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WallToolPaths.cpp
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// Copyright (c) 2023 UltiMaker
// CuraEngine is released under the terms of the AGPLv3 or higher
#include "WallToolPaths.h"
#include <algorithm> //For std::partition_copy and std::min_element.
#include <unordered_set>
#include <range/v3/range/conversion.hpp>
#include <range/v3/view/filter.hpp>
#include <range/v3/view/transform.hpp>
#include <scripta/logger.h>
#include "BeadingStrategy/BeadingStrategyFactory.h"
#include "ExtruderTrain.h"
#include "arachne/SkeletalTrapezoidation.h"
#include "utils/ExtrusionLineStitcher.h"
#include "utils/Simplify.h"
#include "utils/actions/smooth.h"
#include "utils/polygonUtils.h"
namespace cura
{
WallToolPaths::WallToolPaths(
const Shape& outline,
const coord_t nominal_bead_width,
const size_t inset_count,
const coord_t wall_0_inset,
const Settings& settings,
const int layer_idx,
SectionType section_type)
: outline_(outline)
, bead_width_0_(nominal_bead_width)
, bead_width_x_(nominal_bead_width)
, inset_count_(inset_count)
, wall_0_inset_(wall_0_inset)
, print_thin_walls_(settings.get<bool>("fill_outline_gaps"))
, min_feature_size_(nominal_bead_width / 4)
, min_bead_width_(std::min(min_even_wall_line_width_, min_odd_wall_line_width_))
, wall_transition_angle_(AngleDegrees(10))
, wall_transition_length_(nominal_bead_width)
, min_even_wall_line_width_(std::llrint(nominal_bead_width * 0.85))
, wall_line_width_0_(nominal_bead_width)
, min_odd_wall_line_width_(min_even_wall_line_width_)
, wall_line_width_x_(nominal_bead_width)
, wall_distribution_count_(1)
, wall_transition_filter_distance_(MM2INT(100))
, wall_transition_filter_deviation_(nominal_bead_width / 4)
, stitch_distance_(nominal_bead_width - 1)
, toolpaths_generated_(false)
, settings_(settings)
, layer_idx_(layer_idx)
, section_type_(section_type)
{
}
WallToolPaths::WallToolPaths(
const Shape& outline,
const coord_t bead_width_0,
const coord_t bead_width_x,
const size_t inset_count,
const coord_t wall_0_inset,
const Settings& settings,
const int layer_idx,
SectionType section_type)
: outline_(outline)
, bead_width_0_(bead_width_0)
, bead_width_x_(bead_width_x)
, inset_count_(inset_count)
, wall_0_inset_(wall_0_inset)
, print_thin_walls_(settings.get<bool>("fill_outline_gaps"))
, min_feature_size_(settings.get<coord_t>("min_feature_size"))
, min_bead_width_(settings.get<coord_t>("min_bead_width"))
, wall_transition_angle_(settings.get<AngleRadians>("wall_transition_angle"))
, wall_transition_length_(settings.get<coord_t>("wall_transition_length"))
, min_even_wall_line_width_(settings.get<double>("min_even_wall_line_width"))
, wall_line_width_0_(settings.get<double>("wall_line_width_0"))
, min_odd_wall_line_width_(settings.get<double>("min_odd_wall_line_width"))
, wall_line_width_x_(settings.get<double>("wall_line_width_x"))
, wall_distribution_count_(settings.get<int>("wall_distribution_count"))
, wall_transition_filter_distance_(settings.get<coord_t>("wall_transition_filter_distance"))
, wall_transition_filter_deviation_(settings.get<coord_t>("wall_transition_filter_deviation"))
, stitch_distance_(settings.get<coord_t>("wall_line_width_x") - 1) // In 0-width contours, junctions can cause up to 1-line-width gaps. Don't stitch more than 1 line width.
