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Slic3r/xs/src/ClipperUtils.cpp

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#include "ClipperUtils.hpp"
#include "Geometry.hpp"
namespace Slic3r {
//-----------------------------------------------------------
// legacy code from Clipper documentation
void AddOuterPolyNodeToExPolygons(ClipperLib::PolyNode& polynode, Slic3r::ExPolygons& expolygons)
{
size_t cnt = expolygons.size();
expolygons.resize(cnt + 1);
ClipperPath_to_Slic3rMultiPoint(polynode.Contour, expolygons[cnt].contour);
expolygons[cnt].holes.resize(polynode.ChildCount());
for (int i = 0; i < polynode.ChildCount(); ++i)
{
ClipperPath_to_Slic3rMultiPoint(polynode.Childs[i]->Contour, expolygons[cnt].holes[i]);
//Add outer polygons contained by (nested within) holes ...
for (int j = 0; j < polynode.Childs[i]->ChildCount(); ++j)
AddOuterPolyNodeToExPolygons(*polynode.Childs[i]->Childs[j], expolygons);
}
}
void PolyTreeToExPolygons(ClipperLib::PolyTree& polytree, Slic3r::ExPolygons& expolygons)
{
expolygons.clear();
for (int i = 0; i < polytree.ChildCount(); ++i)
AddOuterPolyNodeToExPolygons(*polytree.Childs[i], expolygons);
}
//-----------------------------------------------------------
template <class T>
void
ClipperPath_to_Slic3rMultiPoint(const ClipperLib::Path &input, T &output)
{
output.points.clear();
for (ClipperLib::Path::const_iterator pit = input.begin(); pit != input.end(); ++pit) {
output.points.push_back(Slic3r::Point( (*pit).X, (*pit).Y ));
}
}
template <class T>
void
ClipperPaths_to_Slic3rMultiPoints(const ClipperLib::Paths &input, T &output)
{
output.clear();
for (ClipperLib::Paths::const_iterator it = input.begin(); it != input.end(); ++it) {
typename T::value_type p;
ClipperPath_to_Slic3rMultiPoint(*it, p);
output.push_back(p);
}
}
void
ClipperPaths_to_Slic3rExPolygons(const ClipperLib::Paths &input, Slic3r::ExPolygons &output)
{
// init Clipper
ClipperLib::Clipper clipper;
clipper.Clear();
// perform union
clipper.AddPaths(input, ClipperLib::ptSubject, true);
ClipperLib::PolyTree polytree;
clipper.Execute(ClipperLib::ctUnion, polytree, ClipperLib::pftEvenOdd, ClipperLib::pftEvenOdd); // offset results work with both EvenOdd and NonZero
// write to ExPolygons object
output.clear();
PolyTreeToExPolygons(polytree, output);
}
void
Slic3rMultiPoint_to_ClipperPath(const Slic3r::MultiPoint &input, ClipperLib::Path &output)
{
output.clear();
for (Slic3r::Points::const_iterator pit = input.points.begin(); pit != input.points.end(); ++pit) {
output.push_back(ClipperLib::IntPoint( (*pit).x, (*pit).y ));
}
}
template <class T>
void
Slic3rMultiPoints_to_ClipperPaths(const T &input, ClipperLib::Paths &output)
{
output.clear();
for (typename T::const_iterator it = input.begin(); it != input.end(); ++it) {
ClipperLib::Path p;
Slic3rMultiPoint_to_ClipperPath(*it, p);
output.push_back(p);
}
}
void
scaleClipperPolygons(ClipperLib::Paths &polygons, const double scale)
{
for (ClipperLib::Paths::iterator it = polygons.begin(); it != polygons.end(); ++it) {
for (ClipperLib::Path::iterator pit = (*it).begin(); pit != (*it).end(); ++pit) {
(*pit).X *= scale;
(*pit).Y *= scale;
}
}
}
void
offset(const Slic3r::Polygons &polygons, ClipperLib::Paths &retval, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// read input
ClipperLib::Paths input;
Slic3rMultiPoints_to_ClipperPaths(polygons, input);
// scale input
scaleClipperPolygons(input, scale);
// perform offset
ClipperLib::ClipperOffset co;
if (joinType == jtRound) {
co.ArcTolerance = miterLimit;
} else {
co.MiterLimit = miterLimit;
}
co.AddPaths(input, joinType, ClipperLib::etClosedPolygon);
co.Execute(retval, (delta*scale));
// unscale output
scaleClipperPolygons(retval, 1/scale);
