36 lines
1 KiB
C++
36 lines
1 KiB
C++
/**
|
|
* Defines an ellispoid, which is a basic interpretaion of the ball when it is
|
|
* bouncing.
|
|
**/
|
|
|
|
#include <cstddef>
|
|
#include <cmath>
|
|
#include "Implicit.hpp"
|
|
#include "common_structures.hpp"
|
|
|
|
const double PI = 3.141592653589793;
|
|
|
|
class Spheroid : public ImplicitSurface {
|
|
public:
|
|
Spheroid(Point& _center, size_t _p, size_t _q);
|
|
void update_center_pos(Point& _center);
|
|
void update_radius();
|
|
void set_stiffness(size_t _stiffness);
|
|
double operator() (double _x, double _y, double _z) {
|
|
return (pow(_x - center.x, 2) / pow(q, 2)
|
|
+ pow(_y - center.y, 2) / pow(q, 2)
|
|
+ pow(_z - center.z, 2) / pow(p, 2) -1);
|
|
}
|
|
private:
|
|
/**
|
|
* p corresponds to the half-height of the ball,
|
|
* q to the radius of the ball,
|
|
* V is the volume. Extremely useful to have a constant volume in the
|
|
* ball
|
|
**/
|
|
size_t stiffness;
|
|
double p, q;
|
|
double V;
|
|
Point& center;
|
|
void _compute_volume();
|
|
};
|