2013-07-16 19:04:14 +00:00
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#include "ClipperUtils.hpp"
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2013-11-23 22:21:59 +00:00
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#include "Geometry.hpp"
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2019-09-26 15:30:03 +00:00
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#include "ShortestPath.hpp"
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2013-07-16 19:04:14 +00:00
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2016-09-13 11:30:00 +00:00
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// #define CLIPPER_UTILS_DEBUG
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#ifdef CLIPPER_UTILS_DEBUG
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#include "SVG.hpp"
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#endif /* CLIPPER_UTILS_DEBUG */
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2016-11-16 21:12:58 +00:00
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#include <Shiny/Shiny.h>
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2017-04-04 09:17:25 +00:00
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#define CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR (0.005f)
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2013-07-16 19:04:14 +00:00
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namespace Slic3r {
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2016-11-28 16:33:17 +00:00
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#ifdef CLIPPER_UTILS_DEBUG
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bool clipper_export_enabled = false;
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// For debugging the Clipper library, for providing bug reports to the Clipper author.
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bool export_clipper_input_polygons_bin(const char *path, const ClipperLib::Paths &input_subject, const ClipperLib::Paths &input_clip)
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{
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2016-12-13 18:22:23 +00:00
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FILE *pfile = fopen(path, "wb");
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if (pfile == NULL)
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return false;
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uint32_t sz = uint32_t(input_subject.size());
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fwrite(&sz, 1, sizeof(sz), pfile);
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for (size_t i = 0; i < input_subject.size(); ++i) {
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const ClipperLib::Path &path = input_subject[i];
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sz = uint32_t(path.size());
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::fwrite(&sz, 1, sizeof(sz), pfile);
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::fwrite(path.data(), sizeof(ClipperLib::IntPoint), sz, pfile);
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}
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sz = uint32_t(input_clip.size());
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::fwrite(&sz, 1, sizeof(sz), pfile);
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for (size_t i = 0; i < input_clip.size(); ++i) {
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const ClipperLib::Path &path = input_clip[i];
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sz = uint32_t(path.size());
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::fwrite(&sz, 1, sizeof(sz), pfile);
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::fwrite(path.data(), sizeof(ClipperLib::IntPoint), sz, pfile);
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}
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::fclose(pfile);
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return true;
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2016-11-28 16:33:17 +00:00
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err:
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2016-12-13 18:22:23 +00:00
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::fclose(pfile);
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return false;
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2016-11-28 16:33:17 +00:00
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}
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#endif /* CLIPPER_UTILS_DEBUG */
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void scaleClipperPolygon(ClipperLib::Path &polygon)
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2016-10-20 11:04:23 +00:00
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{
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2016-11-16 21:12:58 +00:00
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PROFILE_FUNC();
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2016-10-20 11:04:23 +00:00
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for (ClipperLib::Path::iterator pit = polygon.begin(); pit != polygon.end(); ++pit) {
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2016-11-28 16:33:17 +00:00
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pit->X <<= CLIPPER_OFFSET_POWER_OF_2;
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pit->Y <<= CLIPPER_OFFSET_POWER_OF_2;
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2016-10-20 11:04:23 +00:00
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}
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}
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2016-11-28 16:33:17 +00:00
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void scaleClipperPolygons(ClipperLib::Paths &polygons)
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2013-07-16 19:04:14 +00:00
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{
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2016-11-16 21:12:58 +00:00
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PROFILE_FUNC();
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2016-11-28 16:33:17 +00:00
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for (ClipperLib::Paths::iterator it = polygons.begin(); it != polygons.end(); ++it)
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2013-11-20 14:59:19 +00:00
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for (ClipperLib::Path::iterator pit = (*it).begin(); pit != (*it).end(); ++pit) {
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2016-11-28 16:33:17 +00:00
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pit->X <<= CLIPPER_OFFSET_POWER_OF_2;
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pit->Y <<= CLIPPER_OFFSET_POWER_OF_2;
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2013-07-16 19:04:14 +00:00
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}
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2016-11-28 16:33:17 +00:00
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}
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void unscaleClipperPolygon(ClipperLib::Path &polygon)
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{
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PROFILE_FUNC();
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for (ClipperLib::Path::iterator pit = polygon.begin(); pit != polygon.end(); ++pit) {
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pit->X += CLIPPER_OFFSET_SCALE_ROUNDING_DELTA;
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pit->Y += CLIPPER_OFFSET_SCALE_ROUNDING_DELTA;
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pit->X >>= CLIPPER_OFFSET_POWER_OF_2;
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pit->Y >>= CLIPPER_OFFSET_POWER_OF_2;
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2013-07-16 19:04:14 +00:00
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}
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}
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2016-11-28 16:33:17 +00:00
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void unscaleClipperPolygons(ClipperLib::Paths &polygons)
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{
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PROFILE_FUNC();
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for (ClipperLib::Paths::iterator it = polygons.begin(); it != polygons.end(); ++it)
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for (ClipperLib::Path::iterator pit = (*it).begin(); pit != (*it).end(); ++pit) {
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pit->X += CLIPPER_OFFSET_SCALE_ROUNDING_DELTA;
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pit->Y += CLIPPER_OFFSET_SCALE_ROUNDING_DELTA;
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pit->X >>= CLIPPER_OFFSET_POWER_OF_2;
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pit->Y >>= CLIPPER_OFFSET_POWER_OF_2;
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}
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}
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2016-12-13 18:22:23 +00:00
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//-----------------------------------------------------------
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// legacy code from Clipper documentation
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void AddOuterPolyNodeToExPolygons(ClipperLib::PolyNode& polynode, ExPolygons* expolygons)
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{
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size_t cnt = expolygons->size();
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expolygons->resize(cnt + 1);
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2016-12-13 21:13:02 +00:00
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(*expolygons)[cnt].contour = ClipperPath_to_Slic3rPolygon(polynode.Contour);
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2016-12-13 18:22:23 +00:00
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(*expolygons)[cnt].holes.resize(polynode.ChildCount());
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for (int i = 0; i < polynode.ChildCount(); ++i)
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{
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2016-12-13 21:13:02 +00:00
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(*expolygons)[cnt].holes[i] = ClipperPath_to_Slic3rPolygon(polynode.Childs[i]->Contour);
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2016-12-13 18:22:23 +00:00
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//Add outer polygons contained by (nested within) holes ...
