1 .\" $NetBSD: twinkle1.c,v 1.5 2003/08/07 16:44:29 agc Exp $ 2 .\" 3 .\" Copyright (c) 1980, 1993 4 .\" The Regents of the University of California. All rights reserved. 5 .\" 6 .\" Redistribution and use in source and binary forms, with or without 7 .\" modification, are permitted provided that the following conditions 8 .\" are met: 9 .\" 1. Redistributions of source code must retain the above copyright 10 .\" notice, this list of conditions and the following disclaimer. 11 .\" 2. Redistributions in binary form must reproduce the above copyright 12 .\" notice, this list of conditions and the following disclaimer in the 13 .\" documentation and/or other materials provided with the distribution. 14 .\" 3. Neither the name of the University nor the names of its contributors 15 .\" may be used to endorse or promote products derived from this software 16 .\" without specific prior written permission. 17 .\" 18 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 .\" SUCH DAMAGE. 29 .\" 30 .\" @(#)twinkle1.c 8.1 (Berkeley) 6/8/93 31 .\" 32 # include <curses.h> 33 # include <signal.h> 34 35 /* 36 * the idea for this program was a product of the imagination of 37 * Kurt Schoens. Not responsible for minds lost or stolen. 38 */ 39 40 # define NCOLS 80 41 # define NLINES 24 42 # define MAXPATTERNS 4 43 44 typedef struct { 45 int y, x; 46 } LOCS; 47 48 LOCS Layout[NCOLS * NLINES]; /* current board layout */ 49 50 int Pattern, /* current pattern number */ 51 Numstars; /* number of stars in pattern */ 52 53 char *getenv(); 54 55 int die(); 56 57 main() 58 { 59 srand(getpid()); /* initialize random sequence */ 60 61 initscr(); 62 signal(SIGINT, die); 63 noecho(); 64 nonl(); 65 leaveok(stdscr, TRUE); 66 scrollok(stdscr, FALSE); 67 68 for (;;) { 69 makeboard(); /* make the board setup */ 70 puton('*'); /* put on '*'s */ 71 puton(' '); /* cover up with ' 's */ 72 } 73 } 74 75 /* 76 * On program exit, move the cursor to the lower left corner by 77 * direct addressing, since current location is not guaranteed. 78 * We lie and say we used to be at the upper right corner to guarantee 79 * absolute addressing. 80 */ 81 die() 82 { 83 signal(SIGINT, SIG_IGN); 84 mvcur(0, COLS - 1, LINES - 1, 0); 85 endwin(); 86 exit(0); 87 } 88 89 90 /* 91 * Make the current board setup. It picks a random pattern and 92 * calls ison() to determine if the character is on that pattern 93 * or not. 94 */ 95 makeboard() 96 { 97 reg int y, x; 98 reg LOCS *lp; 99 100 Pattern = rand() % MAXPATTERNS; 101 lp = Layout; 102 for (y = 0; y < NLINES; y++) 103 for (x = 0; x < NCOLS; x++) 104 if (ison(y, x)) { 105 lp->y = y; 106 lp->x = x; 107 lp++; 108 } 109 Numstars = lp - Layout; 110 } 111 112 /* 113 * Return TRUE if (y, x) is on the current pattern. 114 */ 115 ison(y, x) 116 reg int y, x; { 117 118 switch (Pattern) { 119 case 0: /* alternating lines */ 120 return !(y & 01); 121 case 1: /* box */ 122 if (x >= LINES && y >= NCOLS) 123 return FALSE; 124 if (y < 3 || y >= NLINES - 3) 125 return TRUE; 126 return (x < 3 || x >= NCOLS - 3); 127 case 2: /* holy pattern! */ 128 return ((x + y) & 01); 129 case 3: /* bar across center */ 130 return (y >= 9 && y <= 15); 131 } 132 /* NOTREACHED */ 133 } 134 135 puton(ch) 136 reg char ch; 137 { 138 reg LOCS *lp; 139 reg int r; 140 reg LOCS *end; 141 LOCS temp; 142 143 end = &Layout[Numstars]; 144 for (lp = Layout; lp < end; lp++) { 145 r = rand() % Numstars; 146 temp = *lp; 147 *lp = Layout[r]; 148 Layout[r] = temp; 149 } 150 151 for (lp = Layout; lp < end; lp++) { 152 mvaddch(lp->y, lp->x, ch); 153 refresh(); 154 } 155 } 156