void offset2(const Slic3r::Polygons &polygons, ClipperLib::Paths* retval, const float delta1, const float delta2, const ClipperLib::JoinType joinType, const double miterLimit) { if (delta1 * delta2 >= 0) { // Both deltas are the same signum offset(polygons, retval, delta1 + delta2, joinType, miterLimit); return; } #ifdef CLIPPER_UTILS_DEBUG BoundingBox bbox = get_extents(polygons); coordf_t stroke_width = scale_(0.005); static int iRun = 0; ++ iRun; bool flipY = false; SVG svg(debug_out_path("offset2-%d.svg", iRun), bbox, scale_(1.), flipY); for (Slic3r::Polygons::const_iterator it = polygons.begin(); it != polygons.end(); ++ it) svg.draw(it->lines(), "gray", stroke_width); #endif /* CLIPPER_UTILS_DEBUG */ // read input ClipperLib::Paths input; Slic3rMultiPoints_to_ClipperPaths(polygons, &input); // scale input scaleClipperPolygons(input); // prepare ClipperOffset object ClipperLib::ClipperOffset co; if (joinType == jtRound) { co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE); } else { co.MiterLimit = miterLimit; } // perform first offset ClipperLib::Paths output1; co.AddPaths(input, joinType, ClipperLib::etClosedPolygon); co.Execute(output1, delta1 * float(CLIPPER_OFFSET_SCALE)); #ifdef CLIPPER_UTILS_DEBUG svg.draw(output1, 1. / double(CLIPPER_OFFSET_SCALE), "red", stroke_width); #endif /* CLIPPER_UTILS_DEBUG */ // perform second offset co.Clear(); co.AddPaths(output1, joinType, ClipperLib::etClosedPolygon); co.Execute(*retval, delta2 * float(CLIPPER_OFFSET_SCALE)); #ifdef CLIPPER_UTILS_DEBUG svg.draw(*retval, 1. / double(CLIPPER_OFFSET_SCALE), "green", stroke_width); #endif /* CLIPPER_UTILS_DEBUG */ // unscale output unscaleClipperPolygons(*retval); }
void safety_offset(ClipperLib::Paths* paths) { PROFILE_FUNC(); // scale input scaleClipperPolygons(*paths); // perform offset (delta = scale 1e-05) ClipperLib::ClipperOffset co; #ifdef CLIPPER_UTILS_DEBUG if (clipper_export_enabled) { static int iRun = 0; export_clipper_input_polygons_bin(debug_out_path("safety_offset-polygons-%d", ++iRun).c_str(), *paths, ClipperLib::Paths()); } #endif /* CLIPPER_UTILS_DEBUG */ ClipperLib::Paths out; for (size_t i = 0; i < paths->size(); ++ i) { ClipperLib::Path &path = (*paths)[i]; co.Clear(); co.MiterLimit = 2; bool ccw = ClipperLib::Orientation(path); if (! ccw) std::reverse(path.begin(), path.end()); { PROFILE_BLOCK(safety_offset_AddPaths); co.AddPath((*paths)[i], ClipperLib::jtMiter, ClipperLib::etClosedPolygon); } { PROFILE_BLOCK(safety_offset_Execute); // offset outside by 10um ClipperLib::Paths out_this; co.Execute(out_this, ccw ? 10.f * float(CLIPPER_OFFSET_SCALE) : -10.f * float(CLIPPER_OFFSET_SCALE)); if (! ccw) { // Reverse the resulting contours once again. for (ClipperLib::Paths::iterator it = out_this.begin(); it != out_this.end(); ++ it) std::reverse(it->begin(), it->end()); } if (out.empty()) out = std::move(out_this); else std::move(std::begin(out_this), std::end(out_this), std::back_inserter(out)); } } *paths = std::move(out); // unscale output unscaleClipperPolygons(*paths); }
void _clipper_do(const ClipperLib::ClipType clipType, const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, T* retval, const ClipperLib::PolyFillType fillType, const bool safety_offset_) { PROFILE_BLOCK(_clipper_do_polygons); // read input ClipperLib::Paths input_subject, input_clip; Slic3rMultiPoints_to_ClipperPaths(subject, &input_subject); Slic3rMultiPoints_to_ClipperPaths(clip, &input_clip); // perform safety offset if (safety_offset_) { if (clipType == ClipperLib::ctUnion) { safety_offset(&input_subject); } else { safety_offset(&input_clip); } } // init Clipper ClipperLib::Clipper clipper; clipper.Clear(); // add polygons { PROFILE_BLOCK(_clipper_do_polygons_AddPaths); clipper.AddPaths(input_subject, ClipperLib::ptSubject, true); clipper.AddPaths(input_clip, ClipperLib::ptClip, true); #ifdef CLIPPER_UTILS_DEBUG if (clipper_export_enabled) { static int iRun = 0; export_clipper_input_polygons_bin(debug_out_path("_clipper_do_polygons_AddPaths-polygons-%d", ++iRun).c_str(), input_subject, input_clip); } #endif /* CLIPPER_UTILS_DEBUG */ } // perform operation { PROFILE_BLOCK(_clipper_do_polygons_Execute); clipper.Execute(clipType, *retval, fillType, fillType); } }
// Export to "out/LayerRegion-name-%d.svg" with an increasing index with every export. void Layer::export_region_fill_surfaces_to_svg_debug(const char *name) const { static size_t idx = 0; this->export_region_fill_surfaces_to_svg(debug_out_path("Layer-fill_surfaces-%s-%d.svg", name, idx ++).c_str()); }