Function msPolylineLabelPath

mapprimitive.c:1727–1770

Calculate the labelpath for each line if repeatdistance is enabled, else the labelpath of the longest line segment */

/* Calculate the labelpath for each line if repeatdistance is enabled, else the labelpath of the longest line segment */
labelPathObj** msPolylineLabelPath(mapObj *map, imageObj *img,shapeObj *p, int min_length, fontSetObj *fontset, char *string, labelObj *label, double scalefactor, int *numpaths,
                                   int** regular_lines, int* num_regular_lines)
{
  double max_line_length, total_length;
  double **segment_lengths, *line_lengths;
  int i, segment_index, max_line_index, labelpaths_index, labelpaths_size, regular_lines_index, regular_lines_size;
  labelPathObj** labelpaths;

  labelpaths_index = 0;
  labelpaths_size = p->numlines; // minimal array size
  regular_lines_index = 0;
  regular_lines_size = 1;
  *numpaths = 0;
  segment_index = max_line_index = 0;
  total_length = max_line_length = 0.0;

  labelpaths = (labelPathObj **) msSmallMalloc(sizeof(labelPathObj *) * labelpaths_size);
  (*regular_lines) = (int *) msSmallMalloc(sizeof(int) * regular_lines_size);

  msPolylineComputeLineSegments(p, &segment_lengths, &line_lengths, &max_line_index, &max_line_length, &segment_index, &total_length);
 
  if (label->repeatdistance > 0)
    for(i=0; i<p->numlines; i++) {
      msPolylineLabelPathLineString(map,img, p,min_length, fontset, string, label, scalefactor, i, segment_lengths, line_lengths[i], total_length, 
                                    &labelpaths_index, &labelpaths_size, &labelpaths, regular_lines, &regular_lines_index, &regular_lines_size);
    }
  else
    msPolylineLabelPathLineString(map, img, p,min_length, fontset, string, label, scalefactor, max_line_index, segment_lengths, line_lengths[max_line_index], total_length, 
                                  &labelpaths_index, &labelpaths_size, &labelpaths, regular_lines, &regular_lines_index, &regular_lines_size);

  /* freeing memory: allocated by msPolylineComputeLineSegments */
  if ( segment_lengths ) {
    for ( i = 0; i < p->numlines; i++ )
      free(segment_lengths[i]);
    free(segment_lengths);
  }

  free(line_lengths);

  /* set the number of paths in the array */
  *numpaths = labelpaths_index;
  *num_regular_lines = regular_lines_index;
  return labelpaths;
}

/*
 * Calculate a series of label points for each character in the label for a