[Vala] Flowgraphs for Gtk in Vala

[Daniel Brendle <grindhold skarphed org>]

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Hi there!

I wanted to introduce you to a project that has been on my
"to-do"-stack for a long time. Now it grew to be somewhat presentable.
Meet our very own Blender-Node-Editor-like flowgraph library for Gtk3:

https://github.com/grindhold/libgtkflow

GtkFlow gives you a new Widget, the GtkFlow.NodeView you can add nodes
to this view that have inputs and outputs (so called sinks and sources
respectively). These Nodes and the connections between them can be
arranged by the user by dragging and dropping.
It provides an easy way for users to communicate to a program how
things interact and how things are connected.

If you develop UI (especially for GNOME-related stuff), please let
yourself be inspired how Flowgraphs could enhance your UI-concept.
Some usecases i thought about are:
  - A GUI for GStreamer that you can build and export your GStreamer
pipelines from/to
  - UI Replacement for GNURadio's Flowgraph implementation
  - Video Compositing for PiTiVi

I am eager to hear about your thoughts of possible usecases and
especially for feedback about the library itself.

If anyone can use it, i'd also be happy about helpers that engage in
pushing the project further.


Yours, Grindhold

[I posted the same email to gtk-list gnome org . If this is not
acceptable, please tell me. I won't do it again]
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