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GitHub - google/s2geometry: Computational geometry and spatial indexing on the sphere
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id="validation-59207ef3-5392-4afa-a115-4c815d34bf47" hidden="hidden"> <span class="FormControl-inlineValidation--visual"> <svg aria-hidden="true" height="12" viewBox="0 0 12 12" version="1.1" width="12" data-view-component="true" class="octicon octicon-alert-fill"> <path d="M4.855.708c.5-.896 1.79-.896 2.29 0l4.675 8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path> </svg> </span> <span></span> </div> </div> <div data-target="query-builder.screenReaderFeedback" aria-live="polite" aria-atomic="true" class="sr-only"></div> </query-builder></form> <div class="d-flex flex-row color-fg-muted px-3 text-small color-bg-default search-feedback-prompt"> <a target="_blank" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax" data-view-component="true" class="Link color-fg-accent text-normal ml-2">Search syntax tips</a> <div class="d-flex flex-1"></div> </div> </div> </div> </div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="feedback-dialog" aria-modal="true" aria-labelledby="feedback-dialog-title" aria-describedby="feedback-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="feedback-dialog-title"> Provide feedback </h1> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="feedback-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button 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seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> <label for="include_email" style="font-weight: normal">Include my email address so I can be contacted</label> </form></div> </scrollable-region> <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd"> <button data-close-dialog-id="feedback-dialog" type="button" data-view-component="true" class="btn"> Cancel </button> <button form="code-search-feedback-form" data-action="click:qbsearch-input#submitFeedback" type="submit" data-view-component="true" class="btn-primary btn"> Submit feedback </button> </div> </dialog></dialog-helper> <custom-scopes data-target="qbsearch-input.customScopesManager"> <dialog-helper> <dialog data-target="custom-scopes.customScopesModalDialog" data-action="close:qbsearch-input#handleDialogClose cancel:qbsearch-input#handleDialogClose" id="custom-scopes-dialog" aria-modal="true" aria-labelledby="custom-scopes-dialog-title" aria-describedby="custom-scopes-dialog-description" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-medium Overlay--motion-scaleFade Overlay--disableScroll"> <div data-view-component="true" class="Overlay-header Overlay-header--divided"> <div class="Overlay-headerContentWrap"> <div class="Overlay-titleWrap"> <h1 class="Overlay-title " id="custom-scopes-dialog-title"> Saved searches </h1> <h2 id="custom-scopes-dialog-description" class="Overlay-description">Use saved searches to filter your results more quickly</h2> </div> <div class="Overlay-actionWrap"> <button data-close-dialog-id="custom-scopes-dialog" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="custom-scopes-dialog-title"> <div data-view-component="true" class="Overlay-body"> <div data-target="custom-scopes.customScopesModalDialogFlash"></div> <div hidden class="create-custom-scope-form" data-target="custom-scopes.createCustomScopeForm"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="custom-scopes-dialog-form" data-turbo="false" action="/search/custom_scopes" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" 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Library\u003c/h1\u003e\u003ca id=\"user-content-s2-geometry-library\" class=\"anchor\" aria-label=\"Permalink: S2 Geometry Library\" href=\"#s2-geometry-library\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOverview\u003c/h2\u003e\u003ca id=\"user-content-overview\" class=\"anchor\" aria-label=\"Permalink: Overview\" href=\"#overview\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is a package for manipulating geometric shapes. Unlike many geometry\nlibraries, S2 is primarily designed to work with \u003cem\u003espherical geometry\u003c/em\u003e, i.e.,\nshapes drawn on a sphere rather than on a planar 2D map. This makes it\nespecially suitable for working with geographic data.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf you want to learn more about the library, start by reading the\n\u003ca href=\"http://s2geometry.io/about/overview\" rel=\"nofollow\"\u003eoverview\u003c/a\u003e and \u003ca href=\"http://s2geometry.io/devguide/cpp/quickstart\" rel=\"nofollow\"\u003equick start\ndocument\u003c/a\u003e, then read the\nintroduction to the \u003ca href=\"http://s2geometry.io/devguide/basic_types\" rel=\"nofollow\"\u003ebasic types\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eS2 documentation can be found on \u003ca href=\"http://s2geometry.io\" rel=\"nofollow\"\u003es2geometry.io\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAPI/ABI Stability\u003c/h2\u003e\u003ca id=\"user-content-apiabi-stability\" class=\"anchor\" aria-label=\"Permalink: API/ABI Stability\" href=\"#apiabi-stability\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNote that all \u003ca href=\"https://github.com/google/s2geometry/releases\"\u003ereleases\u003c/a\u003e are\nversion 0.x, so there are\n\u003ca href=\"https://semver.org/#spec-item-4\" rel=\"nofollow\"\u003eno API or ABI stability guarantees\u003c/a\u003e.