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                 // Handle resizes
  43                 getmaxyx(stdscr, max_y_new, max_x_new);
  44                 --max_x_new;
  45                 --max_y_new;
  46                 pad_h = 0.2 * max_y;
  47                 if (max_y_new != max_y || max_x_new != max_x) {
  48                         clear();
  49                         max_x = max_x_new;
  50                         max_y = max_y_new;
  51                 }
  52
  53                 // Parse keypresses
  54                 int key = getch();
  55                 if (key == 'q') {
  56                         die(0);
  57                 } else if (key == 'k') {
  58                         boff += 2;
  59                 } else if (key == 'i') {
  60                         boff -= 2;
  61                 } else if (key == 's') {
  62                         aoff += 2;
  63                 } else if (key == 'w') {
  64                         aoff -= 2;
  65                 }
  66
  67                 // Clear screen
  68                 for (int i = 0; i < max_y + 1; i++) {
  69                         mvprintw(i, 0, " ");
  70                         mvprintw(i, 1, " ");
  71                         mvprintw(i, max_x, " ");
  72                         mvprintw(i, max_x - 1, " ");
  73                 }
  74
  75                 // Draw paddles
  76                 for (int i = aoff; i < aoff + pad_h; i++) {
  77                         mvprintw(i, 0, "|");
  78                 }
  79
  80                 for (int i = boff; i < boff + pad_h; i++) {
  81                         mvprintw(i, max_x, "|");
  82                 }
  83
  84                 // Draw net
  85                 for (int i = 0; i < max_y; i++) {
  86                         mvprintw(i, max_x/2, ":");
  87                 }
  88
  89                 mvprintw(0, 2, "%d", a_score);
  90                 mvprintw(0, max_x - 1, "%d", b_score);
  91
  92                 // Move ball if enough time has elapsed
  93                 gettimeofday(&stop, NULL);
  94                 if ((double)(stop.tv_usec - start.tv_usec) / 1000000 +
  95                                 (double)(stop.tv_sec - start.tv_sec) > speed) {
  96                         gettimeofday(&start, NULL);
  97                         index += index_dir;
  98                         mvprintw(y, x, " ");
  99                         x += direction;
 100                         y = slope_y * index / slope_x;
 101                         mvprintw(y, x, "o");
 102                 }
 103
 104                 // Check if touching paddle or edges
 105                 if (x >= max_x - 1) {
 106                         if (y >= boff && y <= boff + pad_h) {
 107                                 direction *= -1;
 108                                 x += direction;
 109                         } else {
 110                                 a_score += 1;
 111                                 x = max_x/2;
 112                                 index = (max_y/2)*(slope_x/slope_y);
 113                                 speed /= 0.8;
 114                                 sleep(1);
 115                         }
 116                 } else if (x <= 1) {
 117                         if (y >= aoff && y <= aoff + pad_h) {
 118                                 direction *= -1;
 119                                 x += direction;
 120                         } else {
 121                                 b_score += 1;
 122                                 x = max_x/2;
 123                                 index = (max_y/2)*(slope_x/slope_y);
 124                                 speed /= 0.8;
 125                                 sleep(1);
 126                         }
 127                 } else if (y == 0 || y == max_y) {
 128                         index_dir *= -1;
 129                 }
 130         }
 131 }