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for (int j = 0; j < polynode.Childs[i]->ChildCount(); ++j)
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AddOuterPolyNodeToExPolygons(*polynode.Childs[i]->Childs[j], expolygons);
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}
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}
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ExPolygons
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PolyTreeToExPolygons(ClipperLib::PolyTree& polytree)
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2013-07-16 19:04:14 +00:00
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{
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2016-12-13 18:22:23 +00:00
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ExPolygons retval;
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for (int i = 0; i < polytree.ChildCount(); ++i)
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AddOuterPolyNodeToExPolygons(*polytree.Childs[i], &retval);
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return retval;
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2013-07-16 22:48:29 +00:00
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}
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2016-12-13 18:22:23 +00:00
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//-----------------------------------------------------------
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2013-07-16 22:48:29 +00:00
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2016-12-13 21:13:02 +00:00
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Slic3r::Polygon ClipperPath_to_Slic3rPolygon(const ClipperLib::Path &input)
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2013-07-16 22:48:29 +00:00
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{
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2016-12-13 21:13:02 +00:00
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Polygon retval;
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for (ClipperLib::Path::const_iterator pit = input.begin(); pit != input.end(); ++pit)
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2019-04-03 08:17:57 +00:00
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retval.points.emplace_back(pit->X, pit->Y);
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2016-12-13 21:13:02 +00:00
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return retval;
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}
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Slic3r::Polyline ClipperPath_to_Slic3rPolyline(const ClipperLib::Path &input)
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{
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Polyline retval;
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2016-12-13 18:22:23 +00:00
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for (ClipperLib::Path::const_iterator pit = input.begin(); pit != input.end(); ++pit)
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2019-04-03 08:17:57 +00:00
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retval.points.emplace_back(pit->X, pit->Y);
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2016-12-13 18:22:23 +00:00
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return retval;
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2013-07-16 22:48:29 +00:00
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}
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2016-12-13 20:30:56 +00:00
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Slic3r::Polygons ClipperPaths_to_Slic3rPolygons(const ClipperLib::Paths &input)
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2015-07-23 13:53:02 +00:00
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{
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2016-12-13 20:30:56 +00:00
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Slic3r::Polygons retval;
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retval.reserve(input.size());
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for (ClipperLib::Paths::const_iterator it = input.begin(); it != input.end(); ++it)
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2019-04-03 08:17:57 +00:00
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retval.emplace_back(ClipperPath_to_Slic3rPolygon(*it));
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2016-12-13 20:30:56 +00:00
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return retval;
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}
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Slic3r::Polylines ClipperPaths_to_Slic3rPolylines(const ClipperLib::Paths &input)
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{
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Slic3r::Polylines retval;
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retval.reserve(input.size());
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2016-12-13 18:22:23 +00:00
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for (ClipperLib::Paths::const_iterator it = input.begin(); it != input.end(); ++it)
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2019-04-03 08:17:57 +00:00
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retval.emplace_back(ClipperPath_to_Slic3rPolyline(*it));
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2016-12-13 18:22:23 +00:00
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return retval;
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2015-07-23 13:53:02 +00:00
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}
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2016-12-13 18:22:23 +00:00
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ExPolygons
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ClipperPaths_to_Slic3rExPolygons(const ClipperLib::Paths &input)
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2013-11-20 10:35:58 +00:00
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{
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2016-12-13 18:22:23 +00:00
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// init Clipper
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ClipperLib::Clipper clipper;
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clipper.Clear();
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2013-11-20 10:35:58 +00:00
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2016-12-13 18:22:23 +00:00
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// perform union
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clipper.AddPaths(input, ClipperLib::ptSubject, true);
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ClipperLib::PolyTree polytree;
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clipper.Execute(ClipperLib::ctUnion, polytree, ClipperLib::pftEvenOdd, ClipperLib::pftEvenOdd); // offset results work with both EvenOdd and NonZero
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2013-11-20 10:35:58 +00:00
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2016-12-13 18:22:23 +00:00
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// write to ExPolygons object
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return PolyTreeToExPolygons(polytree);
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2013-11-20 10:35:58 +00:00
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}
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2016-12-13 18:22:23 +00:00
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ClipperLib::Path
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Slic3rMultiPoint_to_ClipperPath(const MultiPoint &input)
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2013-11-20 10:35:58 +00:00
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{
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2016-12-13 18:22:23 +00:00
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ClipperLib::Path retval;
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for (Points::const_iterator pit = input.points.begin(); pit != input.points.end(); ++pit)
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2019-04-03 08:17:57 +00:00
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retval.emplace_back((*pit)(0), (*pit)(1));
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2016-12-13 18:22:23 +00:00
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return retval;
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2013-11-20 10:35:58 +00:00
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}
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2016-12-13 18:22:23 +00:00
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ClipperLib::Path
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Slic3rMultiPoint_to_ClipperPath_reversed(const Slic3r::MultiPoint &input)
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2013-11-23 17:29:25 +00:00
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{
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2016-12-13 18:22:23 +00:00
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ClipperLib::Path output;
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output.reserve(input.points.size());
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for (Slic3r::Points::const_reverse_iterator pit = input.points.rbegin(); pit != input.points.rend(); ++pit)
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2019-04-03 08:17:57 +00:00
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output.emplace_back((*pit)(0), (*pit)(1));
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2016-12-13 18:22:23 +00:00
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return output;
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2013-11-23 17:29:25 +00:00
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}
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2016-12-13 20:30:56 +00:00
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ClipperLib::Paths Slic3rMultiPoints_to_ClipperPaths(const Polygons &input)
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{
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ClipperLib::Paths retval;
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for (Polygons::const_iterator it = input.begin(); it != input.end(); ++it)
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2019-04-03 08:17:57 +00:00
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retval.emplace_back(Slic3rMultiPoint_to_ClipperPath(*it));
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2016-12-13 20:30:56 +00:00
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return retval;
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}
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2019-09-24 12:54:33 +00:00
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ClipperLib::Paths Slic3rMultiPoints_to_ClipperPaths(const ExPolygons &input)
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{
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ClipperLib::Paths retval;
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for (auto &ep : input) {
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retval.emplace_back(Slic3rMultiPoint_to_ClipperPath(ep.contour));
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for (auto &h : ep.holes)
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retval.emplace_back(Slic3rMultiPoint_to_ClipperPath(h));
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}
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return retval;
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}
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2016-12-13 20:30:56 +00:00
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ClipperLib::Paths Slic3rMultiPoints_to_ClipperPaths(const Polylines &input)
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2013-07-16 22:48:29 +00:00
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{
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2016-12-13 18:22:23 +00:00
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ClipperLib::Paths retval;
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2016-12-13 20:30:56 +00:00
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for (Polylines::const_iterator it = input.begin(); it != input.end(); ++it)
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2019-04-03 08:17:57 +00:00
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retval.emplace_back(Slic3rMultiPoint_to_ClipperPath(*it));
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2016-12-13 18:22:23 +00:00
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return retval;
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}
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2016-12-13 18:39:20 +00:00
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ClipperLib::Paths _offset(ClipperLib::Paths &&input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit)
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2016-12-13 18:22:23 +00:00
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{
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// scale input
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scaleClipperPolygons(input);
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2013-07-16 22:48:29 +00:00
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// perform offset
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2016-12-13 18:22:23 +00:00
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ClipperLib::ClipperOffset co;
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if (joinType == jtRound)
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co.ArcTolerance = miterLimit;
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else
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co.MiterLimit = miterLimit;
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2017-04-04 09:17:25 +00:00
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float delta_scaled = delta * float(CLIPPER_OFFSET_SCALE);
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co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
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2016-12-13 18:22:23 +00:00
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co.AddPaths(input, joinType, endType);
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ClipperLib::Paths retval;
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2017-04-04 09:17:25 +00:00
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co.Execute(retval, delta_scaled);
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2013-07-16 19:04:14 +00:00
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2016-12-13 18:22:23 +00:00
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// unscale output
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unscaleClipperPolygons(retval);
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return retval;
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}
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2016-12-13 18:39:20 +00:00
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ClipperLib::Paths _offset(ClipperLib::Path &&input, ClipperLib::EndType endType, const float delta, ClipperLib::JoinType joinType, double miterLimit)
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2016-12-13 18:22:23 +00:00
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{
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ClipperLib::Paths paths;
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2019-04-03 08:17:57 +00:00
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paths.emplace_back(std::move(input));
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2016-12-13 18:39:20 +00:00
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return _offset(std::move(paths), endType, delta, joinType, miterLimit);
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2013-07-16 19:04:14 +00:00
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}
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2016-10-20 11:04:23 +00:00
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// This is a safe variant of the polygon offset, tailored for a single ExPolygon:
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// a single polygon with multiple non-overlapping holes.
