4.4BSD/usr/src/lib/libplot/aed/space.c

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/*-
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This module is believed to contain source code proprietary to AT&T.
 * Use and redistribution is subject to the Berkeley Software License
 * Agreement and your Software Agreement with AT&T (Western Electric).
 */

#ifndef lint
static char sccsid[] = "@(#)space.c	8.1 (Berkeley) 6/4/93";
#endif /* not lint */

#include "aed.h"

/*---------------------------------------------------------
 *	Space sets up the world-to-screen transformation so
 *	that the rectangular area described by (x0, y0) and
 *	(x1, y1) will all be on-screen.
 *
 *	Results:	None.
 *
 *	Side Effects:
 *	Our own variables scale, xbot, and ybot are changed.
 *---------------------------------------------------------
 */
space(x0, y0, x1, y1)
int x0, y0, x1, y1;
{
    int xscale, yscale, xsize, ysize;
    xscale = (GRXMAX<<12)/(x1-x0);
    yscale = (GRYMAX<<12)/(y1-y0);
    if (xscale > yscale) scale = yscale;
    else scale = xscale;
    scale = (scale*9)/10 - 1;
    if (scale<1) scale = 1;
    xsize = (2048*GRXMAX)/scale + 1;
    xbot = (x1+x0)/2 - xsize;
    ysize = (2048*GRYMAX)/scale + 1;
    ybot = (y1+y0)/2 - ysize;
}