\nStarting with 1.0 we will adhere to \u003ca href=\"https://semver.org/\" rel=\"nofollow\"\u003eSemVer\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe Python API is particularly unstable, and it is planned that the SWIGged\nAPI will be replaced by a pybind11 version with more Pythonic names and more\ncomplete functionality.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRequirements for End Users using Bazel\u003c/h2\u003e\u003ca id=\"user-content-requirements-for-end-users-using-bazel\" class=\"anchor\" aria-label=\"Permalink: Requirements for End Users using Bazel\" href=\"#requirements-for-end-users-using-bazel\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuild\u003c/h2\u003e\u003ca id=\"user-content-build\" class=\"anchor\" aria-label=\"Permalink: Build\" href=\"#build\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis bazel build requires 7.0.0 – bzlmod default. Builds were tested using\nC++20 as set in .bazelrc. This setup relies on abseil-cpp, boringssl, and\ngoogletest from the bazel central repository as set in MODULE.bazel.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo build and test using bazel, from within s2geometry/src, run:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ebazel test \"//:*\"\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo build the libary without testing, from within s2geometry/src, run:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003ebazel build //:s2\u003c/code\u003e\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStatus\u003c/h2\u003e\u003ca id=\"user-content-status\" class=\"anchor\" aria-label=\"Permalink: Status\" href=\"#status\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAll tests enumerated in the BUILD.bazel file pass on x86 machines. On\nApple M1, s2loop_measures_test fails due to a 6% excess accumlated error.\nThis issue may require revision of boringssl or exactfloat.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRequirements for End Users using CMake\u003c/h2\u003e\u003ca id=\"user-content-requirements-for-end-users-using-cmake\" class=\"anchor\" aria-label=\"Permalink: Requirements for End Users using CMake\" href=\"#requirements-for-end-users-using-cmake\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"http://www.cmake.org/\" rel=\"nofollow\"\u003eCMake\u003c/a\u003e \u0026gt;= 3.5\u003c/li\u003e\n\u003cli\u003eA C++ compiler with C++14 support, such as \u003ca href=\"https://gcc.gnu.org/\" rel=\"nofollow\"\u003eg++ \u0026gt;= 5\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/abseil/abseil-cpp\"\u003eAbseil\u003c/a\u003e \u0026gt;= LTS\n\u003ca href=\"https://github.com/abseil/abseil-cpp/releases/tag/20240722.0\"\u003e\u003ccode\u003e20240722\u003c/code\u003e\u003c/a\u003e\n(standard library extensions)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/openssl/openssl\"\u003eOpenSSL\u003c/a\u003e (for its bignum library)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/google/googletest\"\u003egoogletest testing framework \u0026gt;= 1.10\u003c/a\u003e\n(to build tests and example programs, optional)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eOn Ubuntu, all of these other than abseil can be installed via apt-get:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"sudo apt-get install cmake googletest libssl-dev\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003esudo apt-get install cmake googletest libssl-dev\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eabseil-cpp may need to be installed from source if an LTS release is not\npackaged for the platform. See the use of \u003ccode\u003e-DCMAKE_PREFIX_PATH\u003c/code\u003e in the\n\u003ca href=\"#building\"\u003ebuild instructions below\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOn macOS, use \u003ca href=\"http://www.macports.org/\" rel=\"nofollow\"\u003eMacPorts\u003c/a\u003e or\n\u003ca href=\"http://brew.sh/\" rel=\"nofollow\"\u003eHomebrew\u003c/a\u003e. For MacPorts:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"sudo port install cmake abseil gtest openssl\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003esudo port install cmake abseil gtest openssl\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ethen use\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"cmake -DGOOGLETEST_ROOT=/opt/local/src -DCMAKE_PREFIX_PATH=/opt/local ..