epsilon.h

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#ifndef __epsilon_h
#define __epsilon_h

#include "graphics/real.h"

namespace graphics {

extern real epsilon;
extern real user_epsilon;
extern real intersection_epsilon;

extern real sqrt_epsilon;
extern real unset_value;
extern real zero_tolerance;
extern real angle_tolerance;
extern real zero_epsilon;


/*|--------------------------------------------------------------------------*/
/*| Set user epsilon : Throughout the running program we could use the same  */
/*| user epsilon defined here. Default user_epsilon is always 1e-8.          */
/*|--------------------------------------------------------------------------*/
void set_u_epsilon(real a);

void reset_u_epsilon();


void set_zero_epsilon(real a);

void reset_zero_epsilon();
/*|--------------------------------------------------------------------------*/
/*| Approximated version of checking equality : using epsilon                */
/*|--------------------------------------------------------------------------*/
int apx_equal(real x, real y);

int apx_equal(real x, real y, real eps);

}; // namespace graphics
#endif