Method complex

src/ap.h:116–116

{
public:
    complex():x(0.0),y(0.0){};
    complex(const double &_x):x(_x),y(0.0){};
    complex(const double &_x, const double &_y):x(_x),y(_y){};
    complex(const complex &z):x(z.x),y(z.y){};