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// Each contour and hole is offsetted separately, then the holes are subtracted from the outer contours.
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2016-12-13 18:22:23 +00:00
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ClipperLib::Paths _offset(const Slic3r::ExPolygon &expolygon, const float delta,
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2016-11-28 16:33:17 +00:00
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ClipperLib::JoinType joinType, double miterLimit)
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2016-10-20 11:04:23 +00:00
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{
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// printf("new ExPolygon offset\n");
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// 1) Offset the outer contour.
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2016-11-28 16:33:17 +00:00
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const float delta_scaled = delta * float(CLIPPER_OFFSET_SCALE);
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2016-10-20 11:04:23 +00:00
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ClipperLib::Paths contours;
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{
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2016-12-13 18:22:23 +00:00
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ClipperLib::Path input = Slic3rMultiPoint_to_ClipperPath(expolygon.contour);
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2016-11-28 16:33:17 +00:00
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scaleClipperPolygon(input);
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2016-10-20 11:04:23 +00:00
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ClipperLib::ClipperOffset co;
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if (joinType == jtRound)
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2016-11-28 16:33:17 +00:00
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co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
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2016-10-20 11:04:23 +00:00
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else
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co.MiterLimit = miterLimit;
|
2017-04-04 09:17:25 +00:00
|
|
|
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
|
2016-10-20 11:04:23 +00:00
|
|
|
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
|
|
|
|
co.Execute(contours, delta_scaled);
|
|
|
|
}
|
|
|
|
|
|
|
|
// 2) Offset the holes one by one, collect the results.
|
|
|
|
ClipperLib::Paths holes;
|
|
|
|
{
|
|
|
|
holes.reserve(expolygon.holes.size());
|
|
|
|
for (Polygons::const_iterator it_hole = expolygon.holes.begin(); it_hole != expolygon.holes.end(); ++ it_hole) {
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Path input = Slic3rMultiPoint_to_ClipperPath_reversed(*it_hole);
|
2016-11-28 16:33:17 +00:00
|
|
|
scaleClipperPolygon(input);
|
2016-10-20 11:04:23 +00:00
|
|
|
ClipperLib::ClipperOffset co;
|
|
|
|
if (joinType == jtRound)
|
2016-11-28 16:33:17 +00:00
|
|
|
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
|
2016-10-20 11:04:23 +00:00
|
|
|
else
|
|
|
|
co.MiterLimit = miterLimit;
|
2017-04-04 09:17:25 +00:00
|
|
|
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
|
2016-10-20 11:04:23 +00:00
|
|
|
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
|
|
|
|
ClipperLib::Paths out;
|
|
|
|
co.Execute(out, - delta_scaled);
|
|
|
|
holes.insert(holes.end(), out.begin(), out.end());
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// 3) Subtract holes from the contours.
|
|
|
|
ClipperLib::Paths output;
|
2017-01-02 15:51:43 +00:00
|
|
|
if (holes.empty()) {
|
|
|
|
output = std::move(contours);
|
|
|
|
} else {
|
2016-10-20 11:04:23 +00:00
|
|
|
ClipperLib::Clipper clipper;
|
|
|
|
clipper.Clear();
|
|
|
|
clipper.AddPaths(contours, ClipperLib::ptSubject, true);
|
|
|
|
clipper.AddPaths(holes, ClipperLib::ptClip, true);
|
2016-12-13 18:22:23 +00:00
|
|
|
clipper.Execute(ClipperLib::ctDifference, output, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
|
2016-10-20 11:04:23 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// 4) Unscale the output.
|
2016-12-13 18:22:23 +00:00
|
|
|
unscaleClipperPolygons(output);
|
|
|
|
return output;
|
2016-11-07 21:49:11 +00:00
|
|
|
}
|
|
|
|
|
2017-01-02 15:51:43 +00:00
|
|
|
// This is a safe variant of the polygons offset, tailored for multiple ExPolygons.
|
|
|
|
// It is required, that the input expolygons do not overlap and that the holes of each ExPolygon don't intersect with their respective outer contours.
|
|
|
|
// Each ExPolygon is offsetted separately, then the offsetted ExPolygons are united.
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths _offset(const Slic3r::ExPolygons &expolygons, const float delta,
|
2016-11-28 16:33:17 +00:00
|
|
|
ClipperLib::JoinType joinType, double miterLimit)
|
2016-11-07 21:49:11 +00:00
|
|
|
{
|
2016-11-28 16:33:17 +00:00
|
|
|
const float delta_scaled = delta * float(CLIPPER_OFFSET_SCALE);
|
2017-01-02 15:51:43 +00:00
|
|
|
// Offsetted ExPolygons before they are united.
|
|
|
|
ClipperLib::Paths contours_cummulative;
|
|
|
|
contours_cummulative.reserve(expolygons.size());
|
|
|
|
// How many non-empty offsetted expolygons were actually collected into contours_cummulative?
|
|
|
|
// If only one, then there is no need to do a final union.
|
|
|
|
size_t expolygons_collected = 0;
|
2016-11-07 21:49:11 +00:00
|
|
|
for (Slic3r::ExPolygons::const_iterator it_expoly = expolygons.begin(); it_expoly != expolygons.end(); ++ it_expoly) {
|
|
|
|
// 1) Offset the outer contour.
|
2017-01-02 15:51:43 +00:00
|
|
|
ClipperLib::Paths contours;
|
2016-11-07 21:49:11 +00:00
|
|
|
{
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Path input = Slic3rMultiPoint_to_ClipperPath(it_expoly->contour);
|
2016-11-28 16:33:17 +00:00
|
|
|
scaleClipperPolygon(input);
|
2016-11-07 21:49:11 +00:00
|
|
|
ClipperLib::ClipperOffset co;
|
|
|
|
if (joinType == jtRound)
|
2016-11-28 16:33:17 +00:00
|
|
|
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
|
2016-11-07 21:49:11 +00:00
|
|
|
else
|
|
|
|
co.MiterLimit = miterLimit;
|
2017-04-04 09:17:25 +00:00
|
|
|
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
|
2016-11-07 21:49:11 +00:00
|
|
|
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
|
2017-01-02 15:51:43 +00:00
|
|
|
co.Execute(contours, delta_scaled);
|
2016-11-07 21:49:11 +00:00
|
|
|
}
|
2017-01-02 15:51:43 +00:00
|
|
|
if (contours.empty())
|
|
|
|
// No need to try to offset the holes.
