doublen.h

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 * contributors
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#ifndef __DOUBLEN_H__
#define __DOUBLEN_H__
 
/* C */
#include <stdbool.h>
 
/*****************************************************************************/
 
typedef struct
{
  double a;
  double b;
} double2;
 
typedef struct
{
  double a;
  double b;
  double c;
} double3;
 
typedef struct
{
  double a;
  double b;
  double c;
  double d;
} double4;
 
/*****************************************************************************/
 
extern char *double2_out(const double2 *d, int maxdd);
extern void double2_set(double a, double b, double2 *result);
extern double2 *double2_add(const double2 *d1, const double2 *d2);
extern bool double2_eq(const double2 *d1, const double2 *d2);
 
extern char *double3_out(const double3 *d, int maxdd);
extern void double3_set(double a, double b, double c, double3 *result);
extern double3 *double3_add(const double3 *d1, const double3 *d2);
extern bool double3_eq(const double3 *d1, const double3 *d2);
 
extern char *double4_out(const double4 *d, int maxdd);
extern void double4_set(double a, double b, double c, double d, double4 *result);
extern double4 *double4_add(const double4 *d1, const double4 *d2);
extern bool double4_eq(const double4 *d1, const double4 *d2);
 
extern bool double2_collinear(const double2 *x1, const double2 *x2,
  const double2 *x3, double ratio);
extern bool double3_collinear(const double3 *x1, const double3 *x2,
  const double3 *x3, double ratio);
extern bool double4_collinear(const double4 *x1, const double4 *x2,
  const double4 *x3, double ratio);
 
extern double2 *double2segm_interpolate(const double2 *start,
  const double2 *end, long double ratio);
extern double3 *double3segm_interpolate(const double3 *start,
  const double3 *end, long double ratio);
extern double4 *double4segm_interpolate(const double4 *start,
  const double4 *end, long double ratio);
 
/*****************************************************************************/
 
#endif /* __DOUBLEN_H__ */