D3 tree service module

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The D3 tree module uses the D3 partition layout to visualize hierarchial topic structures in Wandora. It uses the open source JavaScript visualization library D3.js. The service module's alias in Wandora is d3tree and the URL of the visualization is

The visualization facilitates different hierarchies with HTTP parameters used to specify the hierarchy's root topic, child-parent-association and respective child and parent roles in the association. By default the depth of recursion through the hierarchy is limited to 5 recursions but may also be overridden with a HTTP parameter.

A complete description of the parameters is provided on the visualization page and an example of their use follows below.

Note that as with D3 the browser support of D3 visualizations in Wandora is limited to IE9+ and up to date versions of Firefox, Chrome (+Chromium), Safari and Opera.

By default the visualization shows a hierarchy where Wandora Class is the root topic, the parent role is superclass and the child role subclass in the superclass-subclass association. No topics need to be added to Wandora to view this hierarchy since the aforementioned topics are added to Wandora on startup.

D3 tree 01.png

A larger set of topics shown here is achieved by using the Tree graph generator and specifying the following query string.


D3 tree 02.png

In a more complex example a data from the European royal families topicmap is used. A Query topic map that creates child-parent associations has been added to the layer structure in the project file in order to visualize hierarchial family relations.

D3 tree 03.png

The following query string is used to visualize four generations of George I's descendants


D3 tree 04.png

Reversing the child and parent roles and icreasing depth we get in turn 7 generations of George I's ancestors

D3 tree 05.png
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