4.3BSD - /usr/src/usr.lib/libplot/aed/space.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: static char sccsid[] = "@(#)space.c	5.2 (Berkeley) 4/30/85";
   9: #endif not lint
  10: 
  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: }

Defined functions

Defined variables