Add the full source of BambuStudio

using version 1.0.10

tests/fff_print/test_extrusion_entity.cpp

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+#include <catch2/catch.hpp>
+
+#include <cstdlib>
+
+#include "libslic3r/ExtrusionEntityCollection.hpp"
+#include "libslic3r/ExtrusionEntity.hpp"
+#include "libslic3r/Point.hpp"
+#include "libslic3r/libslic3r.h"
+
+#include "test_data.hpp"
+
+using namespace Slic3r;
+
+static inline Slic3r::Point random_point(float LO=-50, float HI=50) 
+{
+    Vec2f pt = Vec2f(LO, LO) + (Vec2d(rand(), rand()) * (HI-LO) / RAND_MAX).cast<float>();
+	return pt.cast<coord_t>();
+}
+
+// build a sample extrusion entity collection with random start and end points.
+static Slic3r::ExtrusionPath random_path(size_t length = 20, float LO = -50, float HI = 50)
+{
+    ExtrusionPath t {erPerimeter, 1.0, 1.0, 1.0};
+    for (size_t j = 0; j < length; ++ j)
+        t.polyline.append(random_point(LO, HI));
+    return t;
+}
+
+static Slic3r::ExtrusionPaths random_paths(size_t count = 10, size_t length = 20, float LO = -50, float HI = 50)
+{
+    Slic3r::ExtrusionPaths p;
+    for (size_t i = 0; i < count; ++ i)
+        p.push_back(random_path(length, LO, HI));
+    return p;
+}
+
+SCENARIO("ExtrusionEntityCollection: Polygon flattening", "[ExtrusionEntity]") {
+    srand(0xDEADBEEF); // consistent seed for test reproducibility.
+
+    // Generate one specific random path set and save it for later comparison
+    Slic3r::ExtrusionPaths nosort_path_set = random_paths();
+
+    Slic3r::ExtrusionEntityCollection sub_nosort;
+    sub_nosort.append(nosort_path_set);
+    sub_nosort.no_sort = true;
+
+    Slic3r::ExtrusionEntityCollection sub_sort;
+    sub_sort.no_sort = false;
+    sub_sort.append(random_paths());
+
+    GIVEN("A Extrusion Entity Collection with a child that has one child that is marked as no-sort") {
+        Slic3r::ExtrusionEntityCollection sample;
+        Slic3r::ExtrusionEntityCollection output;
+
+        sample.append(sub_sort);
+        sample.append(sub_nosort);
+        sample.append(sub_sort);
+
+        WHEN("The EEC is flattened with default options (preserve_order=false)") {
+			output = sample.flatten();
+            THEN("The output EEC contains no Extrusion Entity Collections") {
+                CHECK(std::count_if(output.entities.cbegin(), output.entities.cend(), [=](const ExtrusionEntity* e) {return e->is_collection();}) == 0);
+            }
+        }
+        WHEN("The EEC is flattened with preservation (preserve_order=true)") {
+			output = sample.flatten(true);
+            THEN("The output EECs contains one EEC.") {
+                CHECK(std::count_if(output.entities.cbegin(), output.entities.cend(), [=](const ExtrusionEntity* e) {return e->is_collection();}) == 1);
+            }
+            AND_THEN("The ordered EEC contains the same order of elements than the original") {
+                // find the entity in the collection
+                for (auto e : output.entities)
+                    if (e->is_collection()) {
+                        ExtrusionEntityCollection *temp = dynamic_cast<ExtrusionEntityCollection*>(e);
+                        // check each Extrusion path against nosort_path_set to see if the first and last match the same
+                        CHECK(nosort_path_set.size() == temp->entities.size());
+                        for (size_t i = 0; i < nosort_path_set.size(); ++ i) {
+                            CHECK(temp->entities[i]->first_point() == nosort_path_set[i].first_point());
+                            CHECK(temp->entities[i]->last_point() == nosort_path_set[i].last_point());
+                        }
+                    }
+            }
+        }
+    }
+}