QtNodes #######

Introduction

QtNodes is conceived as a general-purpose Qt-based library aimed at developing Node Editors for various applications. The library could be used for simple graph visualization and editing or extended further for using the

_ .

The library is written using the Model-View approach. The whole graph structure is defined by a class derived from

. It is possible to create or add Nodes and Connections. The underlying data structures could be of any arbitrary type or representation.

An instance of

could or could not be attached to specialized

QGraphicsScene

and

QGraphicsView

objects. I.e. the so-called "headless"

modus operandi

is possible.

Documentation

_

Warning Many classes were changed in the version

. If you had a large project based on

2.x.x

, make sure you read the documentation first and see the examples before checking out the new code.

Branches

There are branchses

and

v3

for versions

2.x.x

and

3.x

respectively. The branch

master

contains the latest dev state.

.. contents:: Navigation :depth: 2

Data Flow Paradigm

The extended model class

allows to register "processing algorithms" represented by nodes and is equipped with a set of Qt's signals and slots for propagating the data though the nodes.

The node's algorithm is triggered upon arriving of any new input data. The computed result is propagated to the output connections. Each new connection fetches available data and propagates is further. Each change in the source node is immediately propagated through all the connections updating the whole graph.

Supported Environments

Platforms

• Linux (x64, gcc-7.0, clang-7) |ImageLink|_
• OSX (Apple Clang - LLVM 3.6) |ImageLink|_

.. |ImageLink| image:: https://travis-ci.org/paceholder/nodeeditor.svg?branch=master .. _ImageLink: https://travis-ci.org/paceholder/nodeeditor

• Windows (Win32, x64, msvc2017, MinGW 5.3) |AppveyorImage|_

.. |AppveyorImage| image:: https://ci.appveyor.com/api/projects/status/wxp47wv3uyyiujjw/branch/master?svg=true .. _AppveyorImage: https://ci.appveyor.com/project/paceholder/nodeeditor/branch/master)

Dependencies

• Qt >5.15
• CMake 3.8
• Catch2

Current State (v3)

• Model-based graph
• Headless mode You can create, populate, modify the derivative of
  AbstractGraphModel
  without adding it to the actual Flow Scene. The library is now designed to be general-purpose graph visualization and modification tool, without specialization on only data propagation.
• Automatic data propagation built on top of the graph-model code The library could be used for both pure graph visualization purposes and for originally implemented data propagation.
• Dynamic ports
• Datatype-aware connections
• Embedded Qt widgets
• One-output to many-input connections
• JSON-based interface styles
• Saving scenes to JSON files
• Custom Node Geometry
• Vertical and Horizontal graph layouts
• Undo/Redo, Duplication (CTRL+D)

Building

Linux

::

git clone git@github.com:paceholder/nodeeditor.git cd nodeeditor mkdir build cd build cmake .. make -j && make install

Qt Creator

1. Open
   CMakeLists.txt
   as project.
2. If you don't have the
   Catch2
   library installed, go to
   Build Settings
   , disable the checkbox
   BUILD_TESTING
   .
3. Build -> Run CMake
4. Build -> Build All
5. Click the button
   Run

With Cmake using

^^^^^^^^^^^^^^^^^^^^^^^^

1. Install
   vcpkg
2. Add the following flag in configuration step of
   CMake

::

-DCMAKE_TOOLCHAIN_FILE=<vcpkg_dir>/scripts/buildsystems/scripts/buildsystems/vcpkg.cmake

Help Needed

#. Python wrappring using PySide. #. QML frontend. #. Wirting a ClangFormat config.

Any suggestions are welcome!

Contribution

#. Be polite, respectful and collaborative. #. For submitting a bug:

#. Describe your environment (Qt version, compiler, OS etc) #. Describe steps to reproduce the issue

#. For submitting a pull request:

#. Create a proposal task first. We can come up with a better design together. #. Create a pull-request. If applicable, create a simple example for your problem, describe the changes in details, provide use cases.

#. For submitting a development request:

#. Describe your issue in details #. Provide some use cases.

#. I maintain this probject in my free time, when I am not busy with my work or my family. If I do not react or do not answer for too long, please ping me.

Citing

::

Dmitry Pinaev et al, Qt Nodes, (2022), GitHub repository, https://github.com/paceholder/nodeeditor

BibTeX::

@misc{Pinaev2022,
  author = {Dmitry Pinaev et al},
  title = {QtNodes. Node Editor},
  year = {2017},
  publisher = {GitHub},
  journal = {GitHub repository},
  howpublished = {\url{https://github.com/paceholder/nodeeditor}},
  commit = {877ddb8c447a7a061a5022e9956a3194132e3dd9}
}

Support

If you like the project you could donate me on PayPal |ImagePaypal|_

.. |ImagePaypal| image:: https://img.shields.io/badge/Donate-PayPal-green.svg .. _ImagePaypal: https://www.paypal.com/paypalme/DmitryPinaev

If you send more than $100, I'll forward $100 to some fund supporting sick children and report to you back.

Thanks

The version 3 was released with a generous help of

_

Showcase

Youtube videos

.. image:: https://img.youtube.com/vi/pxMXjSvlOFw/0.jpg :target: https://www.youtube.com/watch?v=pxMXjSvlOFw

|

.. image:: https://img.youtube.com/vi/i_pB-Y0hCYQ/0.jpg :target: https://www.youtube.com/watch?v=i_pB-Y0hCYQ

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