\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ecmake -DGOOGLETEST_ROOT=/opt/local/src -DCMAKE_PREFIX_PATH=/opt/local ..\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ein the build instructions below.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThorough testing has only been done on Ubuntu 14.04.3 and macOS 10.13.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuild and Install\u003c/h2\u003e\u003ca id=\"user-content-build-and-install\" class=\"anchor\" aria-label=\"Permalink: Build and Install\" href=\"#build-and-install\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYou may either download the source as a ZIP archive, or \u003ca href=\"https://help.github.com/articles/cloning-a-repository/\"\u003eclone the git\nrepository\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eVia ZIP archive\u003c/h3\u003e\u003ca id=\"user-content-via-zip-archive\" class=\"anchor\" aria-label=\"Permalink: Via ZIP archive\" href=\"#via-zip-archive\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eDownload \u003ca href=\"https://github.com/google/s2geometry/archive/master.zip\"\u003eZIP file\u003c/a\u003e\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"cd [parent of directory where you want to put S2]\nunzip [path to ZIP file]/s2geometry-master.zip\ncd s2geometry-master\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ecd [parent of directory where you want to put S2]\nunzip [path to ZIP file]/s2geometry-master.zip\ncd s2geometry-master\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eVia \u003ccode\u003egit clone\u003c/code\u003e\u003c/h3\u003e\u003ca id=\"user-content-via-git-clone\" class=\"anchor\" aria-label=\"Permalink: Via git clone\" href=\"#via-git-clone\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"cd [parent of directory where you want to put S2]\ngit clone https://github.com/google/s2geometry.git\ncd s2geometry\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ecd [parent of directory where you want to put S2]\ngit clone https://github.com/google/s2geometry.git\ncd s2geometry\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eBuilding\u003c/h3\u003e\u003ca id=\"user-content-building\" class=\"anchor\" aria-label=\"Permalink: Building\" href=\"#building\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFirst, \u003ca href=\"https://github.com/abseil/abseil-cpp/blob/master/CMake/README.md#traditional-cmake-set-up\"\u003einstall Abseil\u003c/a\u003e.\nIt must be configured with \u003ccode\u003e-DCMAKE_POSITION_INDEPENDENT_CODE=ON\u003c/code\u003e.\ns2geometry must be configured to use the same C++ version that\nabseil uses. The easiest way to achieve this is to pass\n\u003ccode\u003e-DCMAKE_CXX_STANDARD=14\u003c/code\u003e (or \u003ccode\u003e-DCMAKE_CXX_STANDARD=17\u003c/code\u003e) to \u003ccode\u003ecmake\u003c/code\u003e\nwhen compiling both abseil and s2geometry.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFrom the appropriate directory depending on how you got the source:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"mkdir build\ncd build\n# You can omit -DGOOGLETEST_ROOT to skip tests; see above for macOS.\n# Use the same CMAKE_CXX_STANDARD value that was used with absl.\ncmake -DGOOGLETEST_ROOT=/usr/src/googletest -DCMAKE_PREFIX_PATH=/path/to/absl/install -DCMAKE_CXX_STANDARD=14 ..\nmake -j $(nproc)\nmake test ARGS=\u0026quot;-j$(nproc)\u0026quot; # If GOOGLETEST_ROOT specified above.\nsudo make install\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003emkdir build\ncd build\n# You can omit -DGOOGLETEST_ROOT to skip tests; see above for macOS.\n# Use the same CMAKE_CXX_STANDARD value that was used with absl.\ncmake -DGOOGLETEST_ROOT=/usr/src/googletest -DCMAKE_PREFIX_PATH=/path/to/absl/install -DCMAKE_CXX_STANDARD=14 ..\nmake -j $(nproc)\nmake test ARGS=\"-j$(nproc)\" # If GOOGLETEST_ROOT specified above.\nsudo make install\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOn macOS, \u003ccode\u003esysctl -n hw.logicalcpu\u003c/code\u003e is the equivalent of \u003ccode\u003enproc\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eDisable building of shared libraries with \u003ccode\u003e-DBUILD_SHARED_LIBS=OFF\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eEnable the python interface with \u003ccode\u003e-DWITH_PYTHON=ON\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIf OpenSSL is installed in a non-standard location set \u003ccode\u003eOPENSSL_ROOT_DIR\u003c/code\u003e\nbefore running configure, for example on macOS:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"OPENSSL_ROOT_DIR=/opt/homebrew/Cellar/openssl@3/3.1.0 cmake -DCMAKE_PREFIX_PATH=/opt/homebrew -DCMAKE_CXX_STANDARD=17\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eOPENSSL_ROOT_DIR=/opt/homebrew/Cellar/openssl@3/3.1.0 cmake -DCMAKE_PREFIX_PATH=/opt/homebrew -DCMAKE_CXX_STANDARD=17\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eInstalling\u003c/h2\u003e\u003ca id=\"user-content-installing\" class=\"anchor\" aria-label=\"Permalink: Installing\" href=\"#installing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFrom \u003ccode\u003ebuild\u003c/code\u003e subdirectory:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"make install\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003emake install\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ePrefix it with \u003ccode\u003esudo\u003c/code\u003e if needed:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"sudo make install\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003esudo make install\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003cem\u003eNOTE\u003c/em\u003e: There is not \u003ccode\u003euninstall\u003c/code\u003e target but \u003ccode\u003einstall_manifest.txt\u003c/code\u003e may be helpful.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAll files will be installed at location specified in \u003ccode\u003eCMAKE_INSTALL_PREFIX\u003c/code\u003e variable.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eSeveral suffix variables used for some file groups:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eVariable\u003c/th\u003e\n\u003cth\u003eDefault\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eCMAKE_INSTALL_INCLUDEDIR\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003einclude\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eFor header files\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eCMAKE_INSTALL_BINDIR\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003ebin\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eFor executables and \u003ccode\u003e*.dll\u003c/code\u003e files on \u003ccode\u003eDLL\u003c/code\u003e-based platforms\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ccode\u003eCMAKE_INSTALL_LIBDIR\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003e\u003ccode\u003elib\u003c/code\u003e\u003c/td\u003e\n\u003ctd\u003eFor library files (\u003ccode\u003e*.so\u003c/code\u003e, \u003ccode\u003e*.a\u003c/code\u003e, \u003ccode\u003e*.lib\u003c/code\u003e etc)\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eIf needed set this variables on command line as \u003ccode\u003ecmake\u003c/code\u003e arguments with \u003ccode\u003e-D\u003c/code\u003e prefix or edit from \u003ccode\u003ebuild\u003c/code\u003e subdirectory:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"make edit_cache\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003emake edit_cache\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFor more info read: \u003ca href=\"https://cmake.org/cmake/help/latest/guide/user-interaction/index.html#the-cmake-cache\" rel=\"nofollow\"\u003eThe CMake Cache\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePython\u003c/h2\u003e\u003ca id=\"user-content-python\" class=\"anchor\" aria-label=\"Permalink: Python\" href=\"#python\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf you want the Python interface, you need to run cmake using\n\u003ccode\u003e-DWITH_PYTHON=ON\u003c/code\u003e. You will also need to install the following dependencies:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/swig/swig\"\u003eSWIG 4\u003c/a\u003e (for Python support, optional)\u003c/li\u003e\n\u003cli\u003epython3-dev (for Python support, optional)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003ewhich can be installed via\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"sudo apt-get install swig python3-dev\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003esudo apt-get install swig python3-dev\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eor on macOS:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"sudo port install swig\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003esudo port install swig\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eVersion 4.0 is required, but it should be easy to make it work 3.0 or probably\neven 2.0.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003ePython 3 is required.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCreating wheels\u003c/h3\u003e\u003ca id=\"user-content-creating-wheels\" class=\"anchor\" aria-label=\"Permalink: Creating wheels\" href=\"#creating-wheels\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eFirst, make a virtual environment and install \u003ccode\u003ebuild\u003c/code\u003e into it:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"python3 -m venv venv\nsource venv/bin/activate\npip install build\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003epython3 -m venv venv\nsource venv/bin/activate\npip install build\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThen build the wheel:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"python -m build\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003epython -m build\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe resulting wheel will be in the \u003ccode\u003edist\u003c/code\u003e directory.