Comment by tunesmith

It looks like it is more canvas than svg, yes? Was there a particular canvas library that you used? I ask because I'm working on a side project that feels like it mostly pulls me in an svg direction, so I'm been prototyping with dagrejs and cytoscape.js, but it also has elements of creating (or dragging, like yours) new elements into a graph and connecting them, so I'm regularly torn when deciding on the basic architecture of it.