}
void
offset(const Slic3r::Polygons &polygons, Slic3r::Polygons &retval, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// perform offset
ClipperLib::Paths output;
offset(polygons, output, delta, scale, joinType, miterLimit);
// convert into ExPolygons
ClipperPaths_to_Slic3rMultiPoints(output, retval);
}
void
offset(const Slic3r::Polylines &polylines, ClipperLib::Paths &retval, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// read input
ClipperLib::Paths input;
Slic3rMultiPoints_to_ClipperPaths(polylines, input);
// scale input
scaleClipperPolygons(input, scale);
// perform offset
ClipperLib::ClipperOffset co;
if (joinType == jtRound) {
co.ArcTolerance = miterLimit;
} else {
co.MiterLimit = miterLimit;
}
co.AddPaths(input, joinType, ClipperLib::etOpenButt);
co.Execute(retval, (delta*scale));
// unscale output
scaleClipperPolygons(retval, 1/scale);
}
void
offset(const Slic3r::Polylines &polylines, Slic3r::Polygons &retval, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// perform offset
ClipperLib::Paths output;
offset(polylines, output, delta, scale, joinType, miterLimit);
// convert into ExPolygons
ClipperPaths_to_Slic3rMultiPoints(output, retval);
}
void
offset(const Slic3r::Surface &surface, Slic3r::Surfaces &retval, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// perform offset
Slic3r::ExPolygons expp;
offset_ex(surface.expolygon, expp, delta, scale, joinType, miterLimit);
// clone the input surface for each expolygon we got
retval.clear();
retval.reserve(expp.size());
for (ExPolygons::iterator it = expp.begin(); it != expp.end(); ++it) {
Surface s = surface; // clone
s.expolygon = *it;
retval.push_back(s);
}
}
void
offset_ex(const Slic3r::Polygons &polygons, Slic3r::ExPolygons &retval, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// perform offset
ClipperLib::Paths output;
offset(polygons, output, delta, scale, joinType, miterLimit);
// convert into ExPolygons
ClipperPaths_to_Slic3rExPolygons(output, retval);
}
void
offset2(const Slic3r::Polygons &polygons, ClipperLib::Paths &retval, const float delta1,
const float delta2, const double scale, const ClipperLib::JoinType joinType, const double miterLimit)
{
// read input
ClipperLib::Paths input;
Slic3rMultiPoints_to_ClipperPaths(polygons, input);
// scale input
scaleClipperPolygons(input, scale);
// prepare ClipperOffset object
ClipperLib::ClipperOffset co;
if (joinType == jtRound) {
co.ArcTolerance = miterLimit;
} else {
co.MiterLimit = miterLimit;
}
// perform first offset
ClipperLib::Paths output1;
co.AddPaths(input, joinType, ClipperLib::etClosedPolygon);
co.Execute(output1, (delta1*scale));
// perform second offset
co.Clear();
co.AddPaths(output1, joinType, ClipperLib::etClosedPolygon);
co.Execute(retval, (delta2*scale));
// unscale output
scaleClipperPolygons(retval, 1/scale);
}
void
offset2(const Slic3r::Polygons &polygons, Slic3r::Polygons &retval, const float delta1,
const float delta2, const double scale, const ClipperLib::JoinType joinType, const double miterLimit)
{
// perform offset
ClipperLib::Paths output;
offset2(polygons, output, delta1, delta2, scale, joinType, miterLimit);
// convert into ExPolygons
ClipperPaths_to_Slic3rMultiPoints(output, retval);
}
void
offset2_ex(const Slic3r::Polygons &polygons, Slic3r::ExPolygons &retval, const float delta1,
const float delta2, const double scale, const ClipperLib::JoinType joinType, const double miterLimit)
{
// perform offset
ClipperLib::Paths output;
offset2(polygons, output, delta1, delta2, scale, joinType, miterLimit);
// convert into ExPolygons
ClipperPaths_to_Slic3rExPolygons(output, retval);
}
template <class T>
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, 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
