Merge prusa 2.6.1

src/libslic3r/Arrange/Core/Beds.hpp

@@ -0,0 +1,192 @@
+
+#ifndef BEDS_HPP
+#define BEDS_HPP
+
+#include <numeric>
+
+#include <libslic3r/Point.hpp>
+#include <libslic3r/ExPolygon.hpp>
+#include <libslic3r/BoundingBox.hpp>
+#include <libslic3r/ClipperUtils.hpp>
+
+#include <boost/variant.hpp>
+
+namespace Slic3r { namespace arr2 {
+
+// Bed types to be used with arrangement. Most generic bed is a simple polygon
+// with holes, but other special bed types are also valid, like a bed without
+// boundaries, or a special case of a rectangular or circular bed which leaves
+// a lot of room for optimizations.
+
+// Representing an unbounded bed.
+struct InfiniteBed {
+    Point center;
+    explicit InfiniteBed(const Point &p = {0, 0}): center{p} {}
+};
+
+BoundingBox bounding_box(const InfiniteBed &bed);
+
+inline InfiniteBed offset(const InfiniteBed &bed, coord_t) { return bed; }
+
+struct RectangleBed {
+    BoundingBox bb;
+
+    explicit RectangleBed(const BoundingBox &bedbb) : bb{bedbb} {}
+    explicit RectangleBed(coord_t w, coord_t h, Point c = {0, 0}):
+        bb{{c.x() - w / 2, c.y() - h / 2}, {c.x() + w / 2, c.y() + h / 2}}
+    {}
+
+    coord_t width() const { return bb.size().x(); }
+    coord_t height() const { return bb.size().y(); }
+};
+
+inline BoundingBox bounding_box(const RectangleBed &bed) { return bed.bb; }
+inline RectangleBed offset(RectangleBed bed, coord_t v)
+{
+    bed.bb.offset(v);
+    return bed;
+}
+
+Polygon to_rectangle(const BoundingBox &bb);
+
+inline Polygon to_rectangle(const RectangleBed &bed)
+{
+    return to_rectangle(bed.bb);
+}
+
+class CircleBed {
+    Point  m_center;
+    double m_radius;
+
+public:
+    CircleBed(): m_center(0, 0), m_radius(NaNd) {}
+    explicit CircleBed(const Point& c, double r)
+        : m_center(c)
+        , m_radius(r)
+    {}
+
+    double radius() const { return m_radius; }
+    const Point& center() const { return m_center; }
+};
+
+// Function to approximate a circle with a convex polygon
+Polygon approximate_circle_with_polygon(const CircleBed &bed, int nedges = 24);
+
+inline BoundingBox bounding_box(const CircleBed &bed)
+{
+    auto r = static_cast<coord_t>(std::round(bed.radius()));
+    Point R{r, r};
+
+    return {bed.center() - R, bed.center() + R};
+}
+inline CircleBed offset(const CircleBed &bed, coord_t v)
+{
+    return CircleBed{bed.center(), bed.radius() + v};
+}
+
+struct IrregularBed { ExPolygons poly; };
+inline BoundingBox bounding_box(const IrregularBed &bed)
+{
+    return get_extents(bed.poly);
+}
+
+inline IrregularBed offset(IrregularBed bed, coord_t v)
+{
+    bed.poly = offset_ex(bed.poly, v);
+    return bed;
+}
+
+using ArrangeBed =
+    boost::variant<InfiniteBed, RectangleBed, CircleBed, IrregularBed>;
+
+inline BoundingBox bounding_box(const ArrangeBed &bed)
+{
+    BoundingBox ret;
+    auto visitor = [&ret](const auto &b) { ret = bounding_box(b); };
+    boost::apply_visitor(visitor, bed);
+
+    return ret;
+}
+
+inline ArrangeBed offset(ArrangeBed bed, coord_t v)
+{
+    auto visitor = [v](auto &b) { b = offset(b, v); };
+    boost::apply_visitor(visitor, bed);
+
+    return bed;
+}
+
+inline double area(const BoundingBox &bb)
+{
+    auto bbsz = bb.size();
+    return double(bbsz.x()) * bbsz.y();
+}
+
+inline double area(const RectangleBed &bed)
+{
+    auto bbsz = bed.bb.size();
+    return double(bbsz.x()) * bbsz.y();
+}
+
+inline double area(const InfiniteBed &bed)
+{
+    return std::numeric_limits<double>::infinity();
+}
+
+inline double area(const IrregularBed &bed)
+{
+    return std::accumulate(bed.poly.begin(), bed.poly.end(), 0.,
+                           [](double s, auto &p) { return s + p.area(); });
+}
+
+inline double area(const CircleBed &bed)
+{
+    return bed.radius() * bed.radius() * PI;
+}
+
+inline double area(const ArrangeBed &bed)
+{
+    double ret = 0.;
+    auto visitor = [&ret](auto &b) { ret = area(b); };
+    boost::apply_visitor(visitor, bed);
+
+    return ret;
+}
+
+inline ExPolygons to_expolygons(const InfiniteBed &bed)
+{
+    return {ExPolygon{to_rectangle(RectangleBed{scaled(1000.), scaled(1000.)})}};
+}
+
+inline ExPolygons to_expolygons(const RectangleBed &bed)
+{
+    return {ExPolygon{to_rectangle(bed)}};
+}
+
+inline ExPolygons to_expolygons(const CircleBed &bed)
+{
+    return {ExPolygon{approximate_circle_with_polygon(bed)}};
+}
+
+inline ExPolygons to_expolygons(const IrregularBed &bed) { return bed.poly; }
+
+inline ExPolygons to_expolygons(const ArrangeBed &bed)
+{
+    ExPolygons ret;
+    auto visitor = [&ret](const auto &b) { ret = to_expolygons(b); };
+    boost::apply_visitor(visitor, bed);
+
+    return ret;
+}
+
+ArrangeBed to_arrange_bed(const Points &bedpts);
+
+} // namespace arr2
+
+inline BoundingBox &bounding_box(BoundingBox &bb) { return bb; }
+inline const BoundingBox &bounding_box(const BoundingBox &bb) { return bb; }
+inline BoundingBox bounding_box(const Polygon &p) { return get_extents(p); }
+
+} // namespace Slic3r
+
+#endif // BEDS_HPP