本文整理汇总了C++中clipperlib::Paths::empty方法的典型用法代码示例。如果您正苦于以下问题：C++ Paths::empty方法的具体用法？C++ Paths::empty怎么用？C++ Paths::empty使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类clipperlib::Paths的用法示例。
在下文中一共展示了Paths::empty方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: _offset
// 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.
ClipperLib::Paths _offset(const Slic3r::ExPolygon &expolygon, const float delta,
ClipperLib::JoinType joinType, double miterLimit)
{
// printf("new ExPolygon offset\n");
// 1) Offset the outer contour.
const float delta_scaled = delta * float(CLIPPER_OFFSET_SCALE);
ClipperLib::Paths contours;
{
ClipperLib::Path input = Slic3rMultiPoint_to_ClipperPath(expolygon.contour);
scaleClipperPolygon(input);
ClipperLib::ClipperOffset co;
if (joinType == jtRound)
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
else
co.MiterLimit = miterLimit;
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
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) {
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;
co.ShortestEdgeLength = double(std::abs(delta_scaled * CLIPPER_OFFSET_SHORTEST_EDGE_FACTOR));
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;
if (holes.empty()) {
output = std::move(contours);
} else {
ClipperLib::Clipper clipper;
clipper.Clear();
clipper.AddPaths(contours, ClipperLib::ptSubject, true);
clipper.AddPaths(holes, ClipperLib::ptClip, true);
clipper.Execute(ClipperLib::ctDifference, output, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
}
// 4) Unscale the output.
unscaleClipperPolygons(output);
return output;
}示例2: safety_offset
void safety_offset(ClipperLib::Paths* paths)
{
PROFILE_FUNC();
// scale input
scaleClipperPolygons(*paths);
// perform offset (delta = scale 1e-05)
ClipperLib::ClipperOffset co;
#ifdef CLIPPER_UTILS_DEBUG
if (clipper_export_enabled) {
static int iRun = 0;
export_clipper_input_polygons_bin(debug_out_path("safety_offset-polygons-%d", ++iRun).c_str(), *paths, ClipperLib::Paths());
}
#endif /* CLIPPER_UTILS_DEBUG */
ClipperLib::Paths out;
for (size_t i = 0; i < paths->size(); ++ i) {
ClipperLib::Path &path = (*paths)[i];
co.Clear();
co.MiterLimit = 2;
bool ccw = ClipperLib::Orientation(path);
if (! ccw)
std::reverse(path.begin(), path.end());
{
PROFILE_BLOCK(safety_offset_AddPaths);
co.AddPath((*paths)[i], ClipperLib::jtMiter, ClipperLib::etClosedPolygon);
}
{
PROFILE_BLOCK(safety_offset_Execute);
// offset outside by 10um
ClipperLib::Paths out_this;
co.Execute(out_this, ccw ? 10.f * float(CLIPPER_OFFSET_SCALE) : -10.f * float(CLIPPER_OFFSET_SCALE));
if (! ccw) {
// Reverse the resulting contours once again.
for (ClipperLib::Paths::iterator it = out_this.begin(); it != out_this.end(); ++ it)
std::reverse(it->begin(), it->end());
}
if (out.empty())
out = std::move(out_this);
else
std::move(std::begin(out_this), std::end(out_this), std::back_inserter(out));
}
}
*paths = std::move(out);
// unscale output
unscaleClipperPolygons(*paths);
}