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 */ 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