C++ FCOORD::set_y方法代码示例

// Returns the direction of the fitted line as a unit vector, using the
// least mean squared perpendicular distance. The line runs through the
// mean_point, i.e. a point p on the line is given by:
// p = mean_point() + lambda * vector_fit() for some real number lambda.
// Note that the result (0<=x<=1, -1<=y<=-1) is directionally ambiguous
// and may be negated without changing its meaning.
FCOORD LLSQ::vector_fit() const {
  double x_var = x_variance();
  double y_var = y_variance();
  double covar = covariance();
  FCOORD result;
  if (x_var >= y_var) {
    if (x_var == 0.0)
      return FCOORD(0.0f, 0.0f);
    result.set_x(x_var / sqrt(x_var * x_var + covar * covar));
    result.set_y(sqrt(1.0 - result.x() * result.x()));
  } else {
    result.set_y(y_var / sqrt(y_var * y_var + covar * covar));
    result.set_x(sqrt(1.0 - result.y() * result.y()));
  }
  if (covar < 0.0)
    result.set_y(-result.y());
  return result;
}

void POLY_BLOCK::rotate(FCOORD rotation) {
  FCOORD pos;                    //current pos;
  ICOORDELT *pt;                 //current point
  ICOORDELT_IT pts = &vertices;  //iterator

  do {
    pt = pts.data ();
    pos.set_x (pt->x ());
    pos.set_y (pt->y ());
    pos.rotate (rotation);
    pt->set_x ((inT16) (floor (pos.x () + 0.5)));
    pt->set_y ((inT16) (floor (pos.y () + 0.5)));
    pts.forward ();
  }
  while (!pts.at_first ());
  compute_bb();
}

// Groups blocks by rotation, then, for each group, makes a WordGrid and calls
// TransferDiacriticsToWords to copy the diacritic blobs to the most
// appropriate words in the group of blocks. Source blobs are not touched.
void Textord::TransferDiacriticsToBlockGroups(BLOBNBOX_LIST* diacritic_blobs,
                                              BLOCK_LIST* blocks) {
  // Angle difference larger than this is too much to consider equal.
  // They should only be in multiples of M_PI/2 anyway.
  const double kMaxAngleDiff = 0.01;  // About 0.6 degrees.
  PointerVector<BlockGroup> groups;
  BLOCK_IT bk_it(blocks);
  for (bk_it.mark_cycle_pt(); !bk_it.cycled_list(); bk_it.forward()) {
    BLOCK* block = bk_it.data();
    if (block->pdblk.poly_block() != nullptr && !block->pdblk.poly_block()->IsText()) {
      continue;
    }
    // Linear search of the groups to find a matching rotation.
    float block_angle = block->re_rotation().angle();
    int best_g = 0;
    float best_angle_diff = MAX_FLOAT32;
    for (int g = 0; g < groups.size(); ++g) {
      double angle_diff = fabs(block_angle - groups[g]->angle);
      if (angle_diff > M_PI) angle_diff = fabs(angle_diff - 2.0 * M_PI);
      if (angle_diff < best_angle_diff) {
        best_angle_diff = angle_diff;
        best_g = g;
      }
    }
    if (best_angle_diff > kMaxAngleDiff) {
      groups.push_back(new BlockGroup(block));
    } else {
      groups[best_g]->blocks.push_back(block);
      groups[best_g]->bounding_box += block->pdblk.bounding_box();
      float x_height = block->x_height();
      if (x_height < groups[best_g]->min_xheight)
        groups[best_g]->min_xheight = x_height;
    }
  }
  // Now process each group of blocks.
  PointerVector<WordWithBox> word_ptrs;
  for (int g = 0; g < groups.size(); ++g) {
    const BlockGroup* group = groups[g];
    if (group->bounding_box.null_box()) continue;
    WordGrid word_grid(group->min_xheight, group->bounding_box.botleft(),
                       group->bounding_box.topright());
    for (int b = 0; b < group->blocks.size(); ++b) {
      ROW_IT row_it(group->blocks[b]->row_list());
      for (row_it.mark_cycle_pt(); !row_it.cycled_list(); row_it.forward()) {
        ROW* row = row_it.data();
        // Put the words of the row into the grid.
        WERD_IT w_it(row->word_list());
        for (w_it.mark_cycle_pt(); !w_it.cycled_list(); w_it.forward()) {
          WERD* word = w_it.data();
          WordWithBox* box_word = new WordWithBox(word);
          word_grid.InsertBBox(true, true, box_word);
          // Save the pointer where it will be auto-deleted.
          word_ptrs.push_back(box_word);
        }
      }
    }
    FCOORD rotation = group->rotation;
    // Make it a forward rotation that will transform blob coords to block.
    rotation.set_y(-rotation.y());
    TransferDiacriticsToWords(diacritic_blobs, rotation, &word_grid);
  }
}