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (it_expoly->holes.empty()) {
|
|
|
|
// No need to subtract holes from the offsetted expolygon, we are done.
|
|
|
|
contours_cummulative.insert(contours_cummulative.end(), contours.begin(), contours.end());
|
|
|
|
++ expolygons_collected;
|
|
|
|
} else {
|
|
|
|
// 2) Offset the holes one by one, collect the offsetted holes.
|
|
|
|
ClipperLib::Paths holes;
|
|
|
|
{
|
|
|
|
for (Polygons::const_iterator it_hole = it_expoly->holes.begin(); it_hole != it_expoly->holes.end(); ++ it_hole) {
|
|
|
|
ClipperLib::Path input = Slic3rMultiPoint_to_ClipperPath_reversed(*it_hole);
|
|
|
|
scaleClipperPolygon(input);
|
|
|
|
ClipperLib::ClipperOffset co;
|
|
|
|
if (joinType == jtRound)
|
|
|
|
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
|
|
|
|
else
|
|
|
|
co.MiterLimit = miterLimit;
|
2017-04-04 09:17:25 +00:00
|
|
|
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
|
2017-01-02 15:51:43 +00:00
|
|
|
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
|
|
|
|
ClipperLib::Paths out;
|
|
|
|
co.Execute(out, - delta_scaled);
|
|
|
|
holes.insert(holes.end(), out.begin(), out.end());
|
|
|
|
}
|
|
|
|
}
|
2016-11-07 21:49:11 +00:00
|
|
|
|
2017-01-02 15:51:43 +00:00
|
|
|
// 3) Subtract holes from the contours.
|
|
|
|
if (holes.empty()) {
|
|
|
|
// No hole remaining after an offset. Just copy the outer contour.
|
|
|
|
contours_cummulative.insert(contours_cummulative.end(), contours.begin(), contours.end());
|
|
|
|
++ expolygons_collected;
|
|
|
|
} else if (delta < 0) {
|
|
|
|
// Negative offset. There is a chance, that the offsetted hole intersects the outer contour.
|
|
|
|
// Subtract the offsetted holes from the offsetted contours.
|
|
|
|
ClipperLib::Clipper clipper;
|
|
|
|
clipper.Clear();
|
|
|
|
clipper.AddPaths(contours, ClipperLib::ptSubject, true);
|
|
|
|
clipper.AddPaths(holes, ClipperLib::ptClip, true);
|
|
|
|
ClipperLib::Paths output;
|
|
|
|
clipper.Execute(ClipperLib::ctDifference, output, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
|
|
|
|
if (! output.empty()) {
|
|
|
|
contours_cummulative.insert(contours_cummulative.end(), output.begin(), output.end());
|
|
|
|
++ expolygons_collected;
|
|
|
|
} else {
|
|
|
|
// The offsetted holes have eaten up the offsetted outer contour.
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
// Positive offset. As long as the Clipper offset does what one expects it to do, the offsetted hole will have a smaller
|
|
|
|
// area than the original hole or even disappear, therefore there will be no new intersections.
|
|
|
|
// Just collect the reversed holes.
|
|
|
|
contours_cummulative.reserve(contours.size() + holes.size());
|
|
|
|
contours_cummulative.insert(contours_cummulative.end(), contours.begin(), contours.end());
|
|
|
|
// Reverse the holes in place.
|
|
|
|
for (size_t i = 0; i < holes.size(); ++ i)
|
|
|
|
std::reverse(holes[i].begin(), holes[i].end());
|
|
|
|
contours_cummulative.insert(contours_cummulative.end(), holes.begin(), holes.end());
|
|
|
|
++ expolygons_collected;
|
2016-11-07 21:49:11 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2017-01-02 15:51:43 +00:00
|
|
|
// 4) Unite the offsetted expolygons.
|
2016-11-07 21:49:11 +00:00
|
|
|
ClipperLib::Paths output;
|
2017-01-02 15:51:43 +00:00
|
|
|
if (expolygons_collected > 1 && delta > 0) {
|
|
|
|
// There is a chance that the outwards offsetted expolygons may intersect. Perform a union.
|
2016-11-07 21:49:11 +00:00
|
|
|
ClipperLib::Clipper clipper;
|
2017-01-02 15:51:43 +00:00
|
|
|
clipper.Clear();
|
|
|
|
clipper.AddPaths(contours_cummulative, ClipperLib::ptSubject, true);
|
|
|
|
clipper.Execute(ClipperLib::ctUnion, output, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
|
|
|
|
} else {
|
|
|
|
// Negative offset. The shrunk expolygons shall not mutually intersect. Just copy the output.
|
|
|
|
output = std::move(contours_cummulative);
|
2016-11-07 21:49:11 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// 4) Unscale the output.
|
2016-12-13 18:22:23 +00:00
|
|
|
unscaleClipperPolygons(output);
|
|
|
|
return output;
|
2016-11-07 21:49:11 +00:00
|
|
|
}
|
|
|
|
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths
|
|
|
|
_offset2(const Polygons &polygons, const float delta1, const float delta2,
|
|
|
|
const ClipperLib::JoinType joinType, const double miterLimit)
|
2016-11-07 21:49:11 +00:00
|
|
|
{
|
2013-07-16 19:04:14 +00:00
|
|
|
// read input
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths input = Slic3rMultiPoints_to_ClipperPaths(polygons);
|
2013-07-16 19:04:14 +00:00
|
|
|
|
|
|
|
// scale input
|
2016-11-28 16:33:17 +00:00
|
|
|
scaleClipperPolygons(input);
|
2013-12-24 11:40:46 +00:00
|
|
|
|
|
|
|
// prepare ClipperOffset object
|
|
|
|
ClipperLib::ClipperOffset co;
|
|
|
|
if (joinType == jtRound) {
|
2016-12-13 18:22:23 +00:00
|
|
|
co.ArcTolerance = miterLimit;
|
2013-12-24 11:40:46 +00:00
|
|
|
} else {
|
|
|
|
co.MiterLimit = miterLimit;
|
|
|
|
}
|
2017-04-04 09:17:25 +00:00
|
|
|
float delta_scaled1 = delta1 * float(CLIPPER_OFFSET_SCALE);
|
|
|
|
float delta_scaled2 = delta2 * float(CLIPPER_OFFSET_SCALE);
|
|
|
|
co.ShortestEdgeLength = double(std::max(std::abs(delta_scaled1), std::abs(delta_scaled2)) * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR);
|
2013-07-16 19:04:14 +00:00
|
|
|
|
|
|
|
// perform first offset
|
2013-12-24 11:40:46 +00:00
|
|
|
ClipperLib::Paths output1;
|
|
|
|
co.AddPaths(input, joinType, ClipperLib::etClosedPolygon);
|
2017-04-04 09:17:25 +00:00
|
|
|
co.Execute(output1, delta_scaled1);
|
2013-07-16 19:04:14 +00:00
|
|
|
|
|
|
|
// perform second offset
|
2013-12-24 11:40:46 +00:00
|
|
|
co.Clear();
|
|
|
|
co.AddPaths(output1, joinType, ClipperLib::etClosedPolygon);
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths retval;
|
2017-04-04 09:17:25 +00:00
|
|
|
co.Execute(retval, delta_scaled2);
|
2016-12-13 18:22:23 +00:00
|
|
|
|
2013-07-16 19:04:14 +00:00
|
|
|
// unscale output
|
2016-12-13 18:22:23 +00:00
|
|
|
unscaleClipperPolygons(retval);
|
|
|
|
return retval;
|
2013-07-16 22:48:29 +00:00
|
|
|
}
|
|
|
|
|
2016-12-13 18:22:23 +00:00
|
|
|
Polygons
|
|
|
|
offset2(const Polygons &polygons, const float delta1, const float delta2,
|
|
|
|
const ClipperLib::JoinType joinType, const double miterLimit)
|
2013-07-16 22:48:29 +00:00
|
|
|
{
|
|
|
|
// perform offset
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths output = _offset2(polygons, delta1, delta2, joinType, miterLimit);
|
2013-07-16 22:48:29 +00:00
|
|
|
|
|
|
|
// convert into ExPolygons
|
2016-12-13 20:30:56 +00:00
|
|
|
return ClipperPaths_to_Slic3rPolygons(output);
|
2015-07-23 13:53:02 +00:00
|
|
|
}
|
|
|
|
|
2016-12-13 18:22:23 +00:00
|
|
|
ExPolygons
|
|
|
|
offset2_ex(const Polygons &polygons, const float delta1, const float delta2,
|
|
|
|
const ClipperLib::JoinType joinType, const double miterLimit)
|
2013-07-16 22:48:29 +00:00
|
|
|
{
|
|
|
|
// perform offset
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths output = _offset2(polygons, delta1, delta2, joinType, miterLimit);
|
2013-07-16 19:04:14 +00:00
|
|
|
|
|
|
|
// convert into ExPolygons
|
2016-12-13 18:22:23 +00:00
|
|
|
return ClipperPaths_to_Slic3rExPolygons(output);
|
2015-07-23 13:53:02 +00:00
|
|
|
}
|
|
|
|
|
2018-05-18 07:52:09 +00:00
|
|
|
//FIXME Vojtech: This functon may likely be optimized to avoid some of the Slic3r to Clipper
|
|
|
|
// conversions and unnecessary Clipper calls.
