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Quadratic font curve path inspector

Project description

Path Inspector

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Path Inspector is a quadratic font curve path inspection application. The Python package installs the pathins command line executable and requires a Python v3.6+ interpreter.

The following sub-commands are available:

  • contours: path contour number report
  • coordinates: path coordinates report
  • direction: outermost contour path direction report
  • path: curve path report
  • segments: curve segment report, with line distances and quadratic curve arc lengths


pathins requires a Python 3.6+ interpreter.

Installation in a Python3 virtual environment is recommended.

Use any of the following installation approaches:

pip install from PyPI

$ pip3 install pathins

pip install from source

$ git clone
$ cd path-inspector
$ pip3 install -r requirements.txt .

Developer install from source

The following approach installs the project and associated optional developer dependencies, so that source changes are available without the need for re-installation.

$ git clone
$ cd path-inspector
$ pip3 install --ignore-installed -r requirements.txt -e ".[dev]"



See pathins --help for additional details.


Please report issues on the project issue tracker.


Contributions are warmly welcomed. A development dependency environment can be installed in editable mode with the developer installation documentation above.

Please use the standard Github pull request approach to propose source changes.

Source file linting

Python source files are linted with flake8. See the Makefile test-lint target for details.


The project runs continuous integration testing on the GitHub Actions service with the pytest toolchain. Test modules are located in the tests directory of the repository.

Local testing by Python interpreter version can be performed with the following command executed from the root of the repository:


Please see the tox documentation for additional details.

Test coverage

Unit test coverage is executed with the coverage tool. See the Makefile test-coverage target for details.


The Path Inspector project is built with the fantastic fontTools and skia-pathops free software libraries.


Copyright 2020 Source Foundry Authors and Contributors

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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