[unix-history] / usr / src / old / lib2648 / motion.c

/*	motion.c	4.1	83/03/09	*/
/*
 * Move the pen to x, y.  We assume we are already in ESCP mode.
 */

#include "2648.h"

motion(x, y)
{
	char lox, loy, hix, hiy;
	int delx, dely;

	delx = x-_penx; dely = y-_peny;
	if (-16 <= delx && delx <= 15 && -16 <= dely && dely <= 15) {
		/*
		 * Optimization: if within 15 in both directions, can use
		 * HP short incremental mode, only 3 bytes.
		 */
		outchar('j');
		outchar(32 + (delx & 31));
		outchar(32 + (dely & 31));
	} else {
		/*
		 * Otherwise must use binary absolute mode, 5 bytes.
		 * We never use ascii mode or binary incremental, since
		 * those both take many more bytes.
		 */
		outchar('i');
		outchar(32+ ((x>>5) & 31));
		outchar(32+ (x&31));
		outchar(32+ ((y>>5) & 31));
		outchar(32+ (y&31));
	}
	_penx = x;
	_peny = y;
}
Commit	Line	Data
93247bc3 RC	1	/* motion.c 4.1 83/03/09 */
	2	/*
	3	* Move the pen to x, y. We assume we are already in ESCP mode.
	4	*/
	5
	6	#include "2648.h"
	7
	8	motion(x, y)
	9	{
	10	char lox, loy, hix, hiy;
	11	int delx, dely;
	12
	13	delx = x-_penx; dely = y-_peny;
	14	if (-16 <= delx && delx <= 15 && -16 <= dely && dely <= 15) {
	15	/*
	16	* Optimization: if within 15 in both directions, can use
	17	* HP short incremental mode, only 3 bytes.
	18	*/
	19	outchar('j');
	20	outchar(32 + (delx & 31));
	21	outchar(32 + (dely & 31));
	22	} else {
	23	/*
	24	* Otherwise must use binary absolute mode, 5 bytes.
	25	* We never use ascii mode or binary incremental, since
	26	* those both take many more bytes.
	27	*/
	28	outchar('i');
	29	outchar(32+ ((x>>5) & 31));
	30	outchar(32+ (x&31));
	31	outchar(32+ ((y>>5) & 31));
	32	outchar(32+ (y&31));
	33	}
	34	_penx = x;
	35	_peny = y;
	36	}