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_)
{
// read input
ClipperLib::Paths* input_subject = new ClipperLib::Paths();
ClipperLib::Paths* input_clip = new ClipperLib::Paths();
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
clipper.AddPaths(*input_subject, ClipperLib::ptSubject, true);
delete input_subject;
clipper.AddPaths(*input_clip, ClipperLib::ptClip, true);
delete input_clip;
// perform operation
clipper.Execute(clipType, retval, fillType, fillType);
}
T
_clipper_do(const ClipperLib::ClipType clipType, const Polygons &subject,
const Polygons &clip, const ClipperLib::PolyFillType fillType, const bool safety_offset_)
{
// read input
ClipperLib::Paths input_subject = Slic3rMultiPoints_to_ClipperPaths(subject);
ClipperLib::Paths input_clip = Slic3rMultiPoints_to_ClipperPaths(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
clipper.AddPaths(input_subject, ClipperLib::ptSubject, true);
clipper.AddPaths(input_clip, ClipperLib::ptClip, true);
// perform operation
T retval;
clipper.Execute(clipType, retval, fillType, fillType);
return retval;
}
void _clipper_do(const ClipperLib::ClipType clipType, const Slic3r::Polylines &subject,
const Slic3r::Polygons &clip, ClipperLib::PolyTree* retval, const ClipperLib::PolyFillType fillType,
const bool safety_offset_)
{
PROFILE_BLOCK(_clipper_do_polylines);
// 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_) safety_offset(&input_clip);
// init Clipper
ClipperLib::Clipper clipper;
clipper.Clear();
// add polygons
{
PROFILE_BLOCK(_clipper_do_polylines_AddPaths);
clipper.AddPaths(input_subject, ClipperLib::ptSubject, false);
clipper.AddPaths(input_clip, ClipperLib::ptClip, true);
}
// perform operation
{
PROFILE_BLOCK(_clipper_do_polylines_Execute);
clipper.Execute(clipType, *retval, fillType, fillType);
}
}
// 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,
const Polygons &clip, const ClipperLib::PolyFillType fillType, const bool safety_offset_)
{
// read input
ClipperLib::Paths input_subject = Slic3rMultiPoints_to_ClipperPaths(subject);
ClipperLib::Paths input_clip = Slic3rMultiPoints_to_ClipperPaths(clip);
// perform safety offset
if (safety_offset_)
safety_offset((clipType == ClipperLib::ctUnion) ? &input_subject : &input_clip);
ClipperLib::Clipper clipper;
clipper.AddPaths(input_subject, ClipperLib::ptSubject, true);
clipper.AddPaths(input_clip, ClipperLib::ptClip, true);
// Perform the operation with the output to input_subject.
// This pass does not generate a PolyTree, which is a very expensive operation with the current Clipper library
// if there are overapping edges.
clipper.Execute(clipType, input_subject, fillType, fillType);
// Perform an additional Union operation to generate the PolyTree ordering.
clipper.Clear();
clipper.AddPaths(input_subject, ClipperLib::ptSubject, true);
ClipperLib::PolyTree retval;
clipper.Execute(ClipperLib::ctUnion, retval, fillType, fillType);
return retval;
}
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);
}
}