10BC0 Support for stem and xkcd (#43) · JW1992/matplotlib-cpp@fb4cdf9 · GitHub
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Support for stem and xkcd (lava#43)
* Add support for stem and xkcd * Add README for xkcd
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‎README.md‎

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@@ -93,6 +93,36 @@ int main()
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Result: ![Modern example](./examples/modern.png)
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Or some *funny-looking xkcd-styled* example:
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```cpp
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#include "matplotlibcpp.h"
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#include <vector>
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#include <cmath>
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namespace plt = matplotlibcpp;
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int main() {
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std::vector<double> t(1000);
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std::vector<double> x(t.size());
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for(size_t i = 0; i < t.size(); i++) {
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t[i] = i / 100.0;
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x[i] = sin(2.0 * M_PI * 1.0 * t[i]);
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}
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plt::xkcd();
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plt::plot(t, x);
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plt::title("AN ORDINARY SIN WAVE");
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plt::save("xkcd.png");
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}
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```
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g++ xkcd.cpp -std=c++11 -I/usr/include/python2.7 -lpython2.7
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**Result:**
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![Minimal example](./examples/xkcd.png)
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Installation
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------------
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‎examples/xkcd.cpp‎

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#include "../matplotlibcpp.h"
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#include <vector>
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#include <cmath>
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namespace plt = matplotlibcpp;
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int main() {
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std::vector<double> t(1000);
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std::vector<double> x(t.size());
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for(size_t i = 0; i < t.size(); i++) {
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t[i] = i / 100.0;
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x[i] = sin(2.0 * M_PI * 1.0 * t[i]);
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}
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plt::xkcd();
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plt::plot(t, x);
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plt::title("AN ORDINARY SIN WAVE");
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plt::save("xkcd.png");
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}
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‎examples/xkcd.png‎

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‎matplotlibcpp.h‎

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@@ -55,6 +55,8 @@ namespace matplotlibcpp {
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PyObject *s_python_function_annotate;
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PyObject *s_python_function_tight_layout;
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PyObject *s_python_empty_tuple;
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PyObject *s_python_function_stem;
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PyObject *s_python_function_xkcd;
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/* For now, _interpreter is implemented as a singleton since its currently not possible to have
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multiple independent embedded python interpreters without patching the python source code
@@ -133,6 +135,8 @@ namespace matplotlibcpp {
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s_python_function_clf = PyObject_GetAttrString(pymod, "clf");
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s_python_function_errorbar = PyObject_GetAttrString(pymod, "errorbar");
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s_python_function_tight_layout = PyObject_GetAttrString(pymod, "tight_layout");
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s_python_function_stem = PyObject_GetAttrString(pymod, "stem");
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s_python_function_xkcd = PyObject_GetAttrString(pymod, "xkcd");
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if( !s_python_function_show
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|| !s_python_function_draw
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|| !s_python_function_errorbar
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|| !s_python_function_errorbar
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|| !s_python_function_tight_layout
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|| !s_python_function_stem
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|| !s_python_function_xkcd
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) { throw std::runtime_error("Couldn't find required function!"); }
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if ( !PyFunction_Check(s_python_function_show)
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|| !PyFunction_Check(s_python_function_clf)
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|| !PyFunction_Check(s_python_function_tight_layout)
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|| !PyFunction_Check(s_python_function_errorbar)
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|| !PyFunction_Check(s_python_function_stem)
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|| !PyFunction_Check(s_python_function_xkcd)
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) { throw std::runtime_error("Python object is unexpectedly not a PyFunction."); }
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s_python_empty_tuple = PyTuple_New(0);
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return res;
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}
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template<typename Numeric>
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bool stem(const std::vector<Numeric> &x, const std::vector<Numeric> &y, const std::map<std::string, std::string>& keywords)
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{
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assert(x.size() == y.size());
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// using numpy arrays
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PyObject* xarray = get_array(x);
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PyObject* yarray = get_array(y);
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// construct positional args
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PyObject* args = PyTuple_New(2);
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PyTuple_SetItem(args, 0, xarray);
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PyTuple_SetItem(args, 1, yarray);
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// construct keyword args
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PyObject* kwargs = PyDict_New();
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for (std::map<std::string, std::string>::const_iterator it =
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keywords.begin(); it != keywords.end(); ++it) {
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PyDict_SetItemString(kwargs, it->first.c_str(),
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PyString_FromString(it->second.c_str()));
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}
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PyObject* res = PyObject_Call(
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detail::_interpreter::get().s_python_function_stem, args, kwargs);
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Py_DECREF(args);
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Py_DECREF(kwargs);
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if (res)
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Py_DECREF(res);
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return res;
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}
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template< typename Numeric >
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bool fill_between(const std::vector<Numeric>& x, const std::vector<Numeric>& y1, const std::vector<Numeric>& y2, const std::map<std::string, std::string>& keywords)
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{
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return res;
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}
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template<typename NumericX, typename NumericY>
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bool stem(const std::vector<NumericX>& x, const std::vector<NumericY>& y, const std::string& s = "")
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{
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assert(x.size() == y.size());
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PyObject* xarray = get_array(x);
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PyObject* yarray = get_array(y);
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PyObject* pystring = PyString_FromString(s.c_str());
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PyObject* plot_args = PyTuple_New(3);
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PyTuple_SetItem(plot_args, 0, xarray);
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PyTuple_SetItem(plot_args, 1, yarray);
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PyTuple_SetItem(plot_args, 2, pystring);
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PyObject* res = PyObject_CallObject(
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detail::_interpreter::get().s_python_function_stem, plot_args);
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Py_DECREF(plot_args);
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if (res)
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Py_DECREF(res);
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return res;
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}
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template<typename NumericX, typename NumericY>
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bool semilogx(const std::vector<NumericX>& x, const std::vector<NumericY>& y, const std::string& s = "")
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{
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return plot(x,y,format);
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}
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template<typename Numeric>
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bool stem(const std::vector<Numeric>& y, const std::string& format = "")
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{
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std::vector<Numeric> x(y.size());
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for (size_t i = 0; i < x.size(); ++i) x.at(i) = i;
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return stem(x, y, format);
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}
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inline void figure()
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{
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PyObject* res = PyObject_CallObject(detail::_interpreter::get().s_python_function_figure, detail::_interpreter::get().s_python_empty_tuple);
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Py_DECREF(res);
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}
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inline void xkcd() {
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PyObject* res;
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PyObject *kwargs = PyDict_New();
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res = PyObject_Call(detail::_interpreter::get().s_python_function_xkcd,
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detail::_interpreter::get().s_python_empty_tuple, kwargs);
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if (!res)
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throw std::runtime_error("Call to show() failed.");
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Py_DECREF(res);
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}
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inline void draw()
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{
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PyObject* res = PyObject_CallObject(
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return plot<double>(x,y,keywords);
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}
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bool stem(const std::vector<double>& x, const std::vector<double>& y, const std::string& format = "")
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{
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return stem<double, double>(x, y, format);
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}
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bool stem(const std::vector<double>& y, const std::string& format = "")
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{
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return stem<double>(y, format);
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}
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bool stem(const std::vector<double>& x, const std::vector<double>& y, const std::map<std::string, std::string>& keywords)
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{
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return stem<double>(x, y, keywords);
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}
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bool named_plot(const std::string& name, const std::vector<double>& x, const std::vector<double>& y, const std::string& format = "") {
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return named_plot<double>(name,x,y,format);
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}

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