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added plot_scatter #113

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added plot_scatter #113

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95 changes: 95 additions & 0 deletions matplotlibcpp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -500,6 +500,101 @@ void plot_surface(const std::vector<::std::vector<Numeric>> &x,
if (res) Py_DECREF(res);
}

template <typename Numeric>
void plot_scatter(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;
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Is this PR ready? There seems to be a lot of dead code.

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sorry, forgot to delete irrelevant code taken from another example. I used this plot_scatter function in my code and it's working correctly...

//std::string> &keywords = std::map<std::string, std::string>()

// 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 = get_2darray(x);
PyObject *yarray = get_2darray(y);
PyObject *zarray = 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()));
}
*/

PyObject *fig =
PyObject_CallObject(detail::_interpreter::get().s_python_function_figure,
detail::_interpreter::get().s_python_empty_tuple);
if (!fig) throw std::runtime_error("Call to figure() failed.");

PyObject *gca_kwargs = PyDict_New();
PyDict_SetItemString(gca_kwargs, "projection", PyString_FromString("3d"));

PyObject *gca = PyObject_GetAttrString(fig, "gca");
if (!gca) throw std::runtime_error("No gca");
Py_INCREF(gca);
PyObject *axis = PyObject_Call(
gca, detail::_interpreter::get().s_python_empty_tuple, gca_kwargs);

if (!axis) throw std::runtime_error("No axis");
Py_INCREF(axis);

Py_DECREF(gca);
Py_DECREF(gca_kwargs);

PyObject *scatter = PyObject_GetAttrString(axis, "scatter");
if (!scatter) throw std::runtime_error("No scatter");

Py_INCREF(scatter);
PyObject *res = PyObject_Call(scatter, args, kwargs);
if (!res) throw std::runtime_error("failed scatter");
Py_DECREF(scatter);

Py_DECREF(axis);
Py_DECREF(args);
Py_DECREF(kwargs);
if (res) Py_DECREF(res);
}

template<typename Numeric>
bool stem(const std::vector<Numeric> &x, const std::vector<Numeric> &y, const std::map<std::string, std::string>& keywords)
{
Expand Down