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf OpenSSL is in a non-standard location make sure to set \u003ccode\u003eOPENSSL_ROOT_DIR\u003c/code\u003e;\nsee above for more information.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eOther S2 implementations\u003c/h2\u003e\u003ca id=\"user-content-other-s2-implementations\" class=\"anchor\" aria-label=\"Permalink: Other S2 implementations\" href=\"#other-s2-implementations\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/golang/geo\"\u003eGo\u003c/a\u003e (Approximately 40% complete.)\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/google/s2-geometry-library-java\"\u003eJava\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://github.com/Enovea/s2-geometry-kotlin\"\u003eKotlin\u003c/a\u003e (Complete except binary serialization)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eDisclaimer\u003c/h2\u003e\u003ca id=\"user-content-disclaimer\" class=\"anchor\" aria-label=\"Permalink: Disclaimer\" href=\"#disclaimer\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 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dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">S2 Geometry Library</h1><a id="user-content-s2-geometry-library" class="anchor" aria-label="Permalink: S2 Geometry Library" href="#s2-geometry-library"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Overview</h2><a id="user-content-overview" class="anchor" aria-label="Permalink: Overview" href="#overview"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is a package for manipulating geometric shapes. Unlike many geometry libraries, S2 is primarily designed to work with <em>spherical geometry</em>, i.e., shapes drawn on a sphere rather than on a planar 2D map. This makes it especially suitable for working with geographic data.</p> <p dir="auto">If you want to learn more about the library, start by reading the <a href="http://s2geometry.io/about/overview" rel="nofollow">overview</a> and <a href="http://s2geometry.io/devguide/cpp/quickstart" rel="nofollow">quick start document</a>, then read the introduction to the <a href="http://s2geometry.io/devguide/basic_types" rel="nofollow">basic types</a>.</p> <p dir="auto">S2 documentation can be found on <a href="http://s2geometry.io" rel="nofollow">s2geometry.io</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">API/ABI Stability</h2><a id="user-content-apiabi-stability" class="anchor" aria-label="Permalink: API/ABI Stability" href="#apiabi-stability"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Note that all <a href="https://github.com/google/s2geometry/releases">releases</a> are version 0.x, so there are <a href="https://semver.org/#spec-item-4" rel="nofollow">no API or ABI stability guarantees</a>. Starting with 1.0 we will adhere to <a href="https://semver.org/" rel="nofollow">SemVer</a>.</p> <p dir="auto">The Python API is particularly unstable, and it is planned that the SWIGged API will be replaced by a pybind11 version with more Pythonic names and more complete functionality.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Requirements for End Users using Bazel</h2><a id="user-content-requirements-for-end-users-using-bazel" class="anchor" aria-label="Permalink: Requirements for End Users using Bazel" href="#requirements-for-end-users-using-bazel"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Build</h2><a id="user-content-build" class="anchor" aria-label="Permalink: Build" href="#build"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This bazel build requires 7.0.0 – bzlmod default. Builds were tested using C++20 as set in .bazelrc. This setup relies on abseil-cpp, boringssl, and googletest from the bazel central repository as set in MODULE.bazel.</p> <p dir="auto">To build and test using bazel, from within s2geometry/src, run:</p> <p dir="auto"><code>bazel test "//:*"</code></p> <p dir="auto">To build the libary without testing, from within s2geometry/src, run:</p> <p dir="auto"><code>bazel build //:s2</code></p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Status</h2><a id="user-content-status" class="anchor" aria-label="Permalink: Status" href="#status"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">All tests enumerated in the BUILD.bazel file pass on x86 machines. On Apple M1, s2loop_measures_test fails due to a 6% excess accumlated error. This issue may require revision of boringssl or exactfloat.