interp.h

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/*
 * Copyright (c) 2019-2020 Kevin Townsend (KTOWN)
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ZSL_INTERP_H_
#define ZEPHYR_INCLUDE_ZSL_INTERP_H_
 
#include <stdint.h>
#include <zsl/zsl.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct zsl_interp_xy {
    zsl_real_t x;
    zsl_real_t y;
};
 
struct zsl_interp_xyc {
    zsl_real_t x;
    zsl_real_t y;
    zsl_real_t y2; 
};
 /* End of INTERP_STRUCTS group */
 
int zsl_interp_lerp(zsl_real_t v0, zsl_real_t v1, zsl_real_t t, zsl_real_t *v);
 
int zsl_interp_find_x(struct zsl_interp_xy xy[], size_t n, zsl_real_t x,
              int *idx);
 
int zsl_interp_nn(struct zsl_interp_xy *xy1, struct zsl_interp_xy *xy3,
          zsl_real_t x2, zsl_real_t *y2);
 
int zsl_interp_nn_arr(struct zsl_interp_xy xy[], size_t n, zsl_real_t x,
              zsl_real_t *y);
 
int zsl_interp_lin_y(struct zsl_interp_xy *xy1, struct zsl_interp_xy *xy3,
             zsl_real_t x2, zsl_real_t *y2);
 
int zsl_interp_lin_y_arr(struct zsl_interp_xy xy[], size_t n, zsl_real_t x,
             zsl_real_t *y);
 
int zsl_interp_lin_x(struct zsl_interp_xy *xy1, struct zsl_interp_xy *xy3,
             zsl_real_t y2, zsl_real_t *x2);
 
int zsl_interp_cubic_calc(struct zsl_interp_xyc xyc[], size_t n,
              zsl_real_t yp1, zsl_real_t ypn);
 
int zsl_interp_cubic_arr(struct zsl_interp_xyc xyc[], size_t n,
             zsl_real_t x, zsl_real_t *y);
 /* End of INTERP_FUNCS group */
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_ZSL_INTERP_H_ */
 /* End of interpolation group */