/* This is file LINE.C */
/*
** Copyright (C) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
**
** This file is distributed under the terms listed in the document
** "copying.dj", available from DJ Delorie at the address above.
** A copy of "copying.dj" should accompany this file; if not, a copy
** should be available from where this file was obtained. This file
** may not be distributed without a verbatim copy of "copying.dj".
**
** This file is distributed WITHOUT ANY WARRANTY; without even the implied
** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
GrLine(x1, y1, x2, y2, c)
{
int dx, dy, sx, sy;
int count;
int brc, brmax;
sx = sy = 1;
dx = x2 - x1;
dy = y2 - y1;
if (dx < 0)
{
dx *= -1;
sx *= -1;
}
if (dy < 0)
{
dy *= -1;
sy *= -1;
}
if (dx > dy)
{
brmax = dx;
brc = dx / 2;
GrPlot(x1, y1, c);
for (count = dx; count; count--)
{
x1 += sx;
brc += dy;
if (brc > brmax)
{
brc -= dx;
y1 += sy;
}
GrPlot(x1, y1, c);
}
}
else
{
brmax = dy;
brc = dy / 2;
GrPlot(x1, y1, c);
for (count = dy; count; count--)
{
y1 += sy;
brc += dx;
if (brc > brmax)
{
brc -= dy;
x1 += sx;
}
GrPlot(x1, y1, c);
}
}
}