237 lines
10 KiB
C++
237 lines
10 KiB
C++
#include "VariableWidth.hpp"
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namespace Slic3r {
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ExtrusionMultiPath thick_polyline_to_multi_path(const ThickPolyline& thick_polyline, ExtrusionRole role, const Flow& flow, const float tolerance, const float merge_tolerance, int overhang)
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{
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ExtrusionMultiPath multi_path;
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ExtrusionPath path(role);
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ThickLines lines = thick_polyline.thicklines();
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for (int i = 0; i < (int)lines.size(); ++i) {
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const ThickLine& line = lines[i];
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assert(line.a_width >= SCALED_EPSILON && line.b_width >= SCALED_EPSILON);
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const coordf_t line_len = line.length();
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if (line_len < SCALED_EPSILON) {
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// The line is so tiny that we don't care about its width when we connect it to another line.
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if (!path.empty())
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path.polyline.points.back() = line.b; // If the variable path is non-empty, connect this tiny line to it.
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else if (i + 1 < (int)lines.size()) // If there is at least one following line, connect this tiny line to it.
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lines[i + 1].a = line.a;
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else if (!multi_path.paths.empty())
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multi_path.paths.back().polyline.points.back() = line.b; // Connect this tiny line to the last finished path.
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// If any of the above isn't satisfied, then remove this tiny line.
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continue;
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}
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double thickness_delta = fabs(line.a_width - line.b_width);
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if (thickness_delta > tolerance) {
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const auto segments = (unsigned int)ceil(thickness_delta / tolerance);
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const coordf_t seg_len = line_len / segments;
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Points pp;
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std::vector<coordf_t> width;
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{
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pp.push_back(line.a);
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width.push_back(line.a_width);
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for (size_t j = 1; j < segments; ++j) {
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pp.push_back((line.a.cast<double>() + (line.b - line.a).cast<double>().normalized() * (j * seg_len)).cast<coord_t>());
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coordf_t w = line.a_width + (j*seg_len) * (line.b_width-line.a_width) / line_len;
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width.push_back(w);
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width.push_back(w);
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}
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pp.push_back(line.b);
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width.push_back(line.b_width);
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assert(pp.size() == segments + 1u);
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assert(width.size() == segments*2);
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}
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// delete this line and insert new ones
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lines.erase(lines.begin() + i);
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for (size_t j = 0; j < segments; ++j) {
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ThickLine new_line(pp[j], pp[j+1]);
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new_line.a_width = width[2*j];
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new_line.b_width = width[2*j+1];
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lines.insert(lines.begin() + i + j, new_line);
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}
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-- i;
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continue;
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}
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const double w = fmax(line.a_width, line.b_width);
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const Flow new_flow = (role == erOverhangPerimeter && flow.bridge()) ? flow : flow.with_width(unscale<float>(w) + flow.height() * float(1. - 0.25 * PI));
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if (path.polyline.points.empty()) {
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path.polyline.append(line.a);
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path.polyline.append(line.b);
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// Convert from spacing to extrusion width based on the extrusion model
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// of a square extrusion ended with semi circles.
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#ifdef SLIC3R_DEBUG
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printf(" filling %f gap\n", flow.width);
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#endif
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path.mm3_per_mm = new_flow.mm3_per_mm();
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path.width = new_flow.width();
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path.height = new_flow.height();
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} else {
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assert(path.width >= EPSILON);
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thickness_delta = scaled<double>(fabs(path.width - new_flow.width()));
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if (thickness_delta <= merge_tolerance) {
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// the width difference between this line and the current flow
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// (of the previous line) width is within the accepted tolerance
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path.polyline.append(line.b);
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} else {
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// we need to initialize a new line
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multi_path.paths.emplace_back(std::move(path));
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path = ExtrusionPath(role);
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-- i;
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}
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}
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}
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if( path.polyline.is_valid() ) {
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path.overhang_degree = overhang;
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multi_path.paths.emplace_back(std::move(path));
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}
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return multi_path;
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}
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//BBS: new function to filter width to avoid too fragmented segments
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//BBS：新功能过滤宽度，避免片段过于碎片化
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static ExtrusionPaths thick_polyline_to_extrusion_paths_2(const ThickPolyline& thick_polyline, ExtrusionRole role, const Flow& flow, const float tolerance)
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{
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ExtrusionPaths paths;
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ExtrusionPath path(role);
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ThickLines lines = thick_polyline.thicklines();
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size_t start_index = 0;
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double max_width, min_width;
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for (int i = 0; i < (int)lines.size(); ++i) {
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const ThickLine& line = lines[i];
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if (i == 0) {
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max_width = line.a_width;
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min_width = line.a_width;
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}
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const coordf_t line_len = line.length();
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if (line_len < SCALED_EPSILON) continue;
