 Position
 get_apple()
 {
 	Position apple;
 
 	do {
 		srand(time(0));
 		apple.x = rand() % (X - 0 + 1);
 
 		srand(time(0));
 		apple.y = rand() % (Y - 0 + 1);
 
 	} while (a[apple.x][apple.y] == CELL);
 
 	a[apple.x][apple.y] = APPL;
 
 	return apple;
 }
 
 
 int
 key_is_pressed(KeySym ks)
 {
 	Display *dpy = XOpenDisplay(":0");
 	char keys_return[32];
 	XQueryKeymap(dpy, keys_return);
 	KeyCode kc2 = XKeysymToKeycode(dpy, ks);
 	int isPressed = !!(keys_return[kc2 >> 3] & (1 << (kc2 & 7)));
 	XCloseDisplay(dpy);
 	return isPressed;
 }
 
 Snake
 get_keys(Snake snake)
 {
 	for (int i = 0; i < snake.length; i++)
 		snake.direction[i+1] = snake.direction[i];
 
 
 	if (key_is_pressed(XK_Up) || key_is_pressed(XK_W)) {
 		snake.direction[0] = 4;
 	}
 
 	if (key_is_pressed(XK_Down) || key_is_pressed(XK_S)) {
 		snake.direction[0] = 3;
 	}
 
 	if (key_is_pressed(XK_Left) || key_is_pressed(XK_A)) {
 		snake.direction[0] = 2;
 	}
 
 	if (key_is_pressed(XK_Right) || key_is_pressed(XK_D)) {
 		snake.direction[0] = 1;
 	}
 	return snake;
 }
 
 Snake
 generation(Snake snake)
 {
 	for (int i = 0; i <= snake.length; i++) {
 		snake.cells[i+1].y = snake.cells[i].y;
 		snake.cells[i+1].x = snake.cells[i].x;
 	}
 
 	if (snake.direction[0] == 1) {
 		snake.cells[0].y++;
 	} else if (snake.direction[0] == 2) {
 		snake.cells[0].y--;
 	} else if (snake.direction[0] == 3) {
 		snake.cells[0].x++;
 	} else if (snake.direction[0] == 4) {
 		snake.cells[0].x--;
 	}
 
 	return snake;
 }
 
 int
 main()
 {
 	fill_array(a);
 
 	Snake snake;
 
 	snake.length = 1;
 	snake.cells[0].y = Y / 2;
 	snake.cells[0].x = X / 2;
 
 	snake.direction[0] = 2;
 	Position apple = get_apple();
 	print_panel();
 
 	do {
 		if (snake.cells[0].x == apple.x &&
 	    	    snake.cells[0].y == apple.y) {
 			apple = get_apple();
 			score += 10;
 
 			int x = snake.cells[snake.length-1].x;
 			int y = snake.cells[snake.length-1].y;
 
 			if (snake.direction[snake.length - 1] == 1)
 				y = snake.cells[snake.length - 1].y + 1;
 			else if (snake.direction[snake.length - 1] == 2)
 				y = snake.cells[snake.length - 1].y - 1;
 			else if (snake.direction[snake.length - 1] == 3)
 				x = snake.cells[snake.length - 1].x + 1;
 			else if (snake.direction[snake.length - 1] == 4)
 				x = snake.cells[snake.length - 1].x - 1;
 
 			snake.length++;
 			snake.cells[snake.length-1].x = x;
 			snake.cells[snake.length-1].y = y;
 		}
 
 		update_snake(snake);
 		print_panel();
 		printf("x=%d, y=%d\n", snake.cells[0].x, snake.cells[0].y);
 		printf("score: %d\nlength: %d\n", score, snake.length);
 
 		snake = get_keys(snake);
 		snake = generation(snake);
 
 		usleep(60000);
 
 	} while (1);
 
 	return 0;
 }