Prototype feature: fill plater with instances of selected object

#fixes #1350

src/slic3r/GUI/Jobs/FillBedJob.cpp

@@ -0,0 +1,139 @@
+#include "FillBedJob.hpp"
+
+#include "libslic3r/Model.hpp"
+#include "libslic3r/ClipperUtils.hpp"
+
+#include "slic3r/GUI/Plater.hpp"
+#include "slic3r/GUI/GLCanvas3D.hpp"
+#include "slic3r/GUI/GUI_ObjectList.hpp"
+
+#include <numeric>
+
+namespace Slic3r {
+namespace GUI {
+
+void FillBedJob::prepare()
+{
+    m_selected.clear();
+    m_unselected.clear();
+    m_bedpts.clear();
+
+    m_object_idx = m_plater->get_selected_object_idx();
+    if (m_object_idx == -1)
+        return;
+
+    ModelObject *model_object = m_plater->model().objects[m_object_idx];
+    if (model_object->instances.empty()) return;
+
+    m_selected.reserve(model_object->instances.size());
+    for (ModelInstance *inst : model_object->instances)
+        if (inst->printable) {
+            ArrangePolygon ap = get_arrange_poly(inst, m_plater);
+            ++ap.priority; // need to be included in the result
+            m_selected.emplace_back(ap);
+        }
+
+    if (m_selected.empty()) return;
+
+    m_bedpts = get_bed_shape(*m_plater->config());
+
+    auto &objects = m_plater->model().objects;
+    for (size_t idx = 0; idx < objects.size(); ++idx)
+        if (int(idx) != m_object_idx)
+            for (const ModelInstance *mi : objects[idx]->instances) {
+                m_unselected.emplace_back(mi->get_arrange_polygon());
+                m_unselected.back().bed_idx = 0;
+            }
+
+    if (auto wt = get_wipe_tower_arrangepoly(*m_plater))
+        m_unselected.emplace_back(std::move(*wt));
+
+    double sc = scaled<double>(1.) * scaled(1.);
+
+    ExPolygon poly = m_selected.front().poly;
+    double poly_area = poly.area() / sc;
+    double unsel_area = std::accumulate(m_unselected.begin(),
+                                        m_unselected.end(), 0.,
+                                        [](double s, const auto &ap) {
+                                            return s + ap.poly.area();
+                                        }) / sc;
+
+    double fixed_area = unsel_area + m_selected.size() * poly_area;
+
+    // This is the maximum range, the real number will always be close but less.
+    double bed_area = Polygon{m_bedpts}.area() / sc;
+
+    m_status_range = (bed_area - fixed_area) / poly_area;
+
+    ModelInstance *mi = model_object->instances[0];
+    for (int i = 0; i < m_status_range; ++i) {
+        ArrangePolygon ap;
+        ap.poly = m_selected.front().poly;
+        ap.bed_idx = arrangement::UNARRANGED;
+        ap.setter = [this, mi](const ArrangePolygon &p) {
+            ModelObject *mo = m_plater->model().objects[m_object_idx];
+            ModelInstance *inst = mo->add_instance(*mi);
+            inst->apply_arrange_result(p.translation.cast<double>(), p.rotation);
+        };
+        m_selected.emplace_back(ap);
+    }
+}
+
+void FillBedJob::process()
+{
+    if (m_object_idx == -1 || m_selected.empty()) return;
+
+    GLCanvas3D::ArrangeSettings settings =
+        m_plater->canvas3D()->get_arrange_settings();
+
+    arrangement::ArrangeParams params;
+    params.min_obj_distance = scaled(settings.distance);
+    params.allow_rotations  = settings.enable_rotation;
+
+    params.stopcondition = [this]() { return was_canceled(); };
+
+    params.progressind = [this](unsigned st) {
+        if (st > 0)
+            update_status(int(m_status_range - st), _(L("Filling bed")));
+    };
+
+    arrangement::arrange(m_selected, m_unselected, m_bedpts, params);
+
+    // finalize just here.
+    update_status(m_status_range, was_canceled() ?
+                                      _(L("Bed filling canceled.")) :
+                                      _(L("Bed filling done.")));
+}
+
+void FillBedJob::finalize()
+{
+    if (m_object_idx == -1) return;
+
+    ModelObject *model_object = m_plater->model().objects[m_object_idx];
+    if (model_object->instances.empty()) return;
+
+    size_t inst_cnt = model_object->instances.size();
+
+    for (ArrangePolygon &ap : m_selected) {
+        if (ap.priority != 0 || !(ap.bed_idx == arrangement::UNARRANGED || ap.bed_idx > 0))
+            ap.apply();
+    }
+
+    model_object->ensure_on_bed();
+
+    m_plater->update();
+
+    int added_cnt = std::accumulate(m_selected.begin(), m_selected.end(), 0,
+                                     [](int s, auto &ap) {
+                                         return s + int(ap.priority == 0 && ap.bed_idx == 0);
+                                     });
+
+    // FIXME: somebody explain why this is needed for increase_object_instances
+    if (inst_cnt == 1) added_cnt++;
+
+    if (added_cnt > 0)
+        m_plater->sidebar()
+            .obj_list()->increase_object_instances(m_object_idx, size_t(added_cnt));
+}
+
+}} // namespace Slic3r::GUI