migrated .cpp in shapes_and_collections

CMakeLists.txt

@@ -28,7 +28,7 @@ if(${ADD_DEMO})
   # add_subdirectory(gallery/subplots_axes_and_figures)
   # add_subdirectory(gallery/statistics)
   add_subdirectory(gallery/images_contours_and_fields)
-  # add_subdirectory(gallery/shapes_and_collections)
+  add_subdirectory(gallery/shapes_and_collections)
   add_subdirectory(gallery/artist_animation)
 endif()
 

gallery/shapes_and_collections/patch_collection.cpp

@@ -59,13 +59,13 @@ int main() {
   py::list colors = py::cast(colors_);
   auto p =
       collections::PatchCollection(args_(patches), kwargs_("alpha"_a = 0.4));
-  p.set_array(colors);
-  ax.add_collection(p.unwrap());
-  fig.colorbar(p.unwrap(), "ax"_a = ax.unwrap());
+  p.set_array(args_(colors));
+  ax.add_collection(args_(p.unwrap()));
+  fig.colorbar(args_(p.unwrap()), kwargs_("ax"_a = ax.unwrap()));
 #if USE_GUI
   plt.show();
 #else
-  plt.savefig("patch_collection.png");
+  plt.savefig(args_("patch_collection.png"));
 #endif
   return 0;
 }

gallery/shapes_and_collections/patches_circle_rectangle.cpp

@@ -26,14 +26,14 @@ int main() {
                    kwargs_("fc"_a = "b", "ec"_a = "y"));
   auto r = Rectangle(args_(py::make_tuple(0, 0), 0.25, 0.5),
                      kwargs_("ec"_a = "#000000", "fill"_a = false));
-  ax.add_patch(c.unwrap());
-  ax.add_patch(e.unwrap());
-  ax.add_patch(r.unwrap());
-  plt.axis("scaled");
-  ax.set_aspect("equal");
+  ax.add_patch(args_(c.unwrap()));
+  ax.add_patch(args_(e.unwrap()));
+  ax.add_patch(args_(r.unwrap()));
+  plt.axis(args_("scaled"));
+  ax.set_aspect(args_("equal"));
 #if USE_GUI
   plt.show();
 #else
-  plt.savefig("patches_circle_rectangle.png");
+  plt.savefig(args_("patches_circle_rectangle.png"));
 #endif
 }

include/matplotlibcpp17/pyplot.h

@@ -19,7 +19,7 @@ public:
     load_attrs();
   }
   // axes
-  axes::Axes axes(const pybind11::dict &kwargs);
+  axes::Axes axes(const pybind11::dict &kwargs = pybind11::dict());
 
   // axis
   pybind11::object axis(const pybind11::tuple &args = pybind11::tuple(),