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Requirements for End Users using CMake</h2><a id="user-content-requirements-for-end-users-using-cmake" class="anchor" aria-label="Permalink: Requirements for End Users using CMake" href="#requirements-for-end-users-using-cmake"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="http://www.cmake.org/" rel="nofollow">CMake</a> >= 3.5</li> <li>A C++ compiler with C++14 support, such as <a href="https://gcc.gnu.org/" rel="nofollow">g++ >= 5</a></li> <li><a href="https://github.com/abseil/abseil-cpp">Abseil</a> >= LTS <a href="https://github.com/abseil/abseil-cpp/releases/tag/20240722.0"><code>20240722</code></a> (standard library extensions)</li> <li><a href="https://github.com/openssl/openssl">OpenSSL</a> (for its bignum library)</li> <li><a href="https://github.com/google/googletest">googletest testing framework >= 1.10</a> (to build tests and example programs, optional)</li> </ul> <p dir="auto">On Ubuntu, all of these other than abseil can be installed via apt-get:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="sudo apt-get install cmake googletest libssl-dev"><pre class="notranslate"><code>sudo apt-get install cmake googletest libssl-dev </code></pre></div> <p dir="auto">abseil-cpp may need to be installed from source if an LTS release is not packaged for the platform. See the use of <code>-DCMAKE_PREFIX_PATH</code> in the <a href="#building">build instructions below</a>.</p> <p dir="auto">On macOS, use <a href="http://www.macports.org/" rel="nofollow">MacPorts</a> or <a href="http://brew.sh/" rel="nofollow">Homebrew</a>. For MacPorts:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="sudo port install cmake abseil gtest openssl"><pre class="notranslate"><code>sudo port install cmake abseil gtest openssl </code></pre></div> <p dir="auto">then use</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="cmake -DGOOGLETEST_ROOT=/opt/local/src -DCMAKE_PREFIX_PATH=/opt/local .."><pre class="notranslate"><code>cmake -DGOOGLETEST_ROOT=/opt/local/src -DCMAKE_PREFIX_PATH=/opt/local .. </code></pre></div> <p dir="auto">in the build instructions below.</p> <p dir="auto">Thorough testing has only been done on Ubuntu 14.04.3 and macOS 10.13.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Build and Install</h2><a id="user-content-build-and-install" class="anchor" aria-label="Permalink: Build and Install" href="#build-and-install"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">You may either download the source as a ZIP archive, or <a href="https://help.github.com/articles/cloning-a-repository/">clone the git repository</a>.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Via ZIP archive</h3><a id="user-content-via-zip-archive" class="anchor" aria-label="Permalink: Via ZIP archive" href="#via-zip-archive"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Download <a href="https://github.com/google/s2geometry/archive/master.zip">ZIP file</a></p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="cd [parent of directory where you want to put S2] unzip [path to ZIP file]/s2geometry-master.zip cd s2geometry-master"><pre class="notranslate"><code>cd [parent of directory where you want to put S2] unzip [path to ZIP file]/s2geometry-master.zip cd s2geometry-master </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Via <code>git clone</code></h3><a id="user-content-via-git-clone" class="anchor" aria-label="Permalink: Via git clone" href="#via-git-clone"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="cd [parent of directory where you want to put S2] git clone https://github.com/google/s2geometry.git cd s2geometry"><pre class="notranslate"><code>cd [parent of directory where you want to put S2] git clone https://github.com/google/s2geometry.git cd s2geometry </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Building</h3><a id="user-content-building" class="anchor" aria-label="Permalink: Building" href="#building"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">First, <a href="https://github.com/abseil/abseil-cpp/blob/master/CMake/README.md#traditional-cmake-set-up">install Abseil</a>. It must be configured with <code>-DCMAKE_POSITION_INDEPENDENT_CODE=ON</code>. s2geometry must be configured to use the same C++ version that abseil uses. The easiest way to achieve this is to pass <code>-DCMAKE_CXX_STANDARD=14</code> (or <code>-DCMAKE_CXX_STANDARD=17</code>) to <code>cmake</code> when compiling both abseil and s2geometry.</p> <p dir="auto">From the appropriate directory depending on how you got the source:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="mkdir build cd build # You can omit -DGOOGLETEST_ROOT to skip tests; see above for macOS. # Use the same CMAKE_CXX_STANDARD value that was used with absl. cmake -DGOOGLETEST_ROOT=/usr/src/googletest -DCMAKE_PREFIX_PATH=/path/to/absl/install -DCMAKE_CXX_STANDARD=14 .. make -j $(nproc) make test ARGS="-j$(nproc)" # If GOOGLETEST_ROOT specified above. sudo make install"><pre class="notranslate"><code>mkdir build cd build # You can omit -DGOOGLETEST_ROOT to skip tests; see above for macOS. # Use the same CMAKE_CXX_STANDARD value that was used with absl. cmake -DGOOGLETEST_ROOT=/usr/src/googletest -DCMAKE_PREFIX_PATH=/path/to/absl/install -DCMAKE_CXX_STANDARD=14 .. make -j $(nproc) make test ARGS="-j$(nproc)" # If GOOGLETEST_ROOT specified above. sudo make install </code></pre></div> <p dir="auto">On macOS, <code>sysctl -n hw.logicalcpu</code> is the equivalent of <code>nproc</code>.