|
|
|
|
ExPolygons offset2_ex(const ExPolygons &expolygons, const float delta1,
|
|
|
|
const float delta2, ClipperLib::JoinType joinType, double miterLimit)
|
|
|
|
{
|
|
|
|
Polygons polys;
|
|
|
|
for (const ExPolygon &expoly : expolygons)
|
|
|
|
append(polys,
|
|
|
|
offset(offset_ex(expoly, delta1, joinType, miterLimit),
|
|
|
|
delta2, joinType, miterLimit));
|
|
|
|
return union_ex(polys);
|
|
|
|
}
|
|
|
|
|
2019-09-24 12:54:33 +00:00
|
|
|
template<class T, class TSubj, class TClip>
|
|
|
|
T _clipper_do(const ClipperLib::ClipType clipType,
|
|
|
|
TSubj && subject,
|
|
|
|
TClip && clip,
|
|
|
|
const ClipperLib::PolyFillType fillType,
|
|
|
|
const bool safety_offset_)
|
2013-07-16 19:04:14 +00:00
|
|
|
{
|
|
|
|
// read input
|
2019-09-24 12:54:33 +00:00
|
|
|
ClipperLib::Paths input_subject = Slic3rMultiPoints_to_ClipperPaths(std::forward<TSubj>(subject));
|
|
|
|
ClipperLib::Paths input_clip = Slic3rMultiPoints_to_ClipperPaths(std::forward<TClip>(clip));
|
2013-07-16 19:04:14 +00:00
|
|
|
|
|
|
|
// perform safety offset
|
2013-08-26 15:58:37 +00:00
|
|
|
if (safety_offset_) {
|
2013-07-16 22:29:09 +00:00
|
|
|
if (clipType == ClipperLib::ctUnion) {
|
2014-05-08 13:00:49 +00:00
|
|
|
safety_offset(&input_subject);
|
2013-07-16 22:29:09 +00:00
|
|
|
} else {
|
2014-05-08 13:00:49 +00:00
|
|
|
safety_offset(&input_clip);
|
2013-07-16 22:29:09 +00:00
|
|
|
}
|
2013-07-16 19:04:14 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// init Clipper
|
|
|
|
ClipperLib::Clipper clipper;
|
|
|
|
clipper.Clear();
|
|
|
|
|
|
|
|
// add polygons
|
2016-12-13 18:22:23 +00:00
|
|
|
clipper.AddPaths(input_subject, ClipperLib::ptSubject, true);
|
|
|
|
clipper.AddPaths(input_clip, ClipperLib::ptClip, true);
|
2013-07-16 19:04:14 +00:00
|
|
|
|
2013-07-16 23:21:30 +00:00
|
|
|
// perform operation
|
2016-12-13 18:22:23 +00:00
|
|
|
T retval;
|
|
|
|
clipper.Execute(clipType, retval, fillType, fillType);
|
|
|
|
return retval;
|
2013-07-16 23:21:30 +00:00
|
|
|
}
|
|
|
|
|
2017-03-02 15:39:43 +00:00
|
|
|
// Fix of #117: A large fractal pyramid takes ages to slice
|
|
|
|
// The Clipper library has difficulties processing overlapping polygons.
|
|
|
|
// Namely, the function Clipper::JoinCommonEdges() has potentially a terrible time complexity if the output
|
|
|
|
// of the operation is of the PolyTree type.
|
|
|
|
// This function implmenets a following workaround:
|
|
|
|
// 1) Peform the Clipper operation with the output to Paths. This method handles overlaps in a reasonable time.
|
|
|
|
// 2) Run Clipper Union once again to extract the PolyTree from the result of 1).
|
|
|
|
inline ClipperLib::PolyTree _clipper_do_polytree2(const ClipperLib::ClipType clipType, const Polygons &subject,
|
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const Polygons &clip, const ClipperLib::PolyFillType fillType, const bool safety_offset_)
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{
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// read input
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ClipperLib::Paths input_subject = Slic3rMultiPoints_to_ClipperPaths(subject);
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ClipperLib::Paths input_clip = Slic3rMultiPoints_to_ClipperPaths(clip);
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// perform safety offset
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2017-08-02 12:24:32 +00:00
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if (safety_offset_)
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safety_offset((clipType == ClipperLib::ctUnion) ? &input_subject : &input_clip);
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2017-03-02 15:39:43 +00:00
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ClipperLib::Clipper clipper;
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clipper.AddPaths(input_subject, ClipperLib::ptSubject, true);
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clipper.AddPaths(input_clip, ClipperLib::ptClip, true);
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// Perform the operation with the output to input_subject.
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// This pass does not generate a PolyTree, which is a very expensive operation with the current Clipper library
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// if there are overapping edges.
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clipper.Execute(clipType, input_subject, fillType, fillType);
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// Perform an additional Union operation to generate the PolyTree ordering.
