Hi,
We are happy to announce GT Mondrian, a graph visualization engine built on top
of Bloc.
It is similar to the original Mondrian and the Mondrian from Roassal, but it is
different in that it is built directly out of Bloc elements. This is
interesting because it allows us to combine typical widgets with
visualizations. The other interesting thing about it is that it validates the
design of Bloc: right now, the implementation has 509 lines of code (excluding
graph-specific layouts). The goal is to make visualization a first class
citizen and an integral part of the IDE.
The key ingredient that made this happen is that Bloc can now treat graph
layouts, such as tree or force based, behave under the same rules as typical
widget layouts, such as grid or flow. The challenge comes from the fact that a
graph layout depends on the notion of edges between elements, and we did not
want to have elements know about edges in the core of Bloc.
The solution was to split the typical edge implementation in graph
visualization libraries into two distinct concepts:
• Line is an element that draws the connections.
• Edge defines constraints imposed by connections between elements.
Thus, edges form constraints, and constraints are what layouts deal with. That
is one reason why elements in bloc have the ability of defining layout-specific
constraints. Using this, we can nicely define edges between elements as a
plugin to Bloc, but still be able to connect arbitrary elements. What's more,
it turns out that we need constraints for other layouts as well. For example,
an element in a grid layout might specify the span.
The API of GT Mondrian is similar to the one from Roassal, but there are a few
differences as well. These are described in the Pillar documentation available
in the GitHub repo.
The best way to experience GT Mondrian and its documentation is to load the
GToolkit as described here:
https://github.com/feenkcom/gtoolkit
If you download the GT code through Iceberg, the documentation can be
experienced live by inspecting:
'./pharo-local/iceberg/feenkcom/gtoolkit-visualizer/doc/mondrian/index.pillar'
asFileReference
Cheers,
The feenk team
--
www.tudorgirba.com
www.feenk.com
"Quality cannot be an afterthought."
