1 /*-
2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.proprietary.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)space.c 8.1 (Berkeley) 06/04/93";
10 #endif /* not lint */
11
12 #include "grnplot.h"
13
14 /*---------------------------------------------------------
15 * Space sets up the world-to-screen transformation so
16 * that the rectangular area described by (x0, y0) and
17 * (x1, y1) will all be on-screen.
18 *
19 * Results: None.
20 *
21 * Side Effects:
22 * Our own variables scale, xbot, and ybot are changed.
23 *---------------------------------------------------------
24 */
space(x0,y0,x1,y1)25 space(x0, y0, x1, y1)
26 int x0, y0, x1, y1;
27 {
28 double xscale=0.0, yscale=0.0;
29 if (x1>x0)
30 xscale = GRXMAX/(double)(x1-x0);
31 if (y1>y0)
32 yscale = GRYMAX/(double)(y1-y0);
33 scale = (xscale > yscale && yscale > 0)? yscale : xscale;
34 if (scale == 0.0) scale == 1.0;
35 xbot = x0;
36 ybot = y0;
37 }
38