, toolpaths_generated_(false)
, settings_(settings)
, layer_idx_(layer_idx)
, section_type_(section_type)
{
}
const std::vector<VariableWidthLines>& WallToolPaths::generate()
{
MendedShape prepared_outline(&settings_, section_type_, &outline_);
if (prepared_outline.getShape().area() <= 0)
{
assert(toolpaths_.empty());
return toolpaths_;
}
constexpr coord_t discretization_step_size = MM2INT(0.8);
// When to split the middle wall into two:
const Ratio wall_split_middle_threshold = std::max(1.0, std::min(99.0, 100.0 * (2.0 * min_even_wall_line_width_ - wall_line_width_0_) / wall_line_width_0_)) / 100.0;
// When to add a new middle in between the innermost two walls:
const Ratio wall_add_middle_threshold = std::max(1.0, std::min(99.0, 100.0 * min_odd_wall_line_width_ / wall_line_width_x_)) / 100.0;
const size_t max_bead_count = (inset_count_ < std::numeric_limits<size_t>::max() / 2) ? 2 * inset_count_ : std::numeric_limits<size_t>::max();
const auto beading_strat = BeadingStrategyFactory::makeStrategy(
bead_width_0_,
bead_width_x_,
wall_transition_length_,
wall_transition_angle_,
print_thin_walls_,
min_bead_width_,
min_feature_size_,
wall_split_middle_threshold,
wall_add_middle_threshold,
max_bead_count,
wall_0_inset_,
wall_distribution_count_);
SkeletalTrapezoidation wall_maker(
prepared_outline,
*beading_strat,
beading_strat->getTransitioningAngle(),
discretization_step_size,
wall_transition_filter_distance_,
wall_transition_filter_deviation_,
wall_transition_length_,
layer_idx_,
section_type_);
wall_maker.generateToolpaths(toolpaths_);
scripta::log(
"toolpaths_0",
toolpaths_,
section_type_,
layer_idx_,
scripta::CellVDI{ "is_closed", &ExtrusionLine::is_closed_ },
scripta::CellVDI{ "is_odd", &ExtrusionLine::is_odd_ },
scripta::CellVDI{ "inset_idx", &ExtrusionLine::inset_idx_ },
scripta::PointVDI{ "width", &ExtrusionJunction::w_ },
scripta::PointVDI{ "perimeter_index", &ExtrusionJunction::perimeter_index_ });
stitchToolPaths(toolpaths_, stitch_distance_);
scripta::log(
"toolpaths_1",
toolpaths_,
section_type_,
layer_idx_,
scripta::CellVDI{ "is_closed", &ExtrusionLine::is_closed_ },
scripta::CellVDI{ "is_odd", &ExtrusionLine::is_odd_ },
scripta::CellVDI{ "inset_idx", &ExtrusionLine::inset_idx_ },
scripta::PointVDI{ "width", &ExtrusionJunction::w_ },
scripta::PointVDI{ "perimeter_index", &ExtrusionJunction::perimeter_index_ });
removeSmallFillLines(toolpaths_);
scripta::log(
"toolpaths_2",
toolpaths_,
section_type_,
layer_idx_,
scripta::CellVDI{ "is_closed", &ExtrusionLine::is_closed_ },
scripta::CellVDI{ "is_odd", &ExtrusionLine::is_odd_ },
scripta::CellVDI{ "inset_idx", &ExtrusionLine::inset_idx_ },
scripta::PointVDI{ "width", &ExtrusionJunction::w_ },
scripta::PointVDI{ "perimeter_index", &ExtrusionJunction::perimeter_index_ });
simplifyToolPaths(toolpaths_, settings_);
scripta::log(
"toolpaths_3",
toolpaths_,
section_type_,
layer_idx_,
scripta::CellVDI{ "is_closed", &ExtrusionLine::is_closed_ },
scripta::CellVDI{ "is_odd", &ExtrusionLine::is_odd_ },
scripta::CellVDI{ "inset_idx", &ExtrusionLine::inset_idx_ },
scripta::PointVDI{ "width", &ExtrusionJunction::w_ },
scripta::PointVDI{ "perimeter_index", &ExtrusionJunction::perimeter_index_ });
separateOutInnerContour();
removeEmptyToolPaths(toolpaths_);
scripta::log(
"toolpaths_4",
toolpaths_,
section_type_,
layer_idx_,
scripta::CellVDI{ "is_closed", &ExtrusionLine::is_closed_ },
scripta::CellVDI{ "is_odd", &ExtrusionLine::is_odd_ },
scripta::CellVDI{ "inset_idx", &ExtrusionLine::inset_idx_ },
scripta::PointVDI{ "width", &ExtrusionJunction::w_ },
scripta::PointVDI{ "perimeter_index", &ExtrusionJunction::perimeter_index_ });
assert(
std::is_sorted(
toolpaths_.cbegin(),
toolpaths_.cend(),
[](const VariableWidthLines& l, const VariableWidthLines& r)
{
return l.front().inset_idx_ < r.front().inset_idx_;
})
&& "WallToolPaths should be sorted from the outer 0th to inner_walls");
toolpaths_generated_ = true;
scripta::log(
"toolpaths_5",
toolpaths_,
section_type_,
layer_idx_,
scripta::CellVDI{ "is_closed", &ExtrusionLine::is_closed_ },
scripta::CellVDI{ "is_odd", &ExtrusionLine::is_odd_ },
scripta::CellVDI{ "inset_idx", &ExtrusionLine::inset_idx_ },
scripta::PointVDI{ "width", &ExtrusionJunction::w_ },
scripta::PointVDI{ "perimeter_index", &ExtrusionJunction::perimeter_index_ });
return toolpaths_;
}
void WallToolPaths::stitchToolPaths(std::vector<VariableWidthLines>& toolpaths, const coord_t stitch_distance)
{
for (unsigned int wall_idx = 0; wall_idx < toolpaths.size(); wall_idx++)
{
VariableWidthLines& wall_lines = toolpaths[wall_idx];
VariableWidthLines stitched_polylines;
VariableWidthLines closed_polygons;