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clipper.Clear();
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clipper.AddPaths(input_subject, ClipperLib::ptSubject, true);
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ClipperLib::PolyTree retval;
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clipper.Execute(ClipperLib::ctUnion, retval, fillType, fillType);
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return retval;
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}
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2017-08-02 12:24:32 +00:00
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ClipperLib::PolyTree _clipper_do_pl(const ClipperLib::ClipType clipType, const Polylines &subject,
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2016-12-13 18:22:23 +00:00
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const Polygons &clip, const ClipperLib::PolyFillType fillType,
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2014-05-08 09:07:37 +00:00
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const bool safety_offset_)
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2013-11-21 13:15:38 +00:00
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{
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// read input
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2016-12-13 18:22:23 +00:00
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ClipperLib::Paths input_subject = Slic3rMultiPoints_to_ClipperPaths(subject);
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ClipperLib::Paths input_clip = Slic3rMultiPoints_to_ClipperPaths(clip);
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2014-05-08 09:07:37 +00:00
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// perform safety offset
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if (safety_offset_) safety_offset(&input_clip);
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2013-11-21 13:15:38 +00:00
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// init Clipper
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ClipperLib::Clipper clipper;
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clipper.Clear();
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// add polygons
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2016-12-13 18:22:23 +00:00
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clipper.AddPaths(input_subject, ClipperLib::ptSubject, false);
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clipper.AddPaths(input_clip, ClipperLib::ptClip, true);
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2013-11-21 13:15:38 +00:00
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// perform operation
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2016-12-13 18:22:23 +00:00
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ClipperLib::PolyTree retval;
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clipper.Execute(clipType, retval, fillType, fillType);
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return retval;
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2013-11-21 13:15:38 +00:00
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}
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2017-08-02 12:24:32 +00:00
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Polygons _clipper(ClipperLib::ClipType clipType, const Polygons &subject, const Polygons &clip, bool safety_offset_)
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2013-07-16 23:21:30 +00:00
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{
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2016-12-13 20:30:56 +00:00
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return ClipperPaths_to_Slic3rPolygons(_clipper_do<ClipperLib::Paths>(clipType, subject, clip, ClipperLib::pftNonZero, safety_offset_));
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2013-07-16 23:21:30 +00:00
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}
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2017-08-02 12:24:32 +00:00
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ExPolygons _clipper_ex(ClipperLib::ClipType clipType, const Polygons &subject, const Polygons &clip, bool safety_offset_)
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2013-07-16 23:21:30 +00:00
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{
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2017-03-02 15:39:43 +00:00
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ClipperLib::PolyTree polytree = _clipper_do_polytree2(clipType, subject, clip, ClipperLib::pftNonZero, safety_offset_);
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2016-12-13 18:52:28 +00:00
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return PolyTreeToExPolygons(polytree);
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2013-07-16 19:04:14 +00:00
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}
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2017-08-02 12:24:32 +00:00
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Polylines _clipper_pl(ClipperLib::ClipType clipType, const Polylines &subject, const Polygons &clip, bool safety_offset_)
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2013-11-21 13:15:38 +00:00
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{
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ClipperLib::Paths output;
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2016-12-13 21:13:02 +00:00
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ClipperLib::PolyTreeToPaths(_clipper_do_pl(clipType, subject, clip, ClipperLib::pftNonZero, safety_offset_), output);
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2016-12-13 20:30:56 +00:00
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return ClipperPaths_to_Slic3rPolylines(output);
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2014-11-15 21:41:22 +00:00
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}
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2017-08-02 12:24:32 +00:00
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Polylines _clipper_pl(ClipperLib::ClipType clipType, const Polygons &subject, const Polygons &clip, bool safety_offset_)
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2014-05-21 13:03:31 +00:00
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{
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// transform input polygons into polylines
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2016-12-13 18:22:23 +00:00
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Polylines polylines;
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2014-05-21 13:03:31 +00:00
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polylines.reserve(subject.size());
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2016-12-13 18:22:23 +00:00
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for (Polygons::const_iterator polygon = subject.begin(); polygon != subject.end(); ++polygon)
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2019-04-03 08:17:57 +00:00
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polylines.emplace_back(polygon->operator Polyline()); // implicit call to split_at_first_point()
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2014-05-21 13:03:31 +00:00
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// perform clipping
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2016-12-13 18:22:23 +00:00
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Polylines retval = _clipper_pl(clipType, polylines, clip, safety_offset_);
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2014-05-08 09:07:37 +00:00
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/* If the split_at_first_point() call above happens to split the polygon inside the clipping area
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we would get two consecutive polylines instead of a single one, so we go through them in order
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to recombine continuous polylines. */
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2016-12-13 18:22:23 +00:00
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for (size_t i = 0; i < retval.size(); ++i) {
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for (size_t j = i+1; j < retval.size(); ++j) {
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2018-08-15 11:51:40 +00:00
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if (retval[i].points.back() == retval[j].points.front()) {
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2014-05-08 09:07:37 +00:00
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/* If last point of i coincides with first point of j,
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append points of j to i and delete j */
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2016-12-13 18:22:23 +00:00
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retval[i].points.insert(retval[i].points.end(), retval[j].points.begin()+1, retval[j].points.end());
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retval.erase(retval.begin() + j);
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2014-05-08 09:07:37 +00:00
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--j;
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2018-08-15 11:51:40 +00:00
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} else if (retval[i].points.front() == retval[j].points.back()) {
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2014-05-08 09:07:37 +00:00
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/* If first point of i coincides with last point of j,
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prepend points of j to i and delete j */
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2016-12-13 18:22:23 +00:00
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retval[i].points.insert(retval[i].points.begin(), retval[j].points.begin(), retval[j].points.end()-1);
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retval.erase(retval.begin() + j);
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2014-05-08 09:07:37 +00:00
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--j;
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2018-08-15 11:51:40 +00:00
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} else if (retval[i].points.front() == retval[j].points.front()) {
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2014-05-08 09:07:37 +00:00
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/* Since Clipper does not preserve orientation of polylines,
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also check the case when first point of i coincides with first point of j. */
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2016-12-13 18:22:23 +00:00
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retval[j].reverse();
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retval[i].points.insert(retval[i].points.begin(), retval[j].points.begin(), retval[j].points.end()-1);
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retval.erase(retval.begin() + j);
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2014-05-08 09:07:37 +00:00
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--j;
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2018-08-15 11:51:40 +00:00
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} else if (retval[i].points.back() == retval[j].points.back()) {
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2014-05-08 09:07:37 +00:00
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/* Since Clipper does not preserve orientation of polylines,
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also check the case when last point of i coincides with last point of j. */
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2016-12-13 18:22:23 +00:00
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retval[j].reverse();
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retval[i].points.insert(retval[i].points.end(), retval[j].points.begin()+1, retval[j].points.end());
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retval.erase(retval.begin() + j);
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2014-05-08 09:07:37 +00:00
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--j;
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}
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}
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2014-12-24 09:20:55 +00:00
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}
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2016-12-13 18:22:23 +00:00
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return retval;
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2014-11-09 14:27:34 +00:00
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}
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2016-12-13 18:22:23 +00:00
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Lines
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_clipper_ln(ClipperLib::ClipType clipType, const Lines &subject, const Polygons &clip,
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2013-08-26 15:58:37 +00:00
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bool safety_offset_)
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2013-07-16 22:29:09 +00:00
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{
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2016-12-13 18:22:23 +00:00
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// convert Lines to Polylines
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Polylines polylines;
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polylines.reserve(subject.size());
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Removed Point::scale(),translate(),coincides_with(),distance_to(),
distance_to_squared(),perp_distance_to(),negative(),vector_to(),
translate(), distance_to() etc,
replaced with the Eigen equivalents.