</p> <p dir="auto">Disable building of shared libraries with <code>-DBUILD_SHARED_LIBS=OFF</code>.</p> <p dir="auto">Enable the python interface with <code>-DWITH_PYTHON=ON</code>.</p> <p dir="auto">If OpenSSL is installed in a non-standard location set <code>OPENSSL_ROOT_DIR</code> before running configure, for example on macOS:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="OPENSSL_ROOT_DIR=/opt/homebrew/Cellar/openssl@3/3.1.0 cmake -DCMAKE_PREFIX_PATH=/opt/homebrew -DCMAKE_CXX_STANDARD=17"><pre class="notranslate"><code>OPENSSL_ROOT_DIR=/opt/homebrew/Cellar/openssl@3/3.1.0 cmake -DCMAKE_PREFIX_PATH=/opt/homebrew -DCMAKE_CXX_STANDARD=17 </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Installing</h2><a id="user-content-installing" class="anchor" aria-label="Permalink: Installing" href="#installing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">From <code>build</code> subdirectory:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="make install"><pre class="notranslate"><code>make install </code></pre></div> <p dir="auto">Prefix it with <code>sudo</code> if needed:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="sudo make install"><pre class="notranslate"><code>sudo make install </code></pre></div> <p dir="auto"><em>NOTE</em>: There is not <code>uninstall</code> target but <code>install_manifest.txt</code> may be helpful.</p> <p dir="auto">All files will be installed at location specified in <code>CMAKE_INSTALL_PREFIX</code> variable.</p> <p dir="auto">Several suffix variables used for some file groups:</p> <markdown-accessiblity-table><table> <thead> <tr> <th>Variable</th> <th>Default</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td><code>CMAKE_INSTALL_INCLUDEDIR</code></td> <td><code>include</code></td> <td>For header files</td> </tr> <tr> <td><code>CMAKE_INSTALL_BINDIR</code></td> <td><code>bin</code></td> <td>For executables and <code>*.dll</code> files on <code>DLL</code>-based platforms</td> </tr> <tr> <td><code>CMAKE_INSTALL_LIBDIR</code></td> <td><code>lib</code></td> <td>For library files (<code>*.so</code>, <code>*.a</code>, <code>*.lib</code> etc)</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">If needed set this variables on command line as <code>cmake</code> arguments with <code>-D</code> prefix or edit from <code>build</code> subdirectory:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="make edit_cache"><pre class="notranslate"><code>make edit_cache </code></pre></div> <p dir="auto">For more info read: <a href="https://cmake.org/cmake/help/latest/guide/user-interaction/index.html#the-cmake-cache" rel="nofollow">The CMake Cache</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Python</h2><a id="user-content-python" class="anchor" aria-label="Permalink: Python" href="#python"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If you want the Python interface, you need to run cmake using <code>-DWITH_PYTHON=ON</code>. You will also need to install the following dependencies:</p> <ul dir="auto"> <li><a href="https://github.com/swig/swig">SWIG 4</a> (for Python support, optional)</li> <li>python3-dev (for Python support, optional)</li> </ul> <p dir="auto">which can be installed via</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="sudo apt-get install swig python3-dev"><pre class="notranslate"><code>sudo apt-get install swig python3-dev </code></pre></div> <p dir="auto">or on macOS:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="sudo port install swig"><pre class="notranslate"><code>sudo port install swig </code></pre></div> <p dir="auto">Version 4.0 is required, but it should be easy to make it work 3.0 or probably even 2.0.</p> <p dir="auto">Python 3 is required.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Creating wheels</h3><a id="user-content-creating-wheels" class="anchor" aria-label="Permalink: Creating wheels" href="#creating-wheels"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">First, make a virtual environment and install <code>build</code> into it:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="python3 -m venv venv source venv/bin/activate pip install build"><pre class="notranslate"><code>python3 -m venv venv source venv/bin/activate pip install build </code></pre></div> <p dir="auto">Then build the wheel:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="python -m build"><pre class="notranslate"><code>python -m build </code></pre></div> <p dir="auto">The resulting wheel will be in the <code>dist</code> directory.