Add CMake find_package support and CTest integration

Author: gistrec

.gitignore

@@ -1,5 +1,6 @@
-Gtests
+GTests
 Sample
+build/
 
 ## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.

CMakeLists.txt

@@ -0,0 +1,58 @@
+cmake_minimum_required(VERSION 3.14)
+project(CppGeometryLibrary VERSION 1.0.0 LANGUAGES CXX)
+
+# Header-only interface target
+add_library(CppGeometryLibrary INTERFACE)
+add_library(CppGeometryLibrary::CppGeometryLibrary ALIAS CppGeometryLibrary)
+
+target_include_directories(CppGeometryLibrary INTERFACE
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:include>
+)
+target_compile_features(CppGeometryLibrary INTERFACE cxx_std_17)
+
+# Tests (optional, enabled when this is the top-level project)
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+    include(CTest)
+    if(BUILD_TESTING)
+        find_package(GTest REQUIRED)
+        add_executable(cpp_geometry_tests tests/Tests.cpp)
+        target_link_libraries(cpp_geometry_tests
+            PRIVATE CppGeometryLibrary GTest::GTest GTest::Main
+        )
+        add_test(NAME cpp_geometry_tests COMMAND cpp_geometry_tests)
+    endif()
+endif()
+
+# Installation
+include(GNUInstallDirs)
+
+install(DIRECTORY include/
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+)
+install(TARGETS CppGeometryLibrary
+    EXPORT CppGeometryLibraryTargets
+)
+install(EXPORT CppGeometryLibraryTargets
+    FILE CppGeometryLibraryTargets.cmake
+    NAMESPACE CppGeometryLibrary::
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/CppGeometryLibrary
+)
+
+include(CMakePackageConfigHelpers)
+
+configure_package_config_file(
+    cmake/CppGeometryLibraryConfig.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/CppGeometryLibraryConfig.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/CppGeometryLibrary
+)
+write_basic_package_version_file(
+    ${CMAKE_CURRENT_BINARY_DIR}/CppGeometryLibraryConfigVersion.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY AnyNewerVersion
+)
+install(FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/CppGeometryLibraryConfig.cmake
+    ${CMAKE_CURRENT_BINARY_DIR}/CppGeometryLibraryConfigVersion.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/CppGeometryLibrary
+)

README.md

@@ -25,6 +25,26 @@ C++ Geometry Library provides utility functions for the computation of geometric
 * [Spherical](https://developers.google.com/maps/documentation/javascript/reference#spherical) contains spherical geometry utilities allowing you to compute angles, distances and areas from latitudes and longitudes.
 * [Poly](https://developers.google.com/maps/documentation/javascript/reference#poly) utility functions for computations involving polygons and polylines.
 
+## Installation
+
+### CMake (recommended)
+
+```cmake
+find_package(CppGeometryLibrary REQUIRED)
+target_link_libraries(your_target PRIVATE CppGeometryLibrary::CppGeometryLibrary)
+```
+
+Or embed directly with `add_subdirectory`:
+
+```cmake
+add_subdirectory(cpp-geometry-library)
+target_link_libraries(your_target PRIVATE CppGeometryLibrary::CppGeometryLibrary)
+```
+
+### Manual
+
+Copy the `include/` directory into your project and add it to your include path.
+
 ## Usage
 
 You just need to include `SphericalUtil.hpp` or `PolyUtil.hpp`

cmake/CppGeometryLibraryConfig.cmake.in

@@ -0,0 +1,5 @@
+@PACKAGE_INIT@
+
+include("${CMAKE_CURRENT_LIST_DIR}/CppGeometryLibraryTargets.cmake")
+
+check_required_components(CppGeometryLibrary)