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Diffstat (limited to 'lib/libcurses/PSD.doc/twinkle1.c')
| -rw-r--r-- | lib/libcurses/PSD.doc/twinkle1.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/lib/libcurses/PSD.doc/twinkle1.c b/lib/libcurses/PSD.doc/twinkle1.c new file mode 100644 index 0000000..7d3d00d --- /dev/null +++ b/lib/libcurses/PSD.doc/twinkle1.c @@ -0,0 +1,157 @@ +.\" Copyright (c) 1980, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)twinkle1.c 8.1 (Berkeley) 6/8/93 +.\" +# include <curses.h> +# include <signal.h> + +/* + * the idea for this program was a product of the imagination of + * Kurt Schoens. Not responsible for minds lost or stolen. + */ + +# define NCOLS 80 +# define NLINES 24 +# define MAXPATTERNS 4 + +typedef struct { + int y, x; +} LOCS; + +LOCS Layout[NCOLS * NLINES]; /* current board layout */ + +int Pattern, /* current pattern number */ + Numstars; /* number of stars in pattern */ + +char *getenv(); + +int die(); + +main() +{ + srand(getpid()); /* initialize random sequence */ + + initscr(); + signal(SIGINT, die); + noecho(); + nonl(); + leaveok(stdscr, TRUE); + scrollok(stdscr, FALSE); + + for (;;) { + makeboard(); /* make the board setup */ + puton('*'); /* put on '*'s */ + puton(' '); /* cover up with ' 's */ + } +} + +/* + * On program exit, move the cursor to the lower left corner by + * direct addressing, since current location is not guaranteed. + * We lie and say we used to be at the upper right corner to guarantee + * absolute addressing. + */ +die() +{ + signal(SIGINT, SIG_IGN); + mvcur(0, COLS - 1, LINES - 1, 0); + endwin(); + exit(0); +} + + +/* + * Make the current board setup. It picks a random pattern and + * calls ison() to determine if the character is on that pattern + * or not. + */ +makeboard() +{ + reg int y, x; + reg LOCS *lp; + + Pattern = rand() % MAXPATTERNS; + lp = Layout; + for (y = 0; y < NLINES; y++) + for (x = 0; x < NCOLS; x++) + if (ison(y, x)) { + lp->y = y; + lp->x = x; + lp++; + } + Numstars = lp - Layout; +} + +/* + * Return TRUE if (y, x) is on the current pattern. + */ +ison(y, x) +reg int y, x; { + + switch (Pattern) { + case 0: /* alternating lines */ + return !(y & 01); + case 1: /* box */ + if (x >= LINES && y >= NCOLS) + return FALSE; + if (y < 3 || y >= NLINES - 3) + return TRUE; + return (x < 3 || x >= NCOLS - 3); + case 2: /* holy pattern! */ + return ((x + y) & 01); + case 3: /* bar across center */ + return (y >= 9 && y <= 15); + } + /* NOTREACHED */ +} + +puton(ch) +reg char ch; +{ + reg LOCS *lp; + reg int r; + reg LOCS *end; + LOCS temp; + + end = &Layout[Numstars]; + for (lp = Layout; lp < end; lp++) { + r = rand() % Numstars; + temp = *lp; + *lp = Layout[r]; + Layout[r] = temp; + } + + for (lp = Layout; lp < end; lp++) { + mvaddch(lp->y, lp->x, ch); + refresh(); + } +} |
