21   constexpr PointF() : x_(0.f), y_(0.f) {}  in PointF()
22   constexpr PointF(float x, float y) : x_(x), y_(y) {}  in PointF()
28   constexpr float y() const { return y_; }  in y()
30   void set_y(float y) { y_ = y; }  in set_y()
34     y_ = y;  in SetPoint()
39     y_ += delta_y;  in Offset()
44     y_ += vector.y();
49     y_ -= vector.y();
55   bool IsOrigin() const { return x_ == 0 && y_ == 0; }  in IsOrigin()
57   Vector2dF OffsetFromOrigin() const { return Vector2dF(x_, y_); }  in OffsetFromOrigin()
66     return std::tie(y_, x_) < std::tie(rhs.y_, rhs.x_);
82   float y_;  variable