2.11BSD/src/usr.lib/libplot/dumb/dumb.h

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/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)dumb.h	5.1.1 (2.11BSD GTE) 1/1/94
 *
 *
 * This accepts plot file formats and produces the appropriate plots
 * for dumb terminals.  It can also be used for printing terminals and
 * lineprinter listings, although there is no way to specify number of
 * lines and columns different from your terminal.  This would be easy
 * to change, and is left as an exercise for the reader.
 */

#include <math.h>

#define scale(x,y) y = LINES-1-(LINES*y/rangeY +minY); x = COLS*x/rangeX + minX

extern int minX, rangeX;	/* min and range of x */
extern int minY, rangeY;	/* min and range of y */

extern int currentx, currenty;
extern int COLS, LINES;

/* A very large screen! (probably should use malloc) */
#define MAXCOLS		132
#define MAXLINES	90

extern char screenmat[MAXCOLS][MAXLINES];