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Implemented utility functions to operate over lines, polylines, polygons,

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surfaces.
This commit is contained in:
bubnikv 2016-11-07 22:49:11 +01:00
parent aac968162b
commit 5a81731577
13 changed files with 495 additions and 66 deletions
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107
xs/src/libslic3r/ClipperUtils.cpp
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@ -314,6 +314,113 @@ Slic3r::Polygons offset(const Slic3r::ExPolygon &expolygon, const float delta,
return retval;
}
Slic3r::ExPolygons offset_ex(const Slic3r::ExPolygon &expolygon, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// perform offset
ClipperLib::Paths output;
offset(expolygon, &output, delta, scale, joinType, miterLimit);
// convert into ExPolygons
Slic3r::ExPolygons retval;
ClipperPaths_to_Slic3rExPolygons(output, &retval);
return retval;
}
// This is a safe variant of the polygon offset, tailored for a single ExPolygon:
// a single polygon with multiple non-overlapping holes.
// Each contour and hole is offsetted separately, then the holes are subtracted from the outer contours.
void offset(const Slic3r::ExPolygons &expolygons, ClipperLib::Paths* retval, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// printf("new ExPolygon offset\n");
const float delta_scaled = float(delta * scale);
ClipperLib::Paths contours;
ClipperLib::Paths holes;
contours.reserve(expolygons.size());
{
size_t n_holes = 0;
for (size_t i = 0; i < expolygons.size(); ++ i)
n_holes += expolygons[i].holes.size();
holes.reserve(n_holes);
}
for (Slic3r::ExPolygons::const_iterator it_expoly = expolygons.begin(); it_expoly != expolygons.end(); ++ it_expoly) {
// 1) Offset the outer contour.
{
ClipperLib::Path input;
Slic3rMultiPoint_to_ClipperPath(it_expoly->contour, &input);
scaleClipperPolygon(input, scale);
ClipperLib::ClipperOffset co;
if (joinType == jtRound)
co.ArcTolerance = miterLimit;
else
co.MiterLimit = miterLimit;
co.AddPath(input, joinType, ClipperLib::etClosedPolygon);
ClipperLib::Paths out;
co.Execute(out, delta_scaled);
contours.insert(contours.end(), out.begin(), out.end());
}
// 2) Offset the holes one by one, collect the results.
{
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, &input);
scaleClipperPolygon(input, scale);
ClipperLib::ClipperOffset co;
if (joinType == jtRound)
co.ArcTolerance = miterLimit;
else
co.MiterLimit = miterLimit;
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;
{
ClipperLib::Clipper clipper;
clipper.Clear();
clipper.AddPaths(contours, ClipperLib::ptSubject, true);
clipper.AddPaths(holes, ClipperLib::ptClip, true);
clipper.Execute(ClipperLib::ctDifference, *retval, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
}
// 4) Unscale the output.
scaleClipperPolygons(*retval, 1/scale);
}
Slic3r::Polygons offset(const Slic3r::ExPolygons &expolygons, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// perform offset
ClipperLib::Paths output;
offset(expolygons, &output, delta, scale, joinType, miterLimit);
// convert into ExPolygons
Slic3r::Polygons retval;
ClipperPaths_to_Slic3rMultiPoints(output, &retval);
return retval;
}
Slic3r::ExPolygons offset_ex(const Slic3r::ExPolygons &expolygons, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)
{
// perform offset
ClipperLib::Paths output;
offset(expolygons, &output, delta, scale, joinType, miterLimit);
// convert into ExPolygons
Slic3r::ExPolygons retval;
ClipperPaths_to_Slic3rExPolygons(output, &retval);
return retval;
}
Slic3r::ExPolygons
offset_ex(const Slic3r::Polygons &polygons, const float delta,
double scale, ClipperLib::JoinType joinType, double miterLimit)