http://stackoverflow.com/questions/34337684/how-to-draw-a-segment-of-a-circle-in-cocos2d-x

SO_34337684.cpp

void drawSector(cocos2d::DrawNode* node, cocos2d::Vec2 origin, float radius, float angle_degree,
                cocos2d::Color4F fillColor, float borderWidth, cocos2d::Color4F bordercolor,
                unsigned int num_of_points = 100)
{
  if (!node)
  {
    return;
  }

  const cocos2d::Vec2 start = origin + cocos2d::Vec2{radius, 0};
  const auto angle_step = 2 * M_PI * angle_degree / 360.f / num_of_points;
  std::vector<cocos2d::Point> circle;

  circle.emplace_back(origin);
  for (int i = 0; i <= num_of_points; i++)
  {
    auto rads = angle_step * i;
    auto x = origin.x + radius * cosf(rads);
    auto y = origin.y + radius * sinf(rads);
    circle.emplace_back(x, y);
  }

  node->drawPolygon(circle.data(), circle.size(), fillColor, borderWidth, bordercolor);
}