override public bool select(Vec pos)
{
Vec delta = pos.minus(mPos0);
Vec len = mPos1.minus(mPos0);
double proj1 = delta.dot(len) / len.lenghtSquare();
double proj2 = delta.perp().dot(len) / len.lenghtSquare();
return(proj1 > 0 && proj1 < 1 && proj2 > -0.05 && proj2 < 0.05);
}