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#284 extract perimeter from gap fill where possible

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supermerill 2020-11-16 21:19:28 +01:00
parent eb38405fe8
commit c4851d5896
1 changed files with 47 additions and 0 deletions
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47
src/libslic3r/PerimeterGenerator.cpp
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@ -648,6 +648,53 @@ void PerimeterGenerator::process()
//svg.draw(to_polylines(top_fills), "green");
//svg.Close();
//}
// check for extracting extra perimeters from gapfill
if (!gaps.empty()) {
// if needed, add it to the first empty contour list
const size_t contours_size = loop_number + 1;
//first, find loops and try to extract a perimeter from them.
for (size_t i = 0; i < gaps.size(); i++) {
ExPolygon& expoly = gaps[i];
if (!expoly.holes.empty()) {
//this is a a sort of a loop
//try to see if it's possible to add a "perimeter"
Polygons small_peri = offset(expoly.contour, -(float)(perimeter_spacing), ClipperLib::jtMiter, 3);
Polygons small_holes = expoly.holes;
polygons_reverse(small_holes);
ExPolygons small_ex = diff_ex(small_peri, small_holes);
if (small_ex.size() == 1 && !small_ex.front().holes.empty()) {
//OK
Polygons perimeter_line = offset(expoly.contour, -(float)(perimeter_spacing/2), ClipperLib::jtMiter, 3);
if (perimeter_line.size() != 1)
continue;
// update list & variable to let the new perimeter be taken into account
loop_number = contours_size;
if (contours_size >= contours.size()) {
contours.emplace_back();
holes.emplace_back();
}
//Add the new periemter
contours[contours_size].emplace_back(perimeter_line.front(), contours_size, true, has_steep_overhang);
//create the new gapfills
ExPolygon perimeter_area;
perimeter_area.holes.emplace_back(small_ex.front().contour);
perimeter_area.holes.front().reverse();
perimeter_line = offset(perimeter_line.front(), (float)(perimeter_spacing / 2), ClipperLib::jtMiter, 3);
if (perimeter_line.size() != 1) // should never happen
perimeter_line = { expoly.contour };
perimeter_area.contour = perimeter_line.front();
ExPolygons to_add = diff_ex(expoly, perimeter_area);
//add the new gapfill
if (to_add.size() == 0)
expoly.clear();
else
expoly = to_add.front();
for (size_t j = 1; j < to_add.size(); j++)
gaps.emplace_back(to_add[j]);
}
}
}
}
// nest loops: holes first
for (int d = 0; d <= loop_number; ++d) {