/* Draw circular arc in one degree increments. Center is (xc,yc)
with radius r, beginning at starting angle, startang
through angle ang. If ang < 0 arc is draw clockwise. */
void drawarc(xc, yc, r, startang, ang)
float xc, yc, r, startang, ang;
{
#define
#define
float
int
sindt 0.017452406
cosdt 0.999847695
a, x, y, sr;
k;
a= (float) startang*radian;
x= (float) r*cos(a);
y= (float) r*sin(a);
moveto(xc+x, yc+y, 3);
if (ang >= (float) 0.0)
sr= (float) sindt;
else
sr= (float) -sindt;
for (k= 1; k <= (int) floor(fabs(ang)); k++)
{ x= x*cosdt-y*sr;
y= x*sr+y*cosdt;
lineto(xc+x,yc+y);
}
return;
}