pong.c

   1 #include <ncurses.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5 #include <sys/time.h>
   6 #include <time.h>
   7
   8 int
   9 die(int code)
  10 {
  11         endwin();
  12         exit(code);
  13 }
  14
  15 int
  16 main(void) {
  17         int x, y, aoff = 0, boff = 0;
  18         int max_y, max_x;
  19         int max_y_new = 0, max_x_new = 0;
  20         int pad_h = 5;
  21         int a_score = 0, b_score = 0;
  22         int slope_x = 8;
  23         int slope_y = 1;
  24         int index_dir = 1;
  25         int direction = 1;
  26         double speed = 0.015;
  27         struct timeval start, stop;
  28
  29         // Initialize curses
  30         initscr();
  31         noecho();
  32         curs_set(0);
  33         nodelay(stdscr, 1); // Don't wait for getch input
  34         getmaxyx(stdscr, max_y, max_x);
  35         --max_x;
  36         --max_y;
  37         int index = (max_y/2)*(slope_x/slope_y);
  38         x = max_x/2;
  39
  40         gettimeofday(&start, NULL);
  41         while(1) {
  42                 getmaxyx(stdscr, max_y_new, max_x_new);
  43                 --max_x_new;
  44                 --max_y_new;
  45                 pad_h = 0.2 * max_y;
  46                 if (max_y_new != max_y || max_x_new != max_x) {
  47                         clear();
  48                         max_x = max_x_new;
  49                         max_y = max_y_new;
  50                 }
  51
  52                 // Parse keypresses
  53                 int key = getch();
  54                 if (key == 'q') {
  55                         die(0);
  56                 } else if (key == 'k') {
  57                         boff += 2;
  58                 } else if (key == 'i') {
  59                         boff -= 2;
  60                 } else if (key == 's') {
  61                         aoff += 2;
  62                 } else if (key == 'w') {
  63                         aoff -= 2;
  64                 }
  65
  66                 // Draw paddles
  67                 for (int i = 0; i < max_y + 1; i++) {
  68                         mvprintw(i, 0, " ");
  69                         mvprintw(i, 1, " ");
  70                         mvprintw(i, max_x, " ");
  71                         mvprintw(i, max_x - 1, " ");
  72                 }
  73                 for (int i = aoff; i < aoff + pad_h; i++) {
  74                         mvprintw(i, 0, "|");
  75                 }
  76
  77                 for (int i = boff; i < boff + pad_h; i++) {
  78                         mvprintw(i, max_x, "|");
  79                 }
  80
  81                 for (int i = 0; i < max_y; i++) {
  82                         mvprintw(i, max_x/2, ":");
  83                 }
  84
  85                 mvprintw(0, 2, "%d", a_score);
  86                 mvprintw(0, max_x - 1, "%d", b_score);
  87
  88                 // Move ball
  89                 gettimeofday(&stop, NULL);
  90                 if ((double)(stop.tv_usec - start.tv_usec) / 1000000 +
  91                                 (double)(stop.tv_sec - start.tv_sec) > speed) {
  92                         gettimeofday(&start, NULL);
  93                         index += index_dir;
  94                         mvprintw(y, x, " ");
  95                         x += direction;
  96                         y = slope_y * index / slope_x;
  97                         mvprintw(y, x, "o");
  98                 }
  99
 100                 // Check if touching paddle or edges
 101                 if (x >= max_x - 1) {
 102                         if (y >= boff && y <= boff + pad_h) {
 103                                 direction *= -1;
 104                                 x += direction;
 105                         } else {
 106                                 a_score += 1;
 107                                 x = max_x/2;
 108                                 index = (max_y/2)*(slope_x/slope_y);
 109                                 speed /= 0.8;
 110                                 sleep(1);
 111                         }
 112                 } else if (x <= 1) {
 113                         if (y >= aoff && y <= aoff + pad_h) {
 114                                 direction *= -1;
 115                                 x += direction;
 116                         } else {
 117                                 b_score += 1;
 118                                 x = max_x/2;
 119                                 index = (max_y/2)*(slope_x/slope_y);
 120                                 speed /= 0.8;
 121                                 sleep(1);
 122                         }
 123                 } else if (y == 0 || y == max_y) {
 124                         index_dir *= -1;
 125                 }
 126         }
 127 }