Mon 14 Oct 23:09:15 CEST 2024
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user/snake.c
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209
user/snake.c
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/*
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Copyright (C) 2016-2019 The University of Notre Dame
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This software is distributed under the GNU General Public License.
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See the file LICENSE for details.
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*/
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#include "library/string.h"
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#include "library/syscalls.h"
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#include "library/stdio.h"
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#include "library/nwindow.h"
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#define SNAKE_MAX 128
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#define THICK 5
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struct coords { int x; int y; };
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struct nwindow *nw = 0;
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int randint(int min, int max)
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{
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// Could be a lot better but at the moment it works
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uint32_t tm;
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syscall_system_time(&tm);
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int state = tm;
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if(state % 5 == 0) {
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state += 50000;
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} else if(state % 4 == 0) {
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state += 1000;
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} else if(state % 3 == 0) {
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state += 10000;
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} else if(state % 2 == 0) {
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state += 25000;
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} else {
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state += 16000;
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}
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int diff = max - min;
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return state % diff + min;
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}
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void init_snake_coords(struct coords *snake, int *length, int xsteps, int ysteps )
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{
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*length = 3;
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snake[0].x = xsteps/2;
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snake[0].y = ysteps/2;
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int i;
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for(i=1;i<*length++;i++) {
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snake[i].x = snake[i-1].x-1;
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snake[i].y = snake[0].y;
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}
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}
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void scaled_rect( struct nwindow *nw, int x, int y, int scale )
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{
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nw_rect(nw,x*scale,y*scale,scale,scale);
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}
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void update_snake(struct coords *snake, int *length, int x, int y, int grow )
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{
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int i;
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if(!grow) {
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nw_fgcolor(nw,0,0,0);
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scaled_rect(nw,snake[*length-1].x,snake[*length-1].y,THICK);
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}
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*length += grow;
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for(i=*length-1;i>0;i--) {
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snake[i] = snake[i-1];
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}
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snake[0].x = x;
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snake[0].y = y;
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nw_fgcolor(nw,0,255,0);
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scaled_rect(nw,x,y,THICK);
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}
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int check_snake_collision( struct coords *snake, int length )
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{
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int i;
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for(i=1;i<length;i++) {
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if(snake[i].x==snake[0].x && snake[i].y==snake[0].y) return 1;
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}
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return 0;
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}
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void init_apple( struct coords *apple, int xsteps, int ysteps )
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{
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apple->x = randint(0,xsteps);
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apple->y = randint(0,ysteps);
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nw_fgcolor(nw,255, 0, 0);
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scaled_rect(nw,apple->x,apple->y,THICK);
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}
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int move_snake(struct coords *snake, int *length, struct coords *apple, int xsteps, int ysteps, char dir)
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{
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int x, y;
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switch (dir) {
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case 'a':
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x = snake[0].x - 1;
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y = snake[0].y;
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break;
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case 'd':
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x = snake[0].x + 1;
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y = snake[0].y;
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break;
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case 'w':
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x = snake[0].x;
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y = snake[0].y - 1;
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break;
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case 's':
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x = snake[0].x;
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y = snake[0].y + 1;
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break;
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default:
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x = snake[0].x;
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y = snake[0].y;
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break;
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}
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if(x<=-1 || x>=xsteps || y<=-1 || y>=ysteps ) return -1;
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if(x==apple->x && y==apple->y) {
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update_snake(snake, length, x, y, 5);
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init_apple(apple,xsteps,ysteps);
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} else {
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update_snake(snake, length, x, y, 0);
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}
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if(check_snake_collision(snake,*length)) {
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return -1;
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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struct coords snake[SNAKE_MAX];
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struct coords apple;
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int snake_length = 3;
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int speed = 100;
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nw = nw_create_default();
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int width = nw_width(nw);
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int height = nw_height(nw);
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// Board dimensions in snake blocks
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int xsteps = width / THICK;
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int ysteps = height / THICK;
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nw_clear(nw,0, 0, width, height);
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nw_string(nw,THICK * 3, THICK * 4, "Press any key to start");
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nw_string(nw,THICK * 3, THICK * 8, "w: up");
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nw_string(nw,THICK * 3, THICK * 12, "s: down");
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nw_string(nw,THICK * 3, THICK * 16, "a: left");
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nw_string(nw,THICK * 3, THICK * 20, "d: right");
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nw_flush(nw);
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char c = nw_getchar(nw,1);
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while(1) {
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char dir = 'd';
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nw_clear(nw,0,0,width,height);
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init_snake_coords(snake, &snake_length, xsteps, ysteps);
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init_apple(&apple,xsteps, ysteps);
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while(1) {
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syscall_process_sleep(speed);
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c = nw_getchar(nw,0);
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if((c == 'a' && dir == 'd') || (c == 'd' && dir == 'a') || (c == 'w' && dir == 's') || (c == 's' && dir == 'w')) {
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// reject conflicting input
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} else if(c == 'w' || c == 'a' || c == 's' || c == 'd') {
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dir = c;
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} else if(c=='q') {
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break;
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}
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int status = move_snake(snake, &snake_length, &apple, xsteps, ysteps, dir);
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nw_flush(nw);
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if(status<0) break;
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}
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nw_flush(nw);
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nw_fgcolor(nw,255, 255, 255);
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nw_string(nw,THICK * 3, THICK * 4, "You lose!");
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nw_string(nw,THICK * 3, THICK * 8, "Enter q to quit");
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nw_string(nw,THICK * 3, THICK * 12, "Press any key to start");
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nw_flush(nw);
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c = nw_getchar(nw,1);
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if (c == 'q') return 0;
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}
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}
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