/* Cross-section input/output. */
/* Last edited on 2015-10-01 20:13:07 by stolfilocal */

#ifndef salamic_section_write_H
#define salamic_section_write_H

#define _GNU_SOURCE
#include <stdint.h>
#include <stdio.h>

#include <bool.h>

#include <salamic_mesh.h>

void salamic_section_write_section_header(FILE *wr, salamic_mesh_t *mesh, int32_t pZ, int32_t mf);
  /* Writes to {wr} the header of a file that contains a cross-section
    {mesh} by a slicing plane with quantized {Z}-coordinate {pZ}.
    Assumes that the slicing plane intersects a total of {mf} faces. */
  
void salamic_section_write_path_or_loop(FILE *wr, salamic_mesh_t *mesh, int32_t pZ, int32_t me, int32_t ixEdge[]);
  /* Writes to {wr} an open or closed path that is part of a cross-section defined by {mesh,pZ}.
    Assumes that the vertices of the path are the intersections of
    the slicing plane with the edges {ixEdge[0..me-1]}.  The path is assumed to be 
    closed if and only if {ixEdge[0] == ixEdge[me-1]}. */
    
#define salamic_section_VERSION "2015-09-30"
  /* Current version of cross-section file format. */

#define salamic_section_format_INFO \
  "The file for one cross-section starts with a preamble\n" \
  "\n" \
  "    begin salamic_section (format of " salamic_section_VERSION ")\n" \
  "    eps = {EPS}\n" \
  "    planeZ = {PLANEZ}\n" \
  "    planeQ = {PLANEQ}\n" \
  "    nSegs = {NSEGS}\n" \
  "\n" \
  "  where {EPS} is the fundamental unit of length used in the" \
  " quantization of the mesh (in mm), {PLANEZ} is the {Z}-coordinate" \
  " of the slicing plane (in mm), {PLANEQ} is the integer {PLANEZ/EPS}, and" \
  " {NSEGS} is the total number of line segments in the cross-section.  The" \
  " whole file ends with a one-line footer, \"end salamic_section\".\n" \
  "\n" \
  "  Between the header and the footer there are zero or more blocks of lines, one" \
  " for each separate polygonal line found by the loop closing algorithm.  Each" \
  " block starts with a line \"path {NV}\", where {NV} is the number of vertices" \
  " on the path, and ends with an \"endpath\" line.  In between are the corodinates" \
  " of the path vertices, one per line, in mm.  The path can be assumed to be" \
  " closed if the last vertex is equal to the first one."
  

void salamic_section_write_section_footer(FILE *wr);
  /* Writes to {wr} the footer of a file that contains a mesh cross-section. */

#endif