lukoerfer / welkin Goto Github PK
View Code? Open in Web Editor NEWFork of the abandoned graph-based RDF visualizer Welkin
License: Other
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Improve graph layout algorithm
Graph layout algorithm is a brute force n-body, with algorithmical complexity of O(n^2), with n the number of nodes. There are algorithms that achieve at least O(n*log(n)) complexity, but they require a b-tree creation. We need to investigate at how many nodes the nlog(n) algorithm starts to make sense and whether or not this is actually useful in real life due to data pollution.
This issue was generated by todo based on a todo comment in dbd2586.
Support loading from URL
Fragmentation of long literals
Improve focus / zooming
Fish-eye focusing looks sexy but might not be that effective in real life, maybe semantic zooming/panning would be more helpful? Or combining the approaches? In case, when doing the fisheye zoom, we should make sure that things don't fall off the edge of the graph and get cropped.
This issue was generated by todo based on a todo comment in dbd2586.
Type filter
Provenance info in graph model
Prevent / warn user from loading too much data
There is no usability degradation control: Welkin will not stop users from loading an excessive amount of information that would make the system too slow to be responsive. We must think about ways to prevent this from happening as usability should always be good.
This issue was generated by todo based on a todo comment in dbd2586.
Improve color selection
Hue color sliders are lame, we need to find a better method for color coding that would make it easier for users to select colors that have a cognitively similar level of contrast (see the NASA usability lab color tool for an example of that).
This issue was generated by todo based on a todo comment in dbd2586.
Clustering algorithms
Play with clustering algorithms as a way to simplify the graph when it contains too many nodes (Newmann-Girman is very promising, but it's algorithmical complexity may be somewhat limiting and clearly not realtime, but maybe we can reuse some of the force-repulsion simulation to perform the clustering incrementally).
This issue was generated by todo based on a todo comment in dbd2586.
Support model / layout saving
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