clipper.AddPaths(input_subject, ClipperLib::ptSubject, true);
clipper.AddPaths(input_clip, ClipperLib::ptClip, true);
// perform operation
clipper.Execute(clipType, retval, fillType, fillType);
}
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_)
{
// 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
clipper.AddPaths(input_subject, ClipperLib::ptSubject, false);
clipper.AddPaths(input_clip, ClipperLib::ptClip, true);
// perform operation
clipper.Execute(clipType, retval, fillType, fillType);
}
void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polygons &subject,
const Slic3r::Polygons &clip, Slic3r::Polygons &retval, bool safety_offset_)
{
// perform operation
ClipperLib::Paths output;
_clipper_do<ClipperLib::Paths>(clipType, subject, clip, output, ClipperLib::pftNonZero, safety_offset_);
// convert into Polygons
ClipperPaths_to_Slic3rMultiPoints(output, retval);
}
void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polygons &subject,
const Slic3r::Polygons &clip, Slic3r::ExPolygons &retval, bool safety_offset_)
{
// perform operation
ClipperLib::PolyTree polytree;
_clipper_do<ClipperLib::PolyTree>(clipType, subject, clip, polytree, ClipperLib::pftNonZero, safety_offset_);
// convert into ExPolygons
PolyTreeToExPolygons(polytree, retval);
}
void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polylines &subject,
const Slic3r::Polygons &clip, Slic3r::Polylines &retval, bool safety_offset_)
{
// perform operation
ClipperLib::PolyTree polytree;
_clipper_do(clipType, subject, clip, polytree, ClipperLib::pftNonZero, safety_offset_);
// convert into Polylines
ClipperLib::Paths output;
ClipperLib::PolyTreeToPaths(polytree, output);
ClipperPaths_to_Slic3rMultiPoints(output, retval);
}
void _clipper(ClipperLib::ClipType clipType, const Slic3r::Polygons &subject,
const Slic3r::Polygons &clip, Slic3r::Polylines &retval, bool safety_offset_)
{
// transform input polygons into polylines
Slic3r::Polylines polylines;
polylines.reserve(subject.size());
for (Slic3r::Polygons::const_iterator polygon = subject.begin(); polygon != subject.end(); ++polygon)
polylines.push_back(*polygon); // implicit call to split_at_first_point()
/* Clipper will remove a polyline segment if first point coincides with last one.
Until that bug is not fixed upstream, we move one of those points slightly. */
for (Slic3r::Polylines::iterator polyline = polylines.begin(); polyline != polylines.end(); ++polyline)
polyline->points.front().translate(1, 0);
// perform clipping
_clipper(clipType, polylines, clip, retval, safety_offset_);
// compensate for the above hack
for (Slic3r::Polylines::iterator polyline = retval.begin(); polyline != retval.end(); ++polyline) {
for (Slic3r::Polylines::iterator subj_polyline = polylines.begin(); subj_polyline != polylines.end(); ++subj_polyline) {
// if first point of clipped line coincides with first point of subject line, compensate for hack
if (polyline->points.front().coincides_with(subj_polyline->points.front())) {
polyline->points.front().translate(-1, 0);
break;
}
// since Clipper does not preserve orientation of polylines, check last point too
if (polyline->points.back().coincides_with(subj_polyline->points.front())) {
polyline->points.back().translate(-1, 0);
break;
}
}
}
/* If the split_at_first_point() call above happens to split the polygon inside the clipping area
we would get two consecutive polylines instead of a single one, so we go through them in order
to recombine continuous polylines. */
for (size_t i = 0; i < retval.size(); ++i) {
for (size_t j = i+1; j < retval.size(); ++j) {
if (retval[i].points.back().coincides_with(retval[j].points.front())) {
/* If last point of i coincides with first point of j,
