Add modern cmake support

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.8 FATAL_ERROR)
+project(matplotlib_cpp LANGUAGES CXX)
+
+include(GNUInstallDirs)
+set(PACKAGE_NAME matplotlib_cpp)
+set(INSTALL_CONFIGDIR ${CMAKE_INSTALL_LIBDIR}/${PACKAGE_NAME}/cmake)
+
+
+# Library target
+add_library(matplotlib_cpp INTERFACE)
+target_include_directories(matplotlib_cpp
+  INTERFACE
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/examples>
+    $<INSTALL_INTERFACE:include>
+)
+target_compile_features(matplotlib_cpp INTERFACE
+  cxx_std_11
+)
+find_package(Python3 COMPONENTS Interpreter Development REQUIRED)
+target_link_libraries(matplotlib_cpp INTERFACE
+  Python3::Python
+  Python3::Module
+)
+find_package(Python3 COMPONENTS NumPy)
+if(Python3_NumPy_FOUND)
+  target_link_libraries(matplotlib_cpp INTERFACE
+    Python3::NumPy
+  )
+else()
+  target_compile_definitions(matplotlib_cpp INTERFACE WITHOUT_NUMPY)
+endif()
+install(
+  TARGETS matplotlib_cpp
+  EXPORT install_targets
+)
+
+
+# Examples
+add_executable(minimal examples/minimal.cpp)
+target_link_libraries(minimal PRIVATE matplotlib_cpp)
+set_target_properties(minimal PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(basic examples/basic.cpp)
+target_link_libraries(basic PRIVATE matplotlib_cpp)
+set_target_properties(basic PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(modern examples/modern.cpp)
+target_link_libraries(modern PRIVATE matplotlib_cpp)
+set_target_properties(modern PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(animation examples/animation.cpp)
+target_link_libraries(animation PRIVATE matplotlib_cpp)
+set_target_properties(animation PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(nonblock examples/nonblock.cpp)
+target_link_libraries(nonblock PRIVATE matplotlib_cpp)
+set_target_properties(nonblock PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(xkcd examples/xkcd.cpp)
+target_link_libraries(xkcd PRIVATE matplotlib_cpp)
+set_target_properties(xkcd PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(bar examples/bar.cpp)
+target_link_libraries(bar PRIVATE matplotlib_cpp)
+set_target_properties(bar PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(fill_inbetween examples/fill_inbetween.cpp)
+target_link_libraries(fill_inbetween PRIVATE matplotlib_cpp)
+set_target_properties(fill_inbetween PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(fill examples/fill.cpp)
+target_link_libraries(fill PRIVATE matplotlib_cpp)
+set_target_properties(fill PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(update examples/update.cpp)
+target_link_libraries(update PRIVATE matplotlib_cpp)
+set_target_properties(update PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(subplot2grid examples/subplot2grid.cpp)
+target_link_libraries(subplot2grid PRIVATE matplotlib_cpp)
+set_target_properties(subplot2grid PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+add_executable(lines3d examples/lines3d.cpp)
+target_link_libraries(lines3d PRIVATE matplotlib_cpp)
+set_target_properties(lines3d PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+if(Python3_NumPy_FOUND)
+  add_executable(surface examples/surface.cpp)
+  target_link_libraries(surface PRIVATE matplotlib_cpp)
+  set_target_properties(surface PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+
+  add_executable(colorbar examples/colorbar.cpp)
+  target_link_libraries(colorbar PRIVATE matplotlib_cpp)
+  set_target_properties(colorbar PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+endif()
+
+
+# Install headers
+install(FILES
+  "${PROJECT_SOURCE_DIR}/matplotlibcpp.h"
+  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+
+
+# Install targets file
+install(EXPORT install_targets
+  FILE
+    ${PACKAGE_NAME}Targets.cmake
+  NAMESPACE
+    ${PACKAGE_NAME}::
+  DESTINATION
+    ${INSTALL_CONFIGDIR}
+)
+
+
+# Install matplotlib_cppConfig.cmake
+include(CMakePackageConfigHelpers)
+configure_package_config_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${PACKAGE_NAME}Config.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/${PACKAGE_NAME}Config.cmake
+  INSTALL_DESTINATION ${INSTALL_CONFIGDIR}
+)
+install(FILES
+  ${CMAKE_CURRENT_BINARY_DIR}/${PACKAGE_NAME}Config.cmake
+  DESTINATION ${INSTALL_CONFIGDIR}
+)

cmake/matplotlib_cppConfig.cmake.in

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+get_filename_component(matplotlib_cpp_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
+
+if(NOT TARGET matplotlib_cpp::matplotlib_cpp)
+  find_package(Python3 COMPONENTS Interpreter Development REQUIRED)
+  find_package(Python3 COMPONENTS NumPy)
+  include("${matplotlib_cpp_CMAKE_DIR}/matplotlib_cppTargets.cmake")
+endif()