[unix-history] / usr / src / lib / libplot / aed / space.c

#ifndef lint
static char sccsid[] = "@(#)space.c	4.1 (Berkeley) %G%";
#endif

#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;
}
Commit	Line	Data
232d9b7d RC	1	#ifndef lint
	2	static char sccsid[] = "@(#)space.c 4.1 (Berkeley) %G%";
	3	#endif
	4
	5	#include "aed.h"
	6
	7	/*---------------------------------------------------------
	8	* Space sets up the world-to-screen transformation so
	9	* that the rectangular area described by (x0, y0) and
	10	* (x1, y1) will all be on-screen.
	11	*
	12	* Results: None.
	13	*
	14	* Side Effects:
	15	* Our own variables scale, xbot, and ybot are changed.
	16	*---------------------------------------------------------
	17	*/
	18	space(x0, y0, x1, y1)
	19	int x0, y0, x1, y1;
	20	{
	21	int xscale, yscale, xsize, ysize;
	22	xscale = (GRXMAX<<12)/(x1-x0);
	23	yscale = (GRYMAX<<12)/(y1-y0);
	24	if (xscale > yscale) scale = yscale;
	25	else scale = xscale;
	26	scale = (scale*9)/10 - 1;
	27	if (scale<1) scale = 1;
	28	xsize = (2048*GRXMAX)/scale + 1;
	29	xbot = (x1+x0)/2 - xsize;
	30	ysize = (2048*GRYMAX)/scale + 1;
	31	ybot = (y1+y0)/2 - ysize;
	32	}