Add kwargs for text and annotate

Author: kfish

matplotlibcpp.h

@@ -316,7 +316,8 @@ struct _interpreter {
 // must be called before the first regular call to matplotlib to have any effect
 inline void backend(const std::string &name) { detail::s_backend = name; }
 
-inline bool annotate(std::string annotation, double x, double y) {
+inline bool annotate(std::string annotation, double x, double y,
+                     const std::map<std::string, std::string> &keywords = {}) {
   detail::_interpreter::get();
 
   PyObject *xy = PyTuple_New(2);
@@ -328,6 +329,11 @@ inline bool annotate(std::string annotation, double x, double y) {
   PyObject *kwargs = PyDict_New();
   PyDict_SetItemString(kwargs, "xy", xy);
 
+  for (auto const &item : keywords) {
+    PyDict_SetItemString(kwargs, item.first.c_str(),
+                         PyString_FromString(item.second.c_str()));
+  }
+
   PyObject *args = PyTuple_New(1);
   PyTuple_SetItem(args, 0, str);
 
@@ -1300,16 +1306,23 @@ bool stem(const std::vector<Numeric> &y, const std::string &format = "") {
 }
 
 template <typename Numeric>
-void text(Numeric x, Numeric y, const std::string &s = "") {
+void text(Numeric x, Numeric y, const std::string &s = "",
+          const std::map<std::string, std::string> &keywords = {}) {
   detail::_interpreter::get();
 
   PyObject *args = PyTuple_New(3);
   PyTuple_SetItem(args, 0, PyFloat_FromDouble(x));
   PyTuple_SetItem(args, 1, PyFloat_FromDouble(y));
   PyTuple_SetItem(args, 2, PyString_FromString(s.c_str()));
 
-  PyObject *res = PyObject_CallObject(
-      detail::_interpreter::get().s_python_function_text, args);
+  PyObject *kwargs = PyDict_New();
+  for (auto const &item : keywords) {
+    PyDict_SetItemString(kwargs, item.first.c_str(),
+                         PyString_FromString(item.second.c_str()));
+  }
+
+  PyObject *res = PyObject_Call(
+      detail::_interpreter::get().s_python_function_text, args, kwargs);
   if (!res)
     throw std::runtime_error("Call to text() failed.");