append points of j to i and delete j */
retval[i].points.insert(retval[i].points.end(), retval[j].points.begin()+1, retval[j].points.end());
retval.erase(retval.begin() + j);
--j;
} else if (retval[i].points.front().coincides_with(retval[j].points.back())) {
/* If first point of i coincides with last point of j,
prepend points of j to i and delete j */
retval[i].points.insert(retval[i].points.begin(), retval[j].points.begin(), retval[j].points.end()-1);
retval.erase(retval.begin() + j);
--j;
} else if (retval[i].points.front().coincides_with(retval[j].points.front())) {
/* Since Clipper does not preserve orientation of polylines,
also check the case when first point of i coincides with first point of j. */
retval[j].reverse();
retval[i].points.insert(retval[i].points.begin(), retval[j].points.begin(), retval[j].points.end()-1);
retval.erase(retval.begin() + j);
--j;
} else if (retval[i].points.back().coincides_with(retval[j].points.back())) {
/* Since Clipper does not preserve orientation of polylines,
also check the case when last point of i coincides with last point of j. */
retval[j].reverse();
retval[i].points.insert(retval[i].points.end(), retval[j].points.begin()+1, retval[j].points.end());
retval.erase(retval.begin() + j);
--j;
}
}
}
}
template <class SubjectType, class ResultType>
void diff(const SubjectType &subject, const Slic3r::Polygons &clip, ResultType &retval, bool safety_offset_)
{
_clipper(ClipperLib::ctDifference, subject, clip, retval, safety_offset_);
}
template void diff<Slic3r::Polygons, Slic3r::ExPolygons>(const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, Slic3r::ExPolygons &retval, bool safety_offset_);
template void diff<Slic3r::Polygons, Slic3r::Polygons>(const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, Slic3r::Polygons &retval, bool safety_offset_);
template void diff<Slic3r::Polygons, Slic3r::Polylines>(const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, Slic3r::Polylines &retval, bool safety_offset_);
template void diff<Slic3r::Polylines, Slic3r::Polylines>(const Slic3r::Polylines &subject, const Slic3r::Polygons &clip, Slic3r::Polylines &retval, bool safety_offset_);
template <class SubjectType, class ResultType>
void intersection(const SubjectType &subject, const Slic3r::Polygons &clip, ResultType &retval, bool safety_offset_)
{
_clipper(ClipperLib::ctIntersection, subject, clip, retval, safety_offset_);
}
template void intersection<Slic3r::Polygons, Slic3r::ExPolygons>(const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, Slic3r::ExPolygons &retval, bool safety_offset_);
template void intersection<Slic3r::Polygons, Slic3r::Polygons>(const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, Slic3r::Polygons &retval, bool safety_offset_);
template void intersection<Slic3r::Polygons, Slic3r::Polylines>(const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, Slic3r::Polylines &retval, bool safety_offset_);
template void intersection<Slic3r::Polylines, Slic3r::Polylines>(const Slic3r::Polylines &subject, const Slic3r::Polygons &clip, Slic3r::Polylines &retval, bool safety_offset_);
void xor_ex(const Slic3r::Polygons &subject, const Slic3r::Polygons &clip, Slic3r::ExPolygons &retval,
bool safety_offset_)
{
_clipper(ClipperLib::ctXor, subject, clip, retval, safety_offset_);
}
template <class T>
void union_(const Slic3r::Polygons &subject, T &retval, bool safety_offset_)
{
Slic3r::Polygons p;
_clipper(ClipperLib::ctUnion, subject, p, retval, safety_offset_);
}
template void union_<Slic3r::ExPolygons>(const Slic3r::Polygons &subject, Slic3r::ExPolygons &retval, bool safety_offset_);
template void union_<Slic3r::Polygons>(const Slic3r::Polygons &subject, Slic3r::Polygons &retval, bool safety_offset_);
