Mogan_note4

如何画曲线 1public: 2 inline curve_rep () {} 3 inline virtual ~curve_rep () {} 4 5 inline virtual int nr_components () { return 1; } 6 // the number of components of the curve is useful for getting 7 // nice parameterizations when concatenating curves 8 9 virtual point evaluate (double t)= 0; 10 // gives a point on the curve for its intrinsic parameterization 11 // curves are parameterized from 0.