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93 class Curve {
95     virtual ~Curve() {}
107 class RandomCurve : public Curve {
154 class CircleCurve : public Curve {
200     return current_.origin + current_.curve->evaluate(current_.now - current_.start);
207     if (current_.curve) {
208         current_.origin += current_.curve->evaluate(current_.end - current_.start);
219     Curve *curve;
223             curve = new RandomCurve(rng_());
231             curve = new CircleCurve(radius_(rng_), axis);
235             curve = nullptr;
239     current_.curve.reset(curve);