ExtrusionLineStitcher::stitch(wall_lines, stitched_polylines, closed_polygons, stitch_distance);
wall_lines = stitched_polylines; // replace input toolpaths with stitched polylines
for (ExtrusionLine& wall_polygon : closed_polygons)
{
if (wall_polygon.junctions_.empty())
{
continue;
}
wall_polygon.is_closed_ = true;
wall_lines.emplace_back(std::move(wall_polygon)); // add stitched polygons to result
}
#ifdef DEBUG
for (ExtrusionLine& line : wall_lines)
{
assert(line.inset_idx_ == wall_idx);
}
#endif // DEBUG
}
}
void WallToolPaths::removeSmallFillLines(std::vector<VariableWidthLines>& toolpaths)
{
for (VariableWidthLines& inset : toolpaths)
{
for (size_t line_idx = 0; line_idx < inset.size(); line_idx++)
{
ExtrusionLine& line = inset[line_idx];
if (line.is_outer_wall())
{
continue;
}
coord_t min_width = std::numeric_limits<coord_t>::max();
for (const ExtrusionJunction& j : line)
{
min_width = std::min(min_width, j.w_);
}
if (line.is_odd_ && ! line.is_closed_ && line.shorterThan(min_width / 2))
{ // remove line
line = std::move(inset.back());
inset.erase(--inset.end());
line_idx--; // reconsider the current position
}
}
}
}
void WallToolPaths::simplifyToolPaths(std::vector<VariableWidthLines>& toolpaths, const Settings& settings)
{
const Simplify simplifier(settings);
for (auto& toolpath : toolpaths)
{
toolpath = toolpath
| ranges::views::transform(
[&simplifier](auto& line)
{
auto line_ = line.is_closed_ ? simplifier.polygon(line) : simplifier.polyline(line);
if (line_.is_closed_ && line_.size() >= 2 && line_.front() != line_.back())
{
line_.emplace_back(line_.front());
}
return line_;
})
| ranges::views::filter(
[](const auto& line)
{
return ! line.empty();
})
| ranges::to_vector;
}
}
const std::vector<VariableWidthLines>& WallToolPaths::getToolPaths()
{
if (! toolpaths_generated_)
{
return generate();
}
return toolpaths_;
}
void WallToolPaths::pushToolPaths(std::vector<VariableWidthLines>& paths)
{
if (! toolpaths_generated_)
{
generate();
}
paths.insert(paths.end(), toolpaths_.begin(), toolpaths_.end());
}
void WallToolPaths::separateOutInnerContour()
{
// We'll remove all 0-width paths from the original toolpaths and store them separately as polygons.
std::vector<VariableWidthLines> actual_toolpaths;
actual_toolpaths.reserve(toolpaths_.size()); // A bit too much, but the correct order of magnitude.
std::vector<VariableWidthLines> contour_paths;
contour_paths.reserve(toolpaths_.size() / inset_count_);
inner_contour_.clear();
for (const VariableWidthLines& inset : toolpaths_)
{
if (inset.empty())
{
continue;
}
bool is_contour = false;
for (const ExtrusionLine& line : inset)
{
for (const ExtrusionJunction& j : line)
{
if (j.w_ == 0)
{
is_contour = true;
}
else
{
is_contour = false;
}
break;
}
}
if (is_contour)
{
#ifdef DEBUG
for (const ExtrusionLine& line : inset)
{
for (const ExtrusionJunction& j : line)
{
assert(j.w_ == 0);
}
}
#endif // DEBUG
for (const ExtrusionLine& line : inset)
{
if (line.is_odd_)
{
continue; // odd lines don't contribute to the contour
}
else if (line.is_closed_) // sometimes an very small even polygonal wall is not stitched into a polygon
{
inner_contour_.emplace_back(line.toPolygon());
}
}
}
else
{
actual_toolpaths.emplace_back(inset);
}
}
if (! actual_toolpaths.empty())
{
toolpaths_ = std::move(actual_toolpaths); // Filtered out the 0-width paths.
}
else
{
toolpaths_.clear();
}
// The output walls from the skeletal trapezoidation have no known winding order, especially if they are joined together from polylines.
// They can be in any direction, clockwise or counter-clockwise, regardless of whether the shapes are positive or negative.
// To get a correct shape, we need to make the outside contour positive and any holes inside negative.
// This can be done by applying the even-odd rule to the shape. This rule is not sensitive to the winding order of the polygon.
// The even-odd rule would be incorrect if the polygon self-intersects, but that should never be generated by the skeletal trapezoidation.
inner_contour_ = inner_contour_.processEvenOdd();
}
const Shape& WallToolPaths::getInnerContour()
{
if (! toolpaths_generated_ && inset_count_ > 0)
{
generate();
}
else if (inset_count_ == 0)
{
return outline_;
}
return inner_contour_;
}
bool WallToolPaths::removeEmptyToolPaths(std::vector<VariableWidthLines>& toolpaths)
{
for (VariableWidthLines& toolpath : toolpaths)
{
toolpath.erase(
std::remove_if(
toolpath.begin(),
toolpath.end(),
[](const ExtrusionLine& line)
{
return line.junctions_.empty();
}),
toolpath.end());
}
toolpaths.erase(
std::remove_if(
toolpaths.begin(),
toolpaths.end(),
[](const VariableWidthLines& lines)
{
return lines.empty();
}),
toolpaths.end());
return toolpaths.empty();
}
} // namespace cura