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Reworked Traveling Salesman Problem code for simplicity and robustness.

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The TSP algorithm is newly used for planning of the printing order
of objects AND their instances.
This commit is contained in:
bubnikv
2019-09-26 16:39:50 +02:00
parent 8d4dd294b2
commit 10eecb2cab
8 changed files with 293 additions and 316 deletions
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16
src/libslic3r/Print.cpp
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@@ -7,6 +7,7 @@
#include "Flow.hpp"
#include "Geometry.hpp"
#include "I18N.hpp"
#include "ShortestPath.hpp"
#include "SupportMaterial.hpp"
#include "GCode.hpp"
#include "GCode/WipeTower.hpp"
@@ -1824,8 +1825,8 @@ void Print::_make_brim()
[](const std::pair<const ClipperLib_Z::Path*, size_t> &l, const std::pair<const ClipperLib_Z::Path*, size_t> &r) {
return l.second < r.second;
});
Vec3f last_pt(0.f, 0.f, 0.f);
Point last_pt(0, 0);
for (size_t i = 0; i < loops_trimmed_order.size();) {
// Find all pieces that the initial loop was split into.
size_t j = i + 1;
@@ -1841,16 +1842,23 @@ void Print::_make_brim()
points.emplace_back(coord_t(pt.X), coord_t(pt.Y));
i = j;
} else {
//FIXME this is not optimal as the G-code generator will follow the sequence of paths verbatim without respect to minimum travel distance.
//FIXME The path chaining here may not be optimal.
ExtrusionEntityCollection this_loop_trimmed;
this_loop_trimmed.entities.reserve(j - i);
for (; i < j; ++ i) {
m_brim.entities.emplace_back(new ExtrusionPath(erSkirt, float(flow.mm3_per_mm()), float(flow.width), float(this->skirt_first_layer_height())));
this_loop_trimmed.entities.emplace_back(new ExtrusionPath(erSkirt, float(flow.mm3_per_mm()), float(flow.width), float(this->skirt_first_layer_height())));
const ClipperLib_Z::Path &path = *loops_trimmed_order[i].first;
Points &points = static_cast<ExtrusionPath*>(m_brim.entities.back())->polyline.points;
Points &points = static_cast<ExtrusionPath*>(this_loop_trimmed.entities.back())->polyline.points;
points.reserve(path.size());
for (const ClipperLib_Z::IntPoint &pt : path)
points.emplace_back(coord_t(pt.X), coord_t(pt.Y));
}
chain_and_reorder_extrusion_entities(this_loop_trimmed.entities, &last_pt);
m_brim.entities.reserve(m_brim.entities.size() + this_loop_trimmed.entities.size());
append(m_brim.entities, std::move(this_loop_trimmed.entities));
this_loop_trimmed.entities.clear();
}
last_pt = m_brim.last_point();
}
}
} else {