tri2d.h

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/* ------------------------------------------------------------
 * This is the file "tri2d.h" of the H2Lib package.
 * All rights reserved, Dirk Boysen 2015
 * ------------------------------------------------------------ */

#ifndef TRI2D_H
#define TRI2D_H

typedef struct _tri2d tri2d;

typedef tri2d *ptri2d;

typedef const tri2d *pctri2d;

typedef struct _tri2dref tri2dref;

typedef tri2dref *ptri2dref;

typedef const tri2dref *pctri2dref;

typedef struct _tri2dbuilder tri2dbuilder;

typedef tri2dbuilder *ptri2dbuilder;

#include "settings.h"

/* ------------------------------------------------------------
   Triangular mesh,
   described by vertices, edges and triangles
   ------------------------------------------------------------ */

struct _tri2d {
  uint vertices;
  
  uint edges;
  
  uint triangles;

  real (*x)[2];
  
  uint (*e)[2];     
  
  uint (*t)[3];     
  
  uint *xb;     

  uint *eb;   
};

/* ------------------------------------------------------------
   Constructors and destructors
   ------------------------------------------------------------ */

HEADER_PREFIX ptri2d
new_tri2d(uint vertices, uint edges, uint triangles);

HEADER_PREFIX void
del_tri2d(ptri2d t2);

HEADER_PREFIX ptri2d
new_unitsquare_tri2d();

HEADER_PREFIX ptri2d
new_unitcircle_tri2d();

HEADER_PREFIX ptri2d
new_lshape_tri2d();

HEADER_PREFIX ptri2d
new_ushape_tri2d();

/* ------------------------------------------------------------
   File I/O
  -------------------------------------------------------------*/

HEADER_PREFIX void
write_tri2d(pctri2d t2, const char *name);

HEADER_PREFIX ptri2d
read_tri2d(const char *name);

/* ------------------------------------------------------------
   Get geometrical information
   ------------------------------------------------------------ */
   

HEADER_PREFIX void
getvertices_tri2d(pctri2d t2, uint tn, uint v[]);

/* ------------------------------------------------------------
   Check structure for inconsistencies
   ------------------------------------------------------------ */

HEADER_PREFIX void
fixnormals_tri2d(ptri2d t2);


HEADER_PREFIX void
check_tri2d(pctri2d t2);


/* ------------------------------------------------------------
   Regular refinement
   ------------------------------------------------------------ */

struct _tri2dref {
  uint *xf;
  uint *xt;     

  uint *ef;     
  uint *et; 

  uint *tf;     
};

HEADER_PREFIX ptri2d
refine_tri2d(pctri2d t2, ptri2dref *t2r);

HEADER_PREFIX void
del_tri2dref(ptri2dref t2r);

/* ------------------------------------------------------------
   Display grid
   ------------------------------------------------------------ */

HEADER_PREFIX void
draw_cairo_tri2d(pctri2d t2, const char *filename,
     bool mark_refedges, int mark_triangle);


/* -----------------------------------------------------------
  ------------------------------------------------------------ */
HEADER_PREFIX void
smooth_unitcircle_tri2d(ptri2d t2);

/* ------------------------------------------------------------
 * Tool for constructing meshes
 * ------------------------------------------------------------ */

HEADER_PREFIX ptri2dbuilder
new_tri2dbuilder(uint vertices);

HEADER_PREFIX void
del_tri2dbuilder(ptri2dbuilder tb);

HEADER_PREFIX real
(*getx_tri2dbuilder(ptri2dbuilder tb))[2];

HEADER_PREFIX void
addtriangle_tri2dbuilder(ptri2dbuilder tb,
       uint v0, uint v1, uint v2);

HEADER_PREFIX ptri2d
buildmesh_tri2dbuilder(ptri2dbuilder tb);

#endif