float Lake::height(const Drop &drop,
unsigned int radius,
unsigned int timestep) const {
unsigned int time_elapsed = timestep - drop.time();
float distance = radius - wave_properties_.speed() * time_elapsed;
return distance / std::exp(distance*distance + time_elapsed/10);
}
inline float Lake::radius(const Drop &drop, unsigned int timestep) const {
return wave_properties_.speed() * (timestep - drop.time());
}