double e = GetEndAngle();
double s = GetStartAngle();
double d = e - s;

double x = 0.0;
double y = 0.0;
double offset = 0.0;
if(d < 0.0) {
    offset = PI;
}
x = (GetPosition().GetX() + std::cos(((s + e) / 2.0) + offset) * GetRadius());
y = (GetPosition().GetY() + -std::sin(((s + e) / 2.0) + offset) * GetRadius());