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double thickness_delta = std::max(fabs(max_width - line.b_width), fabs(min_width - line.b_width));
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//BBS: has large difference in width
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if (thickness_delta > tolerance) {
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//BBS: 1 generate path from start_index to i(not included)
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if (start_index != i){
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path = ExtrusionPath(role);
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double length = 0, sum = 0;
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for (int idx = start_index; idx < i; idx++) {
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length += lines[idx].length();
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sum += lines[idx].length() * 0.5 * (lines[idx].a_width + lines[idx].b_width);
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path.polyline.append(lines[idx].a);
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}
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path.polyline.append(lines[i].a);
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if (length > SCALED_EPSILON) {
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double w = sum / length;
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Flow new_flow = flow.with_width(unscale<float>(w) + flow.height() * float(1. - 0.25 * PI));
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path.mm3_per_mm = new_flow.mm3_per_mm();
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path.width = new_flow.width();
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path.height = new_flow.height();
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paths.emplace_back(std::move(path));
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}
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}
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start_index = i;
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max_width = line.a_width;
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min_width = line.a_width;
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//BBS: 2 handle the i-th segment
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thickness_delta = fabs(line.a_width - line.b_width);
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if (thickness_delta > tolerance){
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const unsigned int segments = (unsigned int)ceil(thickness_delta / tolerance);
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const coordf_t seg_len = line_len / segments;
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Points pp;
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std::vector<coordf_t> width;
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{
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pp.push_back(line.a);
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width.push_back(line.a_width);
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for (size_t j = 1; j < segments; ++j) {
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pp.push_back((line.a.cast<double>() + (line.b - line.a).cast<double>().normalized() * (j * seg_len)).cast<coord_t>());
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coordf_t w = line.a_width + (j * seg_len) * (line.b_width - line.a_width) / line_len;
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width.push_back(w);
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width.push_back(w);
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}
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pp.push_back(line.b);
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width.push_back(line.b_width);
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assert(pp.size() == segments + 1u);
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assert(width.size() == segments * 2);
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}
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// delete this line and insert new ones
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lines.erase(lines.begin() + i);
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for (size_t j = 0; j < segments; ++j) {
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ThickLine new_line(pp[j], pp[j + 1]);
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new_line.a_width = width[2 * j];
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new_line.b_width = width[2 * j + 1];
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lines.insert(lines.begin() + i + j, new_line);
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}
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--i;
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continue;
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}
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}
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//BBS: just update the max and min width and continue
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else {
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max_width = std::max(max_width, std::max(line.a_width, line.b_width));
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min_width = std::min(min_width, std::min(line.a_width, line.b_width));
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}
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}
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//BBS: handle the remaining segment
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size_t final_size = lines.size();
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if (start_index < final_size) {
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path = ExtrusionPath(role);
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double length = 0, sum = 0;
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for (int idx = start_index; idx < final_size; idx++) {
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length += lines[idx].length();
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sum += lines[idx].length() * (lines[idx].a_width + lines[idx].b_width) * 0.5;
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path.polyline.append(lines[idx].a);
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}
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path.polyline.append(lines[final_size - 1].b);
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if (length > SCALED_EPSILON) {
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double w = sum / length;
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Flow new_flow = flow.with_width(unscale<float>(w) + flow.height() * float(1. - 0.25 * PI));
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path.mm3_per_mm = new_flow.mm3_per_mm();
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path.width = new_flow.width();
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path.height = new_flow.height();
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paths.emplace_back(std::move(path));
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}
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}
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return paths;
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}
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void variable_width(const ThickPolylines& polylines, ExtrusionRole role, const Flow& flow, std::vector<ExtrusionEntity*>& out)
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{
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// This value determines granularity of adaptive width, as G-code does not allow
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// variable extrusion within a single move; this value shall only affect the amount
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// of segments, and any pruning shall be performed before we apply this tolerance.
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//该值决定了自适应宽度的粒度，因为G代码不允许在一次移动中进行可变拉伸；该值仅影响分段数量，在应用此公差之前，应进行任何修剪。
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const float tolerance = float(scale_(0.05));
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for (const ThickPolyline& p : polylines) {
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ExtrusionPaths paths = thick_polyline_to_extrusion_paths_2(p, role, flow, tolerance);
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// Append paths to collection.
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if (!paths.empty()) {
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if (paths.front().first_point() == paths.back().last_point())
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out.emplace_back(new ExtrusionLoop(std::move(paths)));
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else {
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for (ExtrusionPath& path : paths)
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out.emplace_back(new ExtrusionPath(std::move(path)));
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}
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}
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}
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}
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}
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