1 /*-
2 * Copyright (c) 1983, 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 "aed.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 int xscale, yscale, xsize, ysize;
29 xscale = (GRXMAX<<12)/(x1-x0);
30 yscale = (GRYMAX<<12)/(y1-y0);
31 if (xscale > yscale) scale = yscale;
32 else scale = xscale;
33 scale = (scale*9)/10 - 1;
34 if (scale<1) scale = 1;
35 xsize = (2048*GRXMAX)/scale + 1;
36 xbot = (x1+x0)/2 - xsize;
37 ysize = (2048*GRYMAX)/scale + 1;
38 ybot = (y1+y0)/2 - ysize;
39 }
40