Function plot_surface

include/matplotlibcpp.h:440–531

#ifndef WITHOUT_NUMPY
template <typename Numeric>
void plot_surface(const std::vector<::std::vector<Numeric>> &x,
                  const std::vector<::std::vector<Numeric>> &y,
                  const std::vector<::std::vector<Numeric>> &z,
                  const std::map<std::string, std::string> &keywords =
                      std::map<std::string, std::string>())
{
  detail::_interpreter::get();

  // We lazily load the modules here the first time this function is called
  // because I'm not sure that we can assume "matplotlib installed" implies
  // "mpl_toolkits installed" on all platforms, and we don't want to require
  // it for people who don't need 3d plots.
  static PyObject *mpl_toolkitsmod = nullptr, *axis3dmod = nullptr;
  if (!mpl_toolkitsmod) {
    detail::_interpreter::get();

    PyObject* mpl_toolkits = PyString_FromString("mpl_toolkits");
    PyObject* axis3d = PyString_FromString("mpl_toolkits.mplot3d");
    if (!mpl_toolkits || !axis3d) { throw std::runtime_error("couldnt create string"); }

    mpl_toolkitsmod = PyImport_Import(mpl_toolkits);
    Py_DECREF(mpl_toolkits);
    if (!mpl_toolkitsmod) { throw std::runtime_error("Error loading module mpl_toolkits!"); }

    axis3dmod = PyImport_Import(axis3d);
    Py_DECREF(axis3d);
    if (!axis3dmod) { throw std::runtime_error("Error loading module mpl_toolkits.mplot3d!"); }
  }

  assert(x.size() == y.size());
  assert(y.size() == z.size());

  // using numpy arrays
  PyObject *xarray = detail::get_2darray(x);
  PyObject *yarray = detail::get_2darray(y);
  PyObject *zarray = detail::get_2darray(z);

  // construct positional args
  PyObject *args = PyTuple_New(3);
  PyTuple_SetItem(args, 0, xarray);
  PyTuple_SetItem(args, 1, yarray);
  PyTuple_SetItem(args, 2, zarray);

  // Build up the kw args.
  PyObject *kwargs = PyDict_New();
  PyDict_SetItemString(kwargs, "rstride", PyInt_FromLong(1));
  PyDict_SetItemString(kwargs, "cstride", PyInt_FromLong(1));

  PyObject *python_colormap_coolwarm = PyObject_GetAttrString(
      detail::_interpreter::get().s_python_colormap, "coolwarm");

  PyDict_SetItemString(kwargs, "cmap", python_colormap_coolwarm);

  for (std::map<std::string, std::string>::const_iterator it = keywords.begin();
       it != keywords.end(); ++it) {
    PyDict_SetItemString(kwargs, it->first.c_str(),
                         PyString_FromString(it->second.c_str()));
  }