</p> <blockquote> <p dir="auto">If OpenSSL is in a non-standard location make sure to set <code>OPENSSL_ROOT_DIR</code>; see above for more information.</p> </blockquote> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Other S2 implementations</h2><a id="user-content-other-s2-implementations" class="anchor" aria-label="Permalink: Other S2 implementations" href="#other-s2-implementations"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <ul dir="auto"> <li><a href="https://github.com/golang/geo">Go</a> (Approximately 40% complete.)</li> <li><a href="https://github.com/google/s2-geometry-library-java">Java</a></li> <li><a href="https://github.com/Enovea/s2-geometry-kotlin">Kotlin</a> (Complete except binary serialization)</li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Disclaimer</h2><a id="user-content-disclaimer" class="anchor" aria-label="Permalink: Disclaimer" href="#disclaimer"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This is not an official Google product.</p> </article></div></div></div></div></div> <!-- --> <!-- --> <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-partial> <input type="hidden" data-csrf="true" value="9kXAQuZNQ9MGAtoEkiwoOjCQkE67ssdYYIyhXht0fwoHEU0R+NO9mZF0fXp4FYLnCnmiywav9lb0Btu/TRzhrg==" /> </div> <div data-view-component="true" class="Layout-sidebar"> <div class="BorderGrid about-margin" data-pjax> <div class="BorderGrid-row"> <div class="BorderGrid-cell"> <div class="hide-sm hide-md"> <h2 class="mb-3 h4">About</h2> <p class="f4 my-3"> Computational geometry and spatial indexing on the sphere </p> <div class="my-3 d-flex flex-items-center"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link flex-shrink-0 mr-2"> <path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path> </svg> <span class="flex-auto min-width-0 css-truncate css-truncate-target width-fit"> <a title="http://s2geometry.io/" role="link" target="_blank" rel="noopener noreferrer nofollow" class="text-bold" href="http://s2geometry.io/">s2geometry.io/</a> </span> </div> <h3 class="sr-only">Topics</h3> <div class="my-3"> <div class="f6"> <a href="/topics/geometry" title="Topic: geometry" data-view-component="true" class="topic-tag topic-tag-link"> geometry </a> <a href="/topics/s2" title="Topic: s2" data-view-component="true" class="topic-tag topic-tag-link"> s2 </a> <a href="/topics/spherical-geometry" title="Topic: spherical-geometry" data-view-component="true" class="topic-tag topic-tag-link"> 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2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path> </svg> <strong>2.4k</strong> stars</a> </div> <h3 class="sr-only">Watchers</h3> <div class="mt-2"> <a href="/google/s2geometry/watchers" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-eye mr-2"> <path d="M8 2c1.981 0 3.671.992 4.933 2.078 1.27 1.091 2.187 2.345 2.637 3.023a1.62 1.62 0 0 1 0 1.798c-.45.678-1.367 1.932-2.637 3.023C11.67 13.008 9.981 14 8 14c-1.981 0-3.671-.992-4.933-2.078C1.797 10.83.88 9.576.43 8.898a1.62 1.62 0 0 1 0-1.798c.45-.677 1.367-1.931 2.637-3.022C4.33 2.992 6.019 2 8 2ZM1.679 7.932a.12.12 0 0 0 0 .136c.411.622 1.241 1.75 2.366 2.717C5.176 11.758 6.527 12.5 8 12.5c1.473 0 2.825-.742 3.955-1.715 1.124-.967 1.954-2.096 2.366-2.717a.12.12 0 0 0 0-.136c-.412-.621-1.242-1.75-2.366-2.717C10.824 4.242 9.473 3.5 8 3.5c-1.473 0-2.825.742-3.955 1.715-1.124.967-1.954 2.096-2.366 2.717ZM8 10a2 2 0 1 1-.001-3.999A2 2 0 0 1 8 10Z"></path> </svg> <strong>69</strong> watching</a> </div> <h3 class="sr-only">Forks</h3> <div class="mt-2"> <a href="/google/s2geometry/forks" data-view-component="true" class="Link Link--muted"><svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2"> <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path> </svg> <strong>320</strong> forks</a> </div> <div class="mt-2"> <a class="Link--muted" 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5.026a1.75 1.75 0 0 1-2.474 0l-6.25-6.25A1.752 1.752 0 0 1 1 7.775Zm1.5 0c0 .066.026.13.073.177l6.25 6.25a.25.25 0 0 0 .354 0l5.025-5.025a.25.25 0 0 0 0-.354l-6.25-6.25a.25.25 0 0 0-.177-.073H2.75a.25.25 0 0 0-.25.25ZM6 5a1 1 0 1 1 0 2 1 1 0 0 1 0-2Z"></path> </svg> <div class="ml-2 min-width-0"> <div class="d-flex"> <span class="css-truncate css-truncate-target text-bold mr-2" style="max-width: none;">v0.12.0</span> <span title="Label: Latest" data-view-component="true" class="Label Label--success flex-shrink-0"> Latest </span> </div> <div class="text-small color-fg-muted"><relative-time datetime="2025-02-17T12:57:22Z" class="no-wrap">Feb 17, 2025</relative-time></div> </div> </a> <div data-view-component="true" class="mt-3"> <a text="small" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/google/s2geometry/releases" data-view-component="true" class="Link">+ 8 releases</a></div> </div> </div> <div class="BorderGrid-row"> <div 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