#ifndef _SPIRO_H

#define _SPIRO_H

typedef struct {

/* User passes an array of SpiroCP in this format for Spiro to solve */

    double x;		/* Spiro CodePoint Xloc */

    double y;		/* Spiro CodePoint Yloc */

    char ty;		/* Spiro CodePoint Type */

} spiro_cp;

struct spiro_seg_s {

/* run_spiro() uses array of information given in the structure above and */

/* creates an array in this structure format to use by spiro_to_bpath for */

/* building bezier curves */

    double x;		/* SpiroCP segment_chord startX */

    double y;		/* SpiroCP segment_chord startY */

    char ty;		/* Spiro CodePoint Type */

    double bend_th;	/* bend theta between this vector and next vector */

    double ks[4];

    double seg_ch;	/* segment_chord distance from xy to next SpiroCP */

    double seg_th;	/* segment_theta angle for this SpiroCP */

    double l;

};

typedef struct spiro_seg_s spiro_seg;

spiro_seg *

run_spiro(const spiro_cp *src, int n);

void

free_spiro(spiro_seg *s);

void

spiro_to_bpath(const spiro_seg *s, int n, bezctx *bc);

double get_knot_th(const spiro_seg *s, int i);

#endif