How to flexibly select a region with nodes with d3

Question

The brush function in d3 is great and simple to use. However, for a complex graph like a force-directed tree and scatter plot graph, more flexible selection of nodes may be necessary to understand the property of a particular region.

Is there any way to implement such kind of selection in D3?

Answer 1

There is a D3 plugin called lasso.js which seems to provide the functionality you are looking for. The example looks like the graphic you attached to your post.

Another one worth a look is the Polybrush plugin which provides a polygon selection. This, however, might be to restrictive for your needs.