line.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*	line.c	4.1	83/03/09	*/
/*
 * line: draw a line from point 1 to point 2.
 */

#include "2648.h"

line(x1, y1, x2, y2)
int x1, y1, x2, y2;
{
#ifdef TRACE
	if (trace)
		fprintf(trace, "line((%d, %d), (%d, %d)),", x1, y1, x2, y2);
#endif
	if (x1==_penx && y1==_peny) {
		/*
		 * Get around a bug in the HP terminal where one point
		 * lines don't get drawn more than once.
		 */
		move(x1, y1+1);
		sync();
	}
	move(x1, y1);
	draw(x2, y2);
}