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arrange polies: don't allow snapped point paths to cross non-containing other rect axes

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This commit is contained in:
Thomas Krijnen
2026-05-14 21:45:59 +02:00
parent 55d7c24dc8
commit 13bb8fbb98
1 changed files with 20 additions and 5 deletions
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src/svgfill/src/arrange_polygons.cpp
+20 -5
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@@ -1635,13 +1635,28 @@ std::map<Point_2, std::vector<Point_2>> snap_points_to_box_axes(
auto& c2 = containing[1];
if (angle_between_dirs_deg(boxes[c1.box_index].direction, boxes[c2.box_index].direction) > 8.) {
if (auto x = intersect_infinite_lines_exact(boxes[c1.box_index], boxes[c2.box_index])) {
snapped_points[i] = *x;
debug.write_segment(graph.points[i], *x, "snap_candidate_1");
continue;
auto seg = CGAL::Segment_2<K>(graph.points[i], *x);
bool intersects_with_other_box_axis = false;
for (size_t j = 0; j < boxes.size(); ++j) {
if (j == c1.box_index || j == c2.box_index) {
continue;
}
auto& box = boxes[j];
auto box_seg = CGAL::Segment_2<K>(box.exact_start, box.exact_end);
if (CGAL::do_intersect(seg, box_seg)) {
intersects_with_other_box_axis = true;
break;
}
}
if (!intersects_with_other_box_axis) {
snapped_points[i] = *x;
debug.write_segment(graph.points[i], *x, "snap_candidate_1");
continue;
}
}
}
snapped_points[i] = c1.projection;
debug.write_segment(graph.points[i], c1.projection, "snap_candidate_2");
snapped_points[i] = (c1.projection - graph.points[i]).squared_length() < (c2.projection - graph.points[i]).squared_length() ? c1.projection : c2.projection;
debug.write_segment(graph.points[i], snapped_points[i], "snap_candidate_2");
continue;
}