ENH: revert the bridge change

Find some problem for the change of bridge, revert.

Signed-off-by: salt.wei <[email protected]>
Change-Id: Ib195a9b4425fa54408bcd3842bbafc41a3c79409

src/libslic3r/BridgeDetector.cpp

@@ -119,27 +119,25 @@ bool BridgeDetector::detect_angle(double bridge_direction_override)
  }
 
  double total_length = 0;
- double arachored_length = 0;
  double max_length = 0;
  {
  Lines clipped_lines = intersection_ln(lines, clip_area);
  for (size_t i = 0; i < clipped_lines.size(); ++i) {
  const Line &line = clipped_lines[i];
- double len = line.length();
- total_length += len;
  if (expolygons_contain(this->_anchor_regions, line.a) && expolygons_contain(this->_anchor_regions, line.b)) {
  // This line could be anchored.
- arachored_length += len;
+ double len = line.length();
+ total_length += len;
  max_length = std::max(max_length, len);
  }
  } 
  }
- if (arachored_length == 0.)
+ if (total_length == 0.)
  continue;
 
  have_coverage = true;
  // Sum length of bridged lines.
- candidates[i_angle].coverage = arachored_length / total_length;
+ candidates[i_angle].coverage = total_length;
  /* The following produces more correct results in some cases and more broken in others.
  TODO: investigate, as it looks more reliable than line clipping. */
  // $directions_coverage{$angle} = sum(map $_->area, @{$self->coverage($angle)}) // 0;