void union_pt(const Slic3r::Polygons &subject, ClipperLib::PolyTree &retval, bool safety_offset_)
{
Slic3r::Polygons clip;
_clipper_do<ClipperLib::PolyTree>(ClipperLib::ctUnion, subject, clip, retval, ClipperLib::pftEvenOdd, safety_offset_);
}
void union_pt_chained(const Slic3r::Polygons &subject, Slic3r::Polygons &retval, bool safety_offset_)
{
ClipperLib::PolyTree pt;
union_pt(subject, pt, safety_offset_);
traverse_pt(pt.Childs, retval);
}
static void traverse_pt(ClipperLib::PolyNodes &nodes, Slic3r::Polygons &retval)
{
/* use a nearest neighbor search to order these children
TODO: supply start_near to chained_path() too? */
// collect ordering points
Points ordering_points;
ordering_points.reserve(nodes.size());
for (ClipperLib::PolyNodes::const_iterator it = nodes.begin(); it != nodes.end(); ++it) {
Point p((*it)->Contour.front().X, (*it)->Contour.front().Y);
ordering_points.push_back(p);
}
// perform the ordering
ClipperLib::PolyNodes ordered_nodes;
Slic3r::Geometry::chained_path_items(ordering_points, nodes, ordered_nodes);
// push results recursively
for (ClipperLib::PolyNodes::iterator it = ordered_nodes.begin(); it != ordered_nodes.end(); ++it) {
// traverse the next depth
traverse_pt((*it)->Childs, retval);
Polygon p;
ClipperPath_to_Slic3rMultiPoint((*it)->Contour, p);
retval.push_back(p);
if ((*it)->IsHole()) retval.back().reverse(); // ccw
}
}
void simplify_polygons(const Slic3r::Polygons &subject, Slic3r::Polygons &retval, bool preserve_collinear)
{
// convert into Clipper polygons
ClipperLib::Paths input_subject, output;
Slic3rMultiPoints_to_ClipperPaths(subject, input_subject);
if (preserve_collinear) {
ClipperLib::Clipper c;
c.PreserveCollinear(true);
c.StrictlySimple(true);
c.AddPaths(input_subject, ClipperLib::ptSubject, true);
c.Execute(ClipperLib::ctUnion, output, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
} else {
ClipperLib::SimplifyPolygons(input_subject, output, ClipperLib::pftNonZero);
}
// convert into Slic3r polygons
ClipperPaths_to_Slic3rMultiPoints(output, retval);
}
void simplify_polygons(const Slic3r::Polygons &subject, Slic3r::ExPolygons &retval, bool preserve_collinear)
{
if (!preserve_collinear) {
Polygons polygons;
simplify_polygons(subject, polygons, preserve_collinear);
union_(polygons, retval);
return;
}
// convert into Clipper polygons
ClipperLib::Paths input_subject;
Slic3rMultiPoints_to_ClipperPaths(subject, input_subject);
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
PolyTreeToExPolygons(polytree, retval);
}
void safety_offset(ClipperLib::Paths* paths)
{
// scale input
scaleClipperPolygons(*paths, CLIPPER_OFFSET_SCALE);
// perform offset (delta = scale 1e-05)
ClipperLib::ClipperOffset co;
co.MiterLimit = 2;
co.AddPaths(*paths, ClipperLib::jtMiter, ClipperLib::etClosedPolygon);
co.Execute(*paths, 10.0 * CLIPPER_OFFSET_SCALE);
// unscale output
scaleClipperPolygons(*paths, 1.0/CLIPPER_OFFSET_SCALE);
}
///////////////////////
#ifdef SLIC3RXS
SV*
polynode_children_2_perl(const ClipperLib::PolyNode& node)
{
AV* av = newAV();
const unsigned int len = node.ChildCount();
av_extend(av, len-1);
for (int i = 0; i < len; ++i) {
av_store(av, i, polynode2perl(*node.Childs[i]));
}
return (SV*)newRV_noinc((SV*)av);
}
SV*
polynode2perl(const ClipperLib::PolyNode& node)
{
HV* hv = newHV();
Slic3r::Polygon p;
ClipperPath_to_Slic3rMultiPoint(node.Contour, p);
if (node.IsHole()) {
(void)hv_stores( hv, "hole", Slic3r::perl_to_SV_clone_ref(p) );
} else {
(void)hv_stores( hv, "outer", Slic3r::perl_to_SV_clone_ref(p) );
}
(void)hv_stores( hv, "children", polynode_children_2_perl(node) );
return (SV*)newRV_noinc((SV*)hv);
}
#endif
}
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