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, ClipperLib::Paths* retval, const float delta1,
const float delta2, const ClipperLib::JoinType joinType, const double miterLimit)
{
if (delta1 * delta2 >= 0) {
// Both deltas are the same signum
offset(polygons, retval, delta1 + delta2, joinType, miterLimit);
return;
}
#ifdef CLIPPER_UTILS_DEBUG
BoundingBox bbox = get_extents(polygons);
coordf_t stroke_width = scale_(0.005);
static int iRun = 0;
++ iRun;
bool flipY = false;
SVG svg(debug_out_path("offset2-%d.svg", iRun), bbox, scale_(1.), flipY);
for (Slic3r::Polygons::const_iterator it = polygons.begin(); it != polygons.end(); ++ it)
svg.draw(it->lines(), "gray", stroke_width);
#endif /* CLIPPER_UTILS_DEBUG */
// read input
ClipperLib::Paths input;
Slic3rMultiPoints_to_ClipperPaths(polygons, &input);
// scale input
scaleClipperPolygons(input);
// prepare ClipperOffset object
ClipperLib::ClipperOffset co;
if (joinType == jtRound) {
co.ArcTolerance = miterLimit * double(CLIPPER_OFFSET_SCALE);
} else {
co.MiterLimit = miterLimit;
}
// perform first offset
ClipperLib::Paths output1;
co.AddPaths(input, joinType, ClipperLib::etClosedPolygon);
co.Execute(output1, delta1 * float(CLIPPER_OFFSET_SCALE));
#ifdef CLIPPER_UTILS_DEBUG
svg.draw(output1, 1. / double(CLIPPER_OFFSET_SCALE), "red", stroke_width);
#endif /* CLIPPER_UTILS_DEBUG */
// perform second offset
co.Clear();
co.AddPaths(output1, joinType, ClipperLib::etClosedPolygon);
co.Execute(*retval, delta2 * float(CLIPPER_OFFSET_SCALE));
#ifdef CLIPPER_UTILS_DEBUG
svg.draw(*retval, 1. / double(CLIPPER_OFFSET_SCALE), "green", stroke_width);
#endif /* CLIPPER_UTILS_DEBUG */
// unscale output
unscaleClipperPolygons(*retval);
}
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);
}
ClipperLib::Paths
_offset2(const Polygons &polygons, const float delta1, const float delta2,
const ClipperLib::JoinType joinType, const double miterLimit)
{
// read input
ClipperLib::Paths input = Slic3rMultiPoints_to_ClipperPaths(polygons);
// scale input
scaleClipperPolygons(input);
// prepare ClipperOffset object
ClipperLib::ClipperOffset co;
if (joinType == jtRound) {
co.ArcTolerance = miterLimit;
} else {
co.MiterLimit = miterLimit;
}
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);
// perform first offset
ClipperLib::Paths output1;
co.AddPaths(input, joinType, ClipperLib::etClosedPolygon);
co.Execute(output1, delta_scaled1);
// perform second offset
co.Clear();
co.AddPaths(output1, joinType, ClipperLib::etClosedPolygon);
ClipperLib::Paths retval;
co.Execute(retval, delta_scaled2);
// unscale output
unscaleClipperPolygons(retval);
return retval;
}