int ON_Intersect(
const ON_Plane& plane,
const ON_Circle& circle,
ON_3dPoint& point0,
ON_3dPoint& point1
)
{
int rval = -1;
ON_Line xline;
double a,b;
bool rc = ON_Intersect(plane, circle.Plane(), xline);
if(rc)
{
rval = ON_Intersect(xline, circle, &a, point0, &b, point1);
}
else
{
double d = plane.plane_equation.ValueAt( circle.Center() );
if(d<ON_ZERO_TOLERANCE)
rval =3;
else
rval = 0;
}
return rval;
}
ON_BOOL32 ON_Ellipse::Create( const ON_Circle& c )
{
return Create( c.Plane(), c.Radius(), c.Radius() );
}