gruppopotente / loki

Algorithms used to associate location information to an underlying graph

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Valhalla is an open source routing engine and accompanying libraries for use with Open Street Map data. This library, Loki, can be used to associate location information to an underlying graph tile object for use in creating input to the routing engine. In keeping with the Norse mythological theme, the name Loki was chosen as a play on the word locate. Since the library deals mostly with correlating some input (minimally a lat,lon) to an object within a graph tile, this seemed like a fitting name!

Build Status

Building

Loki uses the GNU Build System to configure and build itself. To install on a Debian or Ubuntu system you need to install its dependencies with:

srcipts/dependencies.sh

And then run to install it:

scripts/install.sh

Please see ./configure --help for more options on how to control the build process.

Using

For detailed information about what algorithms, data structures and executables are contained within loki, please see the more detailed documentation.

The build will produce both libraries and headers for use in other Valhalla organization projects, however you are free to use Loki for your own projects as well. To simplify the inclusion of the Loki library in another autotoolized project you may make use of loki m4 in your own configure.ac file. For an exmample of this please have a look at configure.ac in another one of the valhalla projects. Loki, and all of the projects under the Valhalla organization use the MIT License.

Contributing

We welcome contributions to loki. If you would like to report an issue, or even better fix an existing one, please use the loki issue tracker on GitHub.

If you would like to make an improvement to the code, please be aware that all valhalla projects are written mostly in C++11, in the K&R (1TBS variant) with two spaces as indentation. We generally follow this c++ style guide. We welcome contributions as pull requests to the repository and highly recommend that your pull request include a test to validate the addition/change of functionality.

Tests

We highly encourage running and updating the tests to make sure no regressions have been made. We use the Automake test suite to run our tests by simply making the check target:

make check

You can also build a test coverage report. This requires that the packages lcov, gcov and genhtml be installed. On Ubuntu you can get these with:

sudo apt-get install lcov

To make the coverage report, configure the build for it:

./configure --enable-coverage

And generate an HTML coverage report in the coverage/ directory:

make coverage-report

Note also that, because calculating the coverage requires compiler support, you will need to clean any object files from a non-coverage build by running make clean before make coverage-report.