8000 Merge pull request #1 from lava/master · sadads1337/matplotlib-cpp@9d185c6 · GitHub
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Merge pull request #1 from lava/master
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2 parents d687405 + 2843ebb commit 9d185c6

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‎.gitignore

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# Build
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/examples/build/*
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# vim temp files
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*.sw*

‎Makefile

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# Use C++11
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CXXFLAGS += -std=c++11
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# Use C++11, dont warn on long-to-float conversion
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CXXFLAGS += -std=c++11 -Wno-conversion
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# Default to using system's default version of python
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PYTHON_BIN ?= python
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PYTHON_CONFIG := $(PYTHON_BIN)-config
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PYTHON_INCLUDE ?= $(shell $(PYTHON_CONFIG) --includes)
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CXXFLAGS += $(PYTHON_INCLUDE)
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EXTRA_FLAGS := $(PYTHON_INCLUDE)
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LDFLAGS += $(shell $(PYTHON_CONFIG) --libs)
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# Either finds numpy or set -DWITHOUT_NUMPY
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CXXFLAGS += $(shell $(PYTHON_BIN) $(CURDIR)/numpy_flags.py)
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WITHOUT_NUMPY := $(findstring $(CXXFLAGS), WITHOUT_NUMPY)
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EXTRA_FLAGS += $(shell $(PYTHON_BIN) $(CURDIR)/numpy_flags.py)
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WITHOUT_NUMPY := $(findstring $(EXTRA_FLAGS), WITHOUT_NUMPY)
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# Examples requiring numpy support to compile
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EXAMPLES_NUMPY := surface
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EXAMPLES := minimal basic modern animation nonblock xkcd quiver bar fill_inbetween fill update subplot2grid \
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$(if WITHOUT_NUMPY,,$(EXAMPLES_NUMPY))
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EXAMPLES_NUMPY := surface colorbar
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EXAMPLES := minimal basic modern animation nonblock xkcd quiver bar \
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fill_inbetween fill update subplot2grid lines3d \
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$(if $(WITHOUT_NUMPY),,$(EXAMPLES_NUMPY))
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# Prefix every example with 'examples/build/'
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EXAMPLE_TARGETS := $(patsubst %,examples/build/%,$(EXAMPLES))
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examples: $(EXAMPLE_TARGETS)
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docs:
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doxygen
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moxygen doc/xml --noindex -o doc/api.md
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# Assume every *.cpp file is a separate example
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$(EXAMPLE_TARGETS): examples/build/%: examples/%.cpp
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$(EXAMPLE_TARGETS): examples/build/%: examples/%.cpp matplotlibcpp.h
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mkdir -p examples/build
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$(CXX) -o $@ $< $(CXXFLAGS) $(LDFLAGS)
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$(CXX) -o $@ $< $(EXTRA_FLAGS) $(CXXFLAGS) $(LDFLAGS)
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clean:
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rm -f ${EXAMPLE_TARGETS}

‎README.md

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If you prefer to use CMake as build system, you will want to add something like this to your
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CMakeLists.txt:
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**Recommended way (since CMake 3.12):**
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It's easy to use cmake official [docs](https://cmake.org/cmake/help/git-stage/module/FindPython2.html#module:FindPython2) to find Python 2(or 3) interpreter, compiler and development environment (include directories and libraries).
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NumPy is optional here, delete it from cmake script, if you don't need it.
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```cmake
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find_package(Python2 COMPONENTS Development NumPy)
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target_include_directories(myproject PRIVATE ${Python2_INCLUDE_DIRS} ${Python2_NumPy_INCLUDE_DIRS})
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target_link_libraries(myproject Python2::Python Python2::NumPy)
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```
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**Alternative way (for CMake <= 3.11):**
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```cmake
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find_package(PythonLibs 2.7)
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target_include_directories(myproject PRIVATE ${PYTHON_INCLUDE_DIRS})
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* If you use Anaconda on Windows, you might need to set PYTHONHOME to Anaconda home directory and QT_QPA_PLATFORM_PLUGIN_PATH to %PYTHONHOME%Library/plugins/platforms. The latter is for especially when you get the error which says 'This application failed to start because it could not find or load the Qt platform plugin "windows"
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in "".'
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* MacOS: `Unable to import matplotlib.pyplot`. Cause: In mac os image rendering back end of matplotlib (what-is-a-backend to render using the API of Cocoa by default). There is Qt4Agg and GTKAgg and as a back-end is not the default. Set the back end of macosx that is differ compare with other windows or linux os.
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Solution is discribed [here](https://stackoverflow.com/questions/21784641/installation-issue-with-matplotlib-python?noredirect=1&lq=1), additional information can be found there too(see links in answers).

‎examples/colorbar.cpp

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#define _USE_MATH_DEFINES
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#include <cmath>
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#include <iostream>
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#include "../matplotlibcpp.h"
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using namespace std;
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namespace plt = matplotlibcpp;
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int main()
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{
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// Prepare data
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int ncols = 500, nrows = 300;
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std::vector<float> z(ncols * nrows);
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for (int j=0; j<nrows; ++j) {
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for (int i=0; i<ncols; ++i) {
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z.at(ncols * j + i) = std::sin(std::hypot(i - ncols/2, j - nrows/2));
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}
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}
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const float* zptr = &(z[0]);
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const int colors = 1;
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plt::title("My matrix");
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PyObject* mat;
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plt::imshow(zptr, nrows, ncols, colors, {}, &mat);
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plt::colorbar(mat);
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// Show plots
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plt::show();
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plt::close();
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Py_DECREF(mat);
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}

‎examples/lines3d.cpp

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#include "../matplotlibcpp.h"
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#include <cmath>
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namespace plt = matplotlibcpp;
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int main()
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{
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std::vector<double> x, y, z;
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double theta, r;
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double z_inc = 4.0/99.0; double theta_inc = (8.0 * M_PI)/99.0;
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for (double i = 0; i < 100; i += 1) {
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theta = -4.0 * M_PI + theta_inc*i;
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z.push_back(-2.0 + z_inc*i);
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r = z[i]*z[i] + 1;
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x.push_back(r * sin(theta));
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y.push_back(r * cos(theta));
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}
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std::map<std::string, std::string> keywords;
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keywords.insert(std::pair<std::string, std::string>("label", "parametric curve") );
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plt::plot3(x, y, z, keywords);
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plt::xlabel("x label");
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plt::ylabel("y label");
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plt::set_zlabel("z label"); // set_zlabel rather than just zlabel, in accordance with the Axes3D method
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plt::legend();
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plt::show();
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}

‎examples/lines3d.png

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