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- .\" Copyright (c) 1980 The Regents of the University of California.
- .\" All rights reserved.
- .\"
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- .\" 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
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- .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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- .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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- .\" @(#)twinkle1.c 6.3 (Berkeley) 4/17/91
- .\"
- # 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();
- }
- }
-