pivy_trackers

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A small python library of pivy/coin3D-based objects for renderning lines / nodes at the scenegraph level for user interface feedback. Implemented originally as a part of the FreeCAD Trails Workbnech.

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# pivy_trackers

pivy_trackers is a 2D geometry library built on [pivy](https://github.com/FreeCAD/pivy), the python bindings library for Coin3D that is a part of the [FreeCAD](https://github.com/FreeCAD/FreeCAD) project.

A "tracker" is simply geometry which "tracks with" the user as they interact with a tool to provide dynamic visual feedback.  A good example may be generating a "rubber band box" as a user clicks and drags over an area to select objects to provide a visual representation of the limits of their selection.

At the moment, pivy_trackers is tied to the FreeCAD API, though it may be adapted for another Coin3D application which implements pivy.

## Examples

Check out the wiki for [tracker examples](https://github.com/joelgraff/pivy_trackers/wiki/Examples)

## Motivation

Creating custom tools and workbenches in FreeCAD is greatly facilitated by the nearly one-to-one exposure of it's C++ API in Python, with the pivy Python bindings exposing to the underlying Coin3D scenegraph C++ API.

However, creating custom tools in FreeCAD that provide intuitive, visual feedback to the user poses a challenge as developers are forced to interact with the Coin3D scenegraph directly through pivy.

Pivy_trackers eases this process and provides several basic features which are valuable to most any 3D modelling tool, like selection / multi-selection, dragging, and rotation, insulating the developer from most of the inner workings of the scenegraph while still allowing for full customization of the tracker behaviors.

## Requirements

While pivy_trackers aims to be dependent only on pivy (and, by extension, Coin3D), it is currently tied to FreeCAD's object libraries.

Specifically:
+ [FreeCAD/pivy](https://github.com/FreeCAD/pivy)
+ [FreeCAD/FreeCAD View3DViewerPy](https://github.com/FreeCAD/FreeCAD/blob/1995f9d0bac63820c5c42ac0075c91a49cbad119/src/Gui/View3DViewerPy.h)
+ [PySide QTimer](https://pypi.org/project/PySide2/)

Additionally, pivy_trackers relies on the following projects included as git submodules:

* [FreeCAD_python_support (release branch)](https://github.com/joelgraff/freecad_python_support/tree/release)

IDE's which support git should update the submodules without issue.  However, the user is encouraged to refer to the [github submodule documentation](https://git-scm.com/book/en/v2/Git-Tools-Submodules) for furtrher assistance, as extra steps may be required to update the submodule paths in the project.

**Note:** The PySide dependency for FreeCAD, specifically, is a unique package maintained via the [FreeCAD-Daily PPA](https://launchpad.net/~freecad-maintainers/+archive/ubuntu/freecad-daily).

## Getting Started

Clone the project into a path visible through your project's top-level module.  Note the `--recursive` switch, which ensures the [FreeCAD_python_support submodule](https://github.com/joelgraff/freecad_python_support/tree/release) is also cloned:

```bash
cd /my/project/top/module/path
git clone --recursive https://github.com/joelgraff/pivy_trackers.git
```

## Usage

Pivy_trackers should be visible as a top-level module.  Thus, pivy_tracker classes can be imported directly as:

```python
from pivy_trackers.trait.base import Base
```

## Reference

+ [pivy](https://grey.colorado.edu/coin3d/index.html)
+ [pivy_trackers wiki](https://github.com/joelgraff/pivy_trackers/wiki)

Note that while the pivy API is not directly documented, it is a one-to-one exposure of the Coin3D API.  Thus, reviewing the Coin3D documentation will provide the user with most relevant implementation details.

Additional support can be found at the FreeCAD forums: https://forum.freecadweb.org/

## Contributors

Take a look at the wiki and project KanBan board for more information.  Feel free to reach out to me here or through the forums.  Contributions are greatly appreciated!

## License

[GNU LGPL v2.1](LICENSE)

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