2018-08-17 12:14:24 +00:00
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for (const Line &line : subject)
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polylines.emplace_back(Polyline(line.a, line.b));
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2016-12-13 18:22:23 +00:00
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// perform operation
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polylines = _clipper_pl(clipType, polylines, clip, safety_offset_);
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// convert Polylines to Lines
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Lines retval;
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for (Polylines::const_iterator polyline = polylines.begin(); polyline != polylines.end(); ++polyline)
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2019-04-03 09:17:15 +00:00
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retval.emplace_back(polyline->operator Line());
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2016-12-13 18:22:23 +00:00
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return retval;
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2015-12-02 18:32:57 +00:00
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}
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2019-09-24 12:54:33 +00:00
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ClipperLib::PolyTree union_pt(const Polygons &subject, bool safety_offset_)
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2014-11-09 14:27:34 +00:00
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{
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2016-12-13 18:22:23 +00:00
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return _clipper_do<ClipperLib::PolyTree>(ClipperLib::ctUnion, subject, Polygons(), ClipperLib::pftEvenOdd, safety_offset_);
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2014-11-09 14:27:34 +00:00
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}
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2019-09-24 12:54:33 +00:00
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ClipperLib::PolyTree union_pt(const ExPolygons &subject, bool safety_offset_)
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{
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return _clipper_do<ClipperLib::PolyTree>(ClipperLib::ctUnion, subject, Polygons(), ClipperLib::pftEvenOdd, safety_offset_);
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}
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ClipperLib::PolyTree union_pt(Polygons &&subject, bool safety_offset_)
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{
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return _clipper_do<ClipperLib::PolyTree>(ClipperLib::ctUnion, std::move(subject), Polygons(), ClipperLib::pftEvenOdd, safety_offset_);
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}
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ClipperLib::PolyTree union_pt(ExPolygons &&subject, bool safety_offset_)
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{
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return _clipper_do<ClipperLib::PolyTree>(ClipperLib::ctUnion, std::move(subject), Polygons(), ClipperLib::pftEvenOdd, safety_offset_);
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}
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2016-12-13 18:22:23 +00:00
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Polygons
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union_pt_chained(const Polygons &subject, bool safety_offset_)
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2016-10-24 12:07:38 +00:00
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{
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2016-12-13 18:22:23 +00:00
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ClipperLib::PolyTree polytree = union_pt(subject, safety_offset_);
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2016-10-24 12:07:38 +00:00
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Polygons retval;
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2016-12-13 18:22:23 +00:00
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traverse_pt(polytree.Childs, &retval);
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2016-10-24 12:07:38 +00:00
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return retval;
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}
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2019-09-24 12:54:33 +00:00
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static ClipperLib::PolyNodes order_nodes(const ClipperLib::PolyNodes &nodes)
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2013-11-23 22:21:59 +00:00
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{
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// collect ordering points
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Points ordering_points;
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ordering_points.reserve(nodes.size());
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2019-09-24 12:54:33 +00:00
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for (const ClipperLib::PolyNode *node : nodes)
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ordering_points.emplace_back(Point(node->Contour.front().X, node->Contour.front().Y));
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2013-11-23 22:21:59 +00:00
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// perform the ordering
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2019-09-26 15:30:03 +00:00
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ClipperLib::PolyNodes ordered_nodes = chain_clipper_polynodes(ordering_points, nodes);
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2019-09-24 12:54:33 +00:00
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return ordered_nodes;
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}
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enum class e_ordering {
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ORDER_POLYNODES,
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DONT_ORDER_POLYNODES
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};
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2019-09-26 15:30:03 +00:00
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2019-09-24 12:54:33 +00:00
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template<e_ordering o>
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void foreach_node(const ClipperLib::PolyNodes &nodes,
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std::function<void(const ClipperLib::PolyNode *)> fn);
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template<> void foreach_node<e_ordering::DONT_ORDER_POLYNODES>(
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const ClipperLib::PolyNodes & nodes,
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std::function<void(const ClipperLib::PolyNode *)> fn)
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{
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for (auto &n : nodes) fn(n);
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}
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template<> void foreach_node<e_ordering::ORDER_POLYNODES>(
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const ClipperLib::PolyNodes & nodes,
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std::function<void(const ClipperLib::PolyNode *)> fn)
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{
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auto ordered_nodes = order_nodes(nodes);
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for (auto &n : ordered_nodes) fn(n);
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}
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template<e_ordering o>
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void _traverse_pt(const ClipperLib::PolyNodes &nodes, Polygons *retval)
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{
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/* use a nearest neighbor search to order these children
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TODO: supply start_near to chained_path() too? */
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2013-11-23 22:21:59 +00:00
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// push results recursively
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2019-09-24 12:54:33 +00:00
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foreach_node<o>(nodes, [&retval](const ClipperLib::PolyNode *node) {
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2013-11-23 22:21:59 +00:00
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// traverse the next depth
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2019-09-24 12:54:33 +00:00
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_traverse_pt<o>(node->Childs, retval);
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retval->emplace_back(ClipperPath_to_Slic3rPolygon(node->Contour));
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if (node->IsHole()) retval->back().reverse(); // ccw
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});
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}
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template<e_ordering o>
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void _traverse_pt(const ClipperLib::PolyNode *tree, ExPolygons *retval)
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{
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if (!retval || !tree) return;
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ExPolygons &retv = *retval;
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std::function<void(const ClipperLib::PolyNode*, ExPolygon&)> hole_fn;
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auto contour_fn = [&retv, &hole_fn](const ClipperLib::PolyNode *pptr) {
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ExPolygon poly;
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poly.contour.points = ClipperPath_to_Slic3rPolygon(pptr->Contour);
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auto fn = std::bind(hole_fn, std::placeholders::_1, poly);
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foreach_node<o>(pptr->Childs, fn);
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retv.push_back(poly);
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};
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hole_fn = [&contour_fn](const ClipperLib::PolyNode *pptr, ExPolygon& poly)
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{
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poly.holes.emplace_back();
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poly.holes.back().points = ClipperPath_to_Slic3rPolygon(pptr->Contour);
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foreach_node<o>(pptr->Childs, contour_fn);
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};
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contour_fn(tree);
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}
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template<e_ordering o>
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void _traverse_pt(const ClipperLib::PolyNodes &nodes, ExPolygons *retval)
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{
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// Here is the actual traverse
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foreach_node<o>(nodes, [&retval](const ClipperLib::PolyNode *node) {
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_traverse_pt<o>(node, retval);
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});
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}
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void traverse_pt(const ClipperLib::PolyNode *tree, ExPolygons *retval)
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{
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_traverse_pt<e_ordering::ORDER_POLYNODES>(tree, retval);
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}
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void traverse_pt_unordered(const ClipperLib::PolyNode *tree, ExPolygons *retval)
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{
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_traverse_pt<e_ordering::DONT_ORDER_POLYNODES>(tree, retval);
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}
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void traverse_pt(const ClipperLib::PolyNodes &nodes, Polygons *retval)
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{
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_traverse_pt<e_ordering::ORDER_POLYNODES>(nodes, retval);
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}
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void traverse_pt(const ClipperLib::PolyNodes &nodes, ExPolygons *retval)
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{
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_traverse_pt<e_ordering::ORDER_POLYNODES>(nodes, retval);
|
|
|
|
}
|
|
|
|
|
|
|
|
void traverse_pt_unordered(const ClipperLib::PolyNodes &nodes, Polygons *retval)
|
|
|
|
{
|
|
|
|
_traverse_pt<e_ordering::DONT_ORDER_POLYNODES>(nodes, retval);
|
|
|
|
}
|
|
|
|
|
|
|
|
void traverse_pt_unordered(const ClipperLib::PolyNodes &nodes, ExPolygons *retval)
|
|
|
|
{
|
|
|
|
_traverse_pt<e_ordering::DONT_ORDER_POLYNODES>(nodes, retval);
|
2013-11-23 22:21:59 +00:00
|
|
|
}
|
|
|
|
|
2018-05-18 07:52:09 +00:00
|
|
|
Polygons simplify_polygons(const Polygons &subject, bool preserve_collinear)
|
2013-08-08 00:10:34 +00:00
|
|
|
{
|
|
|
|
// convert into Clipper polygons
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths input_subject = Slic3rMultiPoints_to_ClipperPaths(subject);
|
2014-05-01 08:37:38 +00:00
|
|
|
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths output;
|
2014-05-01 08:37:38 +00:00
|
|
|
if (preserve_collinear) {
|
|
|
|
ClipperLib::Clipper c;
|
|
|
|
c.PreserveCollinear(true);
|
|
|
|
c.StrictlySimple(true);
|
2014-05-08 13:00:49 +00:00
|
|
|
c.AddPaths(input_subject, ClipperLib::ptSubject, true);
|
|
|
|
c.Execute(ClipperLib::ctUnion, output, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
|
2014-05-01 08:37:38 +00:00
|
|
|
} else {
|
2014-05-08 13:00:49 +00:00
|
|
|
ClipperLib::SimplifyPolygons(input_subject, output, ClipperLib::pftNonZero);
|
2014-05-01 08:37:38 +00:00
|
|
|
}
|
|
|
|
|
2013-08-08 00:10:34 +00:00
|
|
|
// convert into Slic3r polygons
|
2016-12-13 20:30:56 +00:00
|
|
|
return ClipperPaths_to_Slic3rPolygons(output);
|
2013-08-08 00:10:34 +00:00
|
|
|
}
|
|
|
|
|
2018-05-18 07:52:09 +00:00
|
|
|
ExPolygons simplify_polygons_ex(const Polygons &subject, bool preserve_collinear)
|
2014-05-01 10:07:11 +00:00
|
|
|
{
|
2018-05-18 07:52:09 +00:00
|
|
|
if (! preserve_collinear)
|
|
|
|
return union_ex(simplify_polygons(subject, false));
|
|
|
|
|
2014-05-01 10:07:11 +00:00
|
|
|
// convert into Clipper polygons
|
2016-12-13 18:22:23 +00:00
|
|
|
ClipperLib::Paths input_subject = Slic3rMultiPoints_to_ClipperPaths(subject);
|
2014-05-01 10:07:11 +00:00
|
|
|
|
|
|
|
ClipperLib::PolyTree polytree;
|
|
|
|
|
|
|
|
ClipperLib::Clipper c;
|
|
|
|
c.PreserveCollinear(true);
|
|
|
|
c.StrictlySimple(true);
|
|
|
|
c.AddPaths(input_subject, ClipperLib::ptSubject, true);
|
|
|
|
c.Execute(ClipperLib::ctUnion, polytree, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
|
|
|
|
|
|
|
|
// convert into ExPolygons
|
2016-12-13 18:22:23 +00:00
|
|
|
return PolyTreeToExPolygons(polytree);
|
2014-05-01 10:07:11 +00:00
|
|
|
}
|
|
|
|
|
2014-05-08 09:07:37 +00:00
|
|
|
void safety_offset(ClipperLib::Paths* paths)
|
2013-08-26 15:58:37 +00:00
|
|
|
{
|
2016-11-16 21:12:58 +00:00
|
|
|
PROFILE_FUNC();
|
|
|
|
|
2013-08-26 15:58:37 +00:00
|
|
|
// scale input
|
2016-11-28 16:33:17 +00:00
|
|
|
scaleClipperPolygons(*paths);
|
2013-08-26 15:58:37 +00:00
|
|
|
|
|
|
|
// perform offset (delta = scale 1e-05)
|
2013-12-24 11:40:46 +00:00
|
|
|
ClipperLib::ClipperOffset co;
|
2016-11-28 16:33:17 +00:00
|
|
|
#ifdef CLIPPER_UTILS_DEBUG
|
2016-12-13 18:22:23 +00:00
|
|
|
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());
|
|
|
|
}
|
2016-11-28 16:33:17 +00:00
|
|
|
#endif /* CLIPPER_UTILS_DEBUG */
|
|
|
|
ClipperLib::Paths out;
|
|
|
|
for (size_t i = 0; i < paths->size(); ++ i) {
|
2016-11-29 18:26:26 +00:00
|
|
|
ClipperLib::Path &path = (*paths)[i];
|
2016-12-13 18:22:23 +00:00
|
|
|
co.Clear();
|
2016-11-28 16:33:17 +00:00
|
|
|
co.MiterLimit = 2;
|
2016-11-29 18:26:26 +00:00
|
|
|
bool ccw = ClipperLib::Orientation(path);
|
|
|
|
if (! ccw)
|
|
|
|
std::reverse(path.begin(), path.end());
|
2016-11-28 16:33:17 +00:00
|
|
|
{
|
|
|
|
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;
|
2016-11-29 18:26:26 +00:00
|
|
|
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());
|
|
|
|
}
|
2016-11-28 16:33:17 +00:00
|
|
|
if (out.empty())
|
|
|
|
out = std::move(out_this);
|
|
|
|
else
|
|
|
|
std::move(std::begin(out_this), std::end(out_this), std::back_inserter(out));
|
|
|
|
}
|
2016-11-16 21:12:58 +00:00
|
|
|
}
|
2016-11-28 16:33:17 +00:00
|
|
|
*paths = std::move(out);
|
2013-08-26 15:58:37 +00:00
|
|
|
|
|
|
|
// unscale output
|
2016-11-28 16:33:17 +00:00
|
|
|
unscaleClipperPolygons(*paths);
|
2013-08-26 15:58:37 +00:00
|
|
|
}
|
|
|
|
|
2016-11-23 14:51:47 +00:00
|
|
|
Polygons top_level_islands(const Slic3r::Polygons &polygons)
|
|
|
|
{
|
|
|
|
// init Clipper
|
|
|
|
ClipperLib::Clipper clipper;
|
|
|
|
clipper.Clear();
|
|
|
|
// perform union
|
2016-12-13 18:22:23 +00:00
|
|
|
clipper.AddPaths(Slic3rMultiPoints_to_ClipperPaths(polygons), ClipperLib::ptSubject, true);
|
2016-11-23 14:51:47 +00:00
|
|
|
ClipperLib::PolyTree polytree;
|
|
|
|
clipper.Execute(ClipperLib::ctUnion, polytree, ClipperLib::pftEvenOdd, ClipperLib::pftEvenOdd);
|
|
|
|
// Convert only the top level islands to the output.
|
|
|
|
Polygons out;
|
|
|
|
out.reserve(polytree.ChildCount());
|
2016-12-13 18:22:23 +00:00
|
|
|
for (int i = 0; i < polytree.ChildCount(); ++i)
|
2019-04-03 08:17:57 +00:00
|
|
|
out.emplace_back(ClipperPath_to_Slic3rPolygon(polytree.Childs[i]->Contour));
|
2016-11-23 14:51:47 +00:00
|
|
|
return out;
|
2013-07-16 19:04:14 +00:00
|
|
|
}
|
2016-11-23 14:51:47 +00:00
|
|
|
|
2019-04-03 08:17:57 +00:00
|
|
|
}
|