curve2d.h

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/* ------------------------------------------------------------
 This is the file "curve2d.h" of the H2Lib package.
 All rights reserved, Steffen Boerm 2010
 ------------------------------------------------------------ */

#ifndef CURVE2D_H
#define CURVE2D_H

typedef struct _curve2d curve2d;

typedef curve2d *pcurve2d;

typedef const curve2d *pccurve2d;

#ifdef USE_CAIRO
#include <cairo/cairo.h>
#endif

#include "settings.h"

struct _curve2d {
  uint vertices;
  uint edges;

  real (*x)[2];
  uint (*e)[2];

  real (*n)[2];
  preal g;
};

/* ------------------------------------------------------------
 constructors / destructors
 ------------------------------------------------------------ */

HEADER_PREFIX pcurve2d
new_curve2d(uint vertices, uint edges);

HEADER_PREFIX void
prepare_curve2d(pcurve2d gr);

HEADER_PREFIX void
del_curve2d(pcurve2d gr);

/* ------------------------------------------------------------
 curve creation
 ------------------------------------------------------------ */

HEADER_PREFIX pcurve2d
new_circle_curve2d(uint edges, real r);

HEADER_PREFIX pcurve2d
new_square_curve2d(uint edges, real a);

HEADER_PREFIX pcurve2d
new_hilbert_curve2d(uint n, real l);

HEADER_PREFIX pcurve2d
new_star_curve2d(uint edges, real r);

/* ------------------------------------------------------------
 output functions
 ------------------------------------------------------------ */

HEADER_PREFIX void
print_curve2d(pccurve2d gr);

#ifdef USE_CAIRO

HEADER_PREFIX void
draw_curve2d(pccurve2d gr, cairo_t *cr, real scale);
#endif

#endif