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Path: utzoo!utgpu!water!watmath!clyde!rutgers!mit-eddie!uw-beaver!tektronix!tekgen!tekred!games-request
From: games-request@tekred.UUCP
Newsgroups: mod.sources.games
Subject: v01i002:  rot - waterfall terminal display
Message-ID: <1095@tekred.TEK.COM>
Date: Fri, 17-Apr-87 16:25:24 EST
Article-I.D.: tekred.1095
Posted: Fri Apr 17 16:25:24 1987
Date-Received: Sat, 18-Apr-87 19:01:50 EST
Sender: billr@tekred.TEK.COM
Lines: 456
Approved: billr@tekred.TEK.COM

Submitted by: seismo!ut-sally!shell!neuro1!hyd-ptd!peter
Mod.sources.games: Volume 1, Issue 2
Archive-name: rot

	[This was originally posted to net.bizarre back in July 1985.
	 I have compiled and run this sucessfully on our 4.3bsd Vax
	 and don't see any particular machine/os dependencies, other
	 than requiring term{lib|cap}. -br ]

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#		"End of shell archive."
# Contents:  README Makefile rot.c
# Wrapped by billr@tekred on Fri Apr 17 14:20:46 1987
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f README -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"README\"
else
echo shar: Extracting \"README\" \(455 characters\)
sed "s/^X//" >README <<'END_OF_README'
XThis program cascades letters from the top of the terminal screen
Xto the bottom in a waterfall effect.  There was a note in the
Xoriginal posting about this program not working on terminals that
Xrequire padding (PC is read but not used).  Also, this will be
Xpretty slow at lower baudrates.
X
X--
XOriginal source from:
X
X    Peter da Silva (ihnp4!shell!neuro1!{hyd-ptd,datafact,baylor}!peter)
X
XMakefile and README from:
X
X    Bill Randle (billr@tekred.TEK.COM)
END_OF_README
if test 455 -ne `wc -c <README`; then
    echo shar: \"README\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f Makefile -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"Makefile\"
else
echo shar: Extracting \"Makefile\" \(99 characters\)
sed "s/^X//" >Makefile <<'END_OF_Makefile'
X# Simple makefile for rot program
X
Xrot:	rot.c
X	cc -O -o rot rot.c -ltermlib
X
Xtest:	rot
X	rot <rot.c
END_OF_Makefile
if test 99 -ne `wc -c <Makefile`; then
    echo shar: \"Makefile\" unpacked with wrong size!
fi
# end of overwriting check
fi
if test -f rot.c -a "${1}" != "-c" ; then 
  echo shar: Will not over-write existing file \"rot.c\"
else
echo shar: Extracting \"rot.c\" \(7528 characters\)
sed "s/^X//" >rot.c <<'END_OF_rot.c'
X#include <stdio.h>
X
X/*		-- Miscellaneous defines --				     */
X#define FALSE 0
X#define TRUE 1
X#define MAXCOL 80
X#define MAXLI 24
X
Xextern char *tgetstr();
X
Xint lastx, lasty;
Xstruct _c {
X	struct _c *c_next;
X	int c_line, c_column;
X	char c_mark;
X} *clist;
X
X/*		-- Global variables --					     */
Xchar *tent;                                               /* Pointer to tbuf */
Xchar *PC;                                                    /* Pad character */
Xchar *UP, *BC;                                /* Upline, backsapce character */
Xshort ospeed;                                       /* Terminal output speed */
Xint tglen;
X
Xchar *cm,                                                   /* Cursor motion */
X     *cl,                                                    /* Clear screen */
X     *ti,						    /* Init terminal */
X     *te;						   /* Reset terminal */
Xint  li,                                                  /* lines on screen */
X     co;                                                    /* columns ditto */
Xchar screen[MAXLI+1][MAXCOL];
Xchar newscreen[MAXLI+1][MAXCOL];
X
Xmain(ac, av)
Xint ac;
Xchar **av;
X{
X	srand(getpid());
X	tinit(getenv("TERM"));
X	if(av[1])
X		while(*++av)
X			dropf(*av);
X	else
X		fdropf(stdin);
X	tend();
X}
X
Xat(x, y, c)
Xint x, y;
Xchar c;
X{
X#ifdef DEBUG
X	_at(x, y);
X#else
X	if(y==lasty) {
X		if(x!=lastx) {
X			if(x<lastx && lastx-x<tglen)
X				while(x<lastx) {
X					putchar('\b');
X					lastx--;
X				}
X			else if(x>lastx && x-lastx<tglen)
X				while(x>lastx) {
X					putchar(newscreen[lasty][lastx]);
X					lastx++;
X				}
X			else
X				_at(x, y);
X		}
X	} else
X		_at(x, y);
X#endif
X	c &= ~0200;
X	putchar(c);
X	if(c >= ' ' && c != '\177')
X		lastx++;
X	if(lastx>=co) {
X		lastx -= co;
X		lasty++;
X	}
X}
X
X_at(x, y)
Xint x, y;
X{
X	outs(tgoto(cm, x, y));
X	lastx = x;
X	lasty = y;
X}
X
Xtinit(name)
Xchar *name;
X{
X	static char junkbuf[1024], *junkptr;
X	char tbuf[1024];
X	int  intr();
X
X	junkptr = junkbuf;
X
X	tgetent(tbuf, name);
X
X	PC = tgetstr("pc", &junkptr);
X	UP = tgetstr("up", &junkptr);
X	BC = tgetstr("bc", &junkptr);
X	cm = tgetstr("cm", &junkptr);
X	cl = tgetstr("cl", &junkptr);
X	ti = tgetstr("ti", &junkptr);
X	te = tgetstr("te", &junkptr);
X	li = min(tgetnum("li"), MAXLI);
X	co = min(tgetnum("co"), MAXCOL);
X	tglen = strlen(tgoto(co-1, li-1));
X}
X
Xtend()
X{
X	outs(te);
X	_at(0, li-1);
X	putchar('\n');
X	fflush(stdout);
X}
X
Xreadscreen(fp)
XFILE *fp;
X{
X	int line, column, p;
X	char tmp[256];
X
X	for(line=0; line<li; line++)
X		for(column=0; column<co; column++)
X			newscreen[line][column] = screen[line][column] = ' ';
X	for(column=0; column<co; column++)
X		newscreen[li][column] = screen[li][column] = '*';
X	line=0;
X	while(line<li) {
X		if(!fgets(tmp, 256, fp))
X			return;
X
X		for(column=0, p=0; tmp[p]; p++) {
X			tmp[p] &= ~0200;
X			if(tmp[p] < ' ' || tmp[p] == 127)
X				switch(tmp[p]) {
X					case '\t':
X						while(++column % 8)
X							continue;
X						break;
X					case '\n':
X						column = 0;
X						line++;
X						break;
X					default:
X						newscreen[line][column] = '^';
X						column++;
X						if(column>=co) {
X							column -= co;
X							line++;
X						}
X						newscreen[line][column] =
X							(tmp[p]+'@') & 127;
X						column++;
X						break;
X				}
X			else {
X				newscreen[line][column] = tmp[p];
X				column++;
X			}
X			if(column >= co) {
X				column -= co;
X				line++;
X			}
X			if(line >= li)
X				break;
X		}
X	}
X	for(column=0; column<co; column++)
X		newscreen[line][column] = screen[li][column] = '*';
X}
X
Xdrawscreen()
X{
X	lastx = lasty = 0;
X	outs(cl);
X	update();
X}
X
Xupdate() /* copy new screen back to old screen */
X{
X	int l, c;
X
X	for(l=0; l<li; l++)
X		for(c=0; c<co; c++)
X			if(screen[l][c] != newscreen[l][c]) {
X				if((screen[l][c] & ~0200) !=
X				   (newscreen[l][c] & ~0200))
X					at(c, l, newscreen[l][c]);
X				screen[l][c] = newscreen[l][c];
X			}
X}
X
Xdrop(line, column)
Xint line, column;
X{
X	struct _c *hold;
X
X	if(line<0 || line>=li || column<0 || column>=co ||
X	   (line>=li-2 && column >= co-1) || /* scroll potential */
X	   screen[line][column]==' ' || /* empty */
X	   screen[line][column] & 0200) /* already in list */
X		return;
X	if(screen[line+1][column]!=' ' &&
X	   (column==co-1 ||screen[line+1][column+1]!=' ') &&
X	   (column==0 ||screen[line+1][column-1]!=' '))
X		return;
X
X	hold = (struct _c *) malloc(sizeof(struct _c));
X	hold -> c_next = clist;
X	hold -> c_column = column;
X	hold -> c_line = line;
X	hold -> c_mark = 0;
X	screen[line][column] |= 0200;
X	clist = hold;
X}
X
Xdrops()
X{
X	int l, c;
X	struct _c *hold;
X	for(hold = clist; hold; hold=hold->c_next) {
X		int line = hold->c_line, column=hold->c_column;
X		if(line>= li-2 && column>=co-1) {
X			newscreen[line][column] &= ~0200;
X			screen[line][column] &= ~0200;
X			hold->c_mark = 1;
X			continue;
X		}
X		drop(line+1, column);
X		drop(line, column+1);
X		drop(line-1, column);
X		drop(line, column-1);
X		if(newscreen[line+1][column]==' ') {
X			newscreen[line+1][column] = screen[line][column];
X			newscreen[line][column] = ' ';
X			line++;
X		} else if(rand()&01000) {
X			if(column>0 && newscreen[line][column-1] == ' ' &&
X			    newscreen[line+1][column-1]==' ') {
X				newscreen[line][column-1] =
X					screen[line][column];
X				newscreen[line][column] = ' ';
X				column--;
X			}
X			else if(column<co-1 &&
X				newscreen[line][column+1] == ' ' &&
X				newscreen[line+1][column+1]==' ') {
X					newscreen[line][column+1] =
X						screen[line][column];
X					newscreen[line][column] = ' ';
X					column++;
X			}
X			else {
X				screen[line][column] &= ~0200;
X				newscreen[line][column] &= ~0200;
X				hold -> c_mark = 1;
X			}
X		} else {
X			if(column<co-1 && newscreen[line][column+1] == ' ' &&
X			    newscreen[line+1][column+1]==' ') {
X				newscreen[line][column+1] =
X					screen[line][column];
X				newscreen[line][column] = ' ';
X				column++;
X			}
X			else if(column>0 && newscreen[line][column-1] == ' ' &&
X			    newscreen[line+1][column-1]==' ') {
X				newscreen[line][column-1] =
X					screen[line][column];
X				newscreen[line][column] = ' ';
X				column--;
X			}
X			else {
X				newscreen[line][column] &= ~0200;
X				screen[line][column] &= ~0200;
X				hold -> c_mark = 1;
X			}
X		}
X		hold -> c_column = column;
X		hold -> c_line = line;
X		fflush(stdout);
X	}
X
X	while(clist && clist->c_mark) {
X		struct _c *p = clist;
X		clist = clist -> c_next;
X		free(p);
X	}
X	hold = clist;
X	while(hold && hold->c_next)
X		if(hold->c_next->c_mark) {
X			struct _c *p = hold->c_next;
X			hold->c_next = p->c_next;
X			free(p);
X		} else
X			hold=hold->c_next;
X}
X
Xdroplet(line, column)
Xint line, column;
X{
X	int ret;
X	while(column>=0 && screen[line][column]!=' ')
X		column--;
X	column++;
X	while(column<co && screen[line][column]!=' ')
X		drop(line, column++);
X	ret = clist != 0;
X	while(clist) {
X		drops();
X		update();
X	}
X	return ret;
X}
X
Xdropscreen()
X{
X	int column, line;
X	int rubbish = 0, count = 0;
X
X	do {
X		int start, limit, incr;
X		count++;
X		rubbish = 0;
X		if(count&1) { start=li-2; limit=0; incr = -1; }
X		else { start=0; limit=li-2; incr=1; }
X		for(line=start; line!=limit && !rubbish; line+=incr) {
X			if(line&1)
X				for(column=0; column<co && !rubbish; column++)
X					rubbish += droplet(line, column);
X			else
X				for(column=co-1; column>=0 && !rubbish; column--)
X					rubbish += droplet(line, column);
X		}
X	} while(rubbish);
X}
X
Xdropf(file)
Xchar *file;
X{
X	FILE *fp;
X
X	if(!(fp = fopen(file, "r"))) {
X		perror(file);
X		return -1;
X	}
X	fdropf(fp);
X}
X
Xfdropf(fp)
XFILE *fp;
X{
X	int i;
X
X	while(!feof(fp)) {
X		readscreen(fp);
X		drawscreen();
X		for(i=0; i<20; i++)
X			droplet((rand()>>4) % li, (rand()>>4) % co);
X		dropscreen();
X	}
X}
X
Xouts(s)
Xchar *s;
X{
X	fputs(s, stdout);
X}
X
Xmin(a, b)
Xint a, b;
X{
X	if(a<b) return a;
X	return b;
X}
END_OF_rot.c
if test 7528 -ne `wc -c <rot.c`; then
    echo shar: \"rot.c\" unpacked with wrong size!
fi
# end of overwriting check
fi
